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The Harm it does:
1. Doesn't actually cool the air flowing over the IC, in fact, it will most likely just generate more heat as the water turns to steam once it hits the hot IC and or engine which will generate a burst of hot steam to make things even hotter.
2. Rear tires (Hoosiers in my case) don't react well to water dripping on them and probably wasn't too good for anyone who might be following.
The water spray ultimately just heats up the IC and can cause the engine to start to detonate -- this has happened to my OLD 04 STi and to a friend's 03 WRX until we both removed the water spray and the detonation went away. Spraying with more water doesn't help either, I went thru 3 gallons per track session on my STi and it didn't help heat soak at all -- my lap times didn't change much with or without water spray.
When you go into a Sauna and want to generate some heat, what do ya do, you take a cup of water next to the heater and dump it on the hot rocks which in turn generates a ton of steam with heats up the Sauna more. This is exactly what you are doing if you just spray water on a hot IC and/or Engine.
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"For me, it is far better to grasp the Universe as it really is than to persist in delusion, however satisfying and reassuring." - Carl Sagan
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