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Subject: "RE: How much fuel do I need to push 14-16psi??"

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Avenger	Aug-29-04 06:43 AM
Old School 2GNTer 2453 posts,

#75644, "RE: How much fuel do I need to push 14-16psi??"
In response to In response to 17

Originally posted by tim97rs

Originally posted by eclipse982nrRST I serached through like 40 pages and didnt find any actual answers of what setup anyone is using with the FMU.

well, this time i wont be a dick to you, but realisticly, you probably didnt find any answers because what your trying to do is out-dated and no one is really using an FMU. Honestly, you shoud really think about doing it right the first time around. Dont fuck with an FMU, at the very least get the SFMU. no one is using just an FMU anymore, een with an SAFC...

I swear you people just don't know crap. This proliferation of bad information is stupid around here. First ... there are PLENTY of people running a FMU and an AFC (er ... me being one of them and I make/made more power than 90% of the board). The adding of larger injectors and adding an AFC was the natural progression of all Star kit users because they all came with just an FMU and didn't require replacing the stock FPR. To maintain that system with redesigning the whole fuel system to add larger injectors people began to use the AFC and a different disc in the FMU. The AFC would be used to alter the MAP signal to show more vacuum at cruising so that the ECU would translate that to cell in the fuel table that would provide the correct amount of fuel. Does it throw off load calculations, yes. Which is why you want to make sure that at WOT and open loop that the adjustments are closer to 0. Some people though actually want adjustment in the hi-throttle map of the AFC so that the ECU would advance timing based on the new MAP value but that's risky on a stock motor.

I've helped do the FMU/AFC combo on 3 cars and at one point EVERY 2gNT with a Star kit in Texas was running this setup and all of them made GOOD power with it (over 300whp).

I'm amazed that all of you people swear off on the SFMU like it's freaking the best solution. BOTH setups have their own set of pros and cons and I'll list them both.

Stock FPR, FMU, AFC, Larger Injectors - Pretty much what I said in the first paragraph. Pros are that is is fairly easy to install, if you don't have a return line you don't have to make one to use this. It does require some knowledge on how everything works though. You can do adjustments in the car instead of stopping, jumping out and fiddling with the bleed screw on the SFMU. Cons are that it does screw witht the load calculations the ECU does. Some people like it and some people hate it because it advances timing.

SFMU and larger injectors - Nothing wrong with the setup but it really came about as the next logical step for HRC turbo kit users that wanted to replaced the Craptech. If you have an HRC setup this is an easy deal to replace the craptech and pop the SFMU in. If you have a Star kit on a 96+ then you have to run and return, bypass the stock FPR, blah blah blah. Pros - allows you to run larger injectors by lowering the FP. It's 1 unit so you don't have multiple things floating around. Cons - You run very low stock FP with larger injectors. It is a FACT that injectors were NOT designed to see that low of fuel pressure. This minimum fuel pressure requirement varies by injector manufacturer. The lower the FP the worse fuel spray patterns and fuel atomization is. Just because everyone does it now doesn't mean it's the RIGHT way to do it (as everyone's opinion on the FMU setup though it was the way to go 2 years ago).

There I'm done venting. For the guy that orginally posted ... go to RC Engineerings website. Work through their fuel calculations on their tech page and determine what full boost FP you want. Add the amount of boost that you will be running to that number (have to match pressure behind the injector to pressure in front of it). Subtract that stock FP from that number. Then divide by the amount of boost pressure you are planning to run. That is the rise rate you want out of your FMU. You will need the AFC to make things play nice at cruise and idle.

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

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How much fuel do I need to push 14-16psi?? [View all] , eclipse982nrRST, Aug-27-04 04:50 PM

RE: How much fuel do I need to push 14-16psi??, tim97rs, Aug-27-04 08:43 PM, #1

RE: How much fuel do I need to push 14-16psi??, Scandelous, Aug-28-04 03:38 AM, #2

RE: How much fuel do I need to push 14-16psi??, eclipse982nrRST, Aug-28-04 07:52 AM, #3

RE: How much fuel do I need to push 14-16psi??, TXTurboGS, Aug-28-04 08:09 AM, #4

RE: How much fuel do I need to push 14-16psi??, eclipse982nrRST, Aug-28-04 08:28 AM, #5

RE: How much fuel do I need to push 14-16psi??, djtrickee, Aug-28-04 08:33 AM, #6

RE: How much fuel do I need to push 14-16psi??, eclipse982nrRST, Aug-28-04 08:42 AM, #7

RE: How much fuel do I need to push 14-16psi??, tim97rs, Aug-28-04 08:58 AM, #8

RE: How much fuel do I need to push 14-16psi??, eclipse982nrRST, Aug-28-04 10:03 AM, #9

RE: How much fuel do I need to push 14-16psi??, EclipseRST, Aug-28-04 10:26 AM, #10

RE: How much fuel do I need to push 14-16psi??, eclipse982nrRST, Aug-28-04 10:44 AM, #11

RE: How much fuel do I need to push 14-16psi??, tim97rs, Aug-28-04 12:41 PM, #12

RE: How much fuel do I need to push 14-16psi??, DarKReaLity, Aug-28-04 01:39 PM, #13

RE: How much fuel do I need to push 14-16psi??, TXTurboGS, Aug-28-04 08:03 PM, #14

RE: How much fuel do I need to push 14-16psi??, CarbonFiberRST, Aug-28-04 10:48 PM, #15

