Almost 140K on stock O2s
Dec 18, 2009 | 10:00 AM
#14
Your problem IMO is learning (PCM not your Intelligence) and not tuning the MAF and VE table... The reason i say this is because the way the VE table influences the airflow calculation while the MAF is turned on...
reason behind my thinking, look at the definition of B0120
Originally Posted by B0120 - RPM Threshold for Airflow Calculation
If engine speed is less than this value, then the PCM uses a dynamically calculated airflow value to determine grams of air per cylinder.
While the airflow is in a "steady state", then a correction factor is updated based on the airflow difference between the MAF sensed airflow and the MAP calculated airflow.
During rapid changes in airflow, the correction factor is applied to the airflow calculations to compensate.
If engine speed is above this value, then the PCM will use the MAF sensor exclusively (if not disabled by DTCs) to calculate grams of air per cylinder.
No updates are made to the airflow correction factor.
While the airflow is in a "steady state", then a correction factor is updated based on the airflow difference between the MAF sensed airflow and the MAP calculated airflow.
During rapid changes in airflow, the correction factor is applied to the airflow calculations to compensate.
If engine speed is above this value, then the PCM will use the MAF sensor exclusively (if not disabled by DTCs) to calculate grams of air per cylinder.
No updates are made to the airflow correction factor.
So let me try to explain that. While your driving around the computer is calculating the difference between your MAF airflow and your VE airflow calculations/readings... This difference is added to the final airflow calcuation. Which if they are not BOTH tuning/scaled/adjusted properly there will be a difference, as time goes by this difference grows and it is added to the airflow calc. Thus making your airmass wrong, which makes your reference the wrong timing value... On a NA tune, TIMING=POWER(hp)....
Make sense....
I don't think that is a good idea, he is not out flowing the MAF so no need to take it out of the airmass calcuation logic... IMO people who suggest this are not tuning the MAF and VE correctly (no offense).... As long as your not outflowing it, the screen is still attached and it is working properly, then there is NO REASON TO REMOVE IT
Last edited by BlackGMC; Dec 18, 2009 at 10:06 AM.
Dec 18, 2009 | 10:12 AM
#15
Thread Starter
Wearin' da big hat
iTrader: (10)
Joined: Jan 2008
Posts: 10,262
Likes: 9
From: Over There
That makes sense corey. Once I figured out why the hell my wideband isn't working, and get it wired right to hook it up to EFILive, I will start working on it. I have a few days off next week, so I'll probably get to work on it then.
Dec 18, 2009 | 10:32 AM
#18
Dec 19, 2009 | 09:18 AM
#20
