Merits of water in a mainly methanol mixture?.

[keithmac]

I found my car to be "octane limited" to want for a better description on 97 ron petrol. Running 1l/min of methanol when on boost (and 250cc/min water) allowed me to add 6 degrees of ignition timing, which I had to take out before (at 20 psi manifold pressure).

I`ve since switched over to E85 as my main fuel, this has better octane rating than 97ron petrol and I now don`t need the meth/water at all (for the same conditions).

I had limited results with water only, much better with 75%methanol 25%water.