Rpm/idle Setting Apexi Ecu?

[leeroy_25]

Okay guy's wondering if anyone could assist me with a few little questions I have.

1st I have always noticed my car rev counter does not read the same as the power FC hand commander. It is about 200rpm out? Is this normal for a start or is there some way to get the car better in sink with the ECU. Also which is actually correct!? I did try re-learning the idle which did not seem to help.

next is the idle.. I don't know if this is actually a faulty idle control valve or related to the above but in the RPM settings you can set idle1 and idle2. Mine are set to 900 and 950rpm respectively. However the car idles has to be set by the air bleed screw in the idle control valve. It seems the ECU does not control it? It starts col and idles around 1200-1500rpm then when warm idles at around 1000-1050 although since my re-map that has dropped to around 850-900 to be honest but I am not convinced the settings for ide 1 and 2 have any effect on that? Can I test by raising or dropping them? Also I noticed when hot if the car is sat idling, after a while the rpm slowly increases? Would this air temp correction if the air inlet temp is going over 40degs? Which is very possible.

Just to point out if you put the a/c or other load on the rpm value does rise up as it should.

Lastly What exactly is the effect of changing the Fuel Cut values in the rpm setting screen.. i.e if I raise them up or down?

Thank you

Lee

[JonnoHR31]

power fc rpm is more accurate, factory tachos are never accurate, especially at high rpm.

the rpm settings in the power are supposed to be the target idle figures, but it doesnt do a very good job of it. your correct in that you have to adjust the idle screw to set your base, then the pfc adjusts the iac to raise and lower the idle.

air temp correction usually pulls timing, which would lower the idle, not raise it. regardless when idling the ecu goes into closed loop and im pretty sure intake temp is mostly ignored.

the fuel cut setting is the lowest rpm the pfc will fuel cut down to. it will only cut down to this rpm under very slow decceleration, such as coasting in 5th, if the revs are dropping faster it'll cut back it at a higher rpm to catch it in time. ideally you want this figure as low as you can without it causing any issues, such as stalling or jolting at low rpm.