swish swish with underdrive pulleys

[Mark185]

So I put steeda underdrive pulleys on about a month ago and now when the motor is warm and idling you can hear a "swish swish" noise coming from the belt. Its moderately loud in front of the car.

similar experiences? When I look down on the alternator when the car is running i see the belt move side to side across the pulley.

 

[98 svt]

Sounds like something up there is out of alignment.

 

[Mark185]

here's a video

Yfrog - 0305101614a

the tensioner jumps a little too.. all the pulleys are turning true.

The noise seems like its coming from down low like the crank pulley/ac compressor area though

 

[98 svt]

All the pulleys may turn true, but are they all on the same "plane"? Meaning are you sure they all line up? 1/4" can make a big difference
I can't tell anything in that vid you made of your alternator pulley. lol

 

[Mark185]

found the problem.. took the belt off and spun the alt.. the pulley wobbled like hell. zipped on the stock alt pulley and problem is gone. Great quality steeda.

 

[98 svt]

You sure you didn't put the pulley on backwards?

 

[Cookieman00x]

^^ I was thinking the same thing... Id be will to bet it was on backwards..

 

[na svt]

Hmmm....