gains with 2.3" pulley - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 05-27-2006, 03:33 AM   #1
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Default gains with 2.3" pulley

anyone have any real estimates of what a 2.3 pulley would add in the hp or toqure areas?

how much would it shave off a 1/4 miles time alone
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Old 05-27-2006, 07:21 AM   #2
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Each car is slightly different.

What pulley are you running now, stock right?
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Old 05-27-2006, 10:13 AM   #3
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He'* got the stock 2.55".

Nobody has ever dyno'd to determine actual gains. It'* always been based on flow, or ratio'* as compared to the S2.

The 2.2" is widely believed to be UP TO 25hp and 40 ft/lbs. The S1 seems to respond a little better to pulley changes due to the better EM design as compared to S2, and the fact that our SC spins up a bit quicker.

The 2.3" would probably be 15-20hp and 30ish ft/lbs based on this. But again, this would be on a perfectly setup car with mild mods already, and we have nothing concrete to back it up.
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Old 05-29-2006, 10:49 PM   #4
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Boy, I guess I got suckered. The 3800Performance Website said that going to my 3.4 Pulley would gain me 25 to 30 HP and I believe I read my 3.25 would gain me 30 to 35 HP.
I purchased an Thrasher M90 Modular Pulley System from 3800Performance.com.
Sorry, though, I have no idea what a 2.3 Pulley would gain you.
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Old 05-30-2006, 12:17 AM   #5
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Dave, different engine, different supercharger.
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Old 05-31-2006, 12:37 AM   #6
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Thanks for the info and sorry for interrupting.
I feel like I put my foot in my mouth now. Carry on.
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