CM5 – High Power Pump Controller

R9 386.00

Out of stock

SKU: CM5 Categories: ,


  • Designed for¬†driving one¬†Low Pressure Fuel Pump (LPFP) and one Water Methanol Injection Pump at up to 20A each
  • Industry‚Äôs first 3D mapped control of pump duty based on Engine RPM and Boost
  • Two¬†General Purpose Outputs (GPOs) can be used for¬†controlling optional boost control solenoids, anti-siphon solenoids, lamps, relays, LEDs, or third-party Electronic Boost Controllers (EBCs)
  • Comes¬†with advanced built-in safety features not available on rudimentary Water Methanol¬†Injection¬†controllers
  • Fully customizable operation with¬†our¬†easy to use TorqTune PC software
  • TorqTune software provides real-time data viewing, data logging and data playback of all unit parameters for unprecedented ease of system¬†tuning
  • Designed, tested and made in Canada

Torqbyte CM5 is a highly advanced programmable pump controller capable of simultaneously driving two¬†fuel pumps, two water methanol injection pumps or one of each type. Each of the CM5’s¬†two main outputs is¬†capable of continuously supplying up to 20A of current to each¬†pump allowing it to directly drive the popular aftermarket LPFPs including the¬†Audi TTRS (VAG Part No. 8J0 919 051 E), DeatschWerks DW65v¬†andAermotive 340 Stealth.

CM5 is functionally equivalent to the Torqbyte CM5-LT, but it features higher power output circuitry and a thermally-enhanced, finned, CNC machined enclosure which allows it to output 20A of current per channel compared to the 10A per channel capability of the CM5-LT.

CM5 contains¬†special circuitry which¬†allows it¬†to be directly connected to and accept commands from the factory J538 fuel pump PWM control module. This allows¬†the ECU to maintain¬†full control of the aftermarket LPFP operation and maintain the closed-loop fuel pressure control mechanism¬†that the vehicle was originally designed with.¬†However, most Bosch and Siemens ECUs have a hard internal safety limit of 92% LPFP duty that cannot be exceeded¬†via ECU LPFP re-mapping.¬†This 92% LPFP duty¬†ceiling sometimes prevents the aftermarket LPFPs from supplying the HPFP system with an adequate¬†volume of¬†fuel during periods of high¬†fuel demand. To address¬†this issue,¬†the¬†CM5 can¬†be programmed to follow¬†the factory J538 PWM command up to some¬†user-programmable boost/RPM set point.¬†Above that point, the user can program the CM5 to ignore the factory PWM signal and take over LPFP control,¬†driving the pump¬†with user-entered duty table values that may¬†be¬†set as high as 100%. This¬†can help¬†work around the ECU’s 92% LPFP duty limit¬†and it ensures that the aftermarket LPFP is operated¬†at¬†its maximum rated capacity¬†during periods of peak fuel demand. As soon as the transient peak fuel demand condition passes and the boost/RPM fall¬†below the user-programmable set point, CM5 returns LPFP duty control back to the ECU and the factory J538 PWM control module. Because of this unique and intelligent fuel pump control mechanism, not found in any other controller on the market, CM5¬†is¬†most commonly used in setups where its Main¬†Output controls a Water Methanol Pump and its Auxiliary Output controls an aftermarket LPFP (like the popular Audi TTRS pump VAG Part No. 8J0 919 051 E).

Fuel Pump Control

In the same manner that it controls the water methanol injection pump duty, Torqbyte CM5’s Auxiliary Output 3D duty map can be used to completely customize the operation of an aftermarket low pressure fuel pump (LPFP), giving the user full control of the vehicle’s fueling.

Additionally, Torqbyte CM5 is the only pump controller on the market that includes built-in hardware which senses and emulates the drive signal from the factory fuel pump modulator (e.g. Module J538 in VAG vehicles). This unique feature allows the Torqbyte CM5 to operate in one of three LPFP control modes:

Mode 1 – Duty Table with Pump Priming Delay:¬†This is a full-time pump controller mode in which the factory fuel pump controller J538’s¬†commands are ignored and the pump duty is fully controlled¬†by the user-entered 256 point fuel map that bases fuel pump duty on engine RPM and manifold pressure (or one of the two spare 0-5V inputs). Using TorqTune software, the fuel pump duty can be logged for post¬†analysis and fine-tuning. This mode is ideal for high performance set-ups requiring high volume fuel delivery. Because¬†in this mode the CM5 needs to handle the fuel system priming on ignition, a field is provided where the user can enter a Fuel System Priming Delay which is the amount of time the CM5 will run the fuel pump at 100% duty to prime the fuel system. WARNING: Only use this mode for Fuel Pump Control. Never select¬†this mode if there is a Water Methanol Pump attached¬†the Auxiliary output. Doing so will run the Water Methanol Pump at 100% when the engine is not running which¬†will hydrolock the engine.

Mode 2 РDuty Table with OEM Control: This is a part-time pass-through mode in which the pump duty is controlled by the ECU and the factory fuel pump controller J538 below some boost and RPM set point. Above that set point the CM5 jumps in and takes over applying the user-programmed duty table values to the LPFP.

Mode 3 – OEM Control Pass-through:¬†This is a full-time pass-through mode in which the pump duty follows the factory pump modulator‚Äôs command 100% of¬†the time. Pump duty cycle is controlled¬†by the factory ECU and the factory fuel pump controller¬†J538, but the¬†CM5’s hardware relieves the factory controller from¬†supplying the¬†high current required by the aftermarket LPFP preventing it from overheating.

Mode selection is done by selecting the appropriate setting in the Auxiliary Output control drop down menu in TorqTune software.

Torqbyte CM5’s high current output capability together with the unique factory fuel pump modulator hardware allow it to overcome the challenges of increased fueling in returnless direct-injection systems in which the ECU and the OEM fuel pump modulator perform closed loop control of the fuel system line pressure. In these systems, the factory fuel pump modulator is sized for the factory in-tank low pressure fuel pump. More powerful aftermarket in-tank pumps overload the factory fuel pump modulator and lead to overheating and intermittent operation.

Torqbyte CM5 installs in-line between the fuel pump modulator and the upgraded fuel pump to relieve the factory system from the current supply role. The CM5 is capable of continuously supplying the aftermarket fuel pump with up to 20A of current.

Even configurations that retain the use of a factory fuel pump will still benefit from the CM5’s more efficient output circuitry driving the fuel pump.

PM3 Slaving

Each of the CM5’s high power outputs can supply the pump with up to 20A of current. If more current is required, it is possible to slave¬†one or two Torqbyte PM3 High Power LPFP Drivers to the CM5 to get up to 36A of current from each slaved output.


Additional information

Weight 1 kg