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AFC wiring for OBD-0

Old 05-22-2003, 08:33 PM
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Default AFC wiring for OBD-0

Ok I have an 86 crx si with a 86 teg vacuum advanced D16a1 engine (blew the ZC at the track) in it and the minor wiring changes have already been completed under the hood.

Currently I am running an SDS EIC, which suits my current needs. I am getting an engine built(already have the parts) and the SDS EIC won't be able to handle the amount of hp numbers I am aiming for, 250-300. I tried doing some research on the apexi AFC, but it was impossible to find anything on my car.

I have no problems wiring it in before the ECU only problem is that I do not know what wires from the AFC actually get hooked up to the ECU or if I can even use the AFC on my setup? I am only using the AFC to control the 450's. Retarding the timing will be taken care of courtesy of a full msd setup including a BTM.

Thanks for any help.
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Old 05-22-2003, 11:41 PM
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Default Re:AFC wiring for OBD-0

www.apexi.com has your wiring diagrams.

450cc will probably hit those numbers at the crank, not the wheels. Most LS turbo run out of steam at 230 whp... they run lean at 100% duty cycle above 8 psi and 5500 rpms. Go 550cc unless you like the sound of 230 whp max.
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Old 05-29-2003, 01:57 PM
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Default Re:AFC wiring for OBD-0

I've tried doing a bit more research on the AFC and my setup. I can get the afc to work well with my setup, although I obviously can't use it to retard my timing(have a BTM).

After following many of the other AFC converstions it appears as though my stock MAP won't be able to handle more than 5.0 volts or I will get a CEL.

You said in an earlier post:

"Really, just pick up an electronics catalog and look for "voltage regulators." The part you want is a "7803" which is a 3 volt positive voltage regulator. It has three pins and is impossible to miswire - power in, 3 volts out, and ground. It holds the MAP sensor input at a rock solid 3.0x volts."
Question: Does the regulator go after or before the afc?

So, if I were to run more than 9.25 psi couldn't I use the AFC hack and 3 volt regulator, which would keep me away from a CEL.
Then I could use my SDS EIC to turn on around 9lbs of boost that is good for up to another ~160hp with the proper fuel pressure?
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Old 05-30-2003, 06:54 AM
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Default Re:AFC wiring for OBD-0

You may not care about this but I'm running a JDM DOHC ZC in my 91' Civic HB which has a OBD 0 ECU in set-up ( I'm running a JDM ZC ECU PM7 too ) I'm getting my AFC today I'll let you know how the wire up goes.
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Old 05-30-2003, 08:20 PM
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Default Re:AFC wiring for OBD-0

Yeah definitely let me know how it goes.
Where did you get the AFC and for how much?
What injectors will you be using, 450's?

Originally Posted by DOHCZCEF9
You may not care about this but I'm running a JDM DOHC ZC in my 91' Civic HB which has a OBD 0 ECU in set-up ( I'm running a JDM ZC ECU PM7 too ) I'm getting my AFC today I'll let you know how the wire up goes.
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