Quote:
Originally Posted by Old Mechanic
but I guess that would make too much sense.
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Yep, and that would be punishable by law that's there to protect us.
I do not tune professionally, or I would be quite unable to post the things that I have. My active contributions have been towards special projects only, and have mostly been limited to performance/track cars.
A track car also has a great interest in running lean at part-throttle to keep the plugs clean and unfouled when the time comes for WOT.
Factory tunes also introduce a level of inconsistency that many racers don't want, and the use of O2 sensors mean that race fuel with certain additives cannot also be used.
That explains the necessity for lean open-loop tunes.
I have used switchable potentiometers many times in order for a user to make temporary adjustments on the fly to either fuel, spark, or both.
It comes in very handy for many things from cold-starts, to using different home-blends of fuel.