Racepak O2 sensor

[Steve Polhill]

Originally Posted by Jeff Stout

Totally agree. When I started data logging I was rich at gear change. Didn't know any better and went to work on making entire pass stay between 12 and 13to1. As I did the car was slower at 60 to 330 and also at 330 to 660 incrementials. Plugs looked good. Went back with around 10.5 area at bottom rpm of gear change and car came back around. Lesson learned.

Sometimes it needs a little more fuel to help it recover on the gear change. And often there is no reason at all for what it wants. Engines are like women. They want what they want. LOL