Is a 2.5" 8-rib pulley safe on a S-trim?

[Supercharged86]

I'm currently running a 2.95" pulley on my S-trim, which last year made 540 Rwhp @ 5740 rpm's and 11 psi. The blower did make 14 psi thanks to the Anderson Powerpipe but that was @ 6110 rpm's (way past the peak HP). Will the 2.5" pulley be safe up to the 5700-6000 range? According to Vortech, the impeller speed calculator indicates approx. 56000 rpms @ this rpm range. This is 6000 rpm's over their recommendation. Any thoughts here? Thanks guys.

[Xtant]

I'm currently running a 2.95" pulley on my S-trim, which last year made 540 Rwhp @ 5740 rpm's and 11 psi. The blower did make 14 psi thanks to the Anderson Powerpipe but that was @ 6110 rpm's (way past the peak HP). Will the 2.5" pulley be safe up to the 5700-6000 range? According to Vortech, the impeller speed calculator indicates approx. 56000 rpms @ this rpm range. This is 6000 rpm's over their recommendation. Any thoughts here? Thanks guys.

Sounds like it's begging for destruction to me. You'll shorten it's lifespan pretty signifigantly I'd venture.

[regattacoupe]

IMHO, you'll never see 56,000 impellar rpm's due to belt slip. There's not alot of area on the 2.5" pulley for the belt to grab. You could let it slip and have huge low speed power though. Or get the 8" crank for your 2.95" pulley and lookout! :D

[musclestang89]

what about a bigger blower pulley?

[Supercharged86]

Thank you for the info. I'll look into the crank pulley instead.

[RdRunnr]

Get an 8" crank pulley instead....boost comes in quicker and there will be much less belt slipage...

[Supercharged86]

Thanks Eric, I think that's the route I'll go