SETUP GUIDE

■BOOST SETTINGS
M7655
1.6㎏/cm²(22.8psi) on a Boost Controller
M8260

At 1.6k of boost, the ARMS M7960 is capable of 580PS and the M8260 is capable of 650PS. The stock engine first weak point is the head gasket. So at the very least, the upgrade of the head gasket to the metal type is highly recommend. With the Metal head gasket, 500PS is achievable with the M7655 Turbos with 1.1~1.2㎏/cm²(15.6~17.1psi) of boost. With the addition of forged pistons, the engine can then safely handle boost up to 1.5~1.6㎏/cm² (21.3~22.8psi). Boost should be set whilst in 4th or 5th gear. As when it is changed whilst in lower gear, the higher load in lower gear will result in the wrong boost settings. (It’s not abnormal to see on some occasions when the rpm reaches its peak and the boost drops).
 
■ACTUATOR SETTINGS
M7655
Not Required {The pre-set pressure is 0.9㎏/cm² (12.8psi)}
M8260

The actuator has been pre-set at our factory, so there is no need for any additional adjustments. But it is best to have a boost controller installed to make the required adjustments on the day when driving conditions demand certain performance conditions.
 
■TARGET POWER
M7655
580ps
M8260
650ps

M7655
The stock engine can be able to produce 500PS (with 1.1~1.2㎏/cm² (15.6~17.1psi) of boost). The head gasket will have to be upgraded to a Metal type to make it possible. If the Pistons are upgraded to Forged Pistons, then it can handle more boost of up to 1.6㎏/? and more power gains are possible.
 
M8260
This turbo was mainly designed to for tuned engines which can handle the higher power potential of these Turbos. The stock engine is not suitable for these Turbos as the internals are not designed to cope with this amount of power. Also the stock engine will not be capable to bring out the true efficiency of these Turbos. So please consider these Turbos only for higher end tuned engines.
 
■PISTONS
M7655
FORGED PISTONS
RECOMMENDED: Tomei Forged Piston Kit
M8260

The stock pistons limit is up to 500PS. Forged Pistons are required from this power level and higher. When running either M7655 & M8260 Turbos at 1.6㎏/cm² (22.8psi) of boost, the combustion pressure will be significantly higher which can quickly lead to pre-ignition which can quickly melt or burn the pistons. This is when the stock pistons will soon reach their limit. So high boost applications will require a Metal Head Gasket to be used with Forged Pistons.
■CONRODS
M7655
H-BEAM CONRODS
RECOMMENDED: TOMEI H-Beam Connecting Rods
M8260

The stock connecting rods are one of the weak points of the RB26 engine. When aiming for more than 550PS, then it is highly recommended to upgrade the connecting rods.
■CAMSHAFTS
M7655
TOMEI PONCAM type-B OR SIMILAR
M8260
TOMEI PROCAM 270°-10.25mm OR SIMILAR

The stock camshafts are inadequate to obtain sufficient exhaust pressure when using larger Turbos. So camshafts become a vital part of the engine tuning process. It helps change the engines characteristics to help utilize the larger Turbos potential.
■HEAD GASKET
M7655
UPGRADE TO METAL TYPE
Recommended: TOMEI Metal Gasket Combination
M8260

When boost is increased, the combustion pressure is also raised. The Metal Head Gasket helps strengthen your engine to handle more power with the increase in sealing efficiency. You choose the right Gasket thickness to suit your desired compression ratio to suit the boost settings that you'd like to run the engine at. Another common weak point of the RB26 engine is the gaskets of the intake and exhaust assembly gaskets. So we also recommend these to be upgraded too.
■INJECTOR SIZE
M7655
600cc or HIGHER Recommended: TOMEI 700cc
M8260
700cc or HIGHER

To work out the injector sizes you need you use this formula,
Target Horsepower x 5.9 ÷ No. of Cylinders = the cc flow amount per cylinder required.
Take into account that you will run up to 80%~90% of the injector’s capacity.
■FUEL PUMP SIZE
M7655
240L/h or more (Fuel Pres. @ 3kg/cm²)
Recommended: TOMEI 276L/h (Fuel Pressure @ 3kg/cm²)
M8260
280L/h or More (Fuel Pressure @ 3kg/cm²)

To work out the fuel pump size you need you use this formula,
Injectors Capacity x No. of Cylinders x 0.06 = Fuel Pump flow rate required. Then consider that the fuel pump should be used at 80~90% capacity when making your choice.
■FUEL PRESSURE REGULATOR
M7655
Recommended: TOMEI Type-S
M8260
Recommended: TOMEI Type-L

Changing the fuel pump will require you to adjust the fuel pressure with an adjustable fuel pressure regulator to suit the new setup. You will need to set it at 3k when idling without the vacuum hose being connected.
■AIR CLEANER
M7655
High Flow Type
M8260

Please select the correct air cleaner capacity which best suits the target horsepower range.
 
