Do I need the ALT UD pulley on an M6?

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Dec 10, 2006 | 01:02 AM

bayer-z28

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From: N. Falmouth MA

Do I need the ALT UD pulley on an M6?

I'm getting the UD ASP Crank pulley soon. I've heard that the A4's have charging problems w/o the ALT UD pulley. And what I got from the search, the ALT pulley negates the gains from the UD crank pulley. Is that true?

The ASP pulley kit w/ the ALT pulley is only like $15 extra anyway.

I tried a search too... not much on M6 ALP pulley recommendations.

Dec 10, 2006 | 01:23 AM

BriancWS6

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From: The Garage

I am not positive about the ASP, but I have ran the March UD on an A4 car and also one on my current M6 without the use of an overdrive alternator pulley without any issues.

Dec 10, 2006 | 05:31 AM

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00T\A

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From: NW Houston,TX

Don't waste your money on an alt ud pulley.
The reduction in charging out weighs the gain in hp.
Which is not much anyway

Dec 10, 2006 | 11:58 AM

staringback05

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it would be a good investment, not so much for the power gains but more or less that it will put less strain on your alt.....last time i checked a little pulley was cheaper then a new alt...

Dec 10, 2006 | 01:50 PM

TheBlurLS1

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From: Nederland Texas

I believe he wants to run an OVERDRIVE alternator pulley with his UNDERDRIVE crank pulley to avoid charging issues.

I have no problems with just an ASP underdrive pulley. I've read tons of posts where people have zero problems as well. You don't have 4 12's in the back do you?