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Colortune or O2 sensor in exhaust bung for tuning? 120-130

I think my other choices are plug color, exhaust smell and SOTPants, which will always change. Are there any other indicators?

Plug color is vague. Exhaust smell and performance are subjective.
Colortune documentation indicates "mixture at idle".

With wideband o2, I figure I can narrow the variables to 2 and collapse them, at a given rpm/load/~~, then see where it goes and spin my needles as required.

The Simons headpipe collector is way down the pipes.
--
MPergiel, Walker, MI






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