Is it worth putting underdrive pulleys on a 01' WS6 and if so what kind of hp gains can I expect?

 

Yes it is worth it. I gained 9rwhp and 0.15 secs at the track.

 

i think its worth it. i havent been to the track yet, but my car feels a little quicker and smoother.

 

Who makes the "best" one, and where is the cheapest place to buy them?

 

March would be my choice.

 

Will it work for an A4. Ive heard there can be power problems with the accessories with an underdrive pulley.

 

"Overdrive" pulley will solve the problem for A4`s. th OD pulley job is to bring back the alternator speed to its previous stock levels and this will solve the problems in Autos.

 

Very well worth the money.

 

I have SLP's pulley and it is a very nice piece. It weighs a lot less than the stock pulley which means less strain on your engine during high revs. I noticed a difference.

 

I just have the underdrive pulley for the crank for my A4. I have not had any charging problems in the 5 years that I have had it. Right now, I have a ~800 watt stereo system and still have the stock alt pulley. You will be fine.

 

yeah, how are those slp pulley. i hear they are supposed to be really good. i know some of us are skeptical of slp stuff and all. but i hear their pulley was made pretty good.

 

Yes, simply put...you will see a 12-15 HP gain and a 2-3 MPG gain. It's basically a smaller pulley that reduces the amount of power required to turn the rest of the accessories, much like shifting to a lower gear.

 

Thank you to everyone for your insite. Looks like I'm buying a pulley.

 

What material is the march made out of and what would make it better than an ASP pulley. Would the gains be more or less than an ASP?

 

I've never had a problem with SLP products and believe me, I have purchased a lot of them. The SLP pulley is very nice and a steal at $230. You do have to purchase two seperate belts from Gates. No big deal though! It took me about two hours to instal the pulley in my driveway along with SLP's high capacity radiator. Two nice mods to do at the same time!

 

All gains about the same. My vote is for the SLP w/ the higher walls to help prevent the belt toss.

 

my vote is also for SLP because it comes in a nice aluminum so it is nice looking.. and the walls.... also no trouble what so ever for the install and it has nice degree prints on it!1

 

Not trying to highjack this thread, but is anyone using te gatorback belt??

 

*raises hand*

 

ive got gatorbacks on the gtp and i like em. when i get my slp underdrive im goin with gatorbacks on the ss