CATEGORY RECOMMENDATION
PISTON BX7655 FORGED TOMEI PISTONS
BX8260
The stock pistons can withstand up to around 500ps. However, using the 7655 & 8260 turbo at 1.6kg /cm² (22.8psi) boost can cause the pistons to melt and/or the compression to drop. Thus for high boost settings, forged pistons should be installed in conjunction with a high performance head gasket.
CONNECTING RODS BX7655 RECOMMENDED: TOMEI
H-Beam Connecting Rods
BX8260
The stock connecting rods can withstand up to around 500ps. However, high performance connecting rods are recommended for higher power outputs.
BOOST SETTING BX7655 1.6kg/cm²(22.8psi) with a boost controller
BX8260
The ARMS 7960 and 8260 turbos are capable of producing 580PS and 650PS respectively at 1.6 kg /cm² (22.8psi) boost. At these settings, the stock gaskets and engine internals become it is highly recommended for the head gasket to be upgraded at the very least (MAX 500ps with 7655 at 1.1~1.2kg/cm²(15.6~17.1psi) boost). With forged pistons and depending upon the vehicle, 1.5~1.6kg/cm²(21.3~22.8psi) is possible. Ensure boost settings are adjusted with the car in 4th/5th gear and not at lower gears. At lower gears there is significantly less load, resulting in incorrect boost settings. (At higher RPMs, beyond peak boost, it is common for the boost drop/tail-off)
POWER BX7655 580ps
BX8260 650ps
BX7655 The stock engine can produce up to around 500PS at 1.1~1.2kg/cm² (15.6~17.1psi) of boost. The head gasket will have to be upgraded to a metal type for this to be possible. If the pistons are also upgraded (to forged pistons), the boost can be increased up to 1.6kg/cm² for more power gains.
BX8260 This turbocharger is optimized for tuned engines. Accordingly, it is not recommended for installation on a stock engine as the internals may not be able to withstand the significantly increased load/power potential.
CAMSHAFTS BX7655 TOMEI PONCAM type-B
BX8260 TOMEI PROCAM 270°-10.25mm
The standard camshafts aren’t capable of providing the required exhaust pressure to maximize the performance gains from the bigger turbo. Therefore, upgrading the camshafts is highly recommended.
HEAD GASKET BX7655 UPGRADE TO METAL TYPE Recommended: TOMEI Metal Gasket Combination
BX8260
Increasing boost will naturally increase combustion pressure. To maintain a secure seal at high boost is it strongly recommended that you upgrade to a high performance head gasket with superior sealing. Changing head gaskets will also allow you to adjust the compression ratio. RB26 engines have been known to have weak/think gaskets on the throttle as well as on the intake and exhausts manifolds. These should also be upgraded at the same time.
INJECTOR CAPACITY BX7655 600cc or larger
BX8260 700cc or larger
Target horse power×5.9÷No. of cylinders required injector capacity per cylinder. Injectors should be operating at around 80`90% capacity to maintain good fuel atomization.
FUEL PUMP CAPACITY BX7655 240L/h or larger (@ 3kg/cm²)F
BX8260
Injector capacity×No. of cylinders×0.06 required fuel pump capacity Fuel pumps should be operating at around 80`90% capacity to maintain good fuel flow
FUEL PRESSURE REGULATOR BX7655 Adjustable type, TOMEI TYPE-S
BX8260 Adjustable type, TOMEI@TYPE-L
Fuel pressure should be adjusted according to the fuel pump. Initial/atmospheric pressure should be set to 3kg/cm2.
AIR CLEANER BX7655 High efficiency type
BX8260
Bolt-on replacement upgrade recommended if retaining MAF sensor
MAF BX7655 NISMO MAF or MAF DELETE
BX8260 MAF delete
Around 450ps-480ps is the maximum for a stock MAF. NISMO MAFs can handle upto around 700ps.
SUCTION PIPE BX7655 High efficiency type
BX8260
Upgrading the suction pipe significantly improves air flow efficiency compared to the stock suction pipe which can sometimes warp during high boost.
INTERCOOLER BX7655 High flow type
BX8260
In general, pressurized air from the turbo is compressed and forced into the engine. However, the air from the has low oxygen content (low density) as the air is hot and expanded. This has an adverse effect on combustion efficiency and subsequently on performance. By installing an intercooler between the turbo and the engine, it allows the compressed air to be cooled before it enters the combustion chamber. This results in improved engine performance as the colder denser air improves combustion efficiency.
BLOW-OFF VALVE BX7655 High performance type (not vent to atmosphere)
BX8260
When the throttle closes, the pressurized air from the turbo has no where to go and is forced back towards the turbo. This puts significant stress on the compressor wheel and in some instances can be enough to stall it all together. To prevent this, a blow-off valve is installed between the turbo and throttle to recirculate the air to between the MAF and turbo. However, using a stock blow off valve for high boost setups will cause it to relief the boost prematurely, resulting in reduced response and power. Therefore it is highly recommended that you upgrade the blow-off valve to a high performance unit. It should be noted that whilst both vent-to-atmosphere type and recirculation type blow-off valve setups serve the same function of relieving boost, the former will often cause the MAF to give false readings. For this reason it is recommended that you recirculate the excess boost.
EXHAUST MANIFOLD BX7655 TOMEI@EXPREME or similar
BX8260
By upgrading your camshafts, you can increase the exhaust pressure. To take advantage of this replacing the manifold is highly recommended. This will help spool the turbos more efficiently for a smoother and more responsive boost
TURBO OUTLET BX7655 TOMEI@EXPREME or similar
BX8260
The stock outlet pipes have a restricted flow. In particular, at higher engine speeds (RPM), the narrower stock outlet pipes cause the exhaust gasses to build up within them, leading to unstable boost. With the larger outlet pipes, exhaust gasses can flow more efficiently, stabilizing boost and improving the overall response of the turbo
FRONT PIPE BX7655 TOMEI@EXPREME Ti or similar
BX8260
As with the outlet, smooth air flow will improve the response, leading to better performance .overall
CATALYTIC CONVERTER BX7655 Metal catalytic converter
BX8260
This allow for high exhaust flow efficiency whilst still being able to reduce emissions.
