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Originally Posted by Richard L
I have often been asked about compressors wheel wear, is this is myth or probable? You are the one of the long term users of pre-turbo users. However I like to point out that you use a more superior technology by using air-assisted nozzle with super-fine droplets.
Please post some of your experiences on this myth.
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I can honestly say this (some will be surprised), in some applications wheel wear will happen and in others it will be basically no existent. In about 2 out of 10 cases I will get feedback of wheel wear the others say it does not happen or is so small you cant notice it after injection of 100lt or more.
I had one customer/friend who bought a USB bore scope camera and took a video to show the water going into the front of the turbo (in his case he had noticeable wheel wear with my system), it seems to be related on where exactly the unit is placed and also if the compressor housing has a bell mouth like found on GT Garrett turbo's (GT35R and TO4Z for example). I have many other people (in stated ratio) who say its just not so and you cant see any signs of wear at all on the leading edge of the compressor wheel.
My personal recommendation is regardless of system (yours mine someone else) to place the water jet against the flow of air if possible or if its following the path of air or mounted on the out pipe wall to injected it a long way down stream of the compressor wheel and not to mount it on the inner radius of a pipe bend. It is more complex than what it seems and it looks like it can be done the wrong way and mark the turbo compressor.
On the weekend I was at the local drag track and there is a friend of mine who runs a very old school turbo set up with suck through tripple SU carbs (in front of turbo), T04, 36psi boost, methanol fueled, and water injection, the water "jet" is nothing but a nozzel and a solid stream goes in front the middle carb! no compressor wheel wear has ever been seen on this set up *go figure*