I've never dealt with installing a wideband O2 gauge on a newer vehicle that has stock wideband O2 sensors in the exhaust. With older cars you merely added a wideband O2 sensor into your exhaust and used that for your gauge, and if you're installing a narrowband gauge all you had to do was tap into the stock narrowband O2 sensor.

What do you do with a car that has stock wideband sensors? Can you merely tap into them for your gauge or do you have to add another just for the gauge? Has anyone done this?

 

Hymee's sCANalyser can show wideband o2.... it is part of the CAN scanner function.

I suspect the similar think in Blitz will have this. But those aftermarket ones will have CAN protocol.
This is an example in Japanese.
http://www.blitz.co.jp/products/electonic/r-vitfit.htm

They will have the same function as a CAN scanner if they are in CAN protocol. :0

 

There are different types of wide band lambda sensors. I frequently use two types :
- NTK UEGO
- Bosch LSU
They are incompatible and require dedicated control modules and signal converters in order to obtain a useable signal (like 0-5 V or 0-1 V).

I had a look at the RX8 wide band sensor but it seems to be another kind of wide band sensor and I have no idea which signal it returns. Even if it were say 0-5V, I still wouldn't know the transfer function to convert that signal into AFR or lambda.

So the easiest way to work is to tap an extra sensor in there with a gauge. There are plenty of them available now on the market at decent prices. And they usually come as a kit with a gauge anyway.

Hope it helps,

Fabrice

 

Fabrice, the PCM reports a current (rather than voltage) reading from the Wideband O2 sensor (and this is what is required in the OBD spec). You can set this in the Options for sCANalyser if you want to see the report values.

 

The pump cell of older NTKs also gave a current signal. Now it is a voltage signal.

I don't know if that current signal could be used on an Amp meter with an adjusted scale that would read AFRs. I'll have a look on my super beta-test Australian-sourced Hymee sCANanalyser OBD scan tool interface converter adaptor...

Worth a try though. And I'd fit a flat LCD display to replace to soon to be useless fake pressure gauge (as I'm soon going to install a real oil temp and pressure gauges).

Fabrice