EXHAUST BX7655 Around Φ80mm main pipe diameter
BX8260
As with the outlet, smooth air flow will improve response and performance.
ECU BX7655 To suit the car's setup requirements.
BX8260
The ECU will need to be remapped after installation to suit the vehicles specifications/intended use.
SPARK PLUG MX7655 No. 8 / 9 or similar
MX8260
The increase in power also means an increase combustion temperature. This can cause the stock spark plugs to melt. Heat range 8 or 9 spark plugs are generally recommended, although you should conduct an individual inspection to determine the best type for your vehicle.
 
CATEGORY RECOMMENDATION
BOOST SETTING STOCK ENGINE 1.0~1.2kgf/cm²(14.2~17.1psi) with boost controller
UPGRADED
PISTONS ETC.
1.6kgf/cm²(22.8psi) with boost controller
POWER STOCK ENGINE 350~370ps
UPGRADED
PISTONS ETC.
450ps
CAMSHAFTS STOCK ENGINE Stock / longer duration Recommended: TOMEI PONCAM
UPGRADED
PISTONS ETC.
Longer duration cams required Recommended: TOMEI PONCAM
HEAD GASKET STOCK ENGINE High performance, metal type Recommended: TOMEI METAL HEAD GASKET
UPGRADED
PISTONS ETC.
FUEL PUMP STOCK ENGINE 240L/h or larger
Injector capacity x No. of cylinders x0.06=required fuel pump capacity.
UPGRADED
PISTONS ETC.
INJECTOR CAPACITY STOCK ENGINE 550cc or larger
Target horse power x 5.9÷No. of cylinders=required injector capacity
UPGRADED
PISTONS ETC.
FUEL PRESSURE REGULATOR STOCK ENGINE Adjustable type
Recommended: TOMEI TYPE-S
UPGRADED
PISTONS ETC.
AIR CLEANER STOCK ENGINE High flow type
UPGRADED
PISTONS ETC.
SUCTION PIPE STOCK ENGINE Stock or high flow type
UPGRADED
PISTONS ETC.
High flow type
INTERCOOLER STOCK ENGINE Stock or high flow type
UPGRADED
PISTONS ETC.
High flow type
EXHAUST MANIFOLD STOCK ENGINE Stock
UPGRADED
PISTONS ETC.
Stock or high flow type
OUTLET/FRONT PIPE STOCK ENGINE Stock or high flow type Recommended: TOMEI EXPREME
UPGRADED
PISTONS ETC.
High flow type Recommended: TOMEI EXPREME
CATALYTIC CONVERTER STOCK ENGINE Stock or high flow type
UPGRADED
PISTONS ETC.
EXHAUST STOCK ENGINE Around Φ80-Φ90 main section
UPGRADED
PISTONS ETC.
ECU STOCK ENGINE Vehicle/setup specific
UPGRADED
PISTONS ETC.
BLOW-OFF VALVE STOCK ENGINE High performance type, not vent to atmosphere
UPGRADED
PISTONS ETC.
SPARK PLUG STOCK ENGINE No. 8 / 9 or similar
UPGRADED
PISTONS ETC.
 
CATEGORY RECOMMENDATION
BOOST SETTING BX7960 1.6kg/cm²(22.8psijwith boost controller
BX8270
The 7960 / 8270 turbo is capable of making over 400ps / 450ps respectively @ 1.6kg/cm²(22.8psi) boost. For a stock engine, it is recommended that you at least upgrade the head gasket to a metal type. With the stock setup the engine should be able to withstand up to around 330ps @ 1.0`1.1kg/cm² (14.2`15.6psijboost. With the upgraded gasket, 1.3kg/cm²i18.49psijboost is possible and with forged pistons, 1.5`1.6kg/cm2 i21.3`22.8psijcan be achieved. Note that boost settings should be made in 4th/5th gear. Configuring boost in lower gears will result in higher actual boost as load is significantly greater at higher gears. (You may notice that boost begins to fall as you raise the rpm beyond peak boost. This is normal)
POWER BX7960 400`420ps
BX8270 400`420ps
For a stock engine, around 300`330ps is the maximum it can withstand. Accordingly boost should be limited to around 1.1`1.2k.
PISTONS BX7960 FORGED TOMEI PISTONS
BX8270
Stock SR20 pistons can withstand up to around 330ps. However, the 7960 / 8270 turbo @ 1.6kg/cm²(22.8psi) boost significantly increases combustion pressure which can cause the stock pistons to melt. Therefore, It is highly recommended that you upgrade to forged pistons for high boost setups. The head gasket should also be upgraded at the same time. (The life span of an SR20 engine running stock pistons @ 1.3kg/cm² (18.49psi) boost is said to be around 1 year.)
HEAD GASKET BX7960 TOMEI METAL HEAD GASKET
BX8270
Increasing boost will naturally increase combustion pressure. To maintain a secure seal at high boost is it strongly recommended that you upgrade to a high performance head gasket with superior sealing. Changing head gaskets will also allow you to adjust the compression ratio.
INJECTOR CAPACITY BX7960 More than 680cc
BX8270
Target horse power×5.9÷No. of cylinders required injector capacity per cylinder. Injectors should be operating at around 80`90% capacity to maintain good fuel atomization.
FUEL PUMP CAPACITY BX7960 More than 178L/h
BX8270
Injector capacity×No. of cylinders×0.06 required fuel pump capacity Fuel pumps should be operating at around 80`90 capacity to maintain good fuel flow.
FUEL PRESSURE REGULATOR BX7960 Adjustable type: TOMEI TYPE-S or similar
BX8270
Fuel pressure should be adjusted according to the fuel pump. Initial/atmospheric pressure should be set to 3kg/cm2.
AIR CLEANER BX7960 High flow type
BX8270
Bolt-on replacement upgrade recommended if retaining MAF sensor.
MAF BX7960 Stock Z32 or without TOMEI MAF KIT or MAF delete intake kit
BX8270
The stock Airflow diameter is too small and restrictive. A common upgrade is the Nissan Z32 Airflow meter. With the Z32 AFM it is possible to reach 450ps however a MAF delete setup is setup is recommended for higher power setups.
