underdrive pulley
#1
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Join Date: Nov 2011
Location: Peru, IN
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underdrive pulley
hey guys, im a ls1 rookie and im learnin the ropes. Could someone explain to me how an underdrive pulley works and gives more power? thanks
#2
11 Second Club
Belt driven accessories take power to turn. By decreasing the diameter of the crank pulley 25% you are effectively reducing the amount of times it has to turn the accessories per revolution of the engine. Doesn't make a huge difference in power but it all adds up.
#4
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they had a deal goin for 210 pulley belts and new bolt i did it in 30 mins and car was 2mph and 1.5 tenths faster in the 1/4 and 1.5 mpg gain. i got the powerbond i believe, if you can get the RIGHT PULLER and do it yourselve it's absolutely worth it. contact Scoggin Dickey Parts Center thats where i got it from. this is on a camaro don't know what platform your got.
#5
10 Second Club
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It is worth it alone. We installed one at the track and did back to back runs some years ago. the car gained just over a tenth. use the asp pulley. it's lighter,great quality and i had one on my ls1 and 402ci with no issues ever. i have ran close to 9's on one with no issues and will run 9's when i get back to the track...i hope. my bud has ran one on his ls1 and 383ci with no issues ever. If it's out of stock,call asp them selves and wait for it. The power bond is easier to get,i got one and sent it back and waited for the asp to get in stock.
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#11
TECH Senior Member
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There is a strong correlation between the ASP and broken timing chains. Here is a link to one, and you will see Katech is noting the same issue. Not trying to dig at anyone, just want to pass on information so you guys can make a decision on your component as I would hate to see you have major issues. (Note that linke below is one of a number of threads on the subject and that Eric D who posted in the thread also works for GM).
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