it doesn't have to do with how much boost, it has to do with the cooling properties of the fuel. the richer the mixture, the cooler it burns. especially with nonintercooled boost, you want it as rich as possible while still making power and running well. (too rich will foul your sensors and cat and eventually wash the cylinder walls, not good.)
11.0:1 is definitely on the safe side, if i were in your shoes (which i wouldn't be, i don't trust the blower/temps past 12psi, endyn or not) i would shoot for 11.0-11.5:1. i tuned my car to about 12.0:1 at 9psi.
440s will not be sufficient for 12psi. truthfully, for this setup, i might go even bigger than 550s.
Quote:
Originally posted by Ritteri
Well first off, I am sending out the SC itself to ENDYN to get fully reworked and ceramic coated. I am going to build up my spare block to be eventually replaced. So 550cc injectors may be the way to go with 12psi?? Am I looking to hit a 11:1 a/f ratio?? How do u guys know it needs to be at least 11:1 at 12psi?? Is there a chart or something for boost to air fuel ratio or something? The higher the boost the richer it needs to be? Please explain a bit. I am rusty still.
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