Nissan 370Z Forum - View Single Post - S.O.S.

Spooler · 04-18-2019, 08:00 PM

What head studs did you use in your old motor? Nevermind, I see they were Cosworth head studs.
Looking at the TT kit you used and the Turbo's your drive pressure got way out of whack causing
excessive back pressure. This will increase the cylinder pressure and bye-bye headgaskets. That is
why you couldn't make over 21psi of boost. You got way out of your efficiency area.

04-18-2019, 08:00 PM	#100 (permalink)
Spooler A True Z Fanatic Join Date: Jun 2014 Location: Ga Posts: 13,803 Drives: 2013 Nismo 370z Rep Power: 2684392	What head studs did you use in your old motor? Nevermind, I see they were Cosworth head studs. Looking at the TT kit you used and the Turbo's your drive pressure got way out of whack causing excessive back pressure. This will increase the cylinder pressure and bye-bye headgaskets. That is why you couldn't make over 21psi of boost. You got way out of your efficiency area. Last edited by Spooler; 04-18-2019 at 08:24 PM.