fuel pressure/SAFC 2

[DAROOKE]

What fuel pressure should i run? I have 50 trim,750's, return line, I WANT TO RUN ABOUT 19 PSI OF BOOST. i ALSO NEED THE BASE MAP WITH RETURN LINE. tHANKS!

[Munky]

Jay set mine up to run 43psi of pressure. But after a few glitches he told me to turn it up to 45psi. I'm running pretty much your same setup.

[hozay09]

You don't need no stinkin' base map. Set it around 43psi and see where it stands.

Street tuning is your friend.

[Munky]

Hozay4980 (11:58:54 PM): sorry, can't do that. im just a vendor<~~~~LIAR!!!

[DAROOKE]

Thanks guys!

[fak3r]

you dont really need a return line if you're already running 750's. SAFCII with 750's and a fuel pump should do the job.
my .2

[N2MB]

you dont really need a return line if you're already running 750's. SAFCII with 750's and a fuel pump should do the job.
my .2
actually a return is a must have..not trying to shit in your picnic basket but when it comes to tuning a turbo car here is the rule of thumb..you must mechanically increase the fuel volume in order to lean it out..sounds retarded but thats the truth

[fak3r]

actually a return is a must have..not trying to shit in your picnic basket but when it comes to tuning a turbo car here is the rule of thumb..you must mechanically increase the fuel volume in order to lean it out..sounds retarded but thats the truth

agreed but my understanding is that the 750's will inject enough fuel to run a big turbo, hence the upgrade from stockers or even stage 2 to 750's. along with S-AFCII, which will manager your fuel/air ratios, it shoud be plenty if you're running 50 trim arnd 380 - 420hp, WITHOUT having to get a return line.
please correct me if i am wrong. this may just be my ignorance :confused:

[N2MB]

agreed but my understanding is that the 750's will inject enough fuel to run a big turbo, hence the upgrade from stockers or even stage 2 to 750's. along with S-AFCII, which will manager your fuel/air ratios, it shoud be plenty if you're running 50 trim arnd 380 - 420hp, WITHOUT having to get a return line.
please correct me if i am wrong. this may just be my ignorance :confused:
they are high impedence injectors and require a larger volume at a lower pressure.you will never have enough fuel to support 380-420 whp without mechanically increasing the volume first.

[killasr4]

i believe the problem is n2mb is talking about flowing more fuel and the other guy doesnot understand the difference between flow and pressure??? possibly

[N2MB]

well i dont know how to explain it without giving a bunch of meaningless mumbo jumbo technical crap thats probably useless to most.it all relates to the bernouli principles of physics.

im gonna try to explain it i hope this works

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above is a not so good diagram of a straight pipe that funnels down into a smaller section of a pipe.in the bigger section of the pipe will have a lower pressure than the smaller section because of less restriction and more area.as it goes into the smaller section the pressure will increase and the area will decrease.i hope everyone is still with me here.lets say that this is a stock fuel system and operating at 58 psi.
now lets take that same pipe and make it bigger where the restriction is like this
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ok now we are going to supply the same 58 psi of fuel pressure through this pipe.what is going to happen now is the pressure hasnt changed however the area(volume) has changed.the result will be more fuel volume at the same pressure.
well,we dont need that much fuel so we need to effectively drop the pressure so that we have the correct amount of volume.an srt fuel system is wickedly retarded and restricted.it works great for the amount of hp that is was designed to support but is inadequate for a substantial amount of more power.if you want more technical information and the mathematical equation you can find it by googling bernoulli's principle.

[fak3r]

Thanks for the detailed explanation, N2MB. It looks like I will be getting a return line shortly :thumbsup:

[DrEdSrT4]

how are you gonna control your fuel pressure if you dont have the return line.. the return line = best