is it possible to tune a SAFC with an AEM wideband, then uninstall the complete AEM unit? will the SAFC settings still be accurate?
E
it will be accurate until the weather changes
so wouldn’t it be similar to sticking a wideband O2 in the muffler on a dyno? you’re telling me that when you leave the dyno, your tuning gets facked?
No what he means is when the weather changes…
For example… above/below sea level. If you tune your car for above sea level but then for some reason ship it across the country where you are now below sea level, the AFR will change slightly.
I realize that having the wideband quage there would tell me when/if my AFR changes under certain circumstances (weather, bad fuel pump), but what’s the difference between the sensors themselves?
Nothing.
A dyno shop might sometimes use a more expensive sensor than your standard LSU-4 but for all intents and purposes it’s the same.
so then back to my original question… can I safely uninstall the AEM UEGO after my car is tuned?
Yes you can but not recomanded.
I use to have my wideband in the car for the whole summer , The setting never changed and I was still seen 11’s under boost,
I haven’t touch my safc2 after it was tuned because the air/fuel were to same everytime.
The only reason why I kept it in the car is to be able to diagnose a problem before shit start to blow up.
IE: plug injector, faulty fuel pressure , bad fuel pump , bad maf , foulled spark plugs.
Some people I know, even tuned, will not boost their car without a wideband reading.
Cold day/ warm day will see a variation as much as .5 on the wideband but that’s it.
heres something i’ve always wondered… how the hell does the wideband in the tailpipe work for tuning on a dyno if you have a cat? an O2 sensor just measures the amount of oxygen in the exhaust, but the cat uses up the O2 when it converts the exhaust gases so if my thinking is correct it would throw the reading waaaaaayyy off.
I was thinking the same thing because even in the manual for my zeitronix unit it clear states (place probe 12’’ away from turbo BUT BEFORE the cat to ensure a proper reading).
So I as well was wondering how much the reading changes with the probe stuck in the end of the exhaust etc etc
your aem has nothin to do with the safc. they are both seperate units.
^ I realize that, but I was wondering if the O2 sensors are different in any way…
for example, if I tune with the wideband, then immediately reinstall the OEM narrowband sensor… the AFR should not change, correct?
your aem unit shouldn’t be replacing your factory unit.
The aem unit should be plummed into your pipping along with the factory one.
The wideband sensor goes right to the gauge. Your ecu uses the other one still.
The wide band is good because it senses more. So you tuned your car with the safc which is just chaning the air fuel signals that your ecu gets. It really has nothing to do with the wide band os sensor.
A wide band send a signal ranging from 0 to 5 depending on your A/F ratio and a regular O2 sensor sends a signal from 0 to 1 volt dont know if that helps you out.
basically a regular O2 sensor just tells you if your lean or rich but not by how much and a wide band can actually tell the ECM how lean or how rich you are running
^ the AEM wideband has an extra wire to send a narrowband signal to the ECU… you can install the wideband sensor in place of the Primary O2 on the Turbo elbow and it works fine… it would work a bit better farther from the turbo, but it still works regardless.
my bro’s car is running perfect with the above setup…
thats cool didnt know that what a good idea to have a sensor that can send both signals i’m impressed
That is kinda handy.
so just put the old one back in and you can remove the wide band. I say leave it in tho 
^ true, it’s like $300 for peace of mind…
thats true… but what are you going to do sell it? what happens if you ever change anything on the motor again and need to retune. going to have to find one again I woudl think.
my bros each have one, so I can just borrow their’s…
E