devilsown water/methanol injection for a diesel engine
I ran a devilsownonline.com kit for a while on my PSD 7. 3 and loved it. With lots of mods, chips stacked, EGTs almost never crossed 1,100 with a BHAF and stock exhaust. The advertisements of lowering EGTs 200-300 degrees are true. I plan to install it on my 12 valve once i find a boost reference.
It is very adjustable but requires a bit of tuning, depending on ambient temperatures, to correctly lower the onset. It will "put out the flame" so you must dial it back for drivability in low RPMs to avoid detonation. On hot summer days i could have the dual nozzles inject full power around 10-12 psi. It is a very nice seat of the pants boost in power, makes the truck move. Especially when towing, you really notice it pulling a big load.
I can set mine so it will kick in as low as 1. 5 psi of turbo boost. It regulates very well. I used 99 cent windshield washer fluid, and just straight water when warm enough. Straight water will freeze close to 32 fahrenheit and not flow. Power actually felt better with straight H2O in warm weather.
Fuel economy did not increase for me. That may be because my chips were already maxing my timing. One of the most noticeable benefits of being able to have it start around 2 psi is that it almost completely cleans up tailpipe smoke! If i ever saw black, i knew that i had run out and needed to refill the tank. If i ever saw smoke at all with water, it would be a grayish colored smoke and clean up immediately.
If you run biodiesel, SVO, or WVO, the only downfall is that NOx is increased. Water/methanol injection is supposed to reduce that greenhouse emission. I have not tested this, but i can testify to an amazingly cleaner burn out the tailpipe.
Perhaps propane will net more mpg but i don't think it will burn much cleaner. Propane would probably make more power but from what i hear, propane can raise EGTs and increase pollutants. I wasn't crazy about having to search for propane, mess with DOT tanks, or having propane under my seat. Water is free and non-flammable, though methanol obviously is. Definitely less expensive. The kit can also be used on gas engines like it was on fighter planes in its early days. I very much like water/methanol injection, one of my favorite mods.
-Also, my pump failed after a little over a year. They said only 3 or 4 had ever failed. They sent me a new pump immediately, no questions asked.