[parmas]

Originally Posted by rotrex

I mean with this than unless you inject large amounts of methanol, especially pre turbo like you, IATs won't drop that much. Most of the knock suppression happens due to the water droplets in the cylinder and the high octane of the methanol.

To put the information right... during mixture trials with 100% water vs water/meth @ different percentages, best maximum ignition advance = best knock suppressor was found to be when injecting 100% water. Also IAT was found somewhere in the similar ranges.

The small improvement in IAT with Water/Meth mixed was due to the theory that with meth you can go above 100% Relative humidity. The advantage of using water only was also that after closing throttle, IAT continued to cool for more time although not injecting vs water/meth since meth dissolves earlier than water

In order to reach the same ignition advance I used a mixture of Water/Meth 60/40 with 44% being W.I and 56% being pump fuel. Almost running 20% methanol burn...

Your system is a bit special, indeed and shows significant drops in IAT. But you also have no change cooler. Your system is optimised to both drop IAT and get mix into the cylinder.

if you inject way less past a charge cooler, not to much IAT drop will happen. Most knock suppression is due to in cylinder effects.

Why using a charge cooler then..... if you have water injection ?

Your install is also a good example what you can achieve with WI given you inject enough. 500ml/min for a 430HP engine in the OP' car is not what I consider a lot.

Cheers

:-)

I am looking forward to some warmer weather to properly test the new bigger direct port nozzles.

Good to hear you car is still running strong.

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