RomRaider

Not a problem, the 2L JDM 03 to 06 EJ20Y twinscroll motors had the O2 sensor after the turbo as well.

I was actually asking if the scaling (resistance / EGT) is off by a lot as the turbo surely pulls a lot of heat out of the exhaust.

Has anyone got any data on this from more recent cars? I have a GT86 but I assume the sensor will be the same as other modern models.

GT86 has probably another sensor or the ecu uses another control seetings.
You will probably see 40 ohm AirFuelSensorResistance in normal conditions and 30-35 under EGT extremes.
If you see 45-50 ohms under load the mixture is probably extremely rich.

Here's a log for you to look at, if you can make anything from it

Curious if you ended up finding out how the scale worked on those LGTs?

Sorry, no. I never did.

Cool! How do I know which generation of Denso AF sensor I have. I assume mine is first gen, I have a 2006 USDM WRX, i think it should have the first generation of 32bit ECU, as its the first year in the USA the ecu was 32 bit.

Also, I assume its possible in RomRaider to program in a parameter called Estimated Exhaust Gas temperature which live preforms the calculations mentioned here and displays the value.

16-bit was the first version where we had access to circuit resistance.

it's been a bit since i looked at a log of this value on the 32-bit sensor, but if I remember correctly, it's about 10 ohms over the older sensor.

USDM WRX06 is most probably 16 bit ecu.
In such a case the first generation Denso AF sensor is used.

It is not possible to make a correct AFS resistance to EGT conversion.
AFS heater current and prehistory may play the game.

Have a look at a heater current.
When it drops under full throttle AND AFS resistance drops you have an extreme EGT that should be avoided.
Enrich the mixture and find new knock limited optimal ignition timing for that particular Load\RPM point.

Hi - I've been wanting to convert the front 02 values to display an EGT value.

Does anyone know what the formula may be to come up with the EGT value from the front o2?

I have a Kenwood head unit with Maestro module that taps into CAN and has a gauge pack. The gauge pack has EGT value displayed.

The info they get from the OB2 is - diagnostic coming across diagnostic can lines.

OB2 wires used are 6 and 14 - high speed diag. can lines

3rd tap from Maestro to OB2 is sil data (for TPMS readings).