My fuel pressure at 0psi is about 43psi and at full boost...which is about 20psi...fuel pressure comes in at 65psi. At idle my pressure is at about 32psi. Hope this helps.
What is your fuel pressure at when you are at 0psi? It should be about 1lb of fuel pressure to 1lb of boost...but I am sure you probably already know that figure.Zerosoul said:finally...thanx for the info! it really helps to have someones # to compare mine to.
at idle I am about the same as yours, but at full boost I guess I am running lean at only 57psi. The repair manul says FPR should keep pressure 36psi above intake manifold...thats why I thought if I boost 19psi my FP should be about 55psi...guess not!
just for the record, what kind of FPR are you using? are you using it to bypass your stock FPR? what kind of FP gauge are you using?
your stock twin correct?
thanx again for your input...really appreciated.
Stock FPR.Zerosoul said:yup...1psi of boost, 1psi of fuel pressure.
I am gonna see where the fuel pressure is at when boost gauge reaches 0psi. hopefully by full boost (18psi) my fuel pressure will be 18psi more.
are you using aftermarket fuel pressure regulator or you just monitoring stock FPR? Defi gauges are nice..I was gonna get them too, but they didnt offer 60mm for fuel pressure that I needed to fit in the air vent, so I went with good old Greddy.
does Defi gauge reads in PSI or bar?
52mm gauges because the fuel pressure does not come in 60mm...which I have no idea why?Zerosoul said:just checked out your web pages...nice looking supra...and FAST!
what size is your Defi (PSI) fuel pressure gauge? seems like its 60mm in the pictures, but I didnt see 60mm fue pressure gauge offered in PSI readings on Defi website. where did you get them? I know RX-7 store sells Defi gauges...
anotehr thing, where did you purchase your NOS kit? is 100 shot safe with stock fuel system?
I have my FPR vacuum line T'ed into the stock FPR vacuum line andBLKMGK said:Your idle VACUUM will effect the pressure reading. Base fuel pressure has to be taken with no line attached. Regulators will lower pressure for vacuum and raise it under boost. Boost tries to push the fuel back up the line, hence the higher pressure to compensate, vacuum will try to suck it out of the rail\injector and this is why pressure goes lower. To really compare BASE pressures you must measure it sans vac connection....