what do pulleys really do.
Contributing Member
Joined: Feb 2002
Posts: 1,841
From: NY
If you're talking about the greddy pulley set all they really do is look nice from what I've read. crank pulleys might make a difference. but a flywheel, or even a driveshaft, I'm sure would be a much more noticable mod.
Registered User
Joined: Feb 2005
Posts: 18
From: texas
Underdrive pulley systems increase an engine's horsepower by reducing the power required to drive the external engine accessories. By replacing factory pulleys with carefully resized units, the accessories are slowed enough so that their performance does not suffer, but just enough so that more horsepower is sent to the wheels and put to the ground. Where horsepower should be!
there are a few paragraphs there describing pulleys, their function, and replacement options. check out the website for the rest of the info.
Registered User
Joined: Sep 2004
Posts: 240
From: Everywhere
Only one that is worth changing is your crank pulley. Changing to an aftermarket one will lighten the rotating mass on the crank considerably. Thus giving you quicker revs and at the same time freeing up some power. But I personally think its a waste to try and change any other pulley. Maybe for the bling but thats it.
Registered User
Joined: Feb 2005
Posts: 18
From: texas
i agree with TWAN, swapping to a resized crank pulley is what will free up power the most 
the other accessory pulleys will also yield some power but the results are very minimal compared to the crank pulley.
most people do accessories just for the bling bling effect
the other accessory pulleys will also yield some power but the results are very minimal compared to the crank pulley.
most people do accessories just for the bling bling effect
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