i just wanted to know whose running with underdrive pulleys and how much difference was there before and after the pulleys, performance wise or any problems. im looking to buy some but need some help before. thank you

 

i have one along with the overdrive pulley, the charge stays normal at 800 rpms with the lights, fans, and big stereo on. as for performance i dident notice much because i have a lot of other bolt ons, but maybe if it was my first mod i would have noticed more.

 

When I installed mine, it seem like the engine rev easier

 

IMO a total waste of money. No improvement at all. Car is bracket raced a lot.

 

thing is only suppose to give u a couple horses...
i did mine at the same time as headers and catback so i dont know what it really did..
Headers let the car rev quicker too so i cant say if the pulley helped but thinking logically it should help..

Your not going to feel the power gain... but if your looking for every little bit of power then get it.

 

How does 0.7hp sound?

http://www.ws6.com/mod-2.htm

On the LT1 engine, the airpump is electric and the waterpump is driven off the cam. There isn't a whole lot of accessories driven by the belt and most UD pulley come with alternator overdrive pulleys to keep the charging system up. A unengaged A/C compressor takes less than 1 hp to spin and the PS pump doesn't produce a load until you start to turn the wheel.

I still put one on anyway because I've run out of bolt-ons to put on.

 

There was also a 4.9 ft #s of torque gain looks like across the board.

 

I got some from slp definitly get the od for the alt. I didn't really tell any hp improvement by the seat of the pant's method of testing.

 

gotts to look at the average hp and the torque gain too...

Its a worthwhile mod as long as u do it with other things like TB bypass, air foil, 1le drive shaft etc.. the little stuff adds up..