From Hondata, found in K-pro Forums: http://www.hondata.net/forum/viewtopic.php...=secondary++plx

"Narrow band o2 sensors work by the difference in oxygen levels between the exhaust gas and outside air creating a voltage difference across a ZrO2 Nernst cell. They don't require any power to produce an output, and the ECU can just read the voltage from the narrow band sensor.

Wideband o2 sensors add an oxygen pump cell and reference cell with heater to the Nernst cell. A controller regulates the current through the oxygen pump cell and also the heater current. The ECU cannot read a wideband sensor and there must use a wideband controller to run the o2 sensor. The wideband o2 sensor does not produce a voltage, but rather the amount of current through the oxygen cell tells us the AF ratio. The amount of current varies by o2 sensor but some are as low as +- 1mA full scale.

The difficulty is that the wideband controller must be matched to the o2 sensor. The reason is that the amount of cell current and heater current is critical for the life of the o2 sensor. Cold start current regulation is very important and it actually is possible to destroy an o2 sensor in a single cold start. This is why we do not recommend that people wire in anything at all to the o2 sensor wiring. An external AF meter will not read the wideband o2 correctly, and more than likely will consume enough current to throw off the reading drastically. Swapping o2 sensors is equally as hazardous.

To replace the RSX o2 you will need to find an exact equivalent o2 sensor, as the wideband controller electronics is integral with the ECU and cannot be replaced nor altered. The other options would be to run a cheap narrowband o2 sensor, and use the secondary o2 sensor input for closed loop (which you will be able to do for the next KManager release), or to use an external wideband controller which uses a cheaper wideband sensor and feed the analog output from it into the secondary o2 sensor input as above."

 

Ok so basically I can use the wideband, but I can not run the car off of the wideband like I can with the EMS...it would only be there for datalogging purposes and in general, not that useful.

 

The factory o2 sensor is wideband...you don't need another one. K-pro datalogs with the factory unit. If you want to have a guage in your car you can install your PLX/AEM/NGK unit seperate, upstream from the cat.
That is the beauty of the K-pro system, it uses the factory components

 

You don't need to "Run your car from it"m the primary O2 Sensor is enough for the Hondata to run the car in closed loop. This is what the EMS does with a wideband and only a wideband. So unless you want wideband data, and it is usefull, you don't need it.

Now that is useful is it not?

The factory S2000 primary o2 sensor is NOT a wideband. It is Narrow. If you look back on this thread, Hondata posted so. But it is enough to run the car in closed loop.

 

You are right, I stand corrected. Damn S2000 lol...there is hope though:
"Using a wideband RSX oxygen sensor is not recommended because the oxygen sensor is expensive (as much as an aftermarket wideband) and substantial re-wiring is required."
The good news is that you can use the RSX o2, just needs to be rewired, shouldn't be that difficult. Stratocaster, do you happen to know the color and number of wires on the S2000 primary o2 sensor?
Perhaps Hondata will shed some light on this option for us...

 

Good widebands have an analog output. Really good widebands have two. You can feed this analog output into the ECU to eliminate the stock primary o2 sensor completely. If you have a wideband with two analog outputs you can use the first to run the car (as a simulated narrow band) and the second for datalogging (as a wideband). The AEM has one analog output, which just means that you should use the stock o2 sensor to run the ECU and the AEM output for datalogging. If you wish you could use the AEM output set to narrowband to run the ECU, but then you have no datalogging of the AF.

It makes no sense to use the RSX wideband. There's 4 wires to the S2000 O2 and 4 wires to the RSX o2, but there are wired completely differently. First, you have to know what you are doing. As soon as someone asks about wire colors I always cring. Wires have functions, not colors. The wires from the ECU to O2 sensor go through 3 connectors and 2-4 color changes for each wire. Sometimes the wire which is white at the o2 will turn green in the middle portion, and the wire which is green at the o2 will be red when it reaches the ECU. Anyhow, to wire up the RSX o2 you will need the ETM for the S2000 and ETM for the RSX, the manuals for each vehicle, the RSX o2 sensor, some wiring which will handle the heat near the exhaust, a relay, some connectors, and most importantly, the knowledge of how to do it. The above parts will cost about $300, assuming you have the manuals. For $300 you can get an aftermarket wideband which is going to be much easier to get going, has a display, and uses cheaper o2 sensors if you need to replace them. This is the logic behind our advice.

 

Added photos to the first post:

 

Impressive! Remnds me of an OEM ECU except with "HONDATA" written on it

 

Looks vaguely familiar to the ECU in my wife's Civic. I can't tell you how happy my wife and I are with your products. I am very glad to see that the S2000 community is going to enjoy them as well.

 

Yes but, who actually pays that much? The 1052U is readily found for ~1300 every week or so in the FS forums.