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How many ribs is the standard a/c p/s belt? 3 or 4 (I thought it was 3)...

Because if the 4 rib is too wide for the a/c p/s pulleys i would suspect it may jump off.

Also, check both your supercharger and the p/s pump to make sure the pulleys are vertical with each other. My p/s pump was a little off vertical and I had really bad belt noises until i fixed it.

I looked down and saw the belt wasn't quite straight.
My p/s pump bracket was loose.

Which tensioner arrangement do you have? They now sell a very different (and expensive) version, probably to fix the issues of the original. You can buy the new arrangement separately.

M

Maybe post a pic and someone may know the fix?

This was raised on the SOT forum <http://www.sotforum.com/forums/index.php>

Problem is they seem to have discontinued the forum, but the old threads appear to be accessable from the bottom of this page:
http://www.sotforum.com/forums/showthre ... 0#post9330

Or via search at:
http://www.sotforum.com/forums/search.php

From memory the suggested fixes for a jumping belt were either alignment &/or tension related, but some also suggested swapping to the ridged tensioner pullies.

I used the Track dog tensioner on my original install and had no problems at all. After replacing the nose bearings (as you do when you change the oil, the unit was second-hand and used GM supercharger oil), I placed a high tensile washer on the nose side of the pulley to improve the clamp area on the pulley, so the supercharger had to move back 2.5mm or so to realign the belt, (yes the pulley came loose, ) it’s now installed with loctite bearing and gear retaining compound . Seems ok so far only dríven 300k so far.
So I can recommend the Track dog tensioner.