All you are doing is moving a point on the scale, the calibration scale didn't change just the point on the scale within the calibration scale.
2005 1500 HD , Custom OS3 SD tune .
2006 Trailblazer
Dinosaurs and Plants gave their lives so that we may drive , long live fossil fuel .
Aren't MAF and VE based on a static air pump volume? Unless you alter that air pump volume in some way the MAF and VE remain the same since the air pump volume hasn't changed. If MAF and VE have such a drastic effect on other parameters maybe we should leave them alone. Then again, maybe all they do is gauge air pump volume.
2005 1500 HD , Custom OS3 SD tune .
2006 Trailblazer
Dinosaurs and Plants gave their lives so that we may drive , long live fossil fuel .
What I'm saying is that like any of the other tables, GM does not always calibrate the VE and/or MAF tables correctly and/or completely.
i.e. don't trust MAF table as being gospel correct from the factory... use a wideband to check it, you will be surprised.
Last edited by joecar; July 26th, 2017 at 09:26 PM.
Remember guys, GM has LTFT and STFTs for a reason, to compensate for variation. MAF and/or VE/VVE may be correct for 10 of their test engines, yet engine production, environment, and so forth all contribute to variation.
You need to calibrate BOTH MAF and VE/VVE when tuning.
~Erik~
2013 Sonic RS Manual - 1.4L I4T E78, tuned, turbo mods, etc.
2008 TrailBlazer SS 3SS AWD Summit White - LS2 E67/T42, bolt ons, suspension, etc.
2002 Chevy TrailBlazer LT 4X4 Summit White - 4.2L I6 P10, lifted, wheels, etc.
I wouldn't agree that the MAF is incorrect just because the WB indicates the AFR is not the same as commanded, the AFR is wrong for some reason, but we can calibrate the MAF to the inconsistency to achieve the commanded AFR, is this best practice thou?
If we look at the terminology "fuel trims", the ECU trims the fuel not the MAF which leaves all the dependent calculations alone, adjust the MAF and those calcs might now be incorrect, however if as I am trying, tune the injector flow correction modifier table B1210 (and it does vary across platforms where as base IFR does not for the same injector), MAF airmass, load, spark, TC, torque calculations/lookups are unaffected
Last edited by Gelf VXR; July 29th, 2017 at 09:42 PM.