Please Help With Fuel Trims!

[slvrDsm]

whats up guys.. Ok here is the situation.. Im goona be taking my car to full function to get tuned next week.. But in order to save me ALOT of money i want to set my fuel trims before i get there so he has a stable base to work from.. so here is a log.. I tried to mess around with the LTFT lo and the STFT its as far as i got.. Tell me what you think guys..Ant input is MUCH appreciated.

 

[snowborder714]

With seeing how low your current 50Hz slider is, and the fact that LTFTLo is bouncing around -4% (which would mean you need to lower the 50Hz slider even more), I would suggest dropping your deadtime. Deadtime and the 50Hz slider work inversely, so by dropping that it should raise your 50Hz slider.

The reason I'm saying this is that being on a stock 2g MAS, your airflow sliders shouldn't have to be adjusted that much.

Try dropping to 300 deadtime.

 

[Calan]

The reason I'm saying this is that being on a stock 2g MAS, your airflow sliders shouldn't have to be adjusted that much.

Unless he's running a MAS in blow-through

OP - what configuration is your PCV system in?

Try dropping to 300 deadtime.

Yep... his AirFlowPerRev is low also, which also points to injector DT being off.

 

[snowborder714]

According to his profile his MAS/MAF setup is stock. It looks to be stock in the one engine bay shot too.

And you can't correctly run a MAS in blow thru It would have to be a MAF, specifically the GM variety.

 

[Calan]

And you can't correctly run a MAS in blow thru It would have to be a MAF, specifically the GM variety.

Yeah.. I was using the term generically to apply to any mass airflow sensor, not a 2g MAS in particular. But you make a good point.

 

[slvrDsm]

Ahh. I see... Ok.. well Ya its a stock 2g MAF.. And I will try the 300 deadtime as soon as i can.. Should i just 0 out the airflow meters again after I input the new deadtime? thanks for the quick response.. I really need to get these trims good..

Eric

 

[slvrDsm]

Ok here is a log with 300 deadtime.. No matter what I did I could not get the stupid trims close.. Seems harder with the deadtime at 300.. let me know what you guys think..