co2 intercooler spray

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The intercooler on the KB setup is mounted under the blower and is not accessible for such spraying. What's mounted in front of the radiator is a heat exchanger for the A/W intercooler system.

I think a W/M injection would be a more effective means to cool the charge:

http://www.kennebell.net/accessories/waycool/waycool.htm

Of course if you plan to put "juice" to it you'll get a chemical intercooling effect from that too...
 
what is it just a cooler for the antifreeze

See my post above. It's a heat exchanger for removing heat from the coolant used in the air-to-water intercooler under the blower.

In effect, this heat exchanger is one degree removed from the actual intercooler. Your efforts to additionally cool the liquid in it will be somewhat beneficial but probably not greatly so. It's thermally far removed from the intercooler so any additional cooling will take a while to get back to it. As well, the glycol mixture has a fairly significant thermal mass so you'd need to sustain cooling across the entire heat exchanger for a while to make a real difference.

Where would you source the CO2? How would you switch it on and off? How would you distribute it to the heat exchanger without it all just blowing away (if the car's in motion) before it has a chance to actually pull any heat out?

Perhaps a larger heat exchanger would be better... Or a a liquid spray (like a w/m mix) onto the exchanger...