The Vari-Cool Controller is the controller in which all others will judged.  This controller has set the standard for all others to be judged. The Vari-Cool Controller has a MIN, MAX and TUNE Knob. The Min is your starting point. You can set this between 1 and 29 inches of Mercury (vacuum). The Max is your Full Pressure Point, the Tune is your curve. If you set the Min to 20, the max to 6 and the tune to 1, you will get a linear curve from 20" to max at 6" of vacuum. If you adjust the Tune higher, you will get a more aggressive tune. The controller comes with 10 pre-programmed maps, as seen on one of the charts below.  This is the first and only methanol injection controller to have a fully programmable progressive controller. You can hook the unit to your laptop or PC (requires battery power source) and change the parameters. You can make your own maps.  For example, you can make position 1 for street driving, 2 for track, 3 for when you are on high boost, etc.  The controller is completely plug and play right out of the box.  Use of the software to customize your injection is not required, since the controller comes preloaded with 10 different maps. 

Our controller is so dynamic that just about any car can run with the same size nozzle, regardless of the HP. So if you start with a 300 HP car and run our controller, if you end up with 600 HP you will be able to use the same nozzle!  All it will require is to change the knob to a higher position or program your new maps to spray more methanol/water.

This controller has a 1/8" vacuum port that you can simply attach a vacuum source.   


Remember our controller has a CPU and is 100% digital. The accuracy rate and flexibility of this unit is astounding.

The Vari-Cool Controller is a revolutionary in terms of what a water/methanol injection controller is thought of.  Say good bye to pre-programmed controllers that give you no options for tuning, and only have a straight line of increased injection.  Our controller is fully configurable via the Vari-Cool software. This software program allows you to program the unit to your specs with your laptop.  For those of you that do not want to use your computer, the system comes pre-programmed with a base map and has 10 different curves you can choose from. Unlike the other controllers that have a built in linear algorithm, we give you a choice of 10.  This makes the Vari-Cool the controller of choice for tuners and for individuals that want the absolute best controller.

The controller is literally plug and play.  Installation instructions can be downloaded here.  Our controller is available for sale by itself and will work with any 12V pump, we also sell controller based kits.

Software can be downloaded here.  Warning: This software will not function unless the controller is connected to the serial port. The Vari-Cool controller has many advantages.

1)   The casing is heavy duty aluminum, approximately 3/16" thick.

2)   Minimum and maximum knobs are easily adjustable and color coded.

3)    The vacuum sensor is more accurate than competitors models that translate the output from the vehicles map sensor.

4)  Our controller has a 10 position knob that has 10 pre-programmed algorithms for spraying the water/methanol These range from a linear output to an aggressive output. The higher the number the more aggressive the flow. Because of this feature your vehicle can gain more HP and you don't have to worry about changing the nozzle size. Competitors models that do not have that ability are hard coded. That means when you hook the unit up, they give you a pre-programmed algorithm that is likely some what linear in nature. You have no ability to tune with it.

5)  #4 is a great feature and while we are one of the only companies that have that feature. But we took it a step further, with our software you can change the values to make the flow what ever you want.  You may want to make the overall flow from 1-10 more aggressive or less aggressive. Its your controller, tune it the way you want!  Many features of the controller are programmable and screenshots will be below.  It is not necessary to ever use the software. The software exists for those that want to tune for it. The system is plug and play out of the box and has 10 maps already programmed that will satisfy 99.9% of the vehicles. Software requires windows 2000, XP, 2003 and .NET framework (free from Microsoft).


Examples of the water/methanol curve and how you can change it:

Screenshots of the configuration utility:

This is the screen where you can read the data that is being sent to it:  

This screen below is where you can update the settings. It will show you a graph of the how your output will change:

The picture below is where you can datalog. It will show you the PSI, 0-5, pressure, etc. It has a time stamp also. This can be exported for excel or in CSV format:

Controller Specifications:

-  16 Bit High Speed Digital Signal Processor (DSP) Control that operates at approximately 0.5ms.
-  A tunable linear control algorithm updates the Motor control output 2000 updates/second.
-  16 Bit Motor current control resolution provides finely tuned output adjustments of 0.001% of the maximum Motor current draw.

General Specifications:

-  10 position tuning switch limits maximum pump pressure to prevent intake engine bogging down.
-  Boost pressure operating ranges 0 – 30 PSI, 0-100 PSI or 0-30” Hg vacuum (depending on model #) with an integrated Pressure sensor.
-  Variable Min and Max boost pressure settings with large knobs and resolution of 0.01 PSI over the boost pressure operating range.
-  12 bit resolution reading on boost pressure (0.01 PSI resolution over boost pressure operating range).
-  A single green status LED simplifies operating status determination.
-  High speed RS232 serial communications port operating at 115200 baud to allow data logging, analysis and custom configuration/calibration of the unit using Vari-Cool PC software.
-  Vari-Cool software provides precise adjustment and configuration of Vari-Cool operating parameters.

