M-Logger by M-Engineering

M-Logger by M-Engineering is a stand alone program which allows end users who have purchased a calibration via M-Engineering or one of their dealers, the ability to datalog engine parameters, enable/disable Dyno Mode, and clear faults in all modules.

Quick Links

System Requirements

  • Windows 10

Install Instructions

  • When initially purchasing your calibration from M-Engineering you will have the option to purchase our additional datalogger and diagnostic tool called the M-Logger.

  • If you proceeded with adding the logger option a member of M-Engineering will contact you via email with a Google Drive link specifically tailored for you. This link will have logging profiles, the M-Logger program, drivers for the datalogging cable, as well as a personalized datalogs folder where you can share any datalogs you’d wish for us to take a look at. If you don’t recieve an email within 2 business days of your purchase please feel free to reach out to us. Info@M-Engineering.us


  • Once you have the download link from drive for your personalized folder you can now download the .zip file that lives there. .zip files are compressed files which will require unzipping after downloading




  • Download the .zip file

  • Unzip the files that live within by right clicking on the file and selecting “extract all”

  • Extract all files to your desired folder location. Note: These files should be in their own folder. Don’t extract to the downloads folder where other files exist.

  • This will create a new folder with the extracted files.

  • Run the drivers program to add the openport drivers to your PC. This will allow the logging cable to connect to your PC.

  • Next open the M-Logger.exe

    • The first time you open M-Logger.exe you may encounter a message asking if you’d like to run the program. If you do not see an option to run the program, select “more info” and then “run anyway”

  • Once M-Logger opens you will see the following

  • In the profile section in the bottom you will see a blank box with a drop down arrow. Here you can select the logging profile you wish to view. Most loggers come with a “General” logging profile which can be used to log vital engine data. For first timers select the General Profile.

  • If you have suggestions for monitors you wish to see please let us know! Much of our development is driven from customer requests!

  • Once the profile is selected parameters will now populate and you are almost ready to log!

  • With the supplied logging cable you are now ready to plug in and start logging. You will notice that the action buttons are grayed out. This will change when we plug the logger in.

  • Locate the vehicles OBDII port. It is located under the driver’s side dash just to the left of the steering column on left hand drive vehicles. With the vehicle running, plug the logger cable in and connect the other end to the USB port on your laptop. You should notice now that the action buttons are now available!

Action Buttons

  • Each M-Logger is licensed to one vehicle. One M-Logger may not be used on another vehicle unless you have that vehicles logging profile.

Start Monitoring

  • This will begin the live data feed you can view. It will also start a datalog in the background which will save all the data from your current session. Each log is time stamped at the moment the log was started to help with sorting if many logs are taken.

  • Two files are created for each datalog. .csv files are open and can be easily reviewed in Excel or your favorite log viewer program like MegaLogViewer. The .ldat files are encrypted files which contain proprietary information for advanced analytics such as load limits, boost limits, etc… If supplying logs for us to review please include the .ldat file.

Dyno Mode

All McLarens need to be put into Dyno Mode to allow for a repeatable and accurate torque and power figure. Even AWD Dynos with the dyno rollers mechanically linked, such as the MD-AWD-500 or DJ 424x Linx, require Dyno Mode for proper operation.

  • Enable 2WD will enable dyno mode for dynos that only have one roller or choose to dyno in RWD (RWD is often easier and safer than operating in 4WD).

  • Enable 4WD will enable dyno mode for dynos that operate two sets of rollers at once that are mechanically linked to spin the front tires with power supplied by the rear tires.

  • Disable will disable dyno mode and return the vehicle to normal operating conditions.

  • Dyno Mode Conditions

    • The following conditions must be met to enable Dyno Mode:

      • Ignition on

      • Engine on

      • Handling mode must be set to Normal

      • Vehicle Must be strapped down to Chassis Dyno

      • Parking Brake Released (If Dyno mode is activated with the parking brake engaged you will not be able to disengage the parking brake. You will need to disable dyno mode to disengage the brake, then re-enable Dyno Mode)

Under no circumstances is Dyno Mode to be used when not on a chassis dyno! All stability control features are disabled whilst the vehicle is in dyno mode. The parking brake is also disabled so the car can roll freely. To re-enable all factory features and the parking brake please disengage Dyno Mode.

  • Video Enabling Dyno Mode



  • Video Disabling Dyno Mode


  • Notes

    • It is common for ESC Fault to appear on the dash while in Dyno Mode. When engaging dyno mode the Brake, Parking Brake, and ESC lights will come on and stay on as long as Dyno Mode is engaged.

    • If running the car in RWD verify that you see a change in speed on the dash when rolling the car at slow speeds. If the speed does not change from 0 dyno mode is not engaged.

    • The MP4-12C, 650s, & 675LT will require Dyno Mode to be engaged every key cycle. The 720s, 600LT, 570s, etc… will allow Dyno Mode to persist during key cycles.

    • If the wrong mode is chosen (e.g. Enable 2WD while on a 4WD dyno) the vehicle can through faults which can not be cleared immediately. The faults will need to be cleared and then the vehicle will need to go to sleep for them to fully clear. To put the vehicle to sleep close all open hatches and doors and lock the car. Remove the key from the area for roughly 15-20 minutes.

    • The 650s and MP4-12C do not have seperate Dyno Modes for 2WD and 4WD dynos. Both commands appear in the logger but they set the same mode.

Clear Faults

This action button clears faults in the following modules:

  • ECU - Engine Control Unit (Often referred to as the DME)

  • TCU - Transmission Control Unit

  • ESC - Electronic Stability Control

  • SRS - Safety Restraint System (Particularly useful for clearing an occasional errant airbag fault)



Occasionally you may encounter a connection issue with the M-Logger. Usually a quick disconnect and reconnect of the USB cable to the laptop fixes most issues. If the connection issues persist unplug the dongle from the OBDII port and close and reopen the M-Logger program. If the problem still persists please mark down the connection fault code supplied with the error and contact Info@M-Engineering.com with details of your issue. The Logger will only connect to a vehicle that is running or has the ignition on with the engine off.