Thread: Explain PERF SHIFT please

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  1. #1 Explain PERF SHIFT please 
    SE Level Member kimpossibull's Avatar
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    I've owned my '99Grand Prix for about 10 days now. Got in the car, started her up and noticed in my dash the words PERF SHIFT. First question is "what is PERF SHIFT ?" Why did it appear ?

    Car Info:
    1999 Grand Prix GTP Supercharged 2-Door Coupe

    Note: I just discovered my gear selector has a button on the left side that illuminates
    PERF SHIFT on and off.
    Still need to know the what, why, and how about it please.
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  2. #2 Re: Explain PERF SHIFT please 
    Killa Bee Scottydoggs's Avatar
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    its got a bit higher shift points and i think the torque converter files maybe set to slip a bit more as well. its the go baby go button but with out all the hp lol

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  3. #3 Re: Explain PERF SHIFT please 
    GT Level Member mguzzo's Avatar
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    it changes the shift RPM and line pressure for quicker/firmer shifting.
    I leave mine on all the time to save the transmission, with it off the trans will shift slower by applying less pressure which slips a little more.
    --
    "Silver Bullet" 98 GTP Coupe: Stock, rust free, and broadsided.
    Old '98 GTP Coupe: VS Cam, 3.0, S2IC, 42.5#, TOGs, N*/LQ4, Corsa. it once ran a 13 flat
    Older '98 GTP Sedan: Pullied, rockered, SSIC, etc. Stock 14.33 @ 96.5 / PB: 13.89 @ 101
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  4. #4 Re: Explain PERF SHIFT please 
    GTP Level Member wowitsfast's Avatar
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    My 97 says performance shift on the dic. I leave it on at all times. I never know when I'll have piss off a cocky mustang owner.

    Side note: if your cruising around 40 to 50 mph keep the gear selector in 3rd gear. At about 45 mph your car will shift between 3rd and 4th. Doing so wears on some trans parts.

    My kids love it when in 3rd gear and I mash the gas

    Welcome to the forum and enjoy your new to you coupe!

    Sent from my SM-G981V using Tapatalk
    Just a bunch of junk thrown together http://www.grandprixforums.com/membe...ht=wowitsfasts
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