{B8001} Normal VE Calculation

[Redline Motorsports]

What are the values in the RPM base and MAP based? How are they derived?

[GMPX]

It might seem like a dumb response, but they are just raw numbers, they really aren't any specific unit.
The base values influence the 'tilt' of the VE curve as the RPM (or MAP) goes up or down.

So a bigger value in the RPM Base will cause the VE numbers to increase as RPM goes up.
The tough part with all this is trying to figure it all out based on stock GM calibrations. It seems each calibration team had their own way of doing things, so looking at say the L92 V8, the MAP base in Zone 30 is 1.068398, yet in a 3.9L V6 you have a MASSIVE number like 143.150314. But there is the problem, cut/paste the whole Zone 30 row into the Excel sheet and the final number ends up about the same

Cheers,
Ross

[Acer]

Hi Ross,

Thanks for the response but I am not logging an E38 or E67 PCM. Just trying to convert the E38 VE Formulas/Coefficients into a conventional VE table as a function of MAP & RPM. This requires an understanding of what the variables behind the Operating Zone #'s are. Guess the Operating Zone # would be a function of the usual MAP, RPM but perhaps other things?? Any thoughts/comments out there?

Thanks,

Acer

[GMPX]

Perhaps this pdf I whipped up might help explain it (hope I checked it thorough enough ).

Cheers,
Ross

P.S - Imperial users, it's time to learn kPa for this stuff

[TuneMaster]

I was logging on the dyno yesterday to work this out but you have just made it alot easier. Thank's heaps Ross.

[Acer]

Thanks a lot Ross & looks plenty thorough to me at this stage .

Cheers,

Acer