fmu + dyno tune
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From: Dallas, PA
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Originally Posted by Havok2k1
wtf? you replied to a thread that didn;t exist?!?!?
Originally Posted by Havok2k1
...and BTW, if its an old SF FMU, it can't be tuned...
Yeah, SF fmu can't be tuned.
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From: Toronto, Canada
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Originally Posted by jamie_civic
and ya how did you post a reply thats above my first post???
I'm confused too...
But to the topic!
With FMU you can only adjust a/f ratio with wideband, and I doubt you can do much of any so to say tune...a/f and its about it..
well its going to be tuned on a dyno with a wideband. so im guessing he'll adjust the fuel pressure by reffering to the wideband. anyways i was just wondering if anyones done it cuz i know most people install fmu's themselves and dont really tune it.
but ya the only thing that will be tuned is the a/f, but thats the most important.
but ya the only thing that will be tuned is the a/f, but thats the most important.
Originally Posted by supertuner
from my past experiences the dyno tailpipe wideband usually reads a/f approximately .5-1.0 point leaner than a wideband placed in the downpipe, just so you know
but thanx for the info, always good to know.
Joined: Mar 2003
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From: Houma, Louisiana
Rep Power: 305 i'm pretty sure you wont be able to tune at different points in the rpm band with that fuel system. You can adjust the pressure overall so that it doesn't run so rich/lean but thats pretty much it.
do yourself a favor and get the emanage at least.
do yourself a favor and get the emanage at least.
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From: Middleboro,MA
Rep Power: 297 IMO FMU = POOP. Be carefull man, its not a very acurate way to be tuning a car at all whatsoever. If it was, why would people spend so much on engine management computers? I got a stock lower end for sale in a few weeks lol.
i dont know why everyones saying an fmu is a terrible way of managing fuel...your right a computer system that controls the injectors is better but if an fmu is tuned properly theres really no problem with it at all, its just a very simple form of fuel management.
Originally Posted by XSRCivic
i'm pretty sure you wont be able to tune at different points in the rpm band with that fuel system. You can adjust the pressure overall so that it doesn't run so rich/lean but thats pretty much it.
do yourself a favor and get the emanage at least.
do yourself a favor and get the emanage at least.
but when it does a run on the dyno he will look at the wideband and know how to adjust the fuel pressure regulator.
i could have it street tuned with the wideband but once im tuning why not do it the right way, on the dyno.
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From: Middleboro,MA
Rep Power: 297 Well here's the thing. The FMU works by spiking fuel pressure. The factory injectors will only efficiently spray so much fuel before they start to get really inconsistent. They are probably running at 70-80% duty cycle and doing so running optimal efficiently at around 42-47 psi. If they were RCs or something you can push em harder but those lil factory things arent gunna like it. Hell what do I know, I only have a 212 whp d17 on 5.5- 5.8 psi. lol Do what you like but you might find out in a hurry just how bad things can get. I have witnessed cars on the dyno have major catastrophies because of FMUs. As far as I have seen FMU shoud stand for "F***s Motors Up". hehe
Originally Posted by 02fpcivic
Well here's the thing. The FMU works by spiking fuel pressure. The factory injectors will only efficiently spray so much fuel before they start to get really inconsistent. They are probably running at 70-80% duty cycle and doing so running optimal efficiently at around 42-47 psi. If they were RCs or something you can push em harder but those lil factory things arent gunna like it. Hell what do I know, I only have a 212 whp d17 on 5.5- 5.8 psi. lol Do what you like but you might find out in a hurry just how bad things can get. I have witnessed cars on the dyno have major catastrophies because of FMUs. As far as I have seen FMU shoud stand for "F***s Motors Up". hehe
anyways in the end its a very arguable subject and we can leave it at that.
Joined: Mar 2003
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From: Houma, Louisiana
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Originally Posted by jamie_civic
well you are right about the fuel pressure stressing the injectors a bit but at 4 psi of boost pressure (thats what im running with the fmu, maybe higher when i get ems) i dont think the extra bit of fuel pressure is really doing much because the injectors are made to fluctuate(spelling)
anyways in the end its a very arguable subject and we can leave it at that.
anyways in the end its a very arguable subject and we can leave it at that.
So you'll spend $1500 on AEM EMS or even $500+ on Emanage but won't spend $200 or so to buy bigger injectors and a better fuel pump? DO IT RIGHT THE FIRST TIME
Many turbo members like 02fpcivic and Andyman97 have been through alot more than you have and know the ups, downs, ends and outs about turboing the d17. Its truly is STEEP learning curve. I havent screwed anything up yet and thats because I did the research and know what to look out for.
Originally Posted by XSRCivic
So you'll spend $1500 on AEM EMS or even $500+ on Emanage but won't spend $200 or so to buy bigger injectors and a better fuel pump? DO IT RIGHT THE FIRST TIME
Many turbo members like 02fpcivic and Andyman97 have been through alot more than you have and know the ups, downs, ends and outs about turboing the d17. Its truly is STEEP learning curve. I havent screwed anything up yet and thats because I did the research and know what to look out for.
Many turbo members like 02fpcivic and Andyman97 have been through alot more than you have and know the ups, downs, ends and outs about turboing the d17. Its truly is STEEP learning curve. I havent screwed anything up yet and thats because I did the research and know what to look out for.
