Tomei Powered ARMS M8260 - Manual (Page 35)

When the throttle is suddenly closed, the forced air from the Turbine will have no where 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.
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.
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.
The larger diameter pipe, the exhaust flow will be optimized which will maximize the Turbos
and engines performance with a good stable boost control.
TURBINE OUTLET TOMEI EXPREME or Similar
FRONT PIPE Recommended: Pipe Size φ70×2 or Similar
CATALYTIC CONVERTER Recommended: Metal Catalyzer
EXHAUST MANIFOLD TOMEI EXPREME or Similar
Recommended: STRENGHTENED TYPE (Recirculation Type)
BLOW OFF VALVE
(Recirculation Type)
35
With the use of a high flow performance Metal Catalytic Converter you can increase the performance
with increasing the exhaust flow.
As with the TOMEI outlet pipe design a larger diameter design with smooth internal design
to restrictions. maximize exhaust flow and not cause any performance
An aftermarket ECU is required to optimize the setup of your engine with the new setup.
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.
PLUGS
MUFFLER Recommended: Main Pipe Diameter φ90 or Similar
ENGINE MANAGEMENT (ECU) Optimize the Engines Setup
UPGRADE REQUIRED Recommended: 8~9 Heat Range
35