- Joined
- Oct 16, 2014
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- www.makperformance.com
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- 2015 TY Mustang GT Premium
This is just wrong.Anyone suggest draining the blower oil yet?
If your that low on boost on a 4.75 you have a Vacuum Leak somewhere, i suspect by the Race Valve somewhere if its not making noise. 4.75 is 9psi on 18+ and 10psi on 15-17, unless we are talking about altitude. That changes the selections. That small difference isn't going to cause the valve to be quieter.I have a 4.75 pulley that came that way as a kit I ordered from beefcake, I was under the impression that the 4.75 pulley was for 8 to 9 lbs, it seems like it might only be on 6lbs or so if the 4.5 is for 9psi, I also have headers with free flowing exhaust which I understand drop boost 1 or 2 psi due to drop in back pressure.
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