SaabGuy

I recently recieved an AEM single channel wide band o2 sensor setup for $360 bux shipped. This setup came with the control unit and LSU4.2 wideband sensor. So far it has worked out to the highest of standards.

I do not have a proper display for this unit as of yet; I am using a Fluke digital multimeter which is kind of slow reacting.

I am in the process of tuning my car with this device. Is this wideband o2 something that I can rely on to give me acurate a/f values? In the manual the specs say withing .06% which is %99.94 acurate for the sensor alone, and a +/- .1 a/f for the entire setup.

two thumbs up!

SaabGuy

Oh heres my mods

DCrosby

Depends ond how secure you feel in your tuning skills

But sure... the wideband will tell you accurate AFR's as long as you know what you're looking at with your multimeter... I assume you calculated out what the voltage range is or what sort of values you're getting from the range... I.E. 3V = 13/1 Ratio !?
Not that I'm stating that that's correct you just might want to make tripple sure you know what you're looking at without an AFR Display.

-DC

SaabGuy

The manual for the AEM cross referenced the a/f's to voltage. I made a nice visible excel spreadsheet crossreferencing the values as well.

It is actually becomming second nature looking at the volt meter. 4v = 14.7af, 2.5v = about 11.5af and so on.

DCrosby

If you feel comfortable with that, go for it.. I'm just not sure what you're trying to do...
If you're doing some hard core tuning I'd be sceptical... to rely on the voltmeter... but If you're just trying to see what's going on in the rotor housing... it's probhably not a bad reference...

-DC

TailHappy

I got one for use with my PFC and datalogit. I'm still skeptical though. How steady are your readings? I'll get 3 or 5 that are within a few tenths of each other, and then a reading that's like 3 full points away. Are you using the signal ground? I've found that subtracting it from the original voltage seems to just make my readings even worse. I'm not sure if the electronics or sensor are giving bad values, or if maybe something like bad plugs or injectors are causing the fluctuations.

rx7tt95

The AEM unit does use a different wide band model from the Datalogit which I believe is faster reacting? I have the datalogit and Techedge WB (1.0) and I often have some of the same concerns as you Tailhappy. It seems to be working pretty well for me however. I use lots of other data such as knock, sensors, timing, etc..to tune. seems like my biggest beef is the logging speed. Not sure where the bottle is...I get about 5 samples per second or so.

From reading all the stuff on the AEM board, it seems like you can type in the target a/f ratio and the wideband/ECU will do the rest. Should be simple as pie. Are you guys able to log knock and all other engine parameters along with a/f?

TailHappy

Yeah, I'm just getting about 5 samples/second too. I'm only running my datalogit on a P120, so I thought maybe my laptop was the bottleneck, but now it sounds like that's not the case.