Rising Rate FPR....

[kapower06]

for starters I plan on running a t3 super 60 turbo (.48 exh. , .60 com.) at whatever the factory internal wastegate is set at. I believe its 6-7 psi. For fuel I plan on running a Walbro pump with a rising rate fpr. only until I get a SAFC. I was wondering if I should get a 6:1 or 7:1. Ive heard stories about 8:1 and above being too much pressure on the fuel system above 5 psi. Also the stock FPR is a 1:1 ratio so will this add onto the rising rate one. (ex. stock FPR at 2 psi would be an increase of 2 psi on the fuel system. Now with a 6:1 rrfpr would the fuel pressure increase the 12 extra psi from the rrfpr plus the extra 2 psi from the stock FPR? ) sorry If that is confusing. But a synopsis is what ratio rrfpr should I get for a t3 super 60 on a Ka-e at 6-8 pounds? thanks -Jake

[foley]

I setup a nissan truck motor with a 10:1 regulator and had no problems with the fuel system, but I'm too new to know if that helps you out any on the car motor. I know the intakes are slightly different, I imagine the fuel system is as well.

As for your question about piggy backing the regulators, it won't give you any more pressure. The regulator with the highest pressure will rule, ie: the stock regulator will rule out under vacuum, and the rising rate regulator will rule out under boost.

for starters I plan on running a t3 super 60 turbo (.48 exh. , .60 com.) at whatever the factory internal wastegate is set at. I believe its 6-7 psi. For fuel I plan on running a Walbro pump with a rising rate fpr. only until I get a SAFC. I was wondering if I should get a 6:1 or 7:1. Ive heard stories about 8:1 and above being too much pressure on the fuel system above 5 psi. Also the stock FPR is a 1:1 ratio so will this add onto the rising rate one. (ex. stock FPR at 2 psi would be an increase of 2 psi on the fuel system. Now with a 6:1 rrfpr would the fuel pressure increase the 12 extra psi from the rrfpr plus the extra 2 psi from the stock FPR? ) sorry If that is confusing. But a synopsis is what ratio rrfpr should I get for a t3 super 60 on a Ka-e at 6-8 pounds? thanks -Jake

[skatanic28]

i think someone on here or ka-t.org did a few wideband pulls with an 8:1 and it was pretty good. even then, you are hitting fuel pressures over 100 though....

[kapower06]

why is 100 psi the magic number not to pass with a fuel system? If it matters the owner before me installed brand new OEM injectors. could you just use high pressure fuel hose? or possibly metal tubing? any help would be great... so an 8:1 it is. thanks

[nissanfanatic]

I run a 8:1 at 6psi on a T04B .60ar S-trim compressor. Whole setup is: Walbro 255lph with rewired fuel circut, 300zx fuel filter and stock everything else. I run 12.0-12.6:1 AF ratios via PLX M-300 wideband. The AF ratio is very bouncy as well.

RRFPR- a fuel pressure regulator that keeps a constant fuel pressure avaliable to the injectors. By constant I mean a constant supply according to manifold pressures as well. Vacuum is present, fuel pressure in the fuel rail is dropped. Boost is present, fuel pressure is raised. Hence rising rate.

FMU-a device that raises fuel pressure on a ratio according to boost pressure. This device will not regulate fuel pressure without manifold pressure present.

A RRFPR is not a FMU. Your car will run with only a RRFPR. Your car will not run with a FMU.