I tried searching and I see people have different opinions as to what to use and what not to use regarding the SFMU setup.

I run 440cc injectors with the FMU right now and my fuel rail is leaking due to insanly high FP, above 150psi. The FMU is set at 10:1, dont ask why, LOL.

Anyway, this is what I want. Please correct me if I am wrong and feel free to comment.

440cc Rc injectors
Vortech SFMU 2.72 disk and soft srping for higher idle FP
Crane 16 cams
16psi of boost, daily driven

I am trying to achive 35psi of FP at idle for correct fuel atomization. I have the crane 16 cams and vortech says I may need a bleed vlave to achieve correct idle fuel preassure. I am confused as to what to do. BTW, I am upgrading to 525cc (50lbs) injectors as soon as I get the hang of tunning the vortech SFMU and the emanage.

Thanks for any help.

Anyone care to comment? I am sure most of you are tired of hearing the same things over and over, but I seriously did not find the right information. The closest thing to it was Siueclipse's setup, but he does not have cams. Thanks

I have both, but I am running the FMU with the 10:1 disk. I am changing that to the SFMU with the 2.72 disk, with the lighter spring.

I am getting a new fuel rail, not a venom or an obx. I know the fp is high, I did not tune it like that. The tooners did it, why? dont ask me cause I dont know.

Now, I am putting the SFMU back with 440cc injectors and I am planning on upgrading them to 525cc msd injectors.

I guess thats all.

-"Easy Mac"
05 Mazda RX-8 (RR8 #88)
99 Eclipse RS 398whp & 372lb-ft

Thank you Thura. I was about to post the same thing. All of this knowledge I got from you and Murix.

The reason I want 525cc injectors is simple, more boost (20psi) with 91 octane. I know I will run at idle, but you cares. Its not like I am idling my way to work or to other places, LOL.

Now the reason I am getting a new fuel rail is very simple if you read. That one is leaking and has a crack at the end of it. Imagine what 150psi of preassure can do to your fuel rail, not a very good scenario if you ask me. I am getting a 95 fuel rail as it has an orifice at the end where I can attatch the return line, unlike the 97-99.

So, should I use the bleed and check valves to raise or lower the idle FP? I have crane 16's. Anyway, thanks for the hlp guys.

If you guys want to run carburator fuel pressures through your injectors go ahead... but they will act like carburators and drip the fuel in.

I would shoot for a 30psi minimum fuel pressure at idle. You don't want fuel static in the fuel rail, you want constant motion and constant pressure, not a static condition because the return line has the same pressure as the feed.

I think everyone running fuel pressures in the teens should put their S-FMU, or whatever adjustable regulator in a box and get a basic FMU, and tune that with an S-AFC or an e-manage. Figure out you can run real base fuel pressures and still get a good idle.

Adjusting MAP values or injector pulse width, and get your fuel trims in normal levels and your idle will be fine.



Exile Racing Technologies: http://www.exileracing.com
una salus victus
It's holding down the garage floor right now.

Originally posted by Michael_97RS
I would shoot for a 30psi minimum fuel pressure at idle. I think everyone running fuel pressures in the teens should put their S-FMU, or whatever adjustable regulator in a box and get a basic FMU, and tune that with an S-AFC or an e-manage. Figure out you can run real base fuel pressures and still get a good idle. Adjusting MAP values or injector pulse width, and get your fuel trims in normal levels and your idle will be fine. Exile Racing Technologies: http://www.exileracing.com una salus victus It's holding down the garage floor right now.

Evo 8 - 12.3@113 circa 2009 (~330whp)
Now with BB Xona Rotor HTZ FP Red and ~450whp
2018 MSM Civic SI Ktuner TSP stage 1 w/ Honda hacked headunit.

_____________________________________
Jason ESi-T

04' BMW 325Ci
91' Nissan 240SX
98' Eagle Talon ESi (sold)

I have all the items already so the 8 injector setup is not an option, but thanks for the advice.

I also apologize. I did not see you were running Emanage.

--Kurt

ok i am in a similar situation, i am gonna run 15psi of boost on 440cc injectors with just a sfmu, please help me with which disk/ring combo and fuel pressures i should be running.

Mods:
CAI, OBX exhaust, Grillcraft grills, altezzas, ard ryver g6 17's wrapped w/ falken's, VIS racing c.f hood, 2 12" kicker comp's w/pioneer h.u, streetglow blue undercars, red dash kit, indiglo guages, n other shit

Just one thing I was wondering, what are the people running higher fuel pressures for idle running pressure wise on 440's. Also, at idle, what are your fuel map corrections on the e-manage or safc? I am running a fixed idle/static value of 20 psi on the fmu. My emanage is scaled from 235cc injectors to 300cc injectors, however I am using 440's. My current map correction is -19% at idle. If the idle pressure was say 35, the map corrections would be like -40%, this has got to mess up the timing.

lates
james

Rest In Peace Heidi Doggy

-"Easy Mac"
05 Mazda RX-8 (RR8 #88)
99 Eclipse RS 398whp & 372lb-ft

_____________________________________
Jason ESi-T

04' BMW 325Ci
91' Nissan 240SX
98' Eagle Talon ESi (sold)