Max Boost

m1k3 · 05-11-2003, 08:12 PM

I'll be putting some 510cc injectors in my car soon and I'm wondering what is the max boost I should run on these with a stock turbo with 7cm^2 turbine housing and rewired fuel pump?

Max boost on the stock turbo was 15PSI with 450cc injectors so...

510/450 = 1.13

That's a 13% increase in max fuel output. Our stock max boost is about 15PSI so...

1.13 * 15 = 17PSI

That means my new max boost should be about 17PSI. Does that sound right?

Zerocygnal · 05-13-2003, 01:55 PM

Your max boost is going to be where it starts knocking. Sure you can leave it at 15psi with the stock injectors. I run 18-19psi with stockers and no knock with .92v to .90v readings. I would suggest turning up the boost to 17psi, log it, then see if it knocked. If not raise it up another and log again. Sure the math works for 17psi but it may be able to go higher it really depends on the condition of your fuel system. Every engine is going to behave slightly different.
Just my 2 cents