SUCTION PIPE BX7960 High Flow Type
BX8270
If you run high boost with the stock suction pipe, deformation of the pipe can occur and cause unwanted flow restrictions. Replacing this will improve air flow.
INTERCOOLER MX7655 Large Capacity and High Flow Type
MX8260
Compressed and pressurized air from the turbo is sent to the engine. As is, this air is warm/hot resulting in reduced air density and combustion efficiency which in turn leads to a decrease in performance. The intercooler sits between the turbo and the engine, dissipating the heat from the pressurized air. This cooler air is significantly denser, improving combustion efficiency and performance.
BLOW-OFF VALVE MX7655 Non Vent to Atmosphere Type. S14/15 Recirculation Intake Relief recommended
MX8260
When the Blow Off Valve relieves pressure by venting to the atmosphere, the turbo will work the same as the re-circulation method. But when the throttle is suddenly closed, air will still continue to flow through the AFM which will confuse the ECU to allow more fuel to be injected into the engine even when there is insufficient air flowing into the engine. This will cause the mixture to run rich and cause the engine to stall. This fouls the plugs and drops engine performance. So when using a blow off valve that re-circulates like standard, this eliminates the problem and allows the ECU to accurately control the correct air/fuel mixture at all times. The S14/15 comes with the Re-circulation Valve for intake relief function. This is when the pressure is higher than the supercharger, and so it acts as a safety device to allow the excess pressure to vent back into the intake system. This usually happens when the excess pressure reaches 0.1` 0.4kg/cm².
EXHAUST MANIFOLD MX7655 TOMEI@EXPREME or similar
MX8260
By upgrading your camshafts, you can increase the exhaust pressure. To take advantage of this replacing the manifold is highly recommended. This will help spool the turbos more efficiently for a smoother and more responsive boost
TURBO OUTLET MX7655 TOMEI@EXPREME or similar
MX8260
The stock outlet pipes have a restricted flow. In particular, at higher engine speeds (RPM), the narrower stock outlet pipes cause the exhaust gasses to build up within them, leading to unstable boost. With the larger outlet pipes, exhaust gasses can flow more efficiently, stabilizing boost and improving the overall response of the turbo.
FRONT PIPE MX7655 TOMEI@EXPREME or similar
MX8260
As with the outlet, smooth air flow will improve the response pickup, leading to better performance overall
CATALYTIC CONVERTER MX7655 Metal catalytic converter
MX8260
This allow high exhaust flow efficiency whilst still being able to reduce emissions.
EXHAUST MX7655 Φ80mm main pipe diameter
MX8260
As with the outlet, smooth air flow will improve response pickup and performance gains.
ECU MX7655 To suit the car's setup requirements.
MX8260
The ECU will need to be remapped after installation to suit the vehicles specifications/intended use
SPARK PLUG MX7655 No. 8 / 9 or similar
MX8260
The increase in power also means an increase combustion temperature. This can cause the stock spark plugs to melt. Heat range 8 or 9 spark plugs are generally recommended, although you should conduct an individual inspection to determine the best type for your vehicle.
 
CATEGORY RECOMMENDATION
BOOST SETTING BX7960 1.6kg/cm²(22.8psijwith boost controller
BX8270
The 7960 / 8270 turbo is capable of making over 400ps / 450ps respectively @ 1.6kg/cm²(22.8psi) boost. For a stock engine, it is recommended that you at least upgrade the head gasket to a metal type. With the stock setup the engine should be able to withstand up to around 330ps @ 1.0`1.1kg/cm² (14.2`15.6psijboost. With the upgraded gasket, 1.3kg/cm²i18.49psijboost is possible and with forged pistons, 1.5`1.6kg/cm2 i21.3`22.8psijcan be achieved. Note that boost settings should be made in 4th/5th gear. Configuring boost in lower gears will result in higher actual boost as load is significantly greater at higher gears. (You may notice that boost begins to fall as you raise the rpm beyond peak boost. This is normal)
POWER BX7960 400`420ps
BX8270 400`420ps
For a stock engine, around 300`330ps is the maximum it can withstand. Accordingly boost should be limited to around 1.1`1.2k.
PISTONS BX7960 FORGED TOMEI PISTONS
BX8270
Stock SR20 pistons can withstand up to around 330ps. However, the 7960 / 8270 turbo @ 1.6kg/cm²(22.8psi) boost significantly increases combustion pressure which can cause the stock pistons to melt. Therefore, It is highly recommended that you upgrade to forged pistons for high boost setups. The head gasket should also be upgraded at the same time. (The life span of an SR20 engine running stock pistons @ 1.3kg/cm² (18.49psi) boost is said to be around 1 year.)
HEAD GASKET BX7960 TOMEI METAL HEAD GASKET
BX8270
Increasing boost will naturally increase combustion pressure. To maintain a secure seal at high boost is it strongly recommended that you upgrade to a high performance head gasket with superior sealing. Changing head gaskets will also allow you to adjust the compression ratio.
INJECTOR CAPACITY BX7960 More than 680cc,
BX8270
Target horse power×5.9÷No. of cylinders required injector capacity per cylinder. Injectors should be operating at around 80`90% capacity to maintain good fuel atomization.
FUEL PUMP CAPACITY BX7960 More than 178L/h
BX8270
Injector capacity×No. of cylinders×0.06 required fuel pump capacity Fuel pumps should be operating at around 80`90 capacity to maintain good fuel flow.
FUEL PRESSURE REGULATOR BX7960 Adjustable type: TOMEI TYPE-S or similar
BX8270
Fuel pressure should be adjusted according to the fuel pump. Initial/atmospheric pressure should be set to 3kg/cm2.
AIR CLEANER BX7960 High flow type
BX8270
Bolt-on replacement upgrade recommended if retaining MAF sensor.
MAF BX7960 Stock Z32 or without TOMEI MAF KIT or MAF delete intake kit
BX8270
The stock Airflow diameter is too small and restrictive. A common upgrade is the Nissan Z32 Airflow meter. With the Z32 AFM it is possible to reach 450ps however a MAF delete setup is setup is recommended for higher power setups.
