Since the air temperature sensor is placed after the water spray, the cooling effect from the additional methanol will make the ECU think the air is much colder than this it. I would tend to re-position the sensor before the jet and perhaps you will notice a difference.
By working through one thing at a time, we can then have more consistant results. I think repositioning the ait temp/MAP sensor is the next thing to alter before anything else such as the MAF.
We normally aim for a lambda valve of 0.86 or 12.5:1 afr. Some engine can run lean and some reich, we shall see on your car. At prresent ypor afr is about 11.3 (0.78L) according to courtenays.
RECAP:
We have reduce the jet size form 0.5 to 0.4mm and added 25% methanol to water.
CONCLUSION:
The engine seemed to run flat and lifeless, it could be the extra cooling effect of methanol at lower air tamperature range as the methanol freezes at -90 degC and boil at 70 degC.
A BMW increased the methanol concentration from 25% to 50% and experience misfire - could be the reason for loss of performance.
Richard
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