vortech belt slippage

[Thor24]

im sure this has been asked before but seems everyone setup is different from each other. i have an 01 cobra with a vortech v2 sc running 14 lbs of boost. the belt slips pretty bad at 4k-4500 rpms on dyno. pretty sure im running a 6 rib pulley set up with an oversized crank and smaller blower pulley. would an 8 rib setup stop the belt from slipping? or is there other stuff besides exchanging pulleys that would need to happen?
thanks

 

[01yellercobra]

What size pulley are you running? How old is your tensioner? Is the belt the correct size?

Those are the easy things to check. I'm running a 2.95" 8 rib blower pulley with a Thumprr tensioner and I don't have any noticeable belt slip.

 

[Thor24]

not sure on pulley size i bought the car how it is. ive had the tensioner and belt both replaced and that helped some. i think brought it from 4k rpm to 5400rpm before it slipped. i had heard of thump tensioner before but didnt know if that would fix it. figured id have to go to an 8 rib pulley first

 

[AluminatorSnake]

Maybe you could send your pulley to Carbinite to get it coated before you go 8 rib. Unless youre under 3.2-3" i wouldnt think belt slip would be that bad. Always buy a quality belt to like the greenback belt you see in lots of pictures on here.

 

[Thor24]

alright ill have to find out what size pulley i have and go from there. thanks