SUCTION PIPE BX7960 High Flow Type
BX8270
If you run high boost with the stock suction pipe, deformation of the pipe can occur and cause unwanted flow restrictions. Replacing this will improve air flow.
INTERCOOLER MX7655 Large Capacity and High Flow Type
MX8260
Compressed and pressurized air from the turbo is sent to the engine. As is, this air is warm/hot resulting in reduced air density and combustion efficiency which in turn leads to a decrease in performance. The intercooler sits between the turbo and the engine, dissipating the heat from the pressurized air. This cooler air is significantly denser, improving combustion efficiency and performance.
BLOW-OFF VALVE MX7655 Non Vent to Atmosphere Type. S14/15 Recirculation Intake Relief recommended
MX8260
When the Blow Off Valve relieves pressure by venting to the atmosphere, the turbo will work the same as the re-circulation method. But when the throttle is suddenly closed, air will still continue to flow through the AFM which will confuse the ECU to allow more fuel to be injected into the engine even when there is insufficient air flowing into the engine. This will cause the mixture to run rich and cause the engine to stall. This fouls the plugs and drops engine performance. So when using a blow off valve that re-circulates like standard, this eliminates the problem and allows the ECU to accurately control the correct air/fuel mixture at all times. The S14/15 comes with the Re-circulation Valve for intake relief function. This is when the pressure is higher than the supercharger, and so it acts as a safety device to allow the excess pressure to vent back into the intake system. This usually happens when the excess pressure reaches 0.1` 0.4kg/cm².
EXHAUST MANIFOLD MX7655 TOMEI@EXPREME or similar
MX8260
By upgrading your camshafts, you can increase the exhaust pressure. To take advantage of this replacing the manifold is highly recommended. This will help spool the turbos more efficiently for a smoother and more responsive boost
TURBO OUTLET MX7655 TOMEI@EXPREME or similar
MX8260
The stock outlet pipes have a restricted flow. In particular, at higher engine speeds (RPM), the narrower stock outlet pipes cause the exhaust gasses to build up within them, leading to unstable boost. With the larger outlet pipes, exhaust gasses can flow more efficiently, stabilizing boost and improving the overall response of the turbo.
FRONT PIPE MX7655 TOMEI@EXPREME or similar
MX8260
As with the outlet, smooth air flow will improve the response pickup, leading to better performance overall
CATALYTIC CONVERTER MX7655 Metal catalytic converter
MX8260
This allow high exhaust flow efficiency whilst still being able to reduce emissions.
EXHAUST MX7655 Φ80mm main pipe diameter
MX8260
As with the outlet, smooth air flow will improve response pickup and performance gains.
ECU MX7655 To suit the car's setup requirements.
MX8260
The ECU will need to be remapped after installation to suit the vehicles specifications/intended use
SPARK PLUG MX7655 No. 8 / 9 or similar
MX8260
The increase in power also means an increase combustion temperature. This can cause the stock spark plugs to melt. Heat range 8 or 9 spark plugs are generally recommended, although you should conduct an individual inspection to determine the best type for your vehicle.
 
CATEGORY RECOMMENDATION
BOOST SETTING STD 1.0`1.2kg/cm²(14.2`17.1psijwith boost controller
TUNED 1.6kg/cm²(22.8psijwith boost controller
This turbocharger is capable of making over 450ps @ 1.6kg/cm²i22.8psijboost. However, actual results will vary depending on the condition of the vehicle. Note that boost settings should be made in 4th/5th gear. Configuring boost in lower gears will result in higher actual boost as load is significantly greater at higher gears. (You may notice that boost begins to fall as you raise the rpm beyond peak boost. This is normal)
POWER STD 350ps
TUNED 450ps
Camshafts, turbo suction pipe, exhaust manifold, turbo outlet, catalytic converters as well as exhaust systems can all impact performance. With stock camshafts, exhaust manifold and turbo outlet around 350ps is achievable @ 1.2kg/cm²i17.1psij boost. Upgrading all the above should make around 450ps @ 1.6kg/cm²(22.8psi) boost.
PISTONS STD Stock
TUNED
Stock 1JZ pistons can withstand up to around 600ps provided the engine is healthy. However, upgrading to forged pistons is highly recommended for engines with compression loss and/or other issues.
CONNECTING RODS STD Stock
TUNED TOMEI H-BEAM CONNECTING RODS
Stock 1JZ connecting rods can withstand up to around 500ps. Beyond this, it is highly recommended that you upgrade the connecting rods.
CAMSHAFTS STD Stock
TUNED TOMEI PONCAM or similar
Stock camshafts are incapable of generating the exhaust pressure needed to take advantage of the larger turbo. Upgrading the camshafts will allow you to maximize the potential of the turbo.
HEAD GASKET STD Stock
TUNED TOMEI METAL HEAD GASKET or similar
Increasing the boost will also increase the combustion pressure. It's possible to increase the boost up to around 1.6kg/cm²i22.8psijeven with a stock head gasket. However, lowing the compression ratio will allow you to fine tune the engine. To maintain a secure seal at high boost is it strongly recommended that you upgrade to a high performance head gasket with superior sealing. Gasket thickness should be selected based on the desired compression ratio. For reference, TOMEI φ87.5-1.8o8.8:1 CR, φ87.5-2.0o8.:1 CR6 however actual figures will depend on the amount of resurfacing/head work that has been undertaken
INJECTOR CAPACITY STD More than 550cc
TUNED
Target horse power×5.9÷No. of cylinders required injector capacity per cylinder. Injectors should be operating at around 80`90% capacity to maintain good fuel atomization.
FUEL PUMP CAPACITY STD More than 240L/h(3kg/cm² fuel pressure)
TUNED
Injector capacity×No. of cylinders×0.06 required fuel pump capacity Fuel pumps should be operating at around 80`90 capacity to maintain good fuel flow
FUEL PRESSURE REGULATOR STD Adjustable type: TOMEI TYPE-S or similar
TUNED
Fuel pressure should be adjusted according to the fuel pump. Initial/atmospheric pressure should be set to 3kg/cm2.
