I don't have one, but from everything else the people on here have posted it is 7-8PSI. I think the r-speed check vavle bumps it up to 9.. And there is one person on here running 10psi with a smaller pulley and piggy back ecu to adjust for the extra air flow...
At less than 10PSI you probably don't need to do anything to the internals of a healthy engine.. I think the m42 with forged internals could probably handle well over 10PSI, but I have no way to prove that just yet. |