I have this installed with the Greddy O2 sensor in the down pipe (at the top) and this thing just goes crazy and never shows an AFR worth a crap...

Anyone know how to make this particular expensive thing work at all?

Please, please refrain from telling me how much of a piece of crap this or any narrow band AFR gauge is as I have read all that (too late for that)...

I mean if this does not work, why sell it to the public and for such a price... If you can read the voltages on an AFC or use a simple LED gauge to show the general AFRs, this think has to do something outside just waffle back and forth for ~300 bucks...

Anyone know how to get something from this thing???

 

If it is a narrowband o2 sensor, then it is useless.

You now know why sometimes people like to refer to them as Greedy.

 

Well I assume it is a narrow band sensor, but I am not 100% sure. Anyone know?

For that cost I would had hoped it was a wideband sensor... If it is a narrow band sensor, can I replace the O2 sensor with a wideband O2 like the AEM sensor? Anyone know? I would like to figure out a way to get something from this guage...

 

I guess you could use a volt meter.

Narrow bands read 0-1 volt while widebands read 0-5 volts.

If its a narrowband, straight up, its useless.

And for a wideband sensor, you need a wideband controller.

 

It's just hard to imagine that everyone that has ever bought this guage was ripped off... The thing is for sale all over the net and there are even replacement O2 sensors for it... I simply can't imagine that they all just constantly jump all over the place and show not a single clear reading...

 

Marketing will make alot of people buy anything. But hey there might be some hope. If the sensor reads 0-5v you can use it for an LM-1 output gauge!

 

Well, I will not accept that this is some BS marketing... It should at least show some reading 100% accurate or not…

I just sent an email to GReddy (info@greddy.com) about this and will post my findings (good and bad) as such a product needs to work or not be sold; hopefully there will be good news.

The list price is $350 and you need to get an O2 bung welded for ~$50-80 to install it... I could have purchased a wideband unit from a number of other vendors for around this cost. I could also have simply used a cheap narrow band reader that would actually give a reading. As I said above, the AFC I have gives the O2 voltage that I can read and see some idea of AFR. The benefit of the warning / memory gauge is to be able to ac tually read it and record the highest readings, etc (I have the EGT and boost and they are great)....

Obviously a wideband unit is best... GReddy does not indicate anywhere that the $350 unit is not a wideband gauge/sensor, but I think it is a narrow band...

Again, if anyone has tried this gauge or knows others that have I would really be interested in those experiences.

 

I honestly don't even think it is possible to tune using narrow band. It's range of accuracy is only at 14.7 so anything below or past that will just give you random( bad choice of words) voltages.

 

This is what a narrowband o2 sensor reads/outputs.



As you can see, it will read accurately from about 14.3 to 15. If it gets a voltage reading outside those parameters it simply outputs "rich" or "lean".

The ECU only uses this to tune for idle, and cruising, where an AFR of 14.7 is ideal for fuel economy.

Once you go WOT, it goes into open loop operation and ignores the o2 sensor.

This is what you need to do any real tuning-



As you can see here, the readings are perfectly linear, and will be accurate from around 10 to 19.5.

You just need to realize that GReddy bent you over and move on to a proper wideband unit.

 

Thanks for the great information. I will look into a proper AFR meter... I will still push Greddy to explain this BS and to admit it is a POS...... At least I can use the bung for another sensor...

Any suggestions? Anything with a memory or a warning feature?

Thanks

 

PLX R-500.

$550 some odd bucks though, but on the same token, its bad ***.

The Zeitronix is nice.

For the money, I like the effectiveness and simplicity of my PLX M-250 and external gauge.

Check out importparts.com for the PLX Devices.

And TTP-Engineering.com for the Zeitronix.

 

The greddy a/f gauge definitely uses a narrowband o2 sensor. The o2 sensor is only four wires. I had one on my old GSX. This gauge came out quite a few years ago before widebands were readily available. It wasn't accurate worth a damn. This is definitely a "show" gauge.

This a/f gauge might be useful for n/a cars.

 

What about the AEM UGEO wideband setup? Seems reasonable in cost.

 

I think the gauge itself only reads down to an 11:1 AFR.

It does log below this, but as far as the gauge goes, thats all you will see.

Which is why I went with PLX, it's gauge will read down substantially further. (I forget exactly how low though.)