Uprev Tune

Chris@FsP · 01-10-2010, 12:45 AM

Quote:

Originally Posted by G37Sam

The numbers I gave were out of my azz just for the sake of demonstration, but yes, the best gas mileage will be achieved when the engine is operating at it's maximum Thermal Efficiency, regardless of whether you had to go richer or leaner.

I disagree. The best gas mileage occurs when the least amount of fuel necessary for healthy combustion is injected into the cylinders

That's why we shoot for mixtures of 14.7:1 for idle/cruise (if the cams permit this lean of an idle), and sometimes even leaner if we're really trying to go for maximum fuel economy under cruise conditions.

G37Sam · 01-13-2010, 06:23 PM

Quote:

Originally Posted by FailsafePerf

I disagree. The best gas mileage occurs when the least amount of fuel necessary for healthy combustion is injected into the cylinders

That's why we shoot for mixtures of 14.7:1 for idle/cruise (if the cams permit this lean of an idle), and sometimes even leaner if we're really trying to go for maximum fuel economy under cruise conditions.

What is it you mean by healthy combustion? Sure you can get a healthy combustion, but that won't necessarily be your optimum or most efficient point. Theoretically speaking, it is only at that efficient point that you get the most HP out of Fuel burned or in other words, the least amount of fuel required to achieve a certain HP which is what you're looking at to keep you cruising at the highest MPG