AIR CLEANER STD High flow type
TUNED
The air cleaner/filter should be upgraded to suit the power output of the engine.
MAF STD Either with or without stock MAF
TUNED
500ps is the maximum for a stock MAF.
SUCTION PIPE BX7960 Stock or bolt-on upgrade
BX8270 Straight type
Upgrading the suction pipe significantly improves air flow efficiency compared to the stock suction pipe which can sometimes warp during high boost. However, using a straight type suction pipe while retaining the MAF sensor may cause rough idling and/or more frequent stalling.
INTERCOOLER MX7655 Something better than bolt-on upgrade
MX8260 High capacity, high efficiency type
In general, pressurized air from the turbo is compressed and forced into the engine. However, the air from the has low oxygen content (low density) as the air is hot and expanded. This has an adverse effect on combustion efficiency and subsequently on performance. By installing an intercooler between the turbo and the engine, it allows the compressed air to be cooled before it enters the combustion chamber. This results in improved engine performance as the colder denser air improves combustion efficiency.
BLOW-OFF VALVE MX7655 High performance type
(not vent to atmosphere)
MX8260
When the throttle closes, the pressurized air from the turbo has no where to go and is forced back towards the turbo. This puts significant stress on the compressor wheel and in some instances can be enough to stall it all together. To prevent this, a blow-off valve is installed between the turbo and throttle to recirculate the air to between the MAF and turbo. However, using a stock blow off valve for high boost setups will cause it to relief the boost prematurely, resulting in reduced response and power. Therefore it is highly recommended that you upgrade the blow-off valve to a high performance unit. It should be noted that whilst both vent-to-atmosphere type and recirculation type blow-off valve setups serve the same function of relieving boost, the former will often cause the MAF to give false readings. For this reason it is recommended that you recirculate the excess boost.
EXHAUST MANIFOLD MX7655 Stock
MX8260 High flow, high efficiency type
With the increased exhaust pressure from upgrading the camshafts, a high flow exhaust manifold is needed to efficiently route the exhaust gases to the turbine wheel. This helps improve turbo spool and performance.
TURBO OUTLET MX7655 Stock
MX8260 High flow, high efficiency type around 76.3mm I.D
The stock turbo outlet isn't capable of expunging the exhaust gasses efficiently. Especially at high rpms with higher boost, the confined exhaust gasses are unable to flow efficiently through the turbo, causing unstable boost. Upgrading the turbo outlet to one with a larger opening helps solve this issue, providing improved turbo spool and stable boost.
FRONT PIPE MX7655 Around φ76.3
MX8260
Similar to the turbo outlet, upgrading the front pipe improves performance in both the mid range and top end.
CATALYTIC CONVERTER MX7655 Metal type
MX8260
Upgrading to a metal catalytic converter greatly reduces exhaust flow resistance whist maintaining it's core function of reducing toxic gasses.
EXHAUST MX7655 Around φ80`90
MX8260
Similar to the turbo outlet, upgrading the exhaust improves performance in both the mid range and top end
ECU MX7655 Vehicle/setup specific
MX8260
The ECU should be adjusted to suit the vehicle/setup.
SPARK PLUG MX7655 No. 8 / 9 or similar
MX8260
As the power increases, so does the combustion temperature. Using spark plugs of the same heat rating as stock may cause them to melt. To avoid this, it is recommended that you use No. 8 / 9 spark plus. However, ensure you check the spark plug tips to determine the best solution. spark plugs to melt. Heat range 8 or 9 spark plugs are generally recommended, although you should conduct an individual inspection to determine the best type for your vehicle.
 
CATEGORY RECOMMENDATION
BOOST SETTING   STOCK ENGINE TUNED ENGINE
(e.g. 2.2/2.5l stroker)
BX7760 1.4~1.5kg/cm2 (19.9~21.3psi) 1.6kg/cm2 (22.8psi)
BX7960(F) with boost controller
BX8265 - -
Rated power at 1.6kg/cm2 (22.8psi) boost; BX7760F380ps, BX7960(F)F400ps, BX8265F450ps For a stock engine, it is recommended that you at least upgrade the head gasket to a metal type. With this setup the engine should be able to withstand up to around 350ps with the BX7760/BX7960(F). Accordingly, the boost should be limited to around1.4~1.5kg/cm2 (19.9~21.3psi). Upgrading to forged pistons and H-Beam connecting rods should allow you to safely raise the boost to 1.6kg/cm2 (22.8psi). However, this will depend on the specifications/condition of the vehicle. Note that boost settings should be made in 4th/5th gear. Configuring boost in lower gears will result in higher actual boost as load is significantly greater at higher gears. (You may notice that boost begins to fall as you raise the rpm beyond peak boost. This is normal)
POWER   STOCK ENGINE TUNED ENGINE
(e.g. 2.2/2.5l stroker)
BX7760 350PS 380PS
BX7960(F) 350PS 400PS
BX8265 - 450PS
BX7760
BX7960(F)
For a stock engine, it is recommended that you at least upgrade the head gasket to a metal type. With this setup the engine should be able to withstand up to around 350ps with the boost limited to around1.4~1.5kg/cm2 (19.9~21.3psi). For 1.6kg/cm2 boost, upgrading to forged pistons is highly recommended.
BX8265 This turbo is fundamentally designed for use with tuned/stroked engines with a displacement larger than 2.2l. On a stock engine, not only is it difficult to extract the full potential of this turbo, it may even damage the engine itself.
PISTONS   STOCK ENGINE TUNED ENGINE
(e.g. 2.5l stroker)
BX7760 FORGED PISTONS FORGED TOMEI PISTONS
BX7960(F)
BX8265
Stock pistons can withstand up to around 350ps. However, the M7960 turbo @ 1.6kg/cm²(22.8psi) boost significantly increases combustion pressure which can cause the stock pistons to melt. Therefore, It is highly recommended that you upgrade to forged pistons for high boost setups. The head gasket should also be upgraded at the same time.
