Preformance shift?

I have tried raceing with this on and off, I see no difference, what is this for?

I've never really investigated it, but I heard that it just stays in gear longer. For example(under gentle acceleration):
W/O performance shift: Shifts into second gear at 3000rpms
W/ performance shift: Sfifts into second gear at 3200rpms

[Note: no idea when it would really shift, I made estimates, so they may not be accurate depictions of when the car would actually shift.]

I think that it firms up the shifts so it doesn't try to shift smoothly like it does when it's turned off. I also think it stays in gear a bit longer.

It alters your shift points!

That is what it saies that it does, but it is not noticeable

GM builds these cars and trucks so that you don't notice the shift! Too many people used to complain about the bump during a shift so GM made the electronic transmissions shift to where you don't even notice them.

My car doesn't make difference with Performance Shift Button or without. On the highway, i see the 2nd gear shifts around 5900, and 3rd at 5400 or less... Nothing like before.

Can be my 235/55 R16 the problem?.

Heres the differnce I've noticed:

Under moderate acceleration, with perf. shift off, the rpm's move very little, but the boost gage increases; implying that the engine is accelerating by just a slight increase in rpm, but an increase in compression/power.

with perf. shift on, both rpm's and boost gage increase at approx. the same level.

(I could be wrong, its just the only thing I could come up with :smile: )

Thats a good theory, I'll drive my cousin's regal GS sometime and see that for myself.

Perf. Shift affects:
Transmission Line Pressure - Increases it
Moves your shift points up slightly

of course if you get a DHP PCM http://www.digitalhorsepowerinc.com/ you will see a bit more in perf. shift.

Fuel Table adjustments
Larger increase in Transmission fluid pressure
Skip shifts 3:1, 4:2
Shift Points expanded even further up the RPMs

my best friend's got a 92 saturn SL2 n its got the factory performance chip n he's got the performance shift switch too...except in his you can tell a big difference...at WOT, with the performance shift on, it shifts at the red line, about 6K...without it on, it shifts at like 5K