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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 08-09-2009, 07:07 PM   #1
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Question Smaller pulley

What'* up everyone. I'm new to these forums. I've got a 1999 Bonneville SSEI and am looking for easy ways to increase horsepower and do up my bonnie a little. I was thinking about throwing a smaller pulley on the supercharger. But I want the pros and cons to it.
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Old 08-09-2009, 09:46 PM   #2
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I suggest only dropping to a 3.5" pulley. Going smaller will give you a lot of knock retard and can damage your engine. It'* also a good idea to open up your intake a bit.
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Old 08-09-2009, 11:01 PM   #3
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Hi Aaron;

Welcome to the Bonneville Forum.

Please add your year and trim of your vehicle to your signature line. That way when you start asking questions in other areas of the forum, we all have a better idea on how to assist you. Click on "Quick Links" above, go down to "User Control Panel" and then click on "Edit your Signature" It'* pretty straight forward from there.
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Old 08-10-2009, 02:54 AM   #4
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I did the 3.5 change and felt great power. The 3.5 is the most common size guys run with for a while until there foot requires more speed.
I would suggest going with a Multiple Pulley System (MPS)

That way you can swap out different sizes when needed quickly.
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Old 08-10-2009, 07:33 AM   #5
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Thanks guys. I'll check it out. I heard the 3.5 is the way to go.



99 SSEI Brown
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Old 08-20-2009, 12:06 PM   #6
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What is the stock size?
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Old 08-20-2009, 12:57 PM   #7
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3.8 i believe... lol and on a 3.8L motor... figure that one out
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Old 08-20-2009, 12:58 PM   #8
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What year? On a series 2 it'* 3.8"
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