Belt Size

[Friday25]

anyone know off hand what size belt i would need for a mp112 setup w/a 2.9" pulley and dual 100mm idlers?

[tx tahoe z71]

Pulley size -Belt Size -Boost psi.(apx.) - Goodyear# - Gates#

2.75" Pulley = 111.0 " Belt = 9 to 10 psi. - P/N=4061110 - P/N=K061110

2.8" Pulley = 111.0 " Belt = 8.5 to 9 psi - P/N=4061110 - P/N=K061110

2.9" Pulley = 111.5 " Belt = 7.5 to 8 psi. - P/N=4061115 - P/N=K061115

3.0" Pulley = 111.5 " Belt = 7.0-7.5 psi. - P/N=4061115 - P/N=K061115

3.1" Pulley = 112.0 " Belt = ---6--- psi. - P/N=4061120 - P/N=K061120

3.3" Pulley = 112.0 " Belt = 5 to 6.5 psi. - P/N = 4061120 - P/N=K061120

 

The boost reference numbers are for a 6.0.

[RembaSS 1SG]

Would these belt sizes be similar for a Vortech T-Trim. I sized down from 2.7 to a 3.0 and may go to a 3.3" pulley. I am getting a godawful squealing noise driving anything under 2500 rpm. I think my belts are too tight.