LS2 MAP to MAF transition point (RPM)?

[Scooter70]

I've always heard that LS1/6s use the MAP/VE for airflow calculation below 4k RPM and then use the MAF after that point. I assume that there's a range where it uses some blend of the two. Does the LS2 (E40) also switch around 4k? Can anyone explain the transition? I have some things going on at high load (99kPa) and 2000-4000RPM and want to make sure I'm addressing it correctly.

Thanks,
Matt

[Bill@HPTuners]

Engine-airflow-dynamic airflow. I think its like 3600 rpms in many LS2's

[Scooter70]

Thanks Bill. I just checked and it's 3600 for my LS2 GTO. That doesn't explain the lean condition that I'm seeing 2000-3600 at high MAP. It wasn't there in SD but once I enabled MAF, it's there.

[BBA]

Sounds like you need to figure out the best values for maf settings that won't totally negate the VE calculated values.

The transition RPM basically moves from a combined VE table plus MAF calculation at low rpm's to a MAF only calculation at high rpm's.

This kind of explains how it works and how to tune for the cam:

http://www.ls1tech.com/forums/attach...6&d=1113173853