Hyaboosta

I have a 2002 civic and I am almost done piecing together my custom turbo. I have a returnless fuel system so for the fuel set up I went with RSX-S Injectors(330cc) MSD Inline fuel pump, aeromotive Digital FMU and VAFC. But what I was told is that the vafc would be manipulating my map, so when I use it to lean out the fuel it will throw off my timing because it would still be on a fuel map for N/A.
IM switching out the VAFC for an Emanage but by using the emanage to tune the fuel,injectors and ignition directly will the FMU be doing anything or just be useless,Maybe like an overpriced FPR?

beerbongskickass

You have a returnless fuel setup? I have no idea what that means. The e-manage basically does the same thing the afc does, they are both hacks that manipulate your map sensor. Just get bigger injectors and use the e-manage or afc.

Hyaboosta

yeah but the vafc wil throw the timing off because it is fooling the map and the ecu still thinks the car is running NA. But with the emanage I forgot to metion I will be using the injector and ignition harness

TheShodan

iTrader: (14)

Because it is a returnless fuel system, the FMU is useless. Just use the E-manage to take care of it for you.

Hyaboosta

Just to help you guys judge the situation. I was thinking that i could use the fmu to get a rough tune of the fuel curve and use the emanage to fine tune. because this fmu is adjustable. here is a link to the one that I have http://www.behrents.com/Mercha...=PROD

TheShodan

iTrader: (14)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Hyaboosta &raquo;</TD></TR><TR><TD CLASS="quote">Just to help you guys judge the situation. I was thinking that i could use the fmu to get a rough tune of the fuel curve and use the emanage to fine tune. because this fmu is adjustable. here is a link to the one that I have http://www.behrents.com/Mercha...=PROD</TD></TR></TABLE>

No, that is the whole point of E-manage is to tune the entire fuel curve for you without the FMU, if you try to use it, the E-manage and FMU will fight one another in order to regulate the fuel in several spots.

Don't make it more complicated. Use one or the other, but not both. If you use E-manage, use slightly larger injectors. You'll run into fuel issues if you try to use both.

Hyaboosta

thanks for the info

Johnyquest

Just to say it one more time, an FMU does NOT work on a returnless fuel system. The whole principle behind it is pressure fed to the diaphram on the FMU pinches the return line (which you don't have) to increase fuel rail pressure, hence w/o a return line... no FMU is possible.

Matt

Hyaboosta

an fmu does wokr on a returnless system because alot of boosted 7th gen civics are running it and it works fine. It runs off the pressure increase in your intake manifold.