RE: How much fuel do I need to push 14-16psi??, eclipse982nrRST, Aug-29-04 04:40 AM, #16

RE: How much fuel do I need to push 14-16psi??, tim97rs, Aug-29-04 06:19 AM, #17

RE: How much fuel do I need to push 14-16psi??, Team

Avenger, Aug-29-04 06:43 AM #18

RE: How much fuel do I need to push 14-16psi??, Team

Avenger, Aug-29-04 06:57 AM, #19

RE: How much fuel do I need to push 14-16psi??, eclipse982nrRST, Aug-29-04 11:22 AM, #20

RE: How much fuel do I need to push 14-16psi??, eclipse982nrRST, Aug-29-04 11:41 AM, #21

RE: How much fuel do I need to push 14-16psi??, DarKReaLity, Aug-29-04 12:27 PM, #22

RE: How much fuel do I need to push 14-16psi??, eclipse982nrRST, Aug-29-04 12:36 PM, #23

RE: How much fuel do I need to push 14-16psi??, DarKReaLity, Aug-29-04 12:55 PM, #24

RE: How much fuel do I need to push 14-16psi??, Team

Avenger, Aug-29-04 01:25 PM, #25

RE: How much fuel do I need to push 14-16psi??, DarKReaLity, Aug-29-04 04:12 PM, #29

RE: How much fuel do I need to push 14-16psi??, eclipse982nrRST, Aug-29-04 01:25 PM, #26

RE: How much fuel do I need to push 14-16psi??, Team

Avenger, Aug-29-04 01:27 PM, #27

RE: How much fuel do I need to push 14-16psi??, eclipse982nrRST, Aug-29-04 01:51 PM, #28

RE: How much fuel do I need to push 14-16psi??, djtrickee, Aug-29-04 04:56 PM, #30

RE: How much fuel do I need to push 14-16psi??, tim97rs, Aug-29-04 08:20 PM, #31

RE: How much fuel do I need to push 14-16psi??, eclipse982nrRST, Aug-30-04 01:46 AM, #32

RE: How much fuel do I need to push 14-16psi??, Team

Avenger, Aug-30-04 03:50 AM, #33

RE: How much fuel do I need to push 14-16psi??, eclipse982nrRST, Aug-30-04 03:11 PM, #34

RE: How much fuel do I need to push 14-16psi??, tim97rs, Aug-30-04 06:24 PM, #35

RE: How much fuel do I need to push 14-16psi??, eclipse982nrRST, Aug-31-04 08:38 AM, #36

RE: How much fuel do I need to push 14-16psi??, Team

Michael_97RS, Aug-31-04 08:46 AM, #37

RE: How much fuel do I need to push 14-16psi??, eclipse982nrRST, Aug-31-04 09:32 AM, #38

RE: How much fuel do I need to push 14-16psi??, Team

Avenger, Aug-31-04 09:43 AM, #39

RE: How much fuel do I need to push 14-16psi??, eclipse982nrRST, Aug-31-04 03:19 PM, #40

RE: How much fuel do I need to push 14-16psi??, tim97rs, Aug-31-04 04:40 PM, #41

RE: How much fuel do I need to push 14-16psi??, Team

Avenger, Aug-31-04 04:45 PM, #42

RE: How much fuel do I need to push 14-16psi??, eclipse982nrRST, Sep-01-04 01:14 PM, #43

RE: How much fuel do I need to push 14-16psi??, TXTurboGS, Sep-01-04 01:19 PM, #44

RE: How much fuel do I need to push 14-16psi??, turbo8u, Sep-01-04 02:03 PM, #45

RE: How much fuel do I need to push 14-16psi??, eclipse982nrRST, Sep-01-04 02:15 PM, #47

RE: How much fuel do I need to push 14-16psi??, tim97rs, Sep-01-04 02:32 PM, #49

RE: How much fuel do I need to push 14-16psi??, tim97rs, Sep-01-04 02:33 PM, #50

RE: How much fuel do I need to push 14-16psi??, MR BLUNT 2gnt, Sep-01-04 02:28 PM, #48

RE: How much fuel do I need to push 14-16psi??, tim97rs, Sep-01-04 02:11 PM, #46

RE: How much fuel do I need to push 14-16psi??, tim97rs, Sep-01-04 02:33 PM, #51

RE: How much fuel do I need to push 14-16psi??, tim97rs, Sep-01-04 02:36 PM, #52

RE: How much fuel do I need to push 14-16psi??, turbo8u, Sep-01-04 03:25 PM, #55

RE: How much fuel do I need to push 14-16psi??, djtrickee, Sep-01-04 02:38 PM, #53

RE: How much fuel do I need to push 14-16psi??, eclipse982nrRST, Sep-01-04 03:18 PM, #54

RE: How much fuel do I need to push 14-16psi??, DarKReaLity, Sep-01-04 05:31 PM, #56

RE: How much fuel do I need to push 14-16psi??, eclipse982nrRST, Sep-02-04 01:12 AM, #57

RE: How much fuel do I need to push 14-16psi??, Dave41079, Sep-02-04 01:57 AM, #58

RE: How much fuel do I need to push 14-16psi??, eclipse982nrRST, Sep-02-04 03:02 AM, #59

RE: How much fuel do I need to push 14-16psi??, tim97rs, Sep-02-04 07:01 AM, #60

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