I have an 06 mini supercharged. I just bought a cold air intake and I'm ready to buy a 17% pulley. the cooper s comes with 10 psi stock I believe. What is a safe psi number without having to change major things?
I have a 17% pulley & my boost gauge now shows 18psi, I have had no problems with that but I also have a bigger intercooler. The more boost you have the more heat it will generate so if your going for a 17% pulley it would be advisable to uprate the intercooler although some people run a 17% & a standard intercooler with no problems. In my opinion though you will lose some of the benefits you could gain from a 17% due to heat soak
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