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I normally use air density to change up or down one jet from my baseline that my engine builder used when it was rebuild. I went to a track that had a long straight. It was a normal day that required no change. I was running very lean by looking at the plugs. I ask another racer what jet he is using...

I am fimiliar with a EGT guage in piston powered aircraft. The technique to adjust the mixture was to lean to highest EGT then enrich it. How will I use a EGT in my car for the proper jetting? If you qualify in the morning and race in the afternoon the conditions will change. Is that enough to chang...