With my old setup I had auxilary injectors and meth injection for cooling and a fuel source. I know meth/water shouldn't be used a fuel source. I now have great fuel delivery w/o auxilary injectors. My meth can now be used as a cooling agent only and not as an additional fuel source.

I know my engine and hp output is totally different than most others. How much meth/water does it take to cool the intake charge (as a general rule of thumb)? Should I see a/f reduction? Should I see 1 point richer, 1/2 point? .1 or .2 richer? Should I see 0 reduction in a/f and just an EGT reduction?

 

On some of the mustang boards they use straight water to cool the air temps and don't use I/C to reduce weight. If you don't need meth for fuel use water it cools much better. The meth does add octane though.