Conway_160

iTrader: (1)

So I've been looking and can't find an answer. Is it necessary to have your fuel pressure increase with your boost? At 51psi w/ my 750's that is more than enough fuel for my procharger, is it really necessary for fuel pressure to raise since I will only be hitting 13-14psi of boost?

I know that raising the fuel pressure should help keep the duty cycle down but I wont even be close to maxing out my injectors.

str8dum1

iTrader: (11)

does your ecu have fuel pressure compensation? if not, you will run lean. injector pulse width of 1.2ms at 50psi is alot more fuel than 1.2ms at 51psi minus whatever boost you are running

Conway_160

iTrader: (1)

Im running a haltech redbox so im not 100% sure i haven't really looked at all the screens.

Conway_160

iTrader: (1)

Ok so im messing more with this haltech. I have a flow rate table that has -29.2 psi, 0 psi, and 33psi. If i set them all at 755. Static flow of my injectors can i leave my fuel pressure at a static 43.5psi?

phunk2

Fuel pressure profile just needs to stay the same as it was when the car was tuned. If you havent tuned yet, then its all up to you how to set the fuel pressure first.

Conway_160

iTrader: (1)

Ok it hasnt been tuned yet.

phunk2

In that case, you just need to make sure that under full boost, that your fuel pressure differential will be high enough to get the fuel you need. Because if you run out when you get up there, you get to start your fuel tuning over almost from scratch depending on the EMS.