Quote:
Originally Posted by djnice
I think this is a good topic because building power efficiently is worth while.
I am interested that the modded cars get better mpg. Are they running leaner? Is it possible the computer is off....have you checked with fill ups?
I know with my duramax when I run a tune it throws the computer off.
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I've found over and over that well built motors just plain run more efficiently. When I first started cylinder head porting I assumed that the motor would need MORE fuel to make up for the added air flow but the reverse is true, after porting (done properly) a motor will run too rich.
In this case, taking away fuel will net more power and better fuel economy.