Ok so been searching on ebay and i see v6 underdrive pulleys and v8 underdrive pulleys. Dont really see a difference. so the question is will v8 underdrive pulleys fit v6's?

 

No they wont fit. Also, the UD pulley out on our cars shows no gain. I would go PHP Alternator Pulley, Scrming dyno'd it for 3-5HP gain. I have it installed on my car as well.

 

is a 3-5 hp gain really worth it tho?

 

When you are NA, every little bit helps. Its 170 bucks, up to you really.

 

I've been holding off on underdrive pulleys just because it doesn't seem quite worth it. The PHP alternator pulley is the way to go though, instead of the over-priced ASP pulley. If I end up staying NA for another year, then they'll up their place in my list.

 

(possibly) foolish question... are these fabled PHP alternator pullies still available to purchase? A quick search on Google yielded nothing.

--=K

 

You have to call them directly to order it, that is what I did.

 

Aw man, I hate using phones. Internet ftw.

 

You know that is not entirely true. Doug dyno'd the ASP UD pulley on my 05 with an auto. The pulley showed a 4 RWHP gain and about 6 lb ft of torque. The UD pulley also reduces rotational mass , which I'm really surprised all you racers out there haven't realized, given all the chatter about aluminum drive shafts and the weight savings on that end of the drive train.The ASP UDP has been dismissed without so much as a run down the track. By the way the pulley is still on my car, I still say the engine revs and responds quicker. with the pulley installed. As I have stated before , I have had NO problems with the pulley, no charging problems or cooling problems, and this summer is HOT down here in Bama the A/C works fine. The pulley is a little expensive, but it is NOT snake oil.

 

Well I stand corrected, I feel bad now for posting it showed no gains. I thought that is what the write up said. I will go back and search on it. You have my apologies man.