sawyer

I had the same dilema. Since Adam was building my car and it was cheaper I went with the frankentensioner. You can't see the tensioner anyway and I have never had an issue with belts. The thuprrr is a nice piece for sure.

doc0075579

Silly question, what exactly does the thumprrr do and why do we need it?

blackS197

Thats gonna probably one of my next mods. I get squeak from the belt or one of the pulleys at start up. Once the car warms up it goes away though. Either way its pretty annoying and embarassing, especially when theres people next to my car.

teedub

I have had mine on for about 2 months now and my city MPG has fallen from 17-18 to 11-12. I can understand that a bit becuase I have a heavy right foot. But this last weekend i went up to Orlando and drove like I always do and my highway MPG fell from 24-25 to 17-18. Anyone else have their milage drop off that much?

blackS197

Well i havent kept track but its not that bad if i dont boost and just drive normally. I notice my needle drop quick when I take my car through wot couple times throughout the day. Your gas mileage drop seems normal i guess since you have a heavy foot.

teedub

the city MPG drop I can understand but not the highway. I put the cruise on 75 and drove up I-75 and I-4 to Orlando and I got around 7 MPG less.

blackS197

Hey guys im getting alot of dust that sits on the whipple pulley, im pretty sure its from my belt. Is my belt rubbing? slipping?

hammeron

i'm thinking just normal belt dust
black, nothing to worry about

onederful100

yea, even after the tensioner and 8 rib conversion i still get dust in there and i'm pretty darn sure there's no slipping now, or no over slipping. i think it was modaddict that said a little slippage is normal otherwise the belt would just snap if it were too tight.

but i did lose a little boost bc i went to a 3.5 pulley instead of the 3.375. i went from 10-11 psi to 8-9 psi. but at least its working good now. maybe that leaves some room for hot rod cams.

blackS197

Yea i just called emailed adam at ST and he said belt dust in pulley is normal. Now i just have to fix that damn squeak. Im gonna prob drop by st sometime this week.