Mongo

I'm going to be updating my O2 sensor so that it will be compatible with TecGT in the months to come. AEM makes a wideband oxygen sensor kit that supposedly can mimic the narrowband signal of 0-1v necessary for the LH to read correctly. Anyone using this same setup on their stock 928?

Also, does anyone else use a different wideband o2 setup that converts the signal into narrow band?

RKD in OKC

Typically the narrow band output is not very good and much better to just keep the stock narrowband and add a wideband.

Kevin Michael

What RKD said. drill and weld an additional bung on the cross at the cats. Plumb your wide band there by its self. I am running the AEM uego and it is an excellent reference.

Mongo

Unfortunately, that same spot is drilled on my X-pipe for the original O2 sensor. The only other option would be to tap one of the banks of the exhaust piping, but that wouldn't give me an accurate reading on both engine banks.

jorj7

I have one O2 sensor in the middle of the X and one on passenger side down pipe.
During one of the dyno sessions, we put a 2nd wideband in (temporarily replacing
the narrowband) and compared the two readings. They were pretty much the same
(within .1) all the time. So it shouldn't be a problem to do it this way.

Mongo

Are you running the wideband on the passenger pipe, or the original narrowband sensor directly to the LH?

jorj7

I was running the wideband in the middle and the narrowband on the passenger side going
to the LH. The last time we changed the cats (for smog test) the positions were reversed.
It didn't seem to make a difference, though I'll probably switch it back the next time around.

jcorenman

Andy,

We have a TechEdge WBO2 on the GT (www.wbo2.com) and use it for an ST. I like it, works well and seems well-engineered (better attention to grounds than, say, the Innovate). It has a simulated-nbO2 output (as do most, I believe), but we are using the original NBO2 sensor for the LH. That car has a Louie Ott-pipe with the NBO2 located at the "X", sampling both sides. I added a bung on the pass-side downstream from the "X" so it also gets mixed gases.

One advantage to a separate NBO2 is diagnostics: If the WBO2 wanders around 14.7 once the car is warmed up, then you know that (1) the NBO2 sensor is working (i.e. the LH is running in closed-loop mode) and (2) both the NBO2 and WBO2 are in calibration (or both off equally, which is unlikely given the different construction).

There is another potential problem with the sim-NBO2 output: On a warm restart the LH waits a bit (around 20 seconds I think) before going into closed-loop mode. (On a cold start it waits until the car is warmed up). The WBO2 sensor needs some warmup time, and until warmed up the sim-O2 output sits at zero volts which indicates too-lean. So if the LH goes closed-loop before the WBO2 is warmed up then the engine goes too-rich and stalls as the LH tries to compensate. It's a happenstance thing, I don't know how often it happens in real life.

I think you could also make a good argument to fit a test-bung on either side, upstream from the "X", for troubleshooting-- to be able to temporarily fit a WBO2 to either side to check for weak or leaking fuel injectors, etc.

Cheers, Jim

DR

We sell the Innovate WBO2 Systems and use them with our SC systems etc.. We have had excellent experience with theie stuff for 4 years or longer. They do have 2 programmable analog outputs that can be programmed to simulate the Narrow band for your stock computer. Personally I prefer to use the stock narrow band sensor for the engine computers and a WBo2 for gauges and SharkTuning.

Check www.928tuner.com for details on some the WBO2 stuff we use.

Mongo

Per recommendations on here, I would rather not try and mimic a narrow band signal from this AEM gauge. I'll do a separate install for sure. I'm going to crawl under the car to reassess the amount of space that I have. When the weld-in X-pipe was done with my exhaust system, they tapped the X in the center, upstream where the downpipes merge for the O2 sensor. I am hoping there will be some space to fit it.

dprantl

I use the TechEdge 2J1. I haven't had any problems using the narrowband emulation on my GT. I was using my stock narrow band O2 until it crapped out so I just switched to the emulation and passed emissions with flying colors. The 2J1 is by far the cheapest wbO2 solution that has RPM logging and you have access to all the intricacies if you wish. It is even possible to upload a different emulation map and fool the ECU into doing what you want. Their displays are also completely customizable. I have mine showing AFR, knock, boost/vacuum and RPM.

Dan
'91 928GT S/C 475hp/460lb.ft

Jim Morton

Andy

Jim Corenman brings up some good points to consider when using narrow band simluated output from a WBO2 controller. A lot depends on what circumstances you choose to use the WBO2 in the car, tuning only or full time use.

It's too bad you left SITP early as you could have seen both a Techedge WBO2 unit (mine) as well as George Suennen's Innovate LM-1 working with Sharktuner as well as the WBO2 units own software, Innovate vs. WinLog.

IMHO, there are choices that make these units attractive to perspective buyers depending on planned use. Some WBO2 systems have built in logging tools, guages, etc. while some allow you to fine calibrate sensors / curves as well as controller compatibility to the various WBO2 sensors themselves, Bosch (4.2, 4.9, LSU11) vs. NTK.

Bottomline, consider seeking out folks that own these different systems, maybe attend a dyno session and become familiar with the options. You'll likely hone in on what you like very similarly to why you are choosing the TecGT for engine management.

Enjoy.

Mongo

Hopefully there will be another event coming up soon so that I can attend and see the setups these guys run.

Brett928S2

Hi

I am using a UEGO (SEE PICTURE) its fitted in the X of my X-Pipes and works fine...



All the best Brett

Mongo

Is this an additional sensor Brett, or are you emulating the NB signal from the WB O2?