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AFC hack question at IDLE!!!

Old 03-30-2004, 09:57 PM
  #1  
1.5 BAR
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Default AFC hack question at IDLE!!!

Okay i got dsm 450cc injectors on the V-AFC... i'm not sure if my Air/Fuel ratio gauge works but at idle it says EXTREMELY rich even at -%50 across the board for LO-TH on the V-AFC. is this right? let me know for sure
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Old 03-30-2004, 09:58 PM
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Default Re:AFC hack question at IDLE!!!

That gauge is ----. It isn't worth looking at unless you are at WOT because the ecu is doing so much adjusting and ----.

That doesn't sound right though. Mine bounced all over hell. Are you sure you have it hooked up right?
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Old 03-30-2004, 10:00 PM
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Default Re:AFC hack question at IDLE!!!

like i said i dunno if its hooked up right on my 91 si wire harness isn't it the WHITE wire? cuz for OBD-0 on these engines the o2 sensor is just 1 wire.. or that i use or know of.... if not, what other wire is there?
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Old 03-30-2004, 10:02 PM
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Default Re:AFC hack question at IDLE!!!

I don't think the AFC touches the oxygen sensor wire at all? Or are you talking about the accuracy of your gauge?

Don't trust those at all. They won't give you a reading worth a ----.

How are the RPMs at idle? Also does it SMELL like you're running rich?
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Old 03-30-2004, 10:05 PM
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Default Re:AFC hack question at IDLE!!!

haha well..... right now i'm on an open downpipe, the downpipe should be made in a week hopefully. i think in the AFC FAQ it says at only HI-TH on the AFC... what about LO-TH? also what wire do i hook up the A/F gauge up to on my 91 si wire harness... the white wire? thats the wire i use to hook up the o2 sensor.. no CEL.
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Old 03-30-2004, 10:15 PM
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Default Re:AFC hack question at IDLE!!!

I'm not sure what color your O2 sensor wire is, so I won't attempt to guess. On my OBD2 it was brown I believe, or purple. ---- if I remember.

You want to set both your hi and lo throttle to -40% and adjust it bit for bit at each RPM interval.

The general 'cross over' point is at 75% because I think thats when the ECU actually considers you switching from lo to hi throttle.
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Old 03-30-2004, 10:18 PM
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Default Re:AFC hack question at IDLE!!!

maybe this is why i have to hold the throttle to keep it running.. i'm on LO-TH at -50% across the board.. so i'm not even giving enough fuel than stock, correct?
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Old 03-30-2004, 10:21 PM
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Default Re:AFC hack question at IDLE!!!

At idle I'm running -35% at both hi and lo
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Old 03-30-2004, 10:24 PM
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Default Re:AFC hack question at IDLE!!!

Originally Posted by Chacko
At idle I'm running -35% at both hi and lo
that is a lot of fuel for 440/450 injectors. Why so rich off-boost?
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Old 03-30-2004, 10:37 PM
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Default Re:AFC hack question at IDLE!!!

If I don't set it that high I have a fucked up idle, I think its because of the BoV trying to adjust itself, but in any event this keeps the engine RPMs up and strong at idle.
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