CONNECTING RODS   STOCK ENGINE TUNED ENGINE
(e.g. 2.5l stroker)
BX7760 FORGED TOMEI H-BEAM CONRODS
BX7960(F)
BX8265 - FORGED TOMEI H-BEAM CONRODS
Stock camshafts are incapable of generating the exhaust pressure needed to take advantage of the larger turbo. Upgrading the camshafts will allow you to maximize the potential of the turbo. Camshafts should also be chosen based on your vehicle's setup.
CAMSHAFTS   STOCK ENGINE TUNED ENGINE
(e.g. 2.2/2.5l stroker)
BX7760 TOMEI PONCAM or similar
BX7960(F)
BX8265 - TOMEI PONCAM or similar
Stock camshafts are incapable of generating the exhaust pressure needed to take advantage of the larger turbo. Upgrading the camshafts will allow you to maximize the potential of the turbo. Camshafts should also be chosen based on your vehicle's setup.
HEAD GASKET   STOCK ENGINE TUNED ENGINE
(e.g. 2.2/2.5l stroker)
BX7760 STOCK TOMEI METAL HEAD GASKET
BX7960(F)
BX8265 -
Increasing boost will naturally increase combustion pressure. To maintain a secure seal at high boost is it strongly recommended that you upgrade to a high performance head gasket with superior sealing
INJECTOR CAPACITY   STOCK ENGINE TUNED ENGINE
(e.g. 2.2/2.5l stroker)
BX7760 More than 650cc
BX7960(F)
BX8265 - More than 830cc
Target horse power×5.9÷No. of cylinders required injector capacity per cylinder. Injectors should be operating at around 80~90% capacity to maintain good fuel atomization.
FUEL PUMP CAPACITY   STOCK ENGINE TUNED ENGINE
(e.g. 2.2/2.5l stroker)
BX7760 More than 185L/h(3kg/cm² fuel pressure)
BX7960(F)
BX8265 - Over 185L/h(3kg/cm² fuel pressure)
Injector capacity × No. of cylinders×0.06 required fuel pump capacity Fuel pumps should be operating at around 80~90 capacity to maintain good fuel flow.
FUEL PRESSURE REGULATOR   STOCK ENGINE TUNED ENGINE
(e.g. 2.2/2.5l stroker)
BX7760 Adjustable type: TOMEI TYPE-S or similar
BX7960(F)
BX8265 - Adjustable type: TOMEI TYPE-S or similar
Fuel pressure should be adjusted according to the fuel pump. Initial/atmospheric pressure should be set to 3kg/cm2.
AIR CLEANER   STOCK ENGINE TUNED ENGINE
(e.g. 2.2/2.5l stroker)
BX7760 High flow type
BX7960(F)
BX8265 - High flow type
Bolt-on replacement upgrade recommended if retaining MAF sensor.
MAF   STOCK ENGINE TUNED ENGINE
(e.g. 2.2/2.5l stroker)
BX7760 Stock MAF or without MAF
BX7960(F)
BX8265 - Without MAF
400ps is the maximum for a stock MAF.
SUCTION PIPE   STOCK ENGINE TUNED ENGINE
(e.g. 2.2/2.5l stroker)
BX7760 Upgrade as necessary
BX7960(F)
BX8265 - TOMEI SUCTION HOSE required.
Upgrading the suction pipe significantly improves air flow efficiency compared to the stock suction pipe which can sometimes warp during high boost. However, this may alter the MAF readings. Please ensure you make the necessary adjustments.
INTERCOOLER   STOCK ENGINE TUNED ENGINE
(e.g. 2.2/2.5l stroker)
BX7760 Upgrade recommended
BX7960(F)
BX8265 - Upgrade required
In general, pressurized air from the turbo is compressed and forced into the engine. However, the air from the has low oxygen content (low density) as the air is hot and expanded. This has an adverse effect on combustion efficiency and subsequently on performance. By installing an intercooler between the turbo and the engine, it allows the compressed air to be cooled before it enters the combustion chamber. This results in improved engine performance as the colder denser air improves combustion efficiency.
BLOW-OFF VALVE
(Re-circulation type)
  STOCK ENGINE TUNED ENGINE
(e.g. 2.2/2.5l stroker)
BX7760 High performance type (not vent to atmosphere)
BX7960(F)
BX8265 - High performance type (not vent to atmosphere
When the throttle closes, the pressurized air from the turbo has no where to go and is forced back towards the turbo. This puts significant stress on the compressor wheel and in some instances can be enough to stall it all together. To prevent this, a blow-off valve is installed between the turbo and throttle to recirculate the air to between the MAF and turbo. However, using a stock blow off valve for high boost setups will cause it to relief the boost prematurely, resulting in reduced response and power. Therefore it is highly recommended that you upgrade the blow-off valve to a high performance unit. It should be noted that whilst both vent-to-atmosphere type and recirculation type blow-off valve setups serve the same function of relieving boost, the former will often cause the MAF to give false readings. For this reason it is recommended that you recirculate the excess boost.
EXHAUST MANIFOLD   STOCK ENGINE TUNED ENGINE
(e.g. 2.2/2.5l stroker)
BX7760 Upgrade recommended
BX7960(F)
BX8265 - Upgrade required
With the increased exhaust pressure from upgrading the camshafts, a high flow exhaust manifold is needed to efficiently route the exhaust gases to the turbine wheel. This helps improve turbo spool and performance. However, on an EJ engine, the exhaust ports on the cylinder head and the turbo are far apart. This means that an exhaust manifold with pipes too wide will have an adverse effect on performance. When changing from an unequal to equal length exhaust manifold, changing to the respective type oil pan is also recommended. Failing to do so may result in reduced performance as the equal length pipes are longer and have more bends.
TURBO OUTLET
CATALYTIC CONVERTER
FRONT PIPE
  STOCK ENGINE TUNED ENGINE
(e.g. 2.2/2.5l stroker)
BX7760 Metal type, around φ70~φ75
BX7960(F)
BX8265 - Metal type, Metal type, around φ70~φ75
The stock turbo outlet/front pipe isn't capable of expunging the exhaust gasses efficiently. Especially at high rpms with higher boost, the confined exhaust gasses are unable to flow efficiently through the turbo, causing unstable boost. Upgrading the turbo outlet/front pipe to one with a larger opening helps solve this issue, providing improved turbo spool and stable boost. Upgrading to a metal catalytic converter greatly reduces exhaust flow resistance whist maintaining it's core function of reducing toxic gasses.
