Im using stock injectors on 12:1 compression with JUN III. Would 55 psi with the line on be to much? Im using a 190lph fuel pump. Is that psi to much, and what if any are the long term effects of keeping the fuel pressure that high?

 

increasing fuel press does not necess. mean more fuel delivery, assuming that is what you want to do, much better to play with injector pulse width. Also why establish how much press you want to run ahead of time?

why don't you start at a semi-conservative baseline, and up it gradually, checking seat of the pants response, sparkplugs, etc. if you do not have an air/fuel monitor or dyno....

 

I just want to know if 55 psi with the vacumm line on is too much psi for stock injectors. Ive upgraded to a 190lph fuel pump

 

It's not too high of a pressure for stock injectors. With the blower I hit high 60's all the time and have been for over a year.

More fuel pressure does mean more fuel to a certain extent. A 190 L/hr pump will start to lose fuel delivery at about 100psi.

Using bigger injectors and playing with duy cycle would be a better way to go, but on a stock ecu that would be a good trick.