It won't damage your car. Basically (and correct me if I'm wrong), the cooler temps will allow the turbo to compress air more efficiently (cooler air is less dense) which will give you better spool up time, which will yield more power in earlier rpm ranges (and throughout the entire powerband for that matter). You may however spike a bit, unless you have a good wastegate/bov/boost controller setup.

 

thanks for the information Junon it makes sense to me...ill be testing it out as soon as this damn rain goes away

 

I did the water spray thing before when I had a boosted civic. I went to the junkyard and picked up a windshield washer nozzle and reservoir with pump from an old VW.

 

i would try cryo2 no waste of no2. spray co2 in stead of costly no2 http://www.designengineering.com/

 

kind of. but not really. the IC's are after the turbo. sinced the air is compressed by the turbo, it gets hot. the air goes from the compressor to the IC before going into the engine.

I personally have had my car dyno'ed w/o spray and then with someone directly emptying a bottle onto my FMIC. there was absolutly no difference. UNLESS that run was lower HP for whatever reason and the Nitrous made up for it exactly.

the concept makes sense, but it just didnt work for me.

 

I wouldnt mess with cryo2. Cryo2 uses carbon dioxide as the agent to "cool". The downside to this is that carbon dioxide is also an agent to extinguish fire. CO2 chemically displaces oxygen, which is a known element needed for combustion. If CO2 gets sucked into the intake path, there goes the efficiency of your set-up. Here's a test conducted:

http://www.cryofuzion.com/spraybar.htm

 

I believe cooler air is more dense, allowing more air (with more oxygen) into the cylinder.

 

Correct, which could throw of your tune and cause you to lean out. So whether it will hurt your car and your tune you will not know unless you watch a wideband while you spray the intercooler. I know on my wideband when its 30 degrees or so outside i notice that my wideband reads a bit leaner than it does when its say 50 degrees out. But at the same time its not the same as using a nitrous sprayer b/c im starting with cold air and cooling it more after it goes through the intercooler.

So i would say during warmer weather conditions the sprayer would be helpful, but i would be weary of using it in cold weather.

 

I personally ran the intercooler sprayer kit. I felt huge gains, but it was probally not from the cooler air charge. On most turbo setups, the turbo is placed right behind the intercooler. This may cause the turbo to ingest nitrous when sprayed on the intercooler.
It would be good to see if there is any difference when you use nitrous or
Co2??

 

All this really depends on your setup, such as your charge air flow, intercooler size, intercooler efficiency, intake change temp, and ambient air temp, as well as how much ambient airflow is going through the intercooler and how much water you're spraying (and how well it's atomized). Not an easy thing to predict, except when you're looking at a setup that's virtually identical to yours. Just like anything else, how much power you gain depends on how much power you start with. The same amount (percentage, etc) of efficiency gain is going to relate to a different power increase on a 700 HP engine than on a 200 hP engine.

The short answer is, it will help power. The real answer is much more complicated. It's all about attention to detail and execution. You can't just say "it's good for 25-40 HP" because that says nothing about what setup and conditions that applied to.