drace99

I installed a Roush M90 supercharger on my 2007 GT convertible and I also installed the Roush CAI too. After driving it for a while it just doesn't seem as fast and powerful as it used to. Any suggestions?

Flat out

http://vmptuning.com/

wcgman

beat me 2 it

Roy_R

It performs much better in cooler winter air...

Diabolical!

^Truth. Superchargers, especially positive displacement superchargers, love cold weather. I believe the M90 maxes out at around 450rwhp.

drace99

I clicked on the VMPtuning link, but what product should I look at...or should I just call them?

lawrencecar1

add new pulley and get a few more psi. i went with the metco 2.57 pulley and got 9 psi..

http://www.metcomotorsports.com/prod...prod=MRP2%2E57

LaMotta

I suggest doing a 2.57 pulley as well & if you don't have long tube headers get them it'll jump the car up about 30rwhp...other than that you're going to be about maxed out on that m90 but should still make mid 400's which is still in the safe zone on the engine as well. Depending on which gear ratio you have a 3.73 or even 4.10 (my personal car had longtubes, 4.10's roush m90 on 7psi and steeda cai and was a blast on the street through the stock auto trans and went 12.1 @ 115 on 93 octane in 100 degree fl heat & made 430rwhp.) if you need any other info or where to order these parts get in contact w/ me!