foru2nv4

R the pulleys smaller or lighter and more balanced than stock? Is that why u get more horsepower. Let me know which ever or all it is to get more HP. Thanx

Bmitchell373

some are bigger, some are smaller so it will change the ratio for all the accys, lower ratio = dosent spin as fast = less drag.

foru2nv4

So going from stock to KBB underdrive pulleys equal more horsepower?

TOMMY01GT

it spins the accessories slower and requires less engine power to operate them, the result is more power going out the back of the engine vs coming out the front.

mrtstang

Do you mean BBK? IMHO, don't go with anything less than Steeda UDP's. I've heard too many horror stories with other brands.

cliffyk

You do not get any more horsepower, however as Tommy01' said it will reduce the power used to drive the auxiliary devices (water pump, generator, p/s pump, a/c) so as to let that power go to the rear wheels.

At lower engine speeds, cruising or even while accelerating at lower engine speeds (say up to 3500 rpm), the effect is not profound. Their impact is most pronounced at high rev (4k+) hard acceleration, where the peripherals rob the most power. This is why many people say they are not worth the money. If you are not the sort that accelerates briskly past 4000 rpm you may never notice they are there.

I agree 100% with the others, Steeda has the best set all steel.

BBK does have a set with a steel SFI rated crank pulley however the water pump and generator pulleys are aluminum--a horrible material for multi-V belt pulleys.

Avoid all aluminum and "piggy-back" sets as you would your first serious girlfriend's father--110% crap, all of them...

Sash

I have a trick flow very nice set I have to take them out because of my supercharger, let me know if you want them.

cliffyk

The Trick Flow set is another good one, all steel with an SFI rated crank pulley...

TOMMY01GT

Remember there was a water pump and pulley change at some time in 2001...

foru2nv4

I heard they can also cause charging problems