CPS is for volumetric efficiency for the engine due to the inertia of the petrol + oxygen mixture entering the combustion chamber..

owh.. really ar? hehe.. y ar? so, what is VIM and what is CPS?

from what i understand through readings from proton website & learnings..

what actually happend when we suddenly ram the accel pad is,
1st, more air come in,
2nd, due to bernoulli principle, the air 'drives' the fuel to come out from inside a venturi tube alike..
3rd, they mix together and enter inlet manifold...

this whole process takes time..
sometimes, in sudden accel, more air come..
the air flow cannot drive fuel to go out the venturi instantly...
thus, creating a weak mixture to be burned in combustion chamber...
oh yeah, it lags just milisecond, maybe microseconds..
but, the impact to the engine performance is tremendous...

so, they introduces the IAFM...
IAFM is all about adjustment made at inlet manifold..
it 'injects' fuel at the same proportion as the amount of air entering..
thus, creating a stable (same fuel-air mixture proportion) entering inlet manifold..

so, it helps reduce in 'power lagging' when we sudden ram the accelerator pedal..
and yes, it is due to inertia principle.

but, due to the same fuel-air proportion entering the combustion chamber, it does not help in increasing the horsepower.. it just able to give instant power..

however, at the inlet valve...
the mixture still have problem to enter the combustion chamber.. yeah, again it is due to inertia..
the mixture does not have sufficient time to enter combustion chamber bcoz the valve open and close at a very high speed... the time interval is so damn small..

so they introduce the CPS..

CPS is the adjustment of the cam, so that the inlet valve opens more, or longer, to let more air come in and more used air go out at high rev., to reduce error due to mixture inertia... how? by increasing the valve stroke length..

more mixture DOES enter the combustion chamber...
more used mixture DOES goes out from the combustion chamber to the exhaust..
in other words, the engine have more volumetric efficiency...

so, it does gives more horse power..

however, it does not disturbs the otto cycle opening (leading) and closing (lagging) degree..
nah~~ im not going into otto cycle anyway..

anyway...here some quotes from proton website..

gate shifter tu apa?