For WOT AFR : VE or MAF?
My tuner commanded a certain AFR at WOT (12.6), then used the VE table and made adjustments there until the car hit the desired 12.6 AFR at WOT. This was in an MAFless speed density tune, but even with a MAF the fueling is calculated from the VE table.
unless your running with SD then you would change it with the maf since the factory setting is maf only for airflow 4400rpms and up. below 4400rpms its a combo of the maf/ve table the pcm uses for fueling.
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You tune the VE and Maf for drivabilty to around 4000rpm, and then you can tune the VE as well for WOT and then tune the MAF for WOT to get your desired AFR. This way if your MAF ever happens to go bad, if tuned properly you will never know the MAF failed other than the check engine light on the dash..
You tune the VE and Maf for drivabilty to around 4000rpm, and then you can tune the VE as well for WOT and then tune the MAF for WOT to get your desired AFR. This way if your MAF ever happens to go bad, if tuned properly you will never know the MAF failed other than the check engine light on the dash..
but if i wante to calbrate the WOT
should i then adjust the desired numbers in PE table,
and log the WOT
should i calbrate in the MAF table or in the VE table
or maby both
thanks
Baezi
TECH Enthusiast
Joined: Nov 2006
Posts: 620
Likes: 0
From: Katherine N.T Australia
Above 4000rpm the controller is set (stock value) to run exclusively off the MAF. Its always best practice to tune the VE here too but you have to turn the MAF off the same as you would when tuning below 4000rpm (which I hope your doing as if your not you'll never get it right).
Adjusting the PE only alters the commanded AFR. You won't have to touch that as what your doing by tuning your MAF and or VE is getting the commanded AFR to match the actual AFR.
Above 4000rpm the controller is set (stock value) to run exclusively off the MAF. Its always best practice to tune the VE here too but you have to turn the MAF off the same as you would when tuning below 4000rpm (which I hope your doing as if your not you'll never get it right).
Above 4000rpm the controller is set (stock value) to run exclusively off the MAF. Its always best practice to tune the VE here too but you have to turn the MAF off the same as you would when tuning below 4000rpm (which I hope your doing as if your not you'll never get it right).
then if i understand you right. after 4000 for WOT i should do a MAF only calibrate and use the PE tablet numbers do get right calibrateing numbers for example if i adjust all collums in PE for 12.6 at WOT i should get the MAF only WOT readings to that and only change in MAF Hz tablet
am i on the right track here....
Baezi
