performance shift. vs regular shift. - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 11-19-2007, 10:15 AM   #1
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Default performance shift. vs regular shift.

Do these two buttons really make a difference.
In estimating my fuel consumption , i filled the tank and drove till gas warning came on.
under normal shift. approx 400 km.

did the same thing , filled tank (till hose shut off) chose performance shift and got almost 100 km less.

same basic driving, back and forth from work , occasional trip round town no long distance very little highway..

i will leave it on normal shift ,,just for the mileage because i cant believe i got soo much less mileage on performance shift.
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Old 11-19-2007, 10:23 AM   #2
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Stock it should only be a difference at WOT of about a 200rpm difference from where normal shift occurs.

Most can't notice the difference.
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Old 11-19-2007, 12:33 PM   #3
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It seems to make quite a difference on my 92, part and full throttle.
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Old 11-19-2007, 12:36 PM   #4
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According to my tach, Normal at WOT is 5000-5100, and Performance shift is 5200-5300. I think 5300 is the max shift point.
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Old 11-19-2007, 12:47 PM   #5
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Quote:
Originally Posted by Bonneville92V688
According to my tach, Normal at WOT is 5000-5100, and Performance shift is 5200-5300. I think 5300 is the max shift point.
For 91-93 L67'*, yes. 94/95 shift a tad higher (which is what the topic author has).
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