alright guys I'm going to refer to this thread: http://forums.evans-tuning.com...limit
If you check it out you will notice that one guy on there claims that your fuel pressure is raised 1 psi per 1lb boost. So if I run at 40 psi at idle and full boost is 8 psi my max fuel pressure should be 48 psi.
How is this 1:1 fuel pressure raising obtained? Are they using a RRFPR (rising rate fuel pressure regulator) or does the alternator give more electricity to the pump?
I am still in the collecting parts stage of my turbo project and I was under the strong impression that I would have a constant fuel pressure to work with. Granted either case does not matter because as long as it's consistent every time I can tune to it by changing the duty cycles of the injectors. I would just like to know what this guy is talking about and why it's beneficial and how it's obtained... thx

 

any reg is a rising rate. (that i am aware of) although i have myself never used a stock reg for boost.

at WOT, the spring in the reg is pushing its hardest(w/o boost on top ot it) so when boost is applied, it is closing more, thus increasing the fuel pressure.

it isnt the alt feeding more voltage to the fuel pump.

if i am wrong, please correct me. i know there is a better way to word it.

 

That's pretty much a perfect explanation of how it works.

Boost pressure is fed into the regulator to increase the fuel pressure inline with boost pressure.

Think about what's happening. If you're at 40 psi and your injectors are spraying into an airstream with 15 pound of pressure in it and you aren't increasing the fuel pressure, the fuel is effectively only spraying through the injector at 25 psi, which will cause problems with tuning and fuel flow. You wouldn't want to have an FPR that isn't boost referenced.