I´ve been recently holding back my settings, since my calculated EGTs have been extremely high.
The readings were suspiciously high (up to 1160°C taikr_w) and there was no real technical reason for them to be high in the first place.
The high readings prevented me from tuning the fuelling in the right way since KFLBTS was continuously activating due taikr_w limit being exceeded.
It is a known fact that the stock exhaust gas temperature model is accurate only with the stock hardware.
My car (A3 quattro with AXX engine) has following changes:
- F23T with experimental anti-surge billet compressor (pre mixed-flow)
- 3" DP with 200 cell cat + 3" non-resonated cat-back
- S3 FMIC
- S3 injectors & Autotech HPFP
The front lambda was recently replaced with a brand new Bosch unit, but it made no difference on the calculated temperatures.
To figure out the truth, I went a head and ordered a Omega made USB thermometer and a K-type EGT probe.
The probe was tapped into the downpipe flange chamber (post turbine).
After several warm-up runs to the limiter the result was already quite obvious.
The highest reading recorded by the thermometer logging software was 796°C.
It was recorded at 6900rpm with 0.97bar of boost and 0.77 lambda (KFLBTS "interference"). At the same point taikr_w was reading 1070°C without ever dropping below 1020°C after 5000rpm.
I knew it was going to be off, but not nearly by that much
If the EGT model would be even remotely correct with the changed hardware, the default KFLBTS activation limit (taikr) of 800°C doesn´t sound too bad
