CM5-LT - Water Methanol Injection Controller

Torqbyte Inc.

$299.00 USD $449.00 USD

  • Controls 1 or 2 Water Methanol Injection (WMI) pumps in forced induction gasoline or diesel setups 
  • Industry’s first fully-configurable 3D map PWM duty control based on Engine RPM and Boost - not available typical "progressive" controllers
  • 2 General Purpose Outputs can be used for controlling boost control solenoids, anti-siphon solenoids, Fast Acting Valves, auxiliary high-imedance injectors, staged injection solenoids, lamps, relays, LEDs, or 3rd party Electronic Boost Controllers (EBCs)
  • Ideally suited for Direct Injection or staged Water Methanol setups
  • Advanced built-in safety features not available on other rudimentary Water Methanol Injection controllers
  • Fully customizable operation with easy to use TorqTune PC software
  • TorqTune software also provides real-time data viewing, data logging and data playback of all system parameters for unprecedented ease of system tuning
  • Designed, tested and made in Canada

Torqbyte CM5-LT is the most advanced programmable water methanol pump controller on the market. It is capable of simultaneously driving two individually-controllable water methanol injection (WMI) pumps and two individually controllable anti-siphon solenoids, two Fast Acting W/M injection valves, two auxiliary high impedance injectors or any combination thereof. Each of the CM5-LT's two pump outputs is capable of supplying up to 10A to the connected pump.

At the same price point as the S.A.D. progressive controllers marketed by the other water methanol kit suppliers, Torqbyte CM5-LT gives the user ability to independently configure and control one or two WMI pumps and multiple solenoids which makes it ideal for high boost and high horsepower direct-injection applications that require sophisticated staged WMI set-ups. No other controller on the market offers this level of integration and flexibility. 

Water Methanol Control Strategies

VPD: Variable Pump Duty

The usual North American water methanol kit suppliers all utilize a control strategy that adjusts the flow of the injected water methanol mixture by “progressively” varying the speed of the delivery pump in relation to manifold boost pressure or the MAF sensor output.S.A.D. Progressive Control Approach

 These S.A.D. progressive controllers all use manual entry of the start boost/MAF set point and the full boost/MAF switchover. The controller then implements an imaginary straight line between these two points and mindlessly varies the pump duty back and forth along that line. The S.A.D. progressive controllers don’t allow for logging and analysis of the injection system performance. They are as crude and unsophisticated as it gets without using a hobbs switch wired directly to a pump, but are widely used because they require very little effort to operate.

FPD-VSD: Fixed Pump Duty – Variable Solenoid Duty

A European Water methanol kit supplier utilized a completely different control strategy that adjusts the flow of the injected water methanol mixture by varying the duty of a “fast response valve” which is placed upstream of a delivery pump whose duty is held constant, usually at 100%, and whose internal bypass is used to keep the line pressure somewhat constant. This is a much more sophisticated technical approach with a higher overall delivery bandwidth which allows the injection system to react to changes much quicker than the crude S.A.D. progressive controllers. This control approach also lends itself well to modern direct injection set-ups. The placement of the “fast response valve” naturally prevents siphoning which is a problem in modern direct injection set-ups that see the injection nozzles exposed to manifold vacuum.

European WMI Controller

Torqbyte Control Strategy: Up to the User

The S.A.D. progressive controllers can only drive a single delivery pump. They also usually have only a single channel for driving an optional anti-siphon on/off solenoid valve. This makes them somewhat less than optimal for use in direct injection set-ups or staged set-ups that require a lot of stages.
The higher-end European controllers can only drive a single delivery pump and one “fast response valve”. They cannot be configured for multiple stages of delivery, but they are provided with optional direct injection manifolds for 4, 6 and 8 cylinder configurations.

