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How to read boost on VAFC with no CEL. i got the solution

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How to read boost on VAFC with no CEL. i got the solution

Old 11-20-2003, 06:14 AM
  #1  
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Default How to read boost on VAFC with no CEL. i got the solution

IAm a 3 year BBA student and all I do all day long at classes is thinking about my civic.
I ve came up with the idea of doing an Electrical Missing link ----. and put it between my VAFC pressure signal and the ECU signal.
As far I was using a Greddy missing link on the map sensor.
But on the VAFC i HAd no boost shown
Now i ve set my device to stop signal to 3V, because its a shitty cheap resistor, when i get 5V signal "in" there is 3.2V "out" but that hould be low enought as not to get a CEL.
I will be mounting this in an hour i'll tell you later if it worked or just screwed my ECU
Thats how the shema looks


I hope it will work

what u guys think anyway?
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Old 11-20-2003, 10:16 AM
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Default Re:How to read boost on VAFC with no CEL. i got the solution

I guess I don't understand the problem your solutions attempts to fix.

If you mean by "read", you mean display boost pressures on the LCD, then it already does that. It can do that because it intercepts the MAP input signal to the ECU and gets th true reading from it.

If, however, by "read", you mean correct for positive manifold pressure without the ECU seeing it, then it does that also. The fuel curving function of the V-AFC scales the MAP input signal, and outputs it to the ECU. Because of the scaling before the signal gets to the ECU, there i no CEL if a proper scale is done.

I personally run 10psi on this setup. When done correctly, it works.
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Old 11-20-2003, 01:48 PM
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Default Re:How to read boost on VAFC with no CEL. i got the solution

his sig used to say 4psi on stock injectors but now it has changed, LOL!
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Old 11-20-2003, 02:40 PM
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Default Re:How to read boost on VAFC with no CEL. i got the solution

Originally Posted by ghettoturbo

in his sig it says he's using stock injectors
Rancid. The air flow increase vs stock injector output is horrible. Even NA, at the 1.3psi limit on a OBD0 setup, the 240cc injectors are at 85% duty cycle. The availability to pulse duration at increase at maximum boost is *very* minimal.

..scary setup, very scary..
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Old 11-20-2003, 08:27 PM
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Default Re:How to read boost on VAFC with no CEL. i got the solution

And he spelt zener wrong, you could just use two diodes in series, that would drop the voltage 1.6 volts.
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Old 11-21-2003, 03:55 AM
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Default Re:How to read boost on VAFC with no CEL. i got the solution

Normaly iam runing 17PSI
i just had one injector leaking and i have installed back the stock ones just for few days.
(before i get new ones )
Sorry you guys misunderstood me.

Maybe something wrong in my VAFC setup,
WHat do you guys mean by scaling?
Boost scale ca be either for NA cars or up to 1.5Bar or 2Bar
?
Anyway yesterday I didnt do it instead ive washed my car wish was more urgent, then that girl call me...
TOday i'll try to mount it and get ride of that missing link.
Thanx for the help
btw sorry for the diode spell but ive must have probably mistake it with the Ford Zhetec engine.
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Old 11-21-2003, 07:48 AM
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Default Re:How to read boost on VAFC with no CEL. i got the solution

You are attempting to tell us that you're running 17psi on stock 240cc injectors?

..interesting. Can you explain how to flow enough fuel to maintain ~12-13:1 air fuel ratio with the increased air density with 240cc injectors?

..also, what MAP sensor are you using?
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Old 11-21-2003, 12:54 PM
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Default Re:How to read boost on VAFC with no CEL. i got the solution

Originally Posted by TurboEF9
You are attempting to tell us that you're running 17psi on stock 240cc injectors?

..interesting. Can you explain how to flow enough fuel to maintain ~12-13:1 air fuel ratio with the increased air density with 240cc injectors?

..also, what MAP sensor are you using?
You are mega gay.
he said he has 450cc injectors but temporary 4 psi on stock jets.
If you can not respond to the basic question please just say nothing
Tomo_HC3D is offline  

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