Killer Chiller with Stage 1+ JHM S/C

[JimmyBones]

If I had to put thought to it I would be in line with what sakimano said.

The KC unit won’t change the DA and the DA helps with the mass of air that is available for compression at any specific time. A good DA will always be important when it comes to going fast. The lower the DA the more dense the air charge is and more power is available.

With the KC unit the biggest part of the gain is the ability to keep intake temps stable keep temps low close to ambient or even below ambient. The hotter the intake temps there is diminished gains per tempiture heat increment.

Every FI system will sooner or later run into something called heat soak and that’s when the charge system has overwhelmed the cooling system and you have to wait for the cooling system to dissipate all of the heat and get the cooling system back under control With the KC unit you can fend off heat soak indefinitely if you want and you can rebound form high charge temps quickly that is where the gain is form with the KC unit.

Now you can get the intake temps below ambient with the KC unit and that is a big plus as the cooler the charge temps the better the power and efficiency… BUT only to a point. There is a point where the charge temps can keep dropping and you won’t get any more power improvements or the gain of power improvement will be less and less each temp change.

Overall the KC unit lets you have more control of your water to air system. with that said back to the original question. “gains” will really depend on the envirement and outside temps. The higher the outside temps the more beits you will get out of the KC unit. and the more you put the car into a heatsoak condition in any temp the better the results will be from the KC unit due to helping you fend off heatsoak.

So you don’t really make any MORE power but you are able to keep the power you are making longer. and more consistant as the outside temps rise.

Justin has a lot of really good points in this post.

regarding the use of 12A gas, doesnt that damage the compressor? Also isnt it harder to come by?

It is a different refrigerant than normal R12 that was used in older cars. The Industrial 12A refrigerant from autorefrigerants.com is an aftermarket replacement refrigerant that is a hydrocarbon based refrigerant. I had to explain this to someone that wouldn’t listen to me and it frustrated me enough that I had to tell them to leave because saying the same thing to a wall gets really old after two or three times.

Anyways, I ordered and tested the Industrial 12A refrigerant and it does NOT help. The in cabin cooling effect was awesome but the intake air temps didn’t get as cold than as with normal R134A. Normally driving around town with max cooling I see IATs 30 degrees F below ambient with R134A but with Industrial 12A I only saw like IATs 24-26 degrees F below ambient. It was worse with the other cooling settings. When in dual zone mode while using Industrial 12A the compressor duty cycle would go down to really low values because the evaporator outlet temps would get close to freezing so the 08-HVAC module would drop the duty cycle to not freeze over the evaporator.

[JimmyBones]

The other week I did more testing and had some really good results. It was like 60-50 degrees F ambient that night. The intercooler brass fittings completely frosted over from the water getting to between 12-17 degrees F.

https://farm5.staticflickr.com/4474/38055174281_d30f8bb2b8_z.jpg


https://farm5.staticflickr.com/4513/38001780456_dd576f1eb9_z.jpg

If anyone can find a gauge unit that reads below freezing (0 degrees C or 32 degrees F) for IATs then please let me know because my current gauge is very inaccurate below freezing.

https://farm5.staticflickr.com/4487/38001783336_b396b8b7f3_z.jpg

[iconic78]

Good work Jimmy, thanks for all the testing and feedback on the KC system. This provides anyone else going down this route with some real data and results to benchmark against. I am sure the RS is going to be happy with those kind of temp’s. Love the frost on those Brass fittings ;D

Have you fitted yours yet? Did you remove the rad??

[rs4fan]

Good work Jimmy, thanks for all the testing and feedback on the KC system. This provides anyone else going down this route with some real data and results to benchmark against. I am sure the RS is going to be happy with those kind of temp’s. Love the frost on those Brass fittings ;D

Have you fitted yours yet? Did you remove the rad??

Hi James, Nope not yet, in around 2 weeks time, I have received the KC system so ready to go!

[rs4fan]

Thanks for te feedback Jimmy, awesome pic, love the frost ;D ;D. Good to know that it is a functional mod that operates as advertised. Cant wait to get going with mine.

Regarding the temperature gauge, what type is it and how/where did you plummed into the coolant loop? Is it the gauge or the sensor that’s not giving accurate reading?

[JimmyBones]

Thanks for te feedback Jimmy, awesome pic, love the frost ;D ;D. Good to know that it is a functional mod that operates as advertised. Cant wait to get going with mine.

Regarding the temperature gauge, what type is it and how/where did you plummed into the coolant loop? Is it the gauge or the sensor that’s not giving accurate reading?

I have the Zadatech gauge unit. It uses a simple two wire 5V temperature probe that I drilled and tapped a hole into the back side of the intercooler housing for. It is reading intake air temperature after the air is cooled off going past the intercooler. I don’t have a temperature sensor in the intercooler water circuit currently but I could add one later on. Zadatech claims that the gauge only reads from freezing (0 degrees C/32 degrees F) to 150 degrees C/302 degrees F.

[iconic78]

@jimmy so which refrigerant are you now using? 134a or 12a? Do you think it would worthwhile changing the thermostat to one with a lower temp seeing as you now only have the 1 main rad? Im just concerned with the increased loads on the engine that 1 rad isnt enough. The majority of owners would only see high ambient temps only in summer whereas i see them all year round.