Torqbyte CM5-LT can drive two delivery pumps and two on/off solenoids or two “fast response valves” or one of each solenoid type. With the CM5-LT, the users can implement a VPD control approach based on RPM, boost or another 0-5V signal of their choice. They can also implement the FPD-VSD control strategy that is based on RPM, boost or another 0-5V signal. Because the CM5-LT has two PWM pump outputs and two General Purpose outputs (GPOs) which can either drive On/Off solenoids or PWM “fast response valves”, the user can implement a hybrid VPD/FPD-VSD control strategy or something completely new and unique. The CM5-LT also interfaces directly with the hardware provided by the S.A.D. progressive controller suppliers as well as the European controller suppliers, so upgrading your existing system to use a CM5-LT is simple and straightforward.

One Stage - Intake mounted nozzle


One Stage - Direct Injection / Manifold mounted nozzle with anti-siphon solenoid or Fast Acting Valve (per cylinder nozzle distribution manifold(s) can be added if desired)


Two Stage - Intake mounted nozzles


Two Stage - Direct Injection / Manifold mounted nozzles with anti-siphon solenoids or Fast Acting Valves (per cylinder nozzle distribution manifold(s) can be added if desired)


Three Stage - Intake mounted nozzles


Three Stage - Direct Injection / Manifold mounted nozzles with anti-siphon solenoids or Fast Acting Valves (per cylinder nozzle distribution manifold(s) can be added if desired)


Four Stage - Intake mounted nozzles

TorqTune Software

In spite of its sophistication, CM5-LT is extremely easy to install and configure with our intuitive TorqTune PC software.

TorqTune Table Edit Screen

This free software allows users to fully configure the operation of the Torqbyte CM5-LT. Certain parameters, such as duty cycle maps, can be adjusted with the engine running for real-time tuning. Additionally, TorqTune allows the user to live view many of the unit’s internal parameters, log them to a file and save them for later playback or for sharing with others. These advanced functions allow the user to observe the effects of various configuration changes in order to achieve unprecedented control of their methanol injection and/or fuel pump operation.

TorqTune LiveView Tab

TorqTune software can store your CM5-LT's configuration settings in special TTINI files that you can store on your hard drive or share with other CM5-LT users. Other users' configuration files can be loaded into your CM5-LT and used "as-is" provided your set-up is the same as the other user's or they can be used as a starting point for your own customization. TorqTune software can also log and play back saved log files which can be analyzed in TorqTune or in Excel. These features make the CM5-LT and TorqTune ideal for tuners who need to work on their customers' vehicles remotely.

The feature set provided by Torqbyte CM5-LT and its accompanying TorqTune software is not available with any other water methanol injection or fuel control system.


A Controller that Evolves with your Setup

If you don't need all of the CM5-LT's advanced functionality right away, you can use TorqTune to configure the CM5-LT to operate as a dumb "progressive" controller equipped with two adjustment trim-pots for manually setting the pump activation boost point and the "full pump speed" boost point.

If you own a CM5-LT you won't need to purchase a new controller with additional features as your set-up evolves and your water methanol injection system gets more complex. The CM5-LT will grow with your set-up making it the last water methanol controller you will ever need to buy.

CM5-LT is designed to be future-proof. Its internal unit firmware can be upgraded from your PC so you can continue to take advantage of new features and enhancements as they are rolled out. Simply download the latest firmware from our website and reflash your CM5-LT from the TorqTune software. As always, all firmware and software updates are free for all our customers and our dealers.

If you already have a competitor's water methanol kit installed, but need more flexibility, the CM5-LT can control all the exiting hardware in your water methanol set-up. Simply toss out that "progressive" controller and with a few simple wiring modifications you'll be on your way to being in full control of your water methanol delivery.

CM5-LT block diagram is shown below:

Industry’s First TRUE 3D WMI Pump Duty Mapping

Nearly all other commercially available water methanol injection kits come with crude pump controller electronics packaged inside economy hobby electronics enclosures or gauge pods. These open-loop controllers vary the pump speed based a single parameter – usually boost pressure. They are often called "progressive" controllers presumably because they "progressively" increase the pump's duty relative to boost pressure. However, no consideration is given to air volume or engine load and the user is not provided with any useful means of fine-tuning the linearly-varying water methanol pump speed or customizing the water methanol delivery to account for non-linear engine operation. These limitations result in the same quantity of water methanol mixture being introduced into the cylinders at all engine speeds. This is clearly a less than optimal approach.

