Tuning with EGT

[Grant Crockett]

Has anybody done air-fuel mixture tuning with exhaust
gas temp rather than O2 sensor?  I have read that the
thermocouple has a much quicker reaction time to high
heat/lean fuel conditions than an O2 sensor.

If so, what are you getting for temperature readings? 
I am wondering what temps (deg F) would equate to
optimum performance, without detonation.

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