Anybody currently have one or recommend a specific model or brand? I am not looking for anything fancy or expensive, but something that will atleast tell me my a/f ratio. Thanks.

 

im curently useing the aem wideband

 

Nice, sounds like a quality product. Are you completely satisfied with it? Pros? Cons?

Also, would I need a new bung welded in correct?

 

don't bother with the autometer a/f gauges. Get the AEM wideband and yes, you will have to have a bung welded.

 

Cool thats what I needed to know. Thanks for the heads up, I'll stay away from autometer. The AEM seems to be very popular. I remember seeing a a/f digital display and I believe it was simply wired to the ECU. Can't remember what kind it was but what is the difference? Is one more accurate than the other?

 

The one that's wired up directly to the stock ECU is not a wideband at all. It's just a fancy gauge with a bunch of lights that reads the stock narrowband sensor. Very useless data if you plan to do any real tuning. I heard that the AEM gauges were made by autometer...not 100% sure about that but that's what someone told me. I'd personally stay away from the AEM. I've heard of reliability and inaccuracy issues with them, but I've never actually had an AEM unit I was working with fail on me.

The main thing I don't like about them is how wildly the readings jump around so it's hard to get a solid reading just by eyeing it. You need to datalog the readings to accurately see what's going on, but that's how you're supposed to do real tuning anyway heh. Also, the unit runs very hot...hot enough to warp and melt the rear casing on the unit(maybe the possibly cause of AEM wbO2 unit failures). I'm about to put it to the AEM to an accuracy test pretty soon here. I'm tuning someone elses car that has the AEM. I'm gonna screw my own brand new Wideband O2 into the extra bung to compare results.

 

that would be a nice comparison