Generation IV External Engine - Underdrive Pulley
05-12-2009, 11:03 PM
I have been looking into an underdrive pulley for my 02 Z28 and i was hoping to get some feedback and opinions. How much time did you pick up if any? Is it worth the money? What is a good brand? Is it an easy install? ext.
05-15-2009, 07:02 AM
i was looking into that as well...
05-15-2009, 09:20 AM
I got mine from Scoggin Dickey. I hope I spelled that right... I got the Powerbond 25%, came with two belts and an ARP crank bolt. Very nice and the shipping was free at the time.
05-15-2009, 10:32 AM
we still have the kits avail at a good price, just no longer free shipping and the belts cost now, but they are still on the site. they run like $260 with the balancer, reusable arp style bolt, and the correct belts.
the one for the fbody will be kpbu1480ss25 for the 25% ud kit.
i have seen very good dyno results using this setup, and really no adverse problems from installing it unless you have an abnormally high elec demand on the car
05-19-2009, 12:44 AM
My suggestion is to do it while doing a cam swap if you plan on doing a cam. Install is a little PITA otherwise, because you will need just the right puller, and have very little room to pull it (unless you remove the fans - you might be able to get crafty and lift the radiator far enough out of the way).
If not, go for it. It's not a seat-of-the-pants difference, but every little bit adds up. I never had any cooling issues, and the only time the voltage dipped was at idle surges (big cam/heads/m6 car)
Also, keep in mind that if you have an M6 and/or plan on putting a stroker in there, harmonics become an issue. At that point, a high end damper (ATI, etc) makes much more sense.
05-19-2009, 01:29 AM
The whole time I was looking/asking around about them while I was doing my build I kept hearing that you could expect to see 8-10RWHP, which is about the same as a ported throttle body. You can definately tell a big difference visually and weight wise. I cant tell how much it made a difference cause so much was added while the motor was out of the car. I got my ASP from Vengeance. Came with a new GM crank bolt (Ron said he didn't like the ARP because of the washer it uses) and I paid to get the belts. As far as I seen they had the best price on the ASP. They also have the powerbond for cheaper. As far as pulleys go I've always heard them ranked ATI ,ASP, SLP, Powerbond.
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