ezjarecki

looking how to tune the ve table for a 2010 cobalt 2.2 lap? what is the difference between ve lo altd and ve hi altd? how are they tuned for boost? it is different then a normal ve table like on a ls motor.

Slowbalt2000

iTrader: (1)

Also interested in this if we can get a discussion going. Maf stuff seems pretty easy to change but ve seems a bit more tricky.

ezjarecki

also my table is rpm and throttle position and what do these numbers stand for?

Slowbalt2000

iTrader: (1)

Probably gm ve

Jesse

iTrader: (4)

The latest HPTuners 2.25 beta supposedly has VVE(virtual VE) variables working now. It has nothing to do with the reversion tables that you are looking at and have everything to do with the VE variables in the "Speed Density" tab. You must either email support at HPTuners for the beta, or download the bluecat tool and learn how to use it and implement it into your tune, which requires frustrating amounts of of copy/paste.

Here's the rundown on how VVE works: http://www.hptuners.com/forum/showth...ll=1#post58504

Slowbalt2000

iTrader: (1)

So youre tuning the coefficients rather than the reversion tables? Whats the difference?

Jesse

iTrader: (4)

The coefficients are what actually affect the VE. They factor MAP, RPM, RPM squared, and a ton of other crap. Reversion tables are for just that. Reversion. They don't affect your airflow or fueling at all. A prominent V8 tuner on HPT forums says:

Slowbalt2000

iTrader: (1)

Im really happy this discussion started. We need more base model tuning threads. I still havent wrapped my head around ve tuning.

Slowbalt2000

iTrader: (1)

Jesse do you wanna post up like a mini how to on the basics of this? I would greatly appreciate it.

Jesse

iTrader: (4)

Yes. Are you talking about how to use the bluecat tool or how to log/tune virtual VE? It may take me a while to write since I work odd shifts this week. Maybe a couple days. Saturday night at the latest.

Slowbalt2000

iTrader: (1)

Which do you prefer? I think virtual VE would be the best way