Simon1

What about the belt OP?

What brand? Is it old?

moosestang

With the first generation whipple and 3.375 inch pulley, along with 100mm idler pulley and the stock 90mm idler on the stock tensioner, I have the sliding tensioner almost all the way down, so there is no way I could move to a smaller pulley without slipping. These belts stretch after only a few miles.

You can only put so much tension on the stock belt before it snaps, that's why the thumprrr uses a stock spring. It's not really the tension that's the problem, it's the belt stretching and the belt being a little to long in the first place. The stock tensioner ends up bending from power shifting, that's why you see the frankentensioner or thumprr being sold.

If I had a built motor, I'd just pay the $1,000 for the steeda belt drive.

So what size pulley are you using? Is this a 1st gen whipple?

moosestang

This looks like the cheapest, easiest option.

http://www.lethalperformance.com/bgg...een-roush.html

Simon1

Tensioners usually flex and cause the issues. I have found that after a few miles of driiving I can adjust my pulley.down a notch on the KB. @ 15-16 psi, I get little to no slip with a 6 rib belt.

moosestang

Is the KB belt the same length?

I see it is 122.3 inches. The stock whipple belt is 124.7 with the 3.375 inch pulley. I wonder if the 122.3 inch belt for the kb will work on the whipple.

Diabolical!

Don't see why not if you're running a smaller pulley and a 6 rib setup. Might have to change the tensioner pulley back to stock size from the one that comes with the Whipple, but should still give better overall belt wrap.

danzcool

You've got three smooth idler pulleys you can change out to make it work, plus the one below the adjustable whipple idler gives better clearance if you go smaller.

Diabolical!

Actually, now that I think of it, we've got the sliding whipple idler as well.

908ssp

Frankenstensioner. 19 psi KB it works.

Simon1

I think mine is 122.3, not sure. The KB has a billet bracket with 5-6 adjustment holes for a small pulley. If you belt is too long or loosen up, you can tighten it down.

I really want an 8 rib set up with an overdrive crank. I can use the same blower.pulley and make a few more psi.

KB says that @ 15-16 psi I am at the limit for the 6 rib.