COOLINGMIST CMGS / VC2
The CMGS/VC2 controllers were release in April of 2009 by Coolingmist. These were designed to be simple to use, high performance, cost effective and great looking. Nothing is more simple to use. The beauty of these controllers is that for the novice user you just install and go. It will inject based on boost and display boost. For the user that wants more control, you can program the controller. The best part? No laptop or computer required. Just navigate through the simple menus, make your choices and save the data to firmware. Nothing is easier.
Over the last few months we have had many customers upgrade a progressive controller from other companies to our CMGS and VC2 units. We have had some issues with improper installations. I would like to go over a few points to make clear how to integrate with an existing system.
Pump Installation:
Alot of progressive style controllers on the market have you ground the pump to the Chassis and the controller will then pulse the Positive wire of the pump (the red wire). If you have an existing system that is set up this way (either progressive or non progressive) you will need to re-wire the pump. With our Controller, we give 12 volts to the pump power and pulse the ground. This means you do not ground the pump independently of the controller. This is very important.
Solenoid Installation.
Just as important as the pump issue is the issue of installing a solenoid or checkvalve.
I have attached diagrams showing the CMGS with a solenoid as well as with a checkvalve for everyones reference. The VC2 wires identical.
Solenoid Install
checkvalve install
CONTROLLER STATUS INDICATION:
There are several manners to give you a visual indication of whats going on with your system.
1) Auxillary Input:
CMGS and VC2 have an Auxillary input wire, they also have an AUXILLARY output wire. When the input wire gets a ground signal it will light up the FAULT INPUT. Alot of customers use this input for a low fluid indication. Another thing you can do is have it light up when you reach your MIN/MAX settings. This costs nothing as its included with the kit. connect the 22 gauge green wire to the 22 gauge yellow wire and the fault will light up when you reach your MIN settings.
2) Pressure Switch Input:
If you have our status monitor or any pressure switch that can handle the pressure of our system, you can use this to ground the AUX input wire. this would be better than option #1 because it will tell you there is pressure in the line. you would have an idea whats going on. You will have a difficult time determing correct operation from a clog as pressure can exist with the absense of flow.
3) Flow sensor input.
You can order the CMGS/VC2 flow sensor. Connect the flow sensor red to power, black to ground and white to the CMGS/VC2 white wire. By default each bar on the CMGS/VC2 will represent 100 CC/M making a total of 1000 CC/M. if you are running more than that, you can change the CMGS so each bar equals 200 CC/M. lastly, you can change the 3 digit LED display to display flow instead of boost if you wish.
4) Float switch input.
If you are not going use the fault input to light up when you reach your MIN setting, you can use it to light up when you are low on fluid. Just wire according to the diagram. The 22 gauge green wire connects to one of the float switch wires and the other end of the float switch gets grounded.
BOOST GAUGE:
By default the CMGS is a boost gauge. It will display boost from 1 to 30 PSI in .1 increments. The gauge is very accurate and responds in real time. If you have a 52 MM boost gauge you can replace it with this. If you are attached to your boost gauge, you can program this controller to display dutycycle of the pump or a voltage source.
0-5V INPUT:
The CMGS/VC2 have a 0-5V input. With this you can choose to either inject based on the 0-5V source or inject based on boost or inject based on boost and 0-5V. By default the CMGS displays Boost however you can display the voltage or the multiplied value of the voltage. A video showing how we display voltage and make a multiplier and why you may or may not want to do that is here:
videos
Alot of SRT-4 will take the CMGS and make it inject based on boost and Throttle position. This will keep your computer from registering a rich condition at low throttle.
PROGRESSIVE or FIXED RATE.
For those that want the ultimate performance, you can set the MINIMUM and MAXIMUM values and inject progressively. This means your system will give more flow as your signal (boost usually) increases. This is the normal mode of operation. Some customers that are more old fashion and prefer a fixed rate system can either use a relay and allow the AUX output wire to activate the system OR they can set the MIN and MAX settings to the same and the system will turn on at 100% dutycycle.
CHANGING THE CURVE:
A nice feature is the ability to re-program the MIN and MAX dutycycles. In many cases you dont need to do this, however by changing these you can change the entire curve and lower the entire flow rate. For example, if you set the MIN dutycycle to 10% and the MAX dutycycle to 80% the controller will scale the PWM output from your 10% to the 80% over the MIN boost/MAX boost. This is great for fine tuning.
Setting the MAX dutycycle is to lower the overal flow rate as stated earlier, but the MIN dutycycle has a use as well. By default its set at 25%. Assume you are using a very large nozzle and dont like the atomization on the low end..the higher you set the MIN the more pressure the system will start with. This is never an issue with the 250 PSI pump however with a 150 PSI pump there are times setting the MIN dutycycle makes sense.
FLOW SENSOR CALIBRATION:
If you install the flow sensor at the nozzle as recommended you will not need to calibrate the CMGS. If you install the flow sensor at the pump or at another location you will need calibrate.
You can set the CMGS from 170 to 270 which represents 17,000 pulses per liter to 27,000 pulses per liter. You will have to flow test the unit for a minute and see how many CC are showing up on the screen and then compare to what is in the cup. Make adjustments on the CMGS and try again until you have it where you want it. remember, this only needs to be done if you install the flow sensor away from the inejctor and it only needs done 1 time.
10 second start up delay:
the system will not turn on during the initial 10 seconds of startup. During this time the screen is blank and the fault will flash. This is done for those that decide to inject in 0-5 volt mode. Some vehicles send an initialization voltage signal to maf/tps or other sensors when the car starts up. If we did not have this protection built in, those injecting based on voltage would notice the car would inject briefly at startup. This delay prevents that from happening.
REFERENCES:
see page 4:1-6 for programming options
http://www.coolingmist.com/instructions/cmgs.pdf
see videos of different setups here:
videos
CMGS and VC2 Controller Tips and Tricks
I'm getting antsy now to put the forged bottom end together and really let this turbo eat with the water/methanol injection, but so far that project keeps getting prioritized down the list. . . At least with the water/methanol I can have some fun with the stock motor (and cams) in the mean time.
Linear Mode
