Tomei Powered ARMS M8260 - Manual (Page 34)

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.
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.
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.
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.
Please select the correct air cleaner capacity which best suits the target horsepower range.
Recommended: TOMEI 276L/h or more (Fuel Pres. @ 3kg/ ㎠)
M8260 : Tuned engine, Recommended : TOMEI Type-L
M7655 ： 600cc or larger - Recommended: TOMEI700cc
M7655: 240L/h or higher -
INJECTOR SIZE
M8260 ： 700cc or larger
AIR CLEANER High Flow Type
HEADGASKET
UPGRADE TO METAL TYPE
Recommended: TOMEI Metal Gasket Combination
FUEL PUMP SIZE
M8265 : Recommended : TOMEI280L/h (Fuel Pressure @ 3kg/ ㎠)
FUEL PRESSURE REGULATOR
M7655 : Stock Engine, Recommended : TOMEI TYPE-S
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The stock AFM limit is in the 450-480PS range. The NISMO AFM will allow up to 700PS.
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.
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.
M7655 : Nismo Type or Air Flow Less
M8260 : Without Air Flow
SUCTION PIPE High Flow Type
AIR FLOW
INTERCOOLER Large Capacity High Flow Type
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