Originally Posted by Adger Smith (Post 617724)

When you get tired of reading what all the experts say... Go to the track and tune your engine where it is happy.
Best ET and MPH in the conditions available.
Then hook up your gauge and let it tell you what the A/F ratio is.
Your dealing with arbitrary numbers and your engine combination may not be happy with them.
I loved it when I was dyno testing and had customers tell me the EGT and AF had to be certain numbers to make power.
Their engines usually told them something different.
When making power most engines accelerate when slightly rich at peak Tq and run up toward lean at peak HP.
In the car I like slightly rich at the gear change to produce Tq and pull off the gear.

Originally Posted by Jeff Stout (Post 617758)

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.

Originally Posted by Steve Polhill (Post 617787)

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

Originally Posted by KRatcliff (Post 617795)

This is true to a point, but replacement parts don't always cost a small fortune on engines and turning them on is generally pretty easy.