Performance problem?? - 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 09-01-2007, 01:25 AM   #1
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Default Performance problem??

Well i'm a new owner and have been reading up a lot on my car. I have a 1992 ssei and as to my knowledge and to my dad whos a mechanic there is absolutely nothing wrong with it. It feels so sluggish to me though. It has 106k miles and holds boost at ~8 psi. from a dead stop i barely chirp my tires. Idk if its because i have brand new falken performance tires and there sticky or mayb its all in my head. but i'm just wondering.
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Old 09-01-2007, 02:17 PM   #2
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Moved to Mechanical so you can get better exposier


Did you do all the regular tune up stuff? (plugs, wires, filters,ect...)

What gas are you pumping? because it should NOT be anything less then 91 (higher the better)

Also the tires can have an affect on Spinning them, but should not affect acceleration
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Old 09-02-2007, 02:20 AM   #3
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I think I understand that the SC engine has a lower compression ratio than the NA; compression is reduced from 9.4:1 in the L36 to 8.5:1 for the L67.

Is this correct? Why is it so if it is true?
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Old 09-02-2007, 11:15 AM   #4
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supercharged versions of engines generally have lower compression ratios because the supercharger rams in extra air into the combustion chamber, thus allowing more fuel to be injected. This mixture is more dense than the NA engine'* mixture density since the supercharger rams it at 8psi,9psi,w/e... thus a lower compression ratio is needed. If you ran an NA compression ratio on a supercharged engine, then there would be so much compression in the cylinder due to both the stroke and extra psi from the SC, that ( i would assume) something would blow.
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Old 09-02-2007, 11:18 AM   #5
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Compression isn't an issue. The 91-94 L27 and 91-95 L67 (and later L67'*) are all 8.5:1 compression.
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Old 09-02-2007, 11:25 AM   #6
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i thought the NA'* were 9.4 CR.
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Old 09-02-2007, 12:59 PM   #7
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Only the 95 and newer L36.

The Series 1 cars were all the same. 8.5:1
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Old 09-02-2007, 02:56 PM   #8
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Can we please get this one back on topic, the man has an issue, and compression isnt the answer
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Old 09-02-2007, 06:58 PM   #9
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VERY good idea. For the record, I posted my correction so that people can get their facts in order. Even though compression has absolutely nothing to do with this problem.
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Old 09-03-2007, 01:57 AM   #10
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idk im pretty sure its all in my head, i just did a tranny flush and oil change. as soon as i get some money im going to buy new plugs but ill have some pics up for you guys soon and thanks for the help.
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