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running rich, what can i do?

Old 12-16-2003, 06:51 PM
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Default running rich, what can i do?

I have a 99 civic si with a vortech supercharger aftercooled with a 10 psi pulley, but I rarely see over 8 psi.
My problem is I am running extremely rich. I have a walbro 255 in tank fuel pump, a 255 t rex inline fuel pump that came with the kit. The vortech fmu, an apexi V AFC, and 310 injectors.
I am going to take off the 255 inline fuel pump, should this cause any problems running on only the walbro 255?
Also I would like to get rid of the vortech fmu and run the hack, but can this be done with 310 injectors?
What should I do?
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Old 12-16-2003, 07:45 PM
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Default Re:running rich, what can i do?

http://www.importparts.com/
Find the one for your car.Personally I woud ditch the FMU and go with the 450s and a AFC.If you still have the stock injectors put them back on.The 310s and the fmu will still make it run rich since there is nothing to controll them.
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Old 12-16-2003, 08:28 PM
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Default Re:running rich, what can i do?

I just checked my car, the vortech kit includes the check valve
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Old 12-17-2003, 06:17 PM
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Default Re:running rich, what can i do?

I still think your problem is the fmu and the 310cc injectors along with the afc.You should use one or the other.if the afc is not tuned the injectors along with the fmu are fludding the engine.
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Old 12-17-2003, 06:32 PM
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Default Re:running rich, what can i do?

Originally Posted by d16z64life
I still think your problem is the fmu and the 310cc injectors along with the afc.You should use one or the other.if the afc is not tuned the injectors along with the fmu are fludding the engine.

even with the V AFC settings on 0?
Cant i just lean it out with the VAFC?
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Old 12-17-2003, 06:39 PM
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Default Re:running rich, what can i do?

see the problem is that your trying to controll your fuel with too manny things,You have an fmu,checkvalves,310ccinjectors and an AFC.

I think with the 310 youll need to lean the AFC to about 10-15 percent.That might not modify map voltage enough to fool the map of reading boost.

Look,just give it a try.Either use the fmu with the check valves or the afc with the 310s,but dont use both.
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Old 12-17-2003, 07:47 PM
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Default Re:running rich, what can i do?

i think ill try ditching the fmu, and just go with the VAFC. Any ideas on what a my fuel maps will look like for low and high throtel?
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Old 12-17-2003, 09:01 PM
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Default Re:running rich, what can i do?

I think the wise decision would be to ditch the FMU and run some bigger injectors, but you can work with what you got. Take the FMU out and set the AFC to around -15 or so and see where you are at. You should already have the settings in the negative zone since those injectors are a bit bigger than stock. That's why you are running rich right now. Let us know how it goes and what you did.
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Old 12-17-2003, 11:54 PM
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Default Re:running rich, what can i do?

I could be wrong, but 310 seems waytoo small for 10 psi. I'd really recommend getting some larger injectors. With the injectors at STOCK pressure levels, you'd need to pull about 20-22% to get the correct fuel, at 10 PSI (with no practical experience yet ), I think you may even have to add fuel. Of course, I'm not that familiar with Superchargers, and how much they flow, so I could be mistaken. Still, it seems too iffy. If you did try to use the 310cc injectors and afc minus the fmu and check valves, I'd definately start out with +-0 for your settings.
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