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Old 09-14-2010, 11:20 AM   #1
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Default Bonneville SSEI

I've got a 2000 Bonneville SSEI with alittle over 138,000 miles. I was wondering what the stock Pulley size is on the Supercharger? Also what size Pulley can I add without making any major performance enhancements to the car. I just want alittle extra pop outta the car.
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Old 09-14-2010, 11:28 AM   #2
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i beleive you can go to a 3.5 inch without further modding but from what ive heard it really may not be worth it to do just a pulley.Please dont quote me on this this is what ive gatherd it may not all be accurate(sorry if it isnt)
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Old 09-14-2010, 11:38 AM   #3
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Stock pulley is 3.8" And I really don't suggest going lower with out supporting mods. The 2000+ tend to run lean and I've seen KR come up much sooner on the 2000+ You should be able to run a 3.6" safely, but every car is different. A 3.5" may also be OK, but without scanning for KR there is no way to say for sure.
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Old 09-14-2010, 11:41 AM   #4
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Many people say you can drop to a 3.5 without any extra mods but whats the point if you cant get the full potential out of your mod. A cold air intake, and colder plugs along with a good tune will make that 3.5 worth your your while. Do some digging around the forum their are TONS of threads concerning this very mod.
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Old 09-14-2010, 11:44 AM   #5
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What kind of scanner can be used to scan for KR? Also what should the maximum boost be with a stock 3.8 pulley?
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Old 09-14-2010, 11:50 AM   #6
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Dropping to a 3.5" pulley will get you around 20hp or so, but ya, 1 range colder on the plugs, open up the intake a bit. Headers or a Plog is your best bet.

As for the scanner, it needs to have enhanced GM scanning to read KR. Most scanners do not have this. A aeroforce scan gauge is a good option.
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Old 09-14-2010, 11:53 AM   #7
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Now would I be able to order a GTP air intake? would that work on my Bonneville?
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Old 09-14-2010, 11:55 AM   #8
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Might take some modification, not a big deal. A custom intake is easy as well. Move the PCM over, and run a flex tube in to the wheel well with a K&N filter. There'* a write up or two in tech info about that.
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Old 09-14-2010, 01:38 PM   #9
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whats the maximum boost for a stock 3.8 pulley?
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Old 09-14-2010, 02:15 PM   #10
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I kno I can get about 6 or 7 psi out of my 3.8, 8psi on a cold day.
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