EXHAUST   STOCK ENGINE TUNED ENGINE
(e.g. 2.2/2.5l stroker)
BX7760 Around φ80
BX7960(F)
BX8265 - Around φ80
Similar to the turbo outlet, upgrading the exhaust improves performance in both the mid range and top end.
ECU   STOCK ENGINE TUNED ENGINE
(e.g. 2.2/2.5l stroker)
BX7760 Vehicle/setup specific
BX7960(F)
BX8265 - Vehicle/setup specific
The ECU should be adjusted to suit the vehicle/setup.
SPARK PLUG   STOCK ENGINE TUNED ENGINE
(e.g. 2.2/2.5l stroker)
BX7760 No. 8 / 9 or similar
BX7960(F)
BX8265 - No. 8 / 9 or similar
As the power increases, so does the combustion temperature. Using spark plugs of the same heat rating as stock may cause them to melt. To avoid this, it is recommended that you use No. 8 / 9 spark plus. However, ensure you check the spark plug tips to determine the best solution.
 
CATEGORY RECOMMENDATION
BOOST SETTING STOCK ENGINE 1.0~1.2kgf/cm2(14.2~17.1psi)
with boost controller
TUNED ENGINE
(e.g. 2.3l stroker)
1.6kgf/cm2(22.8psi)
with boost controller
POWER STOCK ENGINE 350~370ps
TUNED ENGINE
(e.g. 2.3l stroker)
Around 450ps
CAMSHAFTS STOCK ENGINE Stock / longer duration
Recommended: TOMEI PONCAM
TUNED ENGINE
(e.g. 2.3l stroker)
Longer duration cams Recommended: TOMEI PONCAM
HEAD GASKET STOCK ENGINE High performance, metal type Recommended: TOMEI METAL HEAD GASKET
TUNED ENGINE
(e.g. 2.3l stroker)
INJECTOR CAPACITY STOCK ENGINE 550cc or larger
Target horse power×5.9÷No. of cylinders=required injector capacity
TUNED ENGINE
(e.g. 2.3l stroker)
FUEL PUMP STOCK ENGINE 240L/h or larger
Injector capacity×No. of cylinders×0.06=required fuel pump capacity
TUNED ENGINE
(e.g. 2.3l stroker)
FUEL PRESSURE REGULATOR STOCK ENGINE Adjustable type Recommended: TOMEI TYPE-S
TUNED ENGINE
(e.g. 2.3l stroker)
AIR CLEANER STOCK ENGINE Recommended: Bolt-on, high flow type
TUNED ENGINE
(e.g. 2.3l stroker)
SUCTION PIPE STOCK ENGINE Recommended: TOMEI TURBO SUCTION HOSE
TUNED ENGINE
(e.g. 2.3l stroker)
INTERCOOLER STOCK ENGINE Standard or large capacity type
TUNED ENGINE
(e.g. 2.3l stroker)
EXHAUST MANIFOLD STOCK ENGINE Standard or high flow type
TUNED ENGINE
(e.g. 2.3l stroker)
OUTLET/FRONT PIPE STOCK ENGINE High flow type Recommended: TOMEI EXPREME
TUNED ENGINE
(e.g. 2.3l stroker)
CATALYTIC CONVERTER STOCK ENGINE High flow type
TUNED ENGINE
(e.g. 2.3l stroker)
EXHAUST STOCK ENGINE Around Φ80 main section
TUNED ENGINE
(e.g. 2.3l stroker)
ECU STOCK ENGINE Vehicle/setup specific
TUNED ENGINE
(e.g. 2.3l stroker)
BLOW-OFF VALVE STOCK ENGINE High performance type
TUNED ENGINE
(e.g. 2.3l stroker)
SPARK PLUG STOCK ENGINE No. 8 / 9 or similar
TUNED ENGINE
(e.g. 2.3l stroker)
 
CATEGORY RECOMMENDATION
BOOST SETTING   STOCK ENGINE TUNED ENGINE
(e.g. 2.3l stroker)
BX7960 1.4~1.5kgf/cm2 (19.9~21.3psi) with boost controller 1.6kgf/cm2 (22.8psi) with boost controller1.6kgf/cm2(22.8psi)
with boost controller
BX7967
POWER BX7960 360~370ps 400~420ps
BX7967 420~430ps
CAMSHAFTS BX7960 Longer duration cams required
Recommended: TOMEI PONCAM
BX7967
HEAD GASKET BX7960 High performance type recommended TOMEI METAL HEAD GASKET High performance type requiredHigh performance type required
BX7967
INJECTOR CAPACITY BX7960 620cc or larger 680cc or larger
BX7967 760cc or larger
FUEL PUMP BX7960 165L/h or larger(3kg/cm² pressure)v 182L/h or larger (3kg/cm² fuel pressure)
BX7967 220L/h or larger (3kg/cm² fuel pressure
FUEL PRESSURE REGULATOR BX7960 Adjustable type required
Recommended: TOMEI TYPE-S
BX7967
AIR CLEANER BX7960 Bolt-on, high flow type recommended
BX7967
SUCTION PIPE BX7960 High efficiency type recommended High efficiency type required
BX7967
  TOMEI turbo suction hose recommended
INTERCOOLER BX7960 Standard or large capacity type
BX7967
EXHAUST MANIFOLD BX7960 High efficiency type required TOME EXPREME recommended
BX7967
OUTLET/FRONT PIPE BX7960 High efficiency type required TOME EXPREME recommended
BX7967
CATALYTIC CONVERTER BX7960 High efficiency type required Sports/metal type catalytic converter
BX7967
EXHAUST BX7960 High efficiency type required Around Φ80 main section
BX7967
ECU BX7960 Vehicle/setup specific
BX7967
BLOW-OFF VALVE BX7960 High performance type required
BX7967
SPARK PLUG BX7960 Higher rating required valve recommended No. 8 / 9 or similar
BX7967
 
CATEGORY RECOMMENDATION
BOOST SETTING STD 1.0~1.1kg/cm²(14.2~15.6psijwith boost controller
TUNED 1.6kg/cm²(22.8psijwith boost controller
The BX7960 turbo is capable of making over 400ps @ 1.6kg/cm²(22.8psi) boost. However, around 330ps is the maximum stock engine internals are able to to withstand before parts such as connecting rods begin to fail. Accordingly, boost should be limited to around 1.0~1.1kg/cm²(14.2~15.6psi). Note that boost settings should be made in 4th/5th gear. Configuring boost in lower gears will result in higher actual boost as load is significantly greater at higher gears. (You may notice that boost begins to fall as you raise the rpm beyond peak boost. This is normal)
POWER STD 330ps
TUNED 400ps
Camshafts, turbo suction pipe, exhaust manifold, turbo outlet, catalytic converters as well as exhaust systems can all impact performance. With stock camshafts, exhaust manifold and turbo outlet around 350ps is achievable @ 1.0~1.1kg/cm²(14.2~15.6psi) boost. Upgrading all the above should make around 400ps @ 1.6kg/cm²(22.8psi) boost.
