Nissan 370Z Forum - View Single Post - Fast Intentions Stage 2 TT build by MA-Motorsports.

Spooler · 06-08-2021, 11:43 AM

If you want to know the rule of thumb behind the wastegate spring it is this.

3 port MAC valve:
12psi boost on wastegate spring = Max boost around 24psi. You double it.
I was at 70% duty cycle on the MAC valve at 25psi before.

4 port MAC valve:
12psi boost on wastegate spring = LOL, I have no idea. Guess we will find out.

06-08-2021, 11:43 AM	#3827 (permalink)
Spooler A True Z Fanatic Join Date: Jun 2014 Location: Ga Posts: 13,800 Drives: 2013 Nismo 370z Rep Power: 2684392	If you want to know the rule of thumb behind the wastegate spring it is this. 3 port MAC valve: 12psi boost on wastegate spring = Max boost around 24psi. You double it. I was at 70% duty cycle on the MAC valve at 25psi before. 4 port MAC valve: 12psi boost on wastegate spring = LOL, I have no idea. Guess we will find out. Last edited by Spooler; 06-08-2021 at 12:09 PM.