In order to establish accurate and predictable water methanol injection, a good estimate of air volume is required. Torqbyte CM5-LT is the only controller on the market that accurately establishes the air volume by calculating pump duty based on two parameters: boost pressure and engine speed. The CM5-LT's water methanol injection delivery is fully digital and is completely customizable by the user through a 16x16 table (i.e. a 256 point map) which is downloaded into the unit.

Other water methanol kit providers state that their pump controllers are "digital", but what do they really mean by that. Sure, some of them come with a basic "digital" display that shows parameters like boost or pump duty, but how truly "digital" is their internal operation? As a true digital controller, the CM5-LT is built around a fast microprocessor that performs 2-dimensional linear interpolation simultaneously in both vertical (boost or voltage) and horizontal (RPM) axes to generate pump duty values which change smoothly and gradually between all adjacent table cells. This is the same algorithm used in today's modern Engine Control Units (ECUs).


Need extra water meth at a certain RPM & boost point, in an otherwise linear map? No problem. 

Need to add a small dip in water meth delivery required at another RPM & boost point? No problem.

The other controllers simply don't provide this level of flexibility, especially not in one unit that can control four outputs each with its own unique configuration table.

Torqbyte CM5-LT is supplied with a 4-Bar MAP sensor, but the TorqTune software allows you to configure the unit to use any 0-5V MAP or gauge pressure sensor of your choice. This is an important if you are using the CM5-LT on something like a high-performance diesel set-up that sees up to or over 100PSI of boost.

If you do not want to base your water methanol injection on RPM and boost, you don’t have to. Pump duty can be based on just RPM or just boost. 

Don't want to base the Water Methanol Injection control on boost pressure? Want to use some other 0-5V sensor or signal? No Problem. Select what you want to use for the vertical axis source

and you're set.

If other exotic or unorthodox water methanol control schemes are required, the CM5-LT's two spare 0-5V analog inputs can replace boost as the vertical axis in each of the tables so you can base the pump duty on another 0-5V signal, such as the MAF or the TPS. You could even base your water methanol delivery on the 0-5V output of an O2 sensor controller or even a simple manual pot. With Torqbyte CM5-LT, you are in full control of your WMI pump operation at all times allowing you to make it fit virtually any vehicle or engine set-up.

The CM5-LT always stores the user-loaded 3D duty maps in its on-board, non-volatile memory. TorqTune software can store these maps in calibration files and allow them to be saved, opened, edited and shared. Pump duty cycle, boost, RPM and a number of other parameters can be logged and played back using the TorqTune software. Users can easily edit and customize the water methanol delivery calibrations for their specific engine configuration.



Low Power Outputs

Besides the two high power pump outputs, Torqbyte CM5-LT also provides you with two low power General Purpose Outputs (GPOs) whose operation is also fully customizable through their own dedicated 256 point map tables that can vary the duty of each GPO based on engine RPM plus another 0-5V parameter such as boost pressure or a spare analog voltage.

The low power GPOs are pull-to-ground type outputs and are capable continuously sinking up to 1A from each attached load. A typical use for the GPOs is controlling staged injection solenoids or an anti-siphon fluid control solenoid which prevents methanol water mixture siphoning in set-ups where the water methanol pump is mounted below the water methanol tank or where the water methanol nozzles are mounted behind the throttle plate and can leak while exposed to engine vacuum. This same solenoid can also be used to restrict fluid flow momentarily before injection allowing the water methanol pump to build line pressure and ensure better atomization of the water methanol mixture when the solenoid opens.

