Need Help with Belt For KB 2.2

[03TrchRedCobra]

I got a 2.2 with a 2.5" pulley for when i'm at the track. I also have Billetflow 4 piece idlers & when i ordered them Doug told me they would work but they did not know what size belt i would need. I have the stock lower to. Can anyone help me find out what size i need so i can go ahead & get it tuned.

Thanks in advance.

 

[03TrchRedCobra]

T T T

 

[Tman]

I use 71 inch gatorback belt for my setup at 21 psi, however it begun slipping pretty bad so I lost some boost. Im getting a new set of idlers next week so will see what happens.

 

[Tman]

Btw, let me know how well you did on the dyno! Good luck!