Tomei Powered ARMS M7960 - Manual (Page 23)

SETUP GUIDE
M7960
M8270
The ARMS M7960 turbo is capable of over 400ps with 1.6k of boost. It is recommended to upgrade
the head gasket to increase the engine strength and to minimise the chances of leakages.
The stock engine is capable of producing around 300-330ps at best. In this case, the boost is usaully
at around 1.1-1.2k. When making changes to the boost setting, please do it when you are in 4th/5th gear.
If you make changes whilst in a lower gear, the load will then be greater at a higher gear, and therefore
the boost will be higher than the initial setting. (After setting the boost might drop as the rpm rises
to peak boost. But don't be alarmed as this is normal.)
M7960
M8270
The actuator is already pre-set for optimum efficiency. However in order to stabilize boost at a higher loads,
it is best to use a boost controller to make the required adjustments. By adjusting the actuator and
stabilizing the boost you can change the characteristics to suit your needs. If required, the use of a boost
controller is highly recommended if you want to adjust the actuator settings.
M7960 400∼420ps
M8270 430∼450ps
The stock engine weakpoint is with the head gasket. So at stock condition, the SR20 is capable of
around 330ps at best. That is the max limit with a max boost setting of 1.0 to 1.1 kg / cm² (14.2-15.6psi)
when taking reliability into account. Boost of 1.3 kg / cm² (18.49psi) is possible after upgrading
the head gasket to a metal head gasket. And boost seetings of 1.5 to 1.6 kg / cm² (21.3-22.8psi) is possible
when running Forged Pistons.
M7960
M8270
The stock SR20DET pistons are another weak point that has to be addressed when aiming for
more than 330ps. When running either M7960, M8270 turbos with 1.6kg/cm² boost, the higher the combustion
pressure, the higher the risk of the stock Pistons failing. {1.3 kg/cm² (18.49psi) boost is the max limit
ACTUATOR SETTINGS
PISTONS
ITMES RECOMMENDET SET UP
BOOST SETTINGS
Forged Pistons Recommended: TOMEI Forged Piston Kit
Not Required [ Initial Setting 0.9kg/cm² 12.8psi]
1.6㎏/cm² (22.8psi) Boost Controller Recommended
TARGET POWER
pressure, the higher the risk of the stock Pistons failing. {1.3 kg/cm² (18.49psi) boost is the max limit
of the stock Pistons. There has been cases of the engine lasting about a year with the stock pistons.}
When running higher boost, together with the upgraded Head Gasket,
Forged Pistons are highly recommended.
M7960
M8270
Raising the boost also increases combustion pressure. In that case the standard head gasket will just no do.
By changing to a Metal Head Gasket, reliability is increased and you can then run more boost.
The head gasket thickness will also change the compression ratio and thus more power gain is also possible.
M7960
M8270
This is an easy formula to use to calculate what you need.?
Cylinder horsepower objective×5.9÷ = discharge per minute required per cylinder?
To ensure stable atomization conditions, the injector(s) need to run at 80 to 90 percent conditions.
capacity to be ideal and to maintain safe
M7960
M8270
Injector size × number of cylinders × 0.06 = discharge rate (Fuel capacity)?
Considerating the fuel pump efficiency, please select one that will be suitable whilst running
at 80-90% efficiency to allow a safety buffer.
M7960
M8270
Due to changes with the fuel pump, the fuel pressure will have to be adjusted to suit the new setup.
The initial fuel pressure is set to atmospheric pressure of 3kg/cm².
M7960
M8270
If you have upgraded the Air Flow Meter, upgrading the Air Cleaner is also highly recommended.
23
FUEL PRESSURE REGULATOR
Required for adjusting the fuel system changes.
Recommended TOMEI Type-S
AIR CLEANER High Flow Type
182L/h or more (when fuel pressure is at 3kg/cm²) Recommended:
TOMEI 248L/h (when fuel pressure is at 3kg/cm²)
680cc or higher Recommended: TOMEI 740cc
HEAD GASKETS
Upgrading to Metal Type
Recommened: TOMEI Metal Head Gasket
FUEL PUMP
INJECTOR SIZES