Physical Specifications:

-  Operating temperature range of 0 - 85°C (32 - 185°F)
-  10/32 Male threaded pressure input port accepts 10/32 Female to barbed tubing connection that can be easily sized to accommodate various tubing sizes.
-  Heavy gauge all aluminum enclosure construction with black powder coat paint for long lasting finish durability.
-  Enclosure mounting tabs provide ease of mounting in any location.
-  Durable label is smudge proof, chemical and petroleum products resistant and does not deteriorate over time.

Electrical Specifications:

-  Operates on wide input voltage range 7 – 26 VDC
-  Up to 30Amps DC to the pump across the operating voltage range (using proper wiring and fuse).
-  Unit itself draws less than 50mA with the Motor control output turned off. This means that if the car is not running, this unit can run off the battery alone for a very long time.
-  0 – 5VDC Auxiliary Input with transient voltage protection and 12 bit resolution (0.01 V resolution) can be used with any 0-5VDC sensor to control the Motor Output level or monitored (via serial port).
-  External automotive style fuse protection that can easily be sized to accommodate various motor sizes.
-  Can be wired directly to the electrical system for always on operation or wired through an Automotive Relay connected to the ignition switch for ignition switch operation.

Vari-Cool Software Specifications:

Software talks to the Vari-Cool unit using a serial port that will work with any compatible PC running Windows 2000, Windows XP, Windows 2003, Windows ME, Windows 98, or Windows NT.

Vari-Cool operates in 2 modes. Run mode and configuration mode. In run mode, you monitor data collected by the Vari-Cool unit. In configuration mode, you can set tuning and calibration parameters.

Serial Port:

Vari-Cool serial port has the following settings:

-  Baud Rate 115200 baud
-  Data Bits 8 bits
-  Stop Bits 1 bit
-  Parity None
-  Flow Control None

The Vari-Cool serial port connector is a standard 9 Pin Female DSUB style connector. The Vari-Cool is configured as Data Communications Equipment (DCE device). The connector pin out is as follows:

DSUB:

-  2 TX – Transmit Data
-  3 RX – Receive Data
-  5 GND
* Other pins are not connected and have no function

Run Mode (Status LED Fast Flash):

The Run Mode is the default operating mode of the Vari-Cool controller. While in the Run Mode the Vari-Cool controller continuously runs the motor control processing loop. This loop reads the inputs and adjusts the motor control output accordingly. In the Run Mode a Status Message can be requested or setup to be sent automatically on a configurable Timer period.

The following data values are monitored, logged, and charted with the software:

-  Operation mode (0=Run Mode, 1=Configuration Mode)
-  Boost Pressure Reading (PSI or “Hg, whichever applies)
-  Output to Motor (%)
-  Minimum Pressure Setting (PSI or “Hg)
-  Maximum Pressure Setting (PSI or “Hg)
-  Tune Switch Setting (1 - 10)
-  Auxiliary Input Switch Setting
-  Controller Status

Configuration Mode (Status LED Slow Flash):

The Configuration Mode of the Vari-Cool controller provides an operating mode in which Configuration Parameters can be read and written.

The following parameters are able to be modified:

-  Minimum Motor Output (%) – This is minimum output at which the pump is able to operate and spray water. This value defaults to the requirements of the pumps we supply. If you use a different pump, you may need to modify this value.
-  Maximum Motor Output (%) – This is the maximum output at which the pump should ever operate. This value defaults to the requirements of the pumps we supply. If you use a different pump, you may need to modify this value.
-  Minimum Pressure (PSI or “Hg) – This is the minimum calibrated range of the pressure sensor supplied with the Vari-Cool unit.
-  Maximum Pressure (PSI or “Hg) – This is the maximum calibrated range of the pressure sensor supplied with the Vari-Cool unit.
-  Tuning Parameter – This is a parameter that will change the shape of the output curve to the pump. This can be used to account for any non linear effects of your vehicle, pump, etc. By default, the unit will be calibrated; however you may wish to work with this curve to obtain even better results.

*NOTE*:  The serial cable is not included.

When selecting the injector(s), select the maximum amount you want to inject.  If you purchase the Dual Nozzle Upgrade, both the injectors together should total the maximum amount you want to inject.