NW 102mm Idle Airflow minimum

[Sébast19X]

I want to know if the Airflow final minimum table should help me to dial some trouble glitch that I want to correct on my car.

Here it is: At idle, TPS are 15%, 0.73V, spark adapt oscillate around -4 to +2.
Engine temp 90C.

Idle rock steady, I press de pedal to rev it at 3000 rpm or so and everything is fine when the throttle was depressed and return to idle.

The glitch: I try to press de gas pedal just a very little bit, the spark state change from idle to main (OK), and the TPS voltage climb slowly to 0.90V(Even if my foot won't move) and the TPS climb slowly at 19% and the engine rev from 750 rpm to around 1400 RPM or so.If I let off a very very little bit the spark state return to idle, and the TPS goes to 16% and then 15% (Idle state)

It was impossible to to keep it at eg: 0.85V 17% and 1000 RPM, 12000 RPM or whatever RPM between 750 RPM idle and 1400 RPM.

I have played alot with throttle follower , not a real success , Throttle MAP A (I have lowered and bumped the number at 15% and 26%) No real success.

I'm wondering if my Base running airflow are too high can cause this kind of glitch ...

My base running airflow number, match my MAF transfert function g/sec for most of the RPM selection at +- 0.25 g/sec with stft at +-3%.(650RPM to 1200 RPM)

I'm a little lost. Any help would be appreciate.

Thx
Sebastien

[Sébast19X]

I found it.
I have substracted airflow from the final airflow minimum. Ending at(-2.00 g/sec).Throttle control stay perfectly stable, and it seem to use less spark control at idle.

I can hold the throttle now at 1000, 1100 , 1200, 1300 and every rpm I want.

I will investigate later on this. The Maf airflow seem to not translate directly on my RAF. I doubt that my MAF are dialed incorectly, AFX wideband.

My TB area scalar are set at 7150 ...
Maybe I'm forgot something.

Later,
Sebastien

[pontisteve]

How did you come up with a TB area scalar of 7150? I came up with 6 thousand and something.

I have a problem where it seems almost impossible to get idle RPM below about 950. These LS2's seem very tempermental about idle.