AEM WIDEBAND AND POWER FC

[vvti16v]

I'm looking to buy a AEM wideband ebay to make sure my AFR are correct for safe boosting........please correct me if i'm wrong....the existing o2 sensor still gets connected to the PFC but this new sensor just gets connected to the gauge? Is it possible to also replace the existing narrowband with a wideband sensor?

thanks

Edited September 29, 2009 by vvti16v

[chicaboo]

Hi mate, I've had 2 of these now. For starters, let me just say that they are very very accurate due to their Bosch UEGO sensor. They also have multiple lambda modes including Autronic emulation. I found the standard UEGO mode was spot on with the Autronic sniffer in any case...

Well, back to your question. You run the EUGO straight to the AEM gauge. I think my current one for the TX3 has an output for engine management, but I'm pretty sure the PFC doesn't support this [citation needed :P].

Cheers, Gav.

[Guest]

I don't have an AEM personally (i have a zeitronix, but the principal is the same, and they use the same sensor)

I know for a fact the zeitronix has a 'narrowband emulation output', meaning that you can use that to connect to the PowerFC and ditch the old narrowband sensor.

(from memory, the AEM has one too)

That said, some ECU's do not like the output from these and will throw CEL's or just not switch between open/closed loop. It works fine on my 5s's ecu, and i have seen it done on a PFC used with a 3sgte, so i cant imagine you would have too much drama.

[chicaboo]

Oh yes, one of the output modulations on the AEM is narroband. I don't know if this means the display on the gauge changes to narrowband [oscilating] however.

Gav.

[SuperDave]

I'm not of much help either as I use two o2 sensors in my car (using Techedge myself). Do the calibration and it'll be fine.

Some info on widebands on newcelica and running narrowband emulation,http://newcelica.org/forums/showthread.php?t=188457

[Guest]

But my wideband can output 0-1V, can't I just use that signal?

There are mixed reviews on this working or not. The AEM gauge-type has five programmable outputs, with two of those being 0-1V emulations. My car with a factory ECU would not work with either of those emulations running. There's also a very good reason not to do this, even if you could get it working: you will lose the 5V resolution on most widebands. Most wideband controllers have only one output, so if you select 0-1V, you will not be able to monitor the 0-5V signal. The exceptions are the AEM dual-channel, which has both a 0-1 and 0-5V output, but no gauge display (although the gauge is now offered separately) and the units from Innovative Motorsports. Considering that people have not been able to get the car running with the 0-1V emulation on the AEM gauge-type, buying the expensive dual-channel model seems like a big risk. So my advice is to not try this if you use the AEM unit. With the Innovative wideband, people have had success running the Celica, but have reported AFR instability at idle and have reverted back to the stock O2 sensor for ECU readings. It would seem that while in Innovative emulation is better than AEM's, it is still not suitable to make the car run properly. This could cause major problems when you try and pass emissions, as you would need to run the stock ECU and the unsteady AFR could cause a check engine light.

as you can see from there, the factory 2zz ecu's dont seem to like the narroband emulation feature of the AEM... but once again, this does not mean the powerfc wont work with it.

and by the looks of it, you lose your analog output if you use the aem gauge type wideband.

the ZT2 that i have has the following outputs

1x Narrowband Emu Channel

1x 0-5v Analog output

1x RS232 Serial Output (laptop, datalogger, etc)

1x LCD Display output (AFR, Lambda, Boost, TPS, etc)

so perhaps look at getting something like the ZT2 or another wideband with more than one channel if you are interested in ditching your stock narrowband.

[CHA54]

To do anything usefull with the wideband and powerfc, you connect the widebands 0-5V linear output to the datalogit, preferably with a differential output (sensor ground and signal both wired to datalogit inputs.)

Do you have o2 feedback enabled with the powerfc? quite a few tuners disable it.

You can replace the stock sensor with the wideband if you want, just use the 0-1V narrowband emulation and wire that in place of the stock o2 sensor signal wire at the ECU plug. The powerfc isn't anywhere near as picky as the stock ECU for it's narrowband input.