ZR1 PE table - whats going on here??

[ayousef]

can someone explain why does the ZR1 PE table look so weird? I can feel the power fluctuate just like those lines, I dont know if its me but this doesnt look right.

attached.

[Bill@HPTuners]

ask GM they made it.

[ayousef]

ask GM they made it.

What do you personally think though?

ps. this is not the only table that drives me nuts, even the IAT vs spark table gets me all confused!!

[Bill@HPTuners]

i think they do what they do to pass emissions, meet mpg goals, etc. not to tune it so that pit will make the most hp/tq on a dyno...thats not what their paid to do

[ayousef]

i think they do what they do to pass emissions, meet mpg goals, etc. not to tune it so that pit will make the most hp/tq on a dyno...thats not what their paid to do

I can understand if thats what they are trying to do, especially since the throttle input PE enable is so low, getting into PE mode would make up a big part of even a slow cruise.

I would have expected however, with the instant boost at any rpm, at least a rich mixture at low-rpms, and a nice sloping PE table to a leaner say ~11ish AFR throughout the rest of the RPM band.

This looks more like a tune ive seen a while back of a raped PE table

Ill assume there is a purpose this looks like this, but nothing that I know, and would be nice for the tuners to step in and comment based on what they think is the reason this looks like this.

[Bill@HPTuners]

Greg B may know as he does calibration work for GM(not saying he did it on this particular vehicle though)

[ayousef]

Greg B may know as he does calibration work for GM(not saying he did it on this particular vehicle though)

You just reminded me I had to contact Greg myself, so I did. Time to take the guess work out of this one.

[BMBSALES]

i see this on others. my guess is to adjust fuel to offset added spark and knock. as soon as i flatlined pe on mine, midrange burst lit up like a x-mas tree on histo.

[Redline MS]

GM does this as Bill stated for items like emissions and cat temp control. They will add fuel to control the cat temp under WOT conditions. Believe it or not it is done for a purpose!

Howard