when does a LS vehicle use ve? why tune ve when using maf? what about other vehicles? is it only when the MAF fails? why is it always recommended to tune VE then MAF.
this seems like a simple question but i haven't been able to find any information
when does a LS vehicle use ve? why tune ve when using maf? what about other vehicles? is it only when the MAF fails? why is it always recommended to tune VE then MAF.
this seems like a simple question but i haven't been able to find any information
2001 3.8 v6 camaro, T5, ford 42lb green top injectors, grand national .63 a/r turbo. 8psi. stock motor, ngk tr6 plugs (one step colder) 91 octane.
2001 4.3 zr2 s10. daily driver, 31" tires, 4x4, cat! and exhaust. looking for mpg.
It's always using the VE. The LS style engine uses dynamic airflow which is both the MAF and the VE combined. In just about every stock tune file in a LS based vehicle there is a dynamic airflow high rpm disable of around 4,000rpm and above that it will use the filtered MAF readings, basically WOT. It uses the MAF there because the MAF is a very accurate sensor. Then every where else it uses a combo of both the VE and MAF to for it's airflow/fueling calculations.
Some vehicles are MAF based only and some are VE based only, just depends on what it is. The 3800's are MAF based with little to no VE table involved. Many fords and dodge applications are MAP based only.
Tuning the VE before the MAF is personal preference most of the time, it doesn't really matter what you try to do first.
2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.
If you don't post your tune and logs when you have questions you aren't helping yourself.
I would just add that the 3800s have the MAF very close to the throttle so the delay between throttle opening (MAP change) and the MAF finding out about it is much less than it is on systems where the MAF is 2-3 feet away. The MAP helps a great deal getting accurate info to make accurate fuel/ignition adjustments during rapid transitions. There are a lot of dynamic situations where two sources of load/flow info info result in better/more accurate decisions by the ECM.
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