I have overall seen lower engine coolant temps using precompressor water injection on my VW diesel. I do not have an EGT.
I use a variety of mixes from straight water, to straight methanol. I am running about 14 psi boost without and intercooler, so the difference is VERY noticeable! I see a 4-5 psi boost increase with straight methanol.
The difference is hard to notice on straight water, but under extended periods of boost, the water definitely keeps the temps down. It is even cooler with more power with more methanol in the mix. Some of this is probably due to the intercooling effect the spray has on the intake charge.
As far as suppliers go, check out some of the Biodeisel Forums, Those guys know where to get cheap methanol! sometimes as little as $1 a gallon.
Good luck,
Tony
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92 Ecodiesel Jetta
69 Subaru Sambar electric conversion
75 Chevy Cosworth Vega Turbo
88 Megasquirt Toyota Pickup
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