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#2
04-24-2003, 10:30 PM
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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.] 
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#3
05-21-2003, 09:06 AM
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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.
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1991 Mustang GT vert...1 5/8 shorty headers, offroad h-pipe, flowmaster mufflers, CAI, ported and polished lower manifold, 3.73's, Tremec 3550, King Cobra clutch, Pro 5.0 shifter, electric fan, subframe connectors, Lakewood upper control arms....A LOT more to come.....if only money grew on trees...14.2@95 mph 221 rwhp and 278 rwtq
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#6
05-22-2003, 09:01 PM
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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.
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#7
05-18-2004, 04:36 AM
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Re: Preformance shift?
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?.
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RED 1999 Grand Am GT - RAM AIR V6 H.O., 4drs, sunroof, and more!
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#8
05-18-2004, 08:30 AM
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Re: Preformance shift?
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  )
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#10
05-18-2004, 02:52 PM
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Re: Preformance shift?
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
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#11
05-19-2004, 09:57 AM
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Re: Preformance shift?
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
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