Water Injection

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03-01-2003, 09:31 PM

#31

Tom93R1

Senior Member

Join Date: Nov 2002

Location: PHX

Posts: 265

Quote:

Originally Posted by ryan' date='Feb 26 2003, 11:14 AM

Tom -

How long have you been running your homemade system? Did you base it off of the DSM design on that site? Anything you needed to change to adapt to the 7? What boost level do you have the water injection coming on at? Did you run the pressure sensor off/near your MAP sensor? What did you use for a reservoir and where did you mount it?

I have been running my water injection for about 6 months in its current form. It started out as a Spearco setup and never really worked well. The stock pump is weak and you must run intake pressure to the tank to pressurize it, I never got it to work properly when set up that way. Now I have the pump and solenoid that are listed on the turbomirage.com site and am running that with the spearco tank and pressure sensor. In this pic you can see the tank on the right (where the battery used to be), the pressure sensor attached to it, the pump and the solenoid just to the left of the pump.

I run a 50/50 mixture of distilled water and denatured alcohol. I dont remember the flow rate of the nozzle I used but my tank holds about a gallon and lasts 3-4 gas fill-ups with normal to slightly agressive driving. The pressure sensor is set somewhere around 5 psi but I need to wire a light bulb to it so I can verify when it is coming on. I put a "t" in the silicon hose to my boost gauge and ran that into the pressure switch.

After getting everything working I found I have a leak where the elbow and throttle body meet, water bubbles up through the o-ring. I didnt install it thinking it would be an intake leak detector

Installation is very easy, the instructions on that page apply to any boosted car you would want to install it on. Nothing special, just need to find a place to fit everything.

06-16-2003, 02:10 PM

#32

Orochinoyamato

Senior Member

Join Date: May 2003

Location: Frederick, MD

Posts: 114

Found a site saying this about water/alcohol injection and reliability:

Quote:

GM did implement alcohol injection on a few durability test engines run on a dyno. During the durability tests the engines were cycled between the peak torque RPM and the peak horsepower RPM for the equivalent of 100,000 miles. Afterwards they were tore down and examined. They noted significantly more cylinder bore wear in the alcohol/water injected engines. It was believed to be from unburnt alcohol and water washing the oil off the cylinder walls but they could have also been running higher boost levels. This wear problem was only found on engines run through the durability dyno test and not on any other tests.

(www.geocities.com/rad87gn/tech/alcohol.html)

Would that be better with a rotary engine, since it has a constant oil supply, worse, or a negligable worry either way?