can I use my field vtec controller as an fmu?
06-28-2003, 09:02 PM
#1
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Join Date: Jun 2003
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can I use my field vtec controller as an fmu?
I wanted to know if anny one here has used a fields vtec/acf as an fmu.I havent boosted yet becouse iI am new to the turbo scene and I am trying to soak up as much tech info as possible before I build my own turbo setup and I dont want to risk blowing my beloved d16z6.I figure this would work since the controller is allready fooling the map senser!!
06-30-2003, 11:00 AM
#2
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Join Date: Apr 2003
Posts: 2,260
Re:can I use my field vtec controller as an fmu?
OK, you have some "mixed up nomenclature" as Joseph would say to asm.
Anyway, an FMU is a fuel management unit. Also referred to as Rising Rate Fuel Pressure Regulators. These is are hardware devices that normally connect directly to your fuel line and are managed by vacuum/pressure from the intake manifold. When pressure from the manifold is high, it responds by increasing the fuel pressure in the fuel rail. Thus, increasing fuel flow of a standard injector pulse without increasing the pulse itself.
The Fields V-AFC is an electronic device that scales map sensor voltage based on input by the user to increase or decrease injector pulse width. Not fuel pressure. It does this by making the ECU think it's at a higher or lower manifold pressure than it actually is, thus forcing the ECU to compensate with more or less fuel, respectively.
Now, to answer your question: No.
Anyway, an FMU is a fuel management unit. Also referred to as Rising Rate Fuel Pressure Regulators. These is are hardware devices that normally connect directly to your fuel line and are managed by vacuum/pressure from the intake manifold. When pressure from the manifold is high, it responds by increasing the fuel pressure in the fuel rail. Thus, increasing fuel flow of a standard injector pulse without increasing the pulse itself.
The Fields V-AFC is an electronic device that scales map sensor voltage based on input by the user to increase or decrease injector pulse width. Not fuel pressure. It does this by making the ECU think it's at a higher or lower manifold pressure than it actually is, thus forcing the ECU to compensate with more or less fuel, respectively.
Now, to answer your question: No.
06-30-2003, 06:47 PM
#3
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Re:can I use my field vtec controller as an fmu?
Ok now let me see if I get this.So I wouldnt be abel to use the fuel control portion of the device to pulse the injectors enough to conpensate for the higher demand of fuel that the turbo would requireat at high boost(about 8 psi)?
06-30-2003, 07:36 PM
#4
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Re:can I use my field vtec controller as an fmu?
Ok, I'm going to use TurboEF9's words and say you have some "mixed up nomenclature" yet again.
So the answer to your new question would be yes, it will compensate for boost. It will not change the fuel pressure as an "FMU" would. Quit changing your questions damn it!!!!
J/K
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So the answer to your new question would be yes, it will compensate for boost. It will not change the fuel pressure as an "FMU" would. Quit changing your questions damn it!!!!
J/K
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06-30-2003, 07:54 PM
#5
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Re:can I use my field vtec controller as an fmu?
Since your being so cool about answering my questions here is another one.My Fields sfc only goes - or + 30 % so do you think this would be enough for stock injectors to run 8psi or would I need like some prelude injectors per say and adjust from there + or -?
06-30-2003, 08:16 PM
#6
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Posts: 2,260
Re:can I use my field vtec controller as an fmu?
Not exactly.. no.
Basically, stock injectors won't flow enough fuel. Meaning, even at 100% duty cycle, you'll run lean up-top while reaching full boost. This is the reason, for low boost applications (1 - ~5psi), you use an FMU and stock injectors. For higher boost applications (~6psi - 12psi), you use an AFC (Air Flow Converter/Air Fuel Controller) and 450cc injectors.
For extreme boost (~13psi+), you use a different 2 or 3 bar MAP sensor, 450cc injectors and a stand aloine fuel management system (Hondata, Zdyne, AEM EMS, whatever..).
Anyway.. Hope that clears some thigns up.
Basically, stock injectors won't flow enough fuel. Meaning, even at 100% duty cycle, you'll run lean up-top while reaching full boost. This is the reason, for low boost applications (1 - ~5psi), you use an FMU and stock injectors. For higher boost applications (~6psi - 12psi), you use an AFC (Air Flow Converter/Air Fuel Controller) and 450cc injectors.
For extreme boost (~13psi+), you use a different 2 or 3 bar MAP sensor, 450cc injectors and a stand aloine fuel management system (Hondata, Zdyne, AEM EMS, whatever..).
Anyway.. Hope that clears some thigns up.
06-30-2003, 08:27 PM
#7
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Re:can I use my field vtec controller as an fmu?
Ok so I plan on running no more than 8lbs of boost after I get 450cc injectors do I use the AFC to tune my injector pulse rate to try to reach a stoich air fuel ratio?
Should I dicth my fields and get an apex afc?
Should I dicth my fields and get an apex afc?
