SAFC + Wideband = confused
 

lol.
took my car for a few runs to tune via the safc2

i found that when i put say.. +10 it actually leaned out the car, and vise versa with -10

so in order to richen the whole rpm map, i had to put all - values..
this is a NA 1986 GXL


any ideas?

Betcha' you have the wrong AFM type set. :)

hrmm.. what should it be set too?
im sure i triple checked all the settings, and i thought i had them all loaded in to my knowlege..

Flap. You'rs is probably set to hot-wire.

I talked to foild about this on AIM already but interestingly enough when I installed my SAFC and got it dyno tuned the first time mine was doing the exact same thing. I set mine up via the how-to on 1300cc.com so I was pretty sure everything was right, plus the tuner looked over it and said everything was fine. He also thought it was weird that it was doing this (corrections worked backwards). The wideband on the dyno was showing the mixtures getting richer with subtracting fuel and leaner with adding, go figure.

But then when I did my emissions test and I subtracted as much fuel as I could where the car still ran, my emissions went down. So I am really confused about it too :)

lol good way to blow a seal. "your hella lean! add more fuel quick!!!!" *loud explosion* "what happened?" *shrug*


settings are 4cyl Up arrow, 5in 5out(s4) 6in 6out(s5) and flap

i cant get to my car right now.. but i am almost 100% sure it is flap

if i do have it set to flap... any ideas on why this would be happening?

damn I hope mines not doing it right now? if so I'm about to ruin my engine. It says rich on my a/f meter

I personally don't know how on earth it could do that. The wires for the AFM signal can't exactly be inversed because only one gives an output so if they were backwards it wouldn't give an AFM signal.

Your ecu is pissed at you because you're lieing to it.

- Steiner

xactly.
WTF is goin on here..
since i have a wideband, regaurdless of what it says on the safc2, i am running at 13 afr at open throttle, so im not worried...
but what i am worried for, is people with turbos, who will do the same thing as i did (i e keep "adding" fuel, untill it gets to 20 AFR lol.. and then their engine goes pop.
what im just concerned about, is i would like it to read + values if i am adding, and - if i am decreasing.. for state of mind

:rlaugh:

quote of the day!
ROTFL
Matt:)

Too bad it's true

- Steiner

i doubt that

so.. i guess me and ddub are the only ones experiencng this prob?

Taking the signal the ecu is supposed to read and altering to tell it something different, is lieing to the ecu. I wouldn't trust a system like that when every other signal the ecu gets is correct for a specific load, rpm, ect except one critical component.

- Steiner

well, lots of people use the apexi safc
they seem to work for everyone excpet me and ddub

Doesn't seem too major to me, as long as the wideband shows you the AFR then we're fine because we'll know what's going on.

yep i guess soo :)

It manually changes the AFM output to the ECU, by user configured settings. Its not tricking or ignoring the ECU in any way, it is altering the AFM.

On MAF mustangs, when you upgrade the fuel injectors, you change out the MAF to one calibrated to your injector sizing.
This is doing the exact same thing: Calibrating the AFM, only it gives two calibration levels: low and high.

Since no two stock air flow meters give identical resistance loads, I guess swapping out your AFM for one from a different RX-7 is also lying to the ECU?

I never said it igored the ecu. It is still telling the ecu something different than what is actually happening and being read.

- Steiner

It alters the AFM signal... how do you even know your AFM signal to be correct in the first place?
Example: Swapping out stock AFM's, and nothing else, using a stock ECU on an N/A, gave an AFR variance of 0.3 under load, no other changes.

I could see you saying this about FCD's, but the S-AFC is no more of a lie to the ECU than the stock system.

my thoughts, only in inteligent words.
thank you scathcart

Why should there be any deviance in a stock system. Obviously things are going to be different for each car, no manufacturer has that nor ever will have that down perfect. An FCD is lieing as well, it tells the ecu that it is at a different boost level, is that not lieing? How is the stock setup lieing to the ecu if that's the way the ecu was programmed to run, and it is getting the signals it is supposed to be getting?

- Steiner