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Old 11-04-2009, 04:09 AM   #1
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Default Need advice about pulley replacement

So i want to make my bonneville ssei abit quicker by swapping the pulley and I just wanted to know how much boost the eaton m90 supercharger could handle
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Old 11-04-2009, 05:35 AM   #2
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Hi and welcome to the forum!! the question would be how much boost your engine could take lol remember swaping the pulley to lower sizes gives you more boost but your engine would need other mods if i am correct to handle or take that kind of boost.. the experts on this could help you out today when they get online, ill be gladly to help you but i dont have to much knowledge just the basics
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Old 11-04-2009, 08:15 AM   #3
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When you go with a smaller pulley you should have a few supporting mods in place. Colder spark plugs, Opened up intake and exhaust any thing to drop the temp of the air and help your your engine run cooler and reduce KR. I have a 3.4" pulley with 11 lbs of boost and have KR numbers that aren't bad. I think most run a 3.5 or 3.6 pulley and are happy. Just remember to support the pulley with what it needs for air
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Old 11-04-2009, 08:19 AM   #4
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I don't suggest a pulley smaller then a 3.5" unless your scanning for KR and have other supporting mods such as a open exhaust. PEMs, Plog, headers, rockers, cam. If you start to get KR you risk damaging your engine.
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Old 11-04-2009, 11:31 AM   #5
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Paul 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.

I'm running currently a 3.5 pulley with a few mod - open exhaust, CAI, 180 T-stat, colder plugs.
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Old 11-04-2009, 03:42 PM   #6
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Thank you all for the great advice! I
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