Reason for PE delay to 4800 RPM?

[Rockets]

Anyone know why this is? I'm working on our 03 Trailblazer I6. I have recorded with the WBO2 and the stock O2 and watched it wait until 4800 RPM to hit PE mode, even when I goto WOT from a dead stop. This appears to be causing a lean spot and KR, which you can see goes away when PE mode comes on, and the WB reports going from 14.7 to 11.5.

Before I go drop this in the table to like 2000 RPM, can anyone tell me why this is set so high from the factory? Emissions?

Thanks..
Bob

[S2H]

its one of GM's ways of saving gas...you can set it to 0 as many of us do with no issues

[Rockets]

thanks!

[MMGT1]

My 3400 would go as long as 18 sec(timed) before pe would kick. Now it's instant....THANK'S HP!!!!

[Sp00ner]

Oddly enoguh, on the Ion Redline they have it at like 3600 rpms for the stock tune, and when they upgrade the cars to the 'Stage 1 or 2' tunes, it moves the PE up to 4800...