Me and Zinx just finished installing the Vari-Cool system on his car, and before finishing we decided to hook air pressure to it from a regulator and visually inspect how this thing reacts to boost. I hooked it to the output of my air tank and slowly turned up the regulator starting from 0. As you would increase boost the pump would kick on and the more boost it would see the faster the pump would run. It was very easy to tune, especially when you can look at the nozzles. As far as I can tell this unit performs exactly as it should. It reacts in less than 1/2 second from off to full on. I saw no problems with pulsing other than at low boost levels. At low boost levels the water was not well atomized, which could probably be minimized with tuning, but other than that if worked great. We sat there and played with it for about 20 min. Pretty cool unit.

 

Ryan,

I appreciate you post. We worked very hard designing this unit. As you can guess it was designed to improve the variable controller by making it programmable and user configurable, hence more tune-able.

The only real comment I have at this time is your low boost atomization issue. I would guess you have more than 1 large nozzle? I say this because we have tested extensively with a nozzle as big as 18 GPH and that nozzle will always atomize beautiful. My guess and my experience says you probably have multiple large nozzles?

having said that, one of the things I recommend is to adjust the minimum pressure in the software. Right now its set at 25. That 25 is the minimum dutycycle of the pump. I recommend that you move it to 40%. When you do that you will see a major low boost atomization change.

 

Yes we have booth nozzles installed. I am not sure what sizes they are, but we were guessing 12 and 8? Zinx's car is a bridgeported T-88 shooting for 22-24lbs, so I knew we would need lots of juice. Could you tell us how you change the min pressure %?

 

The two nozzles are a M14 and M5, which elates to roughly 22 GPH. Im suprised you are using both nozzles as I feel the single large should be able to flow enough for you. Eitherway thats your choice

Goto http://coolingmist.com/software/varicool_install.zip and install the software on your Windows 2000, XP, 2003 or NT system.

You will need a RS232 to USB converter. Obviously you need .NET framework 1.1 installed on your PC, its free at microsoft.com. if you dont have it on your pc the software will tell you.

Once you install the software there is a document that will tell you how to adjust the MIN. Its as simple as going into config mode and setting the min pressure duty cycle pct.

David