Hey everyone!

I was wondering the use of a Rising Rate Fuel Pressure Riser.
The stock fuel pressure regulator is tapped into the manifold vacuum hose... which only reads vacuum, even under boost. Naturally, less vacuum it sees (up to 0), the higher it raises the fuel pressure.

So... if we were to move that vacuum line on the fuel pressure regulator from the stock place on the manifold, to the spot right behind the throttle body (shows vacuum AND boost)... would the boost in that line make the fuel pressure raise higher enough to not need a RRFPR?

one more Q...
how does the RRFPR work? what is it tied into? any electonics - or just that vacuum line?

Thanks folks,
g

First off, I'm not sure what you mean by "the manifold vacuum hose... which only reads vacuum, even under boost." Unless there's something particularly special about this line (i.e. a check valve) then this line will see boost.

Anyway, the stock regulator is awful puny! Not sure it would be able to raise the pressure enough on its own.

The Bell RRFPR is mechanical and uses to electronics. The RRFPR is cut into the fuel return line, after the stock FPR. The RRFPR uses a vacuum line (same as an EBC or boost gauge). The Bell unit I'm using has 2 settings: fuel pressure at atmosphere and rate. The fuel pressure at atmosphere allows you to set the fuel pressure at "0" psi. The rate is a thumbscrew which you can use to adjust the rate of rise on the fuel pressure.

Steve
http://www.forcefed4.com/

Hey steve, thanks for helping again! you da man.

The line i was refering to is on the passenger side of the intake manifold, on the rear. there must be a check valve in there. i tried to use it for my boost guage but the guage never went above zero. (I'm now using the line that is right after the throttle body on the top/center of the manifold for the boost guage.)

OK, so the rrpfr is physically doing the work to pressurize the fuel - not just tricking the stock parts into doing it?
And at idle/vacuum, it can be at no compensation (stock fuel pressure)?

The bypass valve on my sc starts to close at about 10inHg... so below that i'd like to have stock fuel pressure. Is that possible with the rrfpr?

And if you don't mind... where can i pick one up?

BTW... thank you George W. B.
g

Bump:p