Does anyone know what the stock air fuel ratio is for the Magnum engines? I want to get a computer program (B&G) done because I believe that is the only way to set that perameter. The reason being is that when I manipulate how my fuel management reads the boost on my ProCharger I can get 25mpg on the highway. I come across this strictly by accident so I am trying to find the proper way of going about it. I did not have an air fuel ratio meter hooked up at the time so I was unable to see how dangerously low my mixture had been. It could not have been to bad she moved right on down the highway.

 

I beleive that all factory computers are set to try to maintain 14.7:1, Air : Fuel. A quick way to fool your computer to cut down your fuel trim is to install a resistor in place of your intake air sender.