GP S C pulley size

[MOTOR'N]

Quote: Originally Posted by roland2003 (original)

Hi , weve just measured a GP S/C pulley and it calculates to -12%. So is the same as the JCW ones.
Best Regards Roland GTT

Roland, just to clarify. The GP pulley is 12 percent smaller and not the afore mentioned
14+/- percent?

[roland2003]

..Hi, both JCW and GP supercharger pulleys are 12% smaller diameter than the standard MCS ones. We've got a GP in today for the GTT +3% Crank Pulley, GTT TB Idler pulley ,GTT Tensioner Pulley ,GTT Tensioner Stop ,GTT/JCW Filter etc so weve been able to measure accuratly.......Give me a couple of hours and Ill tell you the boost too, as were fitting a boost guage too....should be around 15psi-16psi.with these mods.
Best Regards Roland GTT

[AprilWhine]

Thank you Roland, I was curious.

[roland2003]

......15.5psi at 6500rpm WOT in third with fully warmed engine

[Snowie]

Quote: Originally Posted by roland2003 (original)

......15.5psi at 6500rpm WOT in third with fully warmed engine

Confirmed - thanks for the work yesterday Roland. Should be back on the Dyno next Thursday.

Even more smiles per mile now

Alan

[Jaw_F430]

Quote: Originally Posted by roland2003 (original)

..Hi, both JCW and GP supercharger pulleys are 12% smaller diameter than the standard MCS ones. We've got a GP in today for the GTT +3% Crank Pulley, GTT TB Idler pulley ,GTT Tensioner Pulley ,GTT Tensioner Stop ,GTT/JCW Filter etc so weve been able to measure accuratly.......Give me a couple of hours and Ill tell you the boost too, as were fitting a boost guage too....should be around 15psi-16psi.with these mods.
Best Regards Roland GTT

What sort of boost pressure would you expect to see with a 15% pulley?


Regards


James

[Snowie]

Quote: Originally Posted by Jaw_F430 (original)

What sort of boost pressure would you expect to see with a 15% pulley?


Regards


James

15 PSI WOT in 3rd at 6500 RPM with stage 4 head

15.5 PSI with standard GP head

Facts from Boost gauge, Scan 2 and RR equipment


Alan