TVS belt slipping

[RobT2727]

I installed a 72mm s/c pulley with a 100mm idler and 81.5" belt. I have slip at high rpms. Any thoughts?

 

[vortecd]

I installed a 72mm s/c pulley with a 100mm idler and 81.5" belt. I have slip at high rpms. Any thoughts?

Smaller you go the harder it is going to be to not slip. Try sandblasting (or something similar) to give the pulley some grip. I had good luck doing this with my Vortech pulley's on my '87.

Another option would be to go to a bigger crank pulley then you could run a bigger blower pulley and make the same boost.

 

[alex12gt]

Hmm interesting just ordered a 72mm pulley im going with a smaller belt and the 90 and 100mm idlers from jlt

 

[turbosha]

what boost will the 72 put you at?

 

[RobT2727]

Just tried a new 81.5" belt and it works. Seeing 12psi throughout until 7k, then creeps up to 12.5psi before the shift.

 

[turbosha]

how old was the other belt?
you running a rousch blower?
i was looking at the VMP kit.

 

[RobT2727]

I have a Roush kit with most of the VMP add ons. I bought my kit last summer before the VMP kits were available.

 

[alex12gt]

Im throwing 72mm with a jlt should be about 14 ish

 

[alex12gt]

You running the ported elbow by chance?

 

[turbosha]

any problems with the balancer sliping or the oil pump gears?
alex, i know you have the hardened. i mean stock.

 

[RobT2727]

I have the 123mm JLT and the ported elbow & ported blower. The motor is 100% stock.

 

[slagburn]

Anybody use a Gates green belt? I see them on GT500s sometimes, not sure if they have one that fits the Roush kit.

 

[turbosha]

I have the 123mm JLT and the ported elbow & ported blower. The motor is 100% stock.

Whats the hp to he wheels?

 

[Chaney5.0]

Smaller you go the harder it is going to be to not slip. Try sandblasting (or something similar) to give the pulley some grip. I had good luck doing this with my Vortech pulley's on my '87.

Another option would be to go to a bigger crank pulley then you could run a bigger blower pulley and make the same boost.

Would sand blasting throw off the pullys balancing and weight?

 

[alex12gt]

I have the 123mm JLT and the ported elbow & ported blower. The motor is 100% stock.

How much of a difference did you notice with it ported?

 

[alex12gt]

Anybody use a Gates green belt? I see them on GT500s sometimes, not sure if they have one that fits the Roush kit.

I looked into that tonight since im buying a new belt anyway going green belt or green striped

 

[turbosha]

Would sand blasting throw off the pullys balancing and weight?

dont go overboard and it will be fine. just etching the surface not taking it down.
i think theres a company that offers some kind of anti slip coating.

 

[vortecd]

Would sand blasting throw off the pullys balancing and weight?

Nope. All you are doing is roughing it up so the belt isn't riding on a smooth surface.