2000WS6ICK

iTrader: (2)

For the guys who are running underdrive pulleys, Are you running an overdrive pulley on your Alternator? Do you have any charging issues? Its going on my 2000 Trans Am, WS6, A4.

Ericbigmac83

iTrader: (19)

With M6's its usually not needed. the A4's its more useful

01ssreda4

iTrader: (96)

i got an A4 and i didn't order the alt pulley. my idle is slightly higher from a cam tune though and i have no power hungry electrical accs either. i will let you know my results bc my UD is still on the table in the shop. ha ha.

2000WS6ICK

iTrader: (2)

I have no power hungry stuff either, I even removed the A/C. The car is not a DD and see's track only. I have HPT so I can idle it down a little. How about cooling? Does a underdrive pulley affect cooling?

ajsfirehawk

iTrader: (4)

Your water pump is going to spin slower with the under drives. They are what, a 10% or 15% under drive? I couldn't say if that is going to reduce the flow so much that the system can't recover. On your signature I don't see any reference to 160 degree thermostat or tuning that would lower the cooling fan settings. You say track only but do you trailer to the track? If you do trailer it, I wouldn't worry about it. If you drive to the track...45 minutes of stop and go with a 100 degree day, hard to say.

2000WS6ICK

iTrader: (2)

Its a 25% underdrive pulley. Yes I have a 160 thermostat and my fans are set lower. Theres not enough room for me to list everything on my sign. Thanks for your input.

omcar

iTrader: (10)

I just have the ASP crank pulley..

rob scott

iTrader: (14)

just wondering why does it matter if its a m6 or a4 with the pulley?

JoeyD

iTrader: (20)

I've used an SLP 25% underdrive pulley on my '06 GTO for over 36k without one issue. No alternator pulley change. It's an A4, has a 160 t-stat, stock water pump, fans set to come on at lower temp, sees about 75 passes at the track a year.

HMERacing

I ran a ASP on my SS for many miles with absolutely no issues whatsoever. I DID NOT have the over drive pulleys either.

2000WS6ICK

iTrader: (2)

Is yours an A4 or M6?

Arc00TA

iTrader: (17)

The A4 has a lower idle, especially when in gear. This leave less room for play with your accessories.

HMERacing

It was an automatic with a yank st3500 stall

HTX

iTrader: (1)

i had an asp pully as well for 2 years never had charging problems.

JBIRD02

iTrader: (4)

powerbond pulley here w/ 20k miles, no problems so far.

69_YENKO

iTrader: (16)

I ordered the alt pulley with mine and never installed it. it charged fine without it on my cammed, stalled, auto.

DrkPhx

iTrader: (15)

I've used the same ASP pulley for 5 years without any charging problems. It's a A4 car.

nemss1

i have an A4 and plan on getting both the ASP underdrive crank and underdrive alt. pulleys. i removed my a/c and powersteering so my question is should i have any charging probs with both the underdrive crank and alt pulleys? considering the only accessory im turning besides the alt is the waterpump