■AIR FLOW
M7655
Nismo Type or Air Flow Less
M8260
AIR FLOW LESS

The stock AFM limit is in the 450-480PS range. The NISMO AFM will allow up to 700PS.
 
■SUCTION PIPE
M7655
高効率タイプ
M8260

When the throttle is suddenly closed, the forced air from the Turbine will have no where When running higher boost, the stock suction pipe at times can deform under high pressure conditions, this hinders intake efficiency. With the use of a hard pipe type, it then resolves the problem and increase performance gains.
 
■INTERCOOLER
M7655
Large Capacity High Flow Type
M8260

Pressurized air from the Turbine is compressed and sent to the engine. This process forces the air temperature to increase with heat. So when it does, the air density drops and combustion efficiency becomes poor, resulting to performance loss. The intercoolers job is then to extract the heat from the forced air via the fins in the intercooler. This again helps compress the air again, and the denser colder air will improve combustion efficiency to optimize performance.
 
■BLOW OFF VALVE (Recirculation Type)
M7655
Recommended: STRENGHTENED TYPE (Recirculation Type)
M8260

to go. This restricted flow places a heavy burden on the turbo and other parts. So the Blow Off Valve is fitted somewhere between the turbo and the throttle to prevent this problem by giving an option of an escape route to vent the excess pressure. This saves the turbo from any possible problems. The stock BOV was never designed to handle high boost applications, so it will struggle to do it's job properly when the limits are exceeded. This puts the turbo at risk of failure and response drops. This is why we recommend to upgrade the BOV to a stronger type. Additionally, when the BOV is a vent to atmosphere type, this can cause other problems with the ECU not being able to read correct air volume that is flowing into the engine. As the volume of air still passes through the air flow meter but not all of if goes to the engine. In this case the air to fuel mixture will be incorrect. So we recommend the recirculation type design.
 
■EXHAUST MANIFOLD
M7655
TOMEI EXPREME OR SIMILAR
M8260

When upgrading the camshafts to optimize the Turbos performance it is best to also upgrade the exhaust to maximize the performance potential of the setup. With the EXPREME exhaust manifold design the exhaust backpressure will be improved to give you an easier and sharper turbine spool.
■TURBINE OUTLET
M7655
TOMEI EXPREME OR SIMILAR
M8260

The standard outlet pipe is not suitable for exhaust flow. The exhaust will clog the exhaust gases with high speed, high boost due to the narrow pipe diameter which causes a bottleneck effect. This will drop the turbines efficiency due to the restrictions on the exhaust flow hindering boost capabilities.
■FRONT PIPE
M7655
Recommended: Pipe Size φ70×2 or Similar
M8260

The larger diameter pipe, the exhaust flow will be optimized which will maximize the Turbos and engines performance with a good stable boost control.
 
■CATALYTIC CONVERTER
M7655
Recommended: Metal Catalyzer
M8260

With the use of a high flow performance Metal Catalytic Converter you can increase the performance with increasing the exhaust flow.
 
■MUFFLER
M7655
Recommended: Main Pipe Diameter φ90 OR SIMILAR
M8260

As with the TOMEI outlet pipe design a larger diameter design with smooth internal design to maximize exhaust flow and not cause any performance restrictions.
NOTE: Tomei EXPREME Ti is coming soon for the BNR32, BCNR33 and BNR34 GTR.
 
■ENGINE MANAGEMENT
M7655
Optimize the Engines Setup
M8260

An aftermarket ECU is required to optimize the setup of your engine with the new setup.
 
■PLUGS
M7655
UPGRADE REQUIRED Recommended: 8~9 Heat Range
M8260

With the increase of horse power, the increase in combustion temperatures and this will be a risk of the plugs from melting. The recommended plug heat range of 8-9 is suitable.
 
 


Copyright (C) 2006 TOMEI POWERD,Inc. All Rights Reserved.