2.5" pulley - 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 12-14-2004, 12:23 AM   #1
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Default 2.5" pulley

Hey does anybody know if i will run into any problems with my supercharger, if i replace the stock pulley with a 2.5". If my car has 150,00 should i worry abou damaging the bearings in the supercharger, anybody please reply back thanks
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Old 12-14-2004, 12:39 AM   #2
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when changing pulley sizes engine knock should be ur main concern.
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Old 12-14-2004, 01:11 AM   #3
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A 2.5" should not hurt you. What year is your car? The 92-93 pulley is 2.55" not really worth the time to put a .05 smaller pulley on if you have a 92-93. if you have anything else then its worth it You should have some mods to back up a pulley though. the first is to have a 180* thermo
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Old 12-14-2004, 02:08 AM   #4
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Quote:
Originally Posted by 1993 SLE
A 2.5" should not hurt you. What year is your car? The 92-93 pulley is 2.55" not really worth the time to put a .05 smaller pulley on if you have a 92-93. if you have anything else then its worth it You should have some mods to back up a pulley though. the first is to have a 180* thermo

A cold air intake, 180* stat....and exhaust helps a lot too....Just a better muffler is more then plenty....a lot of us around here love the flowmaster and magnaflow mufflers......After those 3 things you're more than ready to do a pulley. When you do your pulley can I have your OEM???? I really need it!!!!
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Old 12-14-2004, 12:23 PM   #5
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Default 2.5" pulley

Yeah Imy baby is a 95 ssei, I have a cold air intake, 2.5' stainless steel exhuast with a flowmaster muffler. On the 95s the supercharger pulley is 3" and a little bit, so if i get a 2.5" do you think I will notice a difference?
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Old 12-14-2004, 12:48 PM   #6
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yes you will notice a difference from the 3 to the 2.5. you will want to install the 180* thermo in addition to your current mods

coul you put your year and (95) and trim level (SSEi) in your signature so we can help you better
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Old 12-14-2004, 08:10 PM   #7
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150,000 miles shouldnt hurt, ssei95 has mileage close to that and he is runnin the 2.5" pulley with no problems. your stock pulley size is actually 2.85" you should notice a nice gain, ill be puttin on a smaller pulley soon myself
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Old 12-16-2004, 07:16 AM   #8
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Quote:
Originally Posted by jgs11
150,000 miles shouldnt hurt, ssei95 has mileage close to that and he is runnin the 2.5" pulley with no problems. your stock pulley size is actually 2.85" you should notice a nice gain, ill be puttin on a smaller pulley soon myself
Yup. I have about 135,xxx on her now and I did nptice a nice difference once I put on the 3.5. I'm sure my exhaust and intake have helped out a bit too.
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