Quote:
Originally Posted by blownoiler
Water injection is mostly used on gasoline engines, it allows them to run a higher compression ratio and/or more ignition advance without incurring detonation. It could be used on a diesel engine for economy gains in theory, by allowing more injection advance without the attendant high pressure/temperature spikes, but setting up such a system would require a retune which costs dollars. The addition of methanol/water injection to a diesel can give a boost in power, but the methanol/distilled water costs money so dollar economy goes down mostly.
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This is not strictly true. You do not need a retune if you add water injection. You can do a pre-spray of a very small nozzle, I recommend 1gph (max 2 gph). then a 3-4gph nozzle after the intercooler. this will bring your intake temps and exhaust temps down (exhaust temps being the most important for a diesel). If you get a progressive kit - Devils own have the cheapest. then you will be able to set the spray progressively. I recommend 8-10psi start and full on max boost. If you add 10% methanol then I have read you will find economy gains (the VW boys love the water injection). This is caused by the water mixing with the hydroscopic methanol and becoming a cooling agent AND a fuel. Methanol also helps complete the diesel burn process.
Please see my post for up coming results:
http://ecomodder.com/forum/showthrea...ing-30238.html