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FPR... is vacuum used in TBI application?
Posted: Sat Feb 26, 2011 1:53 am
by jb007
I have a GM injector mounted in a Patton Machines SU HIF44 adaptor. The injector is mounted up-stream of the butterfly. I'm using an Aeromotive Fuel Pressure Regulator set to a nominal 12PSI.
My question is, should I connect a vacuum line from the FPR to a ported vacuum source or is this only done if the injector is on the down-stream side of the butterfly, eg ported injection?
Re: FPR... is vacuum used in TBI application?
Posted: Mon Feb 28, 2011 6:20 am
by convertables_10
Vacuum is not used when the injector before the butterfly. When its above the butterfly there is not a pressure difference across the injector as there is when the injector is mounted after the butterfly. Exception to this is if i was running boost and needing the fuel pressure to rise 1:1 with boost. Im planning mine out now and i have to update my fuel pressure regulators in each of my tbi units.
Re: FPR... is vacuum used in TBI application?
Posted: Mon Feb 28, 2011 3:21 pm
by jb007
Thanks for the hands up. Had a look at your site, keep going as the EFI conversion has made a lot of difference to my car.
Re: FPR... is vacuum used in TBI application?
Posted: Thu Apr 14, 2011 8:19 am
by devastator
convertables_10 wrote:Exception to this is if i was running boost and needing the fuel pressure to rise 1:1 with boost. Im planning mine out now and i have to update my fuel pressure regulators in each of my tbi units.
FWIW, we installed a RRFPR between the return line on a TBI and the tank, and it was able to alter the fuel pressure accordingly.