Really get creative and you have to hand it to them.

Was bored today, so I built a CO2 intercooler sprayer... - RX7Club.com

I was looking into other options to lower IAT's without getting a supercooler JUST yet. And of course I had been thinking of CryO2 and/or a N20 Sprayer for the stock H/E...google it and sure enough an RX7 cat beat me to it.

Synopsis of this link:

CryO2 CO2 intercooler evaporation kit = ~$450

Same parts at home depot (with ebay for the gas/fuel solenoid) = ~$80

Effect = Ice on intercooler, but care must be taken not to allow CO2 into your intake.

For this problem I'm considering having all of my "spray" be pointed directly DOWN rather than INTO the H/E. simply because at boost the air behind the h/e...which now has extra CO2 in it...might get sucked into the intake.

I'll let you all know how it goes. Weekend project hooray!

 

THe larger Supercooler will provide cooling at an improved rate forever. The CO2 unit is only 20 ounces in capacity and would have a minimal effect possibly needing replacement after each run. THe cost shown of $450 would be similar with the innercooler, plus all the $20 refills to keep it going.

It does not look like a great deal and there is the problem that CO2 has to be metered so that you dont FREEZE part of the innercooler and block water flow or split the innercooler casing altoghther. Hummmmmmmmm nope not my idea of a workable solutition overall.

The latent heat of vaporization of CO2 provides about 2 - 3 times as much cooling as regular Ice or about 50 ounces of Ice which is little, factoring in the cost and complexity of CO2. I think a CO2 fire extinguisher would be lower cost and a better value if the gasses did not dilute the incoming air to the motor reducing power.


What the heck WEEKEND AGAIN Woody

Universal Industrial Gases, Inc...CO2 Carbon Dioxide Properties, Uses, Applications - Recovery from Industrial Sources - Concentration in Air

 

Not to disagree with woody! A 20oz CO2 bottle will hold enough CO2 for many passes and there are many bottle size options over 20oz. Filling a 20oz CO2 bottle at any paintball support facility will cost about $2. If you have a scuba bottle back up it can be filled for $20 and provide many refills. Very cost effective in my opinion. It would be important for me to mount the bottle so that it released gas and not liquid CO2, mounting of your bottle will differ based on the style of fill tube. With the mix rate of CO2, air flow through the cooler, and the temp of the coolent in the system; I believe there is little chance of icing as long as you are blowing gas. If your intent is to blow liquid CO2, your on your own.

 

I guess I should clarify for woody, I agree 100% that for a consistent solution the Supercooler is the way to go. I would FOR SURE buy a supercooler before the full CryO2 system. I'm thinking this for more of in-between run cooling. Rather than wanting to give my car an hour to cool I could simply give it a spray with some CO2 and run again. If I can put the system together for under $100 it would be worth it in my opinion.

 

Since I already have the supercooler, I say blow CO2 on a supercooler and get the best of both!!

 

This also makes me wonder about the effects of a hand-held CO2 sprayer to cool of the intake tubes between runs at the strip. That would help with heat soak and reduce your cool down times between runs.

 

Hand held CO2 sprayer....aka CO2 Fire extinguisher.

I'm going to TRY to throw together a mockup together in a few hours...see how far i get.

 

CO2 fire extinguisher can also chill a six-pack of beer in about 30 seconds. Very useful tool. Third use is to actually put out a fire. Go figure.

 

What if we ran the CO2 discharge line through the intercooler expansion tank before discharging the gas over the heat exchanger? This would enable twice the cooling opertunities and ensure gassing of the CO2 before spraying. We would likely benifit from running the CO2 flow coils inside the expansion tank in the reverse direction of the flow in the tank, bottom to top to maximize heat transfer. Im going to check around for a dry ice can with installed coils that would work as an expansion tank to see what I can come up with.

I think I have the issue of CO2 ingestion figured out but have to wait three weeks until I get back in front of my car to be certain.

 

I'll chime in. I had a full Cry02 system in the C32 and it was very benifitual.

Paint ball stores will not fill a 20# bottle btw. They are limited to 10# by insurance. Any fire extinguisher place will do it tho for about $10.

I was able to get about a half day of track runs. You don't have to worry about the gas choking the engine if you are moving.

They sell intercooler sprayers which were nothing but a oval with holes poked in to "mist" whatever its attached to.

Better solution is rear mount split system / bigger intercooler.

Best solution is rear mount split system / bigger intercooler and cry02! But not cost effective. I was hot lapping numerous times without effect on IAT.

And yes, we would spray down the engine compartment with no2 all the time, just at a distance. Hot equipment and immediate cold temps dont play well.

 

Keep that stuff far from the intake if your sucking that in its robbing you of power, unless your spraying nitrous then getting a little in the intake wont hurt.