Long version:
I want to monitor the A/F mixture on an FJ20 Turbo with a Haltech F9 EMS. I was looking at the "Haltuner" on the Haltech www which appears to be a LED meter and the sensor is clipped on the exahaust pipe on the rear - local distributor in Canberra said the fresh air or clean air? sensor can be unreliable in this set-up (i don't fully understand what he was saying and assumed there is a fresh air measurment used to compare to the exhaust gas measurement? and the fresh air one sucks in exhaust which fouls its readings?)
I was wondering about the factory exhaust sensor - if it works like my other haltech sensors then could I measure resistance from it? Problem is knowing what they meant and without its specs I tuning blind. The workshop said I can use this exhaust sensor, but i wonder would it be calibrated to suit a Haltech? In any case the $330 upgrade to the F9A would give me closed-loop exhaust sensing, but this still doesn't allow full tuning as it's only a trim adjustment on existing fuel maps. However if this close-loop system is reporting the mixtures to the datalogging mode of the software then it is what I'm looking for.
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