iam looking for an underdrive crank pulley with underdrive alternator pulley and belts. i made some research.

ASP - belts, underdrive crank and alternator pulley, bolt - $290.00

Whisper - belts, underdrive crank and alternator pulley, bolt - $240.00

anyone in here have any experience with these underdrive pulley, which one is better? any information will help.

 

Get the ASP,I beleive the whisper causedsome KR.Most people have the ASP,as do I.SLP will be coming out with a new one after the start of the year.

 

What is the gain? Why put the underdrive set up on the car and what to expect?

 

Go with the ASP.

Gain is ~1-1.5 MPH in the 1/4.

 

ASP kicks ***.

 

I have the ASP pulley. Between that and the LS6 intake gave me over 10 rwhp.

 

WOW, where did you find a Whisper pulley at? They haven't been produced in a LONG time.

For the record.. Out a few hundred that were made only ONE Whisper pulley was ever returned.

I've heard they maybe coming out with a completely new Whisper pulley in the near future

 

Just go ahead and go with the ASP, its a very proven product and many people have them, I think you should see around 5-7 RWHP with the pulley. Not a bad mod for the money. Good Luck

Wes

 

thanks for info. i will go with ASP

 

I got a little over 9 RWH and just a hair more on torque. It lets you spool up quicker too. ASP is the way to go.

 

I would go with the ARP crank bolt too, it's a little pricey but a high quality bolt and you just torque it to 240 ft lbs and your ready to run no torque angle's to deal with.