Supercharger cog belt being constantly chewed
 

I have a stillen upgraded kit pushing 12.5 psi (cog, impeller). The belt cog is not centered on the idler pulley (pushing more on the pulley towards back of the car not front) and it's eating up cog belts (third belt in 2 weeks). I have it tensioned properly when I install it and as soon as I start the car, the belt shift all the way to the side, and when I drive it, it starts to rub against the side of the pulley and belt goes. Any help guys would be great? such a stupid problem to have especially since the car is running mint beside that. thx you

http://i62.photobucket.com/albums/h1...ps49a7bbe5.jpg

Either the pulley needs to be shimmed or the shaft is bent.

When mine was eating them its wasn't a bent shaft. But it was over tight, Just remember that after the PM . If its over tightened it can, Bend the shaft tho.

I am tightening to the point were I can twist the belt to about 45 degrees with my thumbs, that's how I always done my belts and had no issues. Besides, when I had it less tight, the belt use to slip completely under WOT. I am gone check the shaft and see if I can see any bents. Mike you gave up all together bro? there has to be a solution.

Here another pic. You clearly see its rubbing on the right side of the pulley and it's shredding the belt.

http://i62.photobucket.com/albums/h1...psb56ddea4.jpg

Is it getting most of the damage when you drive the car at WOT to redline? If you drive it for a few days with no hard pulls, does the belt stop shredding?

If so, your bracket may be flexing under WOT, and it causes your pulleys to be out of alignment temporarily. That was one of my problems. JTran made me this support and mine stopped shredding belts.
http://i1182.photobucket.com/albums/...D227555830.jpg

INTERESTING! normal driving belt is fine, if i am reving her hard or driving her hard then it starts to happen. This could be the problem, I am going to drop the car off to my tuner tomorrow and have him check it out and see if that solves the problem. thx alot man

That brace is brilliant!

Op how much whp are you making with your set up?

Hey Sir

When I look at your pictures to me,
I think that the belt does not fit the pulley.

Or the angle is not right 100%.
Verifiable the time.

Greetings
Ivo

Yes, you will need to build a adjustable bracing arm. Osiris, Mine and a few others that have done the COG Swap also had to brace the SC. Ours ran from the side of the SC to a plate we bolted to the inner fender.

No need for a huge support like the one shown above. I used the caliper support from a Harley Springer Front End. I'll see if i still have pic's i can post.

Did you notch the block to clear the pulley.

It looks like he shaved down the lip on the pulley to help it clear the motor. I had to do the same thing. I don't know the clearance differences between the HR and VHR, but I could not cut a notch big enough to clear. So I had to have a custom idler pulley made. It was 2.5" if I remember correctly. JTran did the whole thing, and may still have my entire cog setup. That will give someone a smaller idler to be able to run a 34T/30T cog combo without notching into the motor.

I am looking at the picture you sent me and my supercharger cog pully is much narrower than the one in your picture, I went and measured it and it was 35mm in width (not 50mm) and I doubt that the shop that did the install shaved anything of the engine to get it all to line up. I think I will have to go with the 50mm wider supercharger pulley (2A032-030) and build the brace to help with the flexing and hopefully that does it.

These are the parts I ran are these the same as the ones you have ?

Vortech 4GR116-300 IDLER ASSY 20MM GILMER Chevrolet Corvette

Vortech 2A042-070 COG BELT GATES 20MM 70 TOOTH Infiniti G35

Vortech 4GR032-034 Cog Style Jackshaft Pulley (34 Tooth Count) 1997-2004 Chevrolet Corvette

Vortech 2A033-030 30 Tooth 35mm Supercharger Drive Cog Pulley

Also, look how shiny the lip on your idler pulley is on post #1. I can't tell if it has been shaved down, or if it's making contact somewhere. But, keep a close eye right there, the cog belt can try to walk over it under load. A fix would be a smaller pulley with the lip left intact.