Another popular use for the GPOs is controlling an additional high-impedance injector. This additional injector can provide additional fuel when the user's set-up has outgrown the capabilities of the stock injectors.  In addition to improving the overall fuel delivery, the additional injector can sometimes help alleviate the problems typically seen in direct injection systems, such as carbon buildup.

Other uses for these outputs are activation (or deactivation) of loads such as relays, lamps or LEDs that can be used to control other systems in the vehicle or provide visual indication to the driver based on the 256 point table configuration.

Spare Analog Inputs

Torqbyte CM5-LT comes with two spare 0-5V analog inputs. Either of these spare inputs can be used to control any of the four 256 point tables instead of the default MAP sensor.

Weather the two spare analog inputs are used instead of the MAP sensor to control the duty of one of the outputs or not, both can still be used for live-viewing and/or data logging allowing the user to record and analyze parameters including, intake or exhaust temperature, throttle position (TPS), Mass Air Flow (MAF) reading, water methanol Flow Sensor output or Air/Fuel Ratio (AFR) taken from a Wideband O2 sensor controller.

Spare Logic Inputs

Torqbyte CM5-LT provides the user with two active-low logic inputs. An open circuit on these two inputs is considered inactive. However, connecting either of these inputs to ground, through a switch or a relay, signals an active state to Torqbyte CM5-LT and allows it to take a pre-defined action.

For example, if the user has configured the CM5-LT for boost control, these inputs can be used to select between two boost set-points or put the car in valet mode where the boost is set to the lowest possible (i.e. wastegate spring) boost level.

Many other uses are certainly possible and are only limited by the user’s configuration.

 Built-In Safety Features

Torqbyte CM5-LT actively monitors the current passing through its dual high power pump outputs. The user is able to set the unit’s undercurrent and overcurrent limits using TorqTune software to guard against problems that could be caused by electrical malfunctions or component defects in their fuel or water methanol injection system. For example, if excess current draw is detected that exceeds the user-entered overcurrent limit; it could be an indication of a short circuit in the pump or in the wiring or a blocked line which is causing the pump to overload. On the other hand, if the current draw drops below the user-entered undercurrent limit; it could be an indication of a break in the wiring, an empty tank, or a faulty pump. The CM5-LT can detect and flag these faults to the user or can take action like reducing boost to its lowest setting to protect the engine (only in configurations where the CM5-LT is controlling the boost solenoid). This is a feature not available on any other controller.

An in-depth description of CM5-LT's Safety Features can be found HERE.

 Optional Dash-Mounted Display

In most cases users will use a laptop or a tablet with a USB connection to communicate with the CM5-LT and view, log and modify its various measurements and parameters. For users wishing to view just some of the parameters, Torqbyte CM5-LT provides a low-speed serial communications port for displaying the following:

  • Actual Boost
  • Target Boost (if used)
  • Auxiliary Input Value (if used)
  • Battery Voltage
  • Boost Solenoid Duty (if used)
  • Main Output Duty
  • Auxiliary Output Duty
  • Engine RPM

Torqbyte DM1 display module is available for purchase separately.

Additionally, users can download the free TorqView software from our Support Page, which allows them to view all important unit parameters on a small 7"-9" Windows tablet that can be mounted on the dash.


PM3 Slaving

Each of the CM5-LT's high power outputs can supply the pump with up to 10A of current. If more current is required, it is possible to slave one or two Torqbyte PM3 Pump Amplifiers to get up to 36A of current from each slaved output.



More Info

Operating Temperature -40°C to +60°C
-40°F to +140°F
Dimensions 6.0" x 5.0" x 1.75"
Weight 1 lb
Current Rating (MAIN, AUX) 10.0 A
PWM Frequency (MAIN, AUX) 39.2 kHz
Current Rating (GPO1, GPO2) 1.0 A
PWM Frequency (GPO1, GPO2) 30.0 Hz
Current TorqTune Version: v1.10.0
Current CM5-LT Firmware Version: v1.67

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