AFC settings. Something doesn't seem right
 

I was tuning my old Civic this weekend and something doesn't seem right. I'm using a PLX300 wideband and the wideband says the car is running rich but about 3500rpm's I have everything at -35. The AFR drops steadily until its rich. I though it was becuase the timing was too far retarted but I set the timing to stock and gapped the plugs to .028 There's still a little bit of breakup above 7000 but I don't want to take out more fuel cause something doesn't seem right. The setup is:

-D16Z6 2mm head gasket 8.0:1 compression
-T3 .42/.48
-8.5 JRC intercooler
-DSM 450's AFC hack
-Crane cam ignition w/ external coil



At -35 and the wideband says it running rich, whats going on?

Re: AFC settings. Something doesn't seem right
 

it could be, i don't remember my settings exactly, but for the majority of my tune i'm around -37 on the high end i believe. Down low around 3K i'm at like -44, and i even had to bring it as low as -48 at idle.

Re: AFC settings. Something doesn't seem right
 

What was your AFR? did you use a wideband?

Re: AFC settings. Something doesn't seem right
 

wait... is this a really old post or what? i was sure the great and powerful whitey would know how an afc hack works

Re: AFC settings. Something doesn't seem right
 

nah i haven't had a chance to yet. I wanna get it on a dyno but i wanted to wait for the ------- monsoon to blow over. I have a narrowband A/F gauge and my apexi TT is able to extrapolate an A/F reading based on O2 sensor voltage, which, isn't accurate worth ----. But somehow i have a feeling that it's tuned decently. The WOT is rich as ---- and i carefully leaned out the bottom end by street tuning, and because the idle sucked. Just go slow with it. Also, check your O2 sensors. Mine fouled out and cause my car to run like hammered ----, which also caused misfires on all 4 cylinders. Basically, ECU sensed no O2 sensor, went into open loop mode, and dumped in ---- loads of fuel to compensate.

Re: AFC settings. Something doesn't seem right
 

Yes I know how the hack works, thats why I made this post becuase to me it seems like I shouldn't be takeing out that much fuel. But thanks for the helpful post ::)

Re: AFC settings. Something doesn't seem right
 

How much boost are you running and how much boost is it getting at 3500?
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Re: AFC settings. Something doesn't seem right
 

around 7 and it maxes out at 7

Re: AFC settings. Something doesn't seem right
 

damn this is a slow forum...

Re: AFC settings. Something doesn't seem right
 

remove more fuel man and go from there

i had rx7 460cc injectors running at -37 and it was pretty damn rich lemme tell u
not tuned

Re: AFC settings. Something doesn't seem right
 

I had mine dropped down to -34 at 3500rpm at wot and it was only around 13.5:1 afr ??? God i really hate these vafc's :P Top end of my rpm usually blows a cel for the map sensor...-28 @8psi @ 7500rpm...somethings fucked up :-\

Re: AFC settings. Something doesn't seem right
 

aanyone else?

Re: AFC settings. Something doesn't seem right
 

I would trust the wideband over the AFC. Take the plugs out and see what they look like. If it looks like it might actually be rich, take some more fuel out. :-\ I don't know how much you can actually "tune" an AFC to perfection though. :-\
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Re: AFC settings. Something doesn't seem right
 

if the wideband says you're rich, then you're rich, take more fuel out ;)