My mechanical preturbo water injection

dudemaaan · \r\n \r\n \r\n 10-07-2009, 04:46 PM\r\n \r\n \r\n

I did a writeup about 9 months ago on the "other" forum, I've decided to include the information over here to hopefully get more exposure/interaction on this site. Here are the main points I was looking for when I first decided to add the water injection. So taken from my first post on 12-15-08....

"1) The system design I'm using is mechanical and should have a lower chance of failing
2) Water is free/easily attainable
3) My car is mainly a street car and I'm just looking for a bit more boost with the added reliability of AUX injection
4) I'm cheap and like to do things myself"

When I first decided to add the water I was at 15psi on a t61, my plan was to run 200-300cc of water @ 18 psi or so. I'm now running a t70 @ 23 psi daily and about 600cc of water. All on 93 premium pump fuel.

The system uses no pumps, controllers or other electronics. The only electrical components are a solenoid, and a boost switch similar to a hobbs. It works by using boost pressure from the turbo to pressurize a sealed water tank, this forces the water through the line to the atomizing water nozzle. The nozzle has both a water and an air port to atomize the water very finely. The air port receives boost pressure from the turbo. Located before the atomizing nozzle is a solenoid which is activated at a preset boost pressure by the hobbs style switch. The water is fed directly into the turbo inlet.

The key is to have the water fully atomized before it enters the engine. This prevents any compressor blade erosion from occurring. The benefits to preturbo injection, beyond the benefits of aux injection in general are.

1)Water is better atomized, allowing easier combustion & faster heat absorption
2)Lower Intake temperatures
3)It shifts the compressor map giving the turbo more efficiency at high boost levels. (much like the turbo is physically larger)

My system has gone through a few alterations in the past 9 or so months, and I'll try to cover each of the phases in different posts to keep it somewhat separate. The next post will go into details of the parts used, along with some pictures. Stay tuned.

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