PISTONS STD Stock
TUNED FORGED PISTONS
Stock pistons can withstand up to around 330ps. However, the BX7960 turbo @ 1.6kg/cm²(22.8psi) boost significantly increases combustion pressure which can cause the stock pistons to melt. Therefore, It is highly recommended that you upgrade to forged pistons for high boost setups. The head gasket should also be upgraded at the same time.
CONNECTING RODS STD Stock
TUNED H-BEAM CONNECTING RODS
Stock connecting rods can withstand up to around 330ps. .Beyond this, it is highly recommended that you upgrade the connecting rods
CAMSHAFTS STD TOMEI PONCAM or similar
TUNED
Stock camshafts are incapable of generating the exhaust pressure needed to take advantage of the larger turbo. Upgrading the camshafts will allow you to maximize the potential of the turbo.
HEAD GASKET STD Stock
TUNED High Performance Type
Increasing boost will naturally increase combustion pressure. To maintain a secure seal at high boost is it strongly recommended that you upgrade to a high performance head gasket with superior sealing.
INJECTOR CAPACITY STD 550cc
TUNED More than 650cc
Target horse power×5.9÷No. of cylinders required injector capacity per cylinder. Injectors should be operating at around 80~90% capacity to maintain good fuel atomization
FUEL PUMP CAPACITY STD More than 240L/h(3kg/cm² fuel pressure)
TUNED
Injector capacity×No. of cylinders×0.06 required fuel pump capacity Fuel pumps should be operating at around 80~90 capacity to maintain good fuel flow.
AIR CLEANER STD High flow type
TUNED
The air cleaner/filter should be upgraded to suit the power output of the engine.
MAF STD Either with or without stock MAF
TUNED
 
SUCTION PIPE STD Stock or bolt-on upgrade
TUNED Straight type
Upgrading the suction pipe significantly improves air flow efficiency compared to the stock suction pipe which can sometimes warp during high boost. However, using a straight type suction pipe while retaining the MAF sensor may cause rough idling and/or more frequent stalling.
INTERCOOLER STD Something better than bolt-on upgrade
TUNED High capacity, high efficiency type
In general, pressurized air from the turbo is compressed and forced into the engine. However, the air from the has low oxygen content (low density) as the air is hot and expanded. This has an adverse effect on combustion efficiency and subsequently on performance. By installing an intercooler between the turbo and the engine, it allows the compressed air to be cooled before it enters the combustion chamber. This results in improved engine performance as the colder denser air improves combustion efficiency. The Hyundai GENESIS has a notoriously small intercooler and is particularly susceptible to high intake temperatures.
BLOW-OFF VALVE
(RECIRCULATION VALVE)
STD High performance type (vent to atmosphere
TUNED
When the throttle closes, the pressurized air from the turbo has no where to go and is forced back towards the turbo. This puts significant stress on the compressor wheel and in some instances can be enough to stall it all together. To prevent this, a blow-off valve is installed between the turbo and throttle to recirculate the air to between the MAF and turbo. However, using a stock blow off valve for high boost setups will cause it to relief the boost prematurely, resulting in reduced response and power. Therefore it is highly recommended that you upgrade the blow-off valve to a high performance unit. It should be noted that whilst both vent-to-atmosphere type and recirculation type blow-off valve setups serve the same function of relieving boost, the former will often cause the MAF to give false readings. For this reason it is recommended that you recirculate the excess boost.
EXHAUST MANIFOLD STD Stock
TUNED High flow, high efficiency type
With the increased exhaust pressure from upgrading the camshafts, a high flow exhaust manifold is needed to efficiently route the exhaust gases to the turbine wheel. This helps improve turbo spool and performance.
TURBO OUTLET STD Stock
TUNED High flow, high efficiency type
The stock turbo outlet isn't capable of expunging the exhaust gasses efficiently. Especially at high rpms with higher boost, the confined exhaust gasses are unable to flow efficiently through the turbo, causing unstable boost. Upgrading the turbo outlet to one with a larger opening helps solve this issue, providing improved turbo spool and stable boost.
FRONT PIPE STD Around φ76.3
TUNED
Similar to the turbo outlet, upgrading the front pipe improves performance in both the mid range and top end.
CATALYTIC CONVERTER STD Metal type
TUNED
Upgrading to a metal catalytic converter greatly reduces exhaust flow resistance whist maintaining it's core function of reducing toxic gasses
EXHAUST STD Around φ80~90
TUNED
Similar to the turbo outlet, upgrading the exhaust improves performance in both the mid range and top end.
ECU STD Vehicle/setup specific
TUNED
The ECU should be adjusted to suit the vehicle/setup.
SPARK PLUG STD No. 8 / 9 or similar
TUNED
As the power increases, so does the combustion temperature. Using spark plugs of the same heat rating as stock may cause them to melt. To avoid this, it is recommended that you use No. 8 / 9 spark plus. However, ensure you check the spark plug tips to determine the best solution.