[Diy_efi] Water metanol turbo assist

[Derek]

> Fact is, when you are running heavy WI (read LOTS of H2O, _NOT_ "heavy H2O"
> !!),  you don't NEED to run nearly so rich at WOT as youu do without the
> H2O  !! The water is now doing the internal cooling, and the fuel for the
> same purpose is no longer needed. 13.8 to 14.2 : 1 is PLENTY rich when
> using serious, properly done WI !! This much rich is enough to allow
> selective burning of the hydrogen in the petrol (and thus to take advantage
> of hydrogen's higher heat of combustion compared to adding the second
> oxygen to the carbon).

I was told on this list not too long ago that extra fuel past stoich did more
than just add cooling to the process.

You saying that's all it provides? That the best AFR is stoich under all
conditions, IF the air charge is well cooled for whatever reason below the
temperature where detonation becomes a problem?

If so, then why are methanol fueled race cars used at a 5:1 AFR, rather than the
stoich 6.45:1? Methanol at stoich cools many times better than gasoline at 12:1.


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