I have been doing some searching but cannot find much info on running higher than stock fuel pressure.

While speaking to some local rally guys who tune Imprezas they have had great results running really high fuel pressures, obviously the injectors they are using must be ok with it.

Just wondered if anyone had any experience or seen different results with running higher pressure for better atomization.

I have a set of ID725 for a new build and noticed on the spec sheet they have a max differential pressure of 123.5psi

 

Depends what injectors you're using. Some designs won't seal properly or may have trouble opening and closing at elevated pressures. From what I've read on the subject the more modern designs tend to like it though.

If the data sheet says you're good, you should be good. Give it a try! I would suggest logging a pressure transducer on the fuel line and setting up a math channel in your logger or doing some mapping in Excel to make sure your regulator is behaving the way you want it to.

(P.S. I've been wanting to try this with my EV14's, haven't had time to play lately though))

 

yeah, looks like im gonna have to give it ago and see how it works out.

will log what i do and post it up anyway, may be some help to someone else.

 

I left a sentence out when I typed that response. Specifically what I was talking about regarding mapping the pressure was using (fuel pressure) - (MAP) so you are checking what the actual relative fuel pressure is.

Some of the fpr's I've come across, especially the cheaper rail mounted ones, don't reference manifold pressure very well.