I don't pretend to have any expertise in vehicle engine mechanics but I believe there are better gases than freon useable in cooling systems. Freon is notorious in damages to the environment.

You are on to something the question is can it be designed within the parameters you discuss. If you had an insulated, hollowed out section which acted as a "pre-buffer" where the incoming cool air could be moved around the power increasing device this might be able to act as an isolater. The question is would the standard A/C unit on the vehicle supply enough pressure to cool the vehicle and the turbo. You might look at some of the standard designs of A/C process flow to get a better understanding of how to tackle this. I wonder if there might be a way to develop a small airconditioner "booster" that could take the cold air coming from the AC and super cool it before sending it on to the turbo. The AC booster might be the way to go. It could take the cold air already coming off the unit, make it cooler and send it on.

About the freon comment above. Yes the "original" freon is bad for the environment, but the newer systems R134a refrigerant is much better for the environment.

The term freon is used to generally when referring to the whole gamut of refrigerants. Kinda like "Kleenex" because Freon really is just a trademark from DuPont for their CFC refrigerant.

Great idea, haven't seen any prototypes for the idea...yet. For a roots style supercharger, a heat exchanger is mounted underneath the supercharger. Instead of running water through the heat exchanger for cooling, run refrigerent through the heat exchanger. One could also have a dial in cab with a post heat exchanger gauge and throttle the temp desired.

If you're up for it, build the system on paper and do the calculations to prove your theory. Here's a link to a page with the necessary functions and some good explanations of heat exchanger theory; Intercooler Theory Article. To be honest though, there's a reason most street cars use air-to-air intercoolers, the first one being cost, the second one being that they're the best for all-around performance, since the motive power for cooling is provided by the vehicle's forward velocity (ramming outside air through the intercooler fins) instead of an engine driven pump. Still, it's worth a try :)

For any of you still reading these, I have made and am producing these for auto and truck use. They seem to work quite well. As a matter of fact this is what they do do

This will give off a: 1. colder air mixture for better thermal and volumetric efficiency. 2. Colder running engine for summer time use in this hot climate. 3. Better fuel efficiency (better gas mileage) 4. no or less detonation problems 5. cleaner running, more efficient combustion. 6. Increased power gains of 20-30% on turbo charged and a 5-10% on naturally aspirated units. 7. Can run your AC all the time and not have to worry about overheating.8. Requires no storage of volatile gases and can be used all year long.9. Humid weather would make vehicles perform better. 10. Longer life of the drive train at cooler temps.11. Longer lasting lubricants in the drive train between changes.12. Lower emissions from the induction of cold moist air.

and if anyone is interested in investing or selling please do e-mail me.