Data Logging

Owned by Nils Bluhm
Last updated: Aug 22, 2024
7 min read

MHD features comprehensive logging / monitoring abilities.  It can be used to keep a close eye on the condition of your vehicle, the quality of the tune being used, and much more.  MHD includes a vast list of loggable parameters, and the list is constantly expanding as we add more valuable parameters for helping calibrate the perfect tunes.

After connecting to your vehicle, you can access the data logging screen by selecting the tab Mon > Data Logging.

 

 

 

 

You are able to constantly monitor up to 8 “live gauges” on your device while data logging many many more to a CSV file saved on your device.  By default, you have manual control over data logging to file start/stop.  If you do not want to manually start / stop the logging and would rather it start automatically, tick the checkbox for “Enable Automatic Logging.”  In this mode, the data logging to file is automatically started once the accelerator pedal is pressed past a user defined threshold.  This percentage is set on the Monitor Options screen, detailed in its section below.

After tapping the Data Logging button, you will see a screen like this.  There will be anywhere from 1-8 gauges present, depending on how many you configured in Monitor Options.  You will either see the start button if using manual logging, or the Ready button if you ticked the box to enable automatic logging.  This simply indicates auto logging mode is active and ready for recording to file one your pedal threshold is met.

 

Gauge Interaction

There are a few ways to interact with the individual gauges while the monitoring screen is displayed.  Currently you can change the gauge parameter and also reset the displayed minimum / maximum.  The setting to show or hide the gauge minimum / maximum is configurable on the Monitor Options screen.

Changing Gauge Parameter

To change the parameter that is being displayed by a gauge, simply tap once on the gauge itself.  You will see a popup like this.  Simply tap the new parameter you would like the gauge to display.  If you decide not to change the parameter, press Close instead.

NOTE:  If when selecting a new parameter you receive an alert that the maximum number of parameters has been reached, you must go to the Monitor Options screen and deselect a few from the parameter checkbox list that you do not need.

Reset Min/Max Display

If you would like to reset the displayed min/max that has been recorded while the gauge has been active, you can simply swipe up or down on the gauge face itself.

Changing Gauge Style / Appearance

This functionality is coming soon!  Please check back for a future update

 

 

 

Monitor Options

Before you can view and edit the Monitor Options screen, you must either be currently connected to your vehicle, or have connected to it at least once before.  You can access the Monitor Options screen by selecting the tab Mon > Options.  Once the screen loads, you will notice the top section titled Configure Options.  This is an expand/collapse area.  Tap it once to expand, and you can tap it again (on the Configure Options header text) to close.  When expanded, you can scroll through more options within that area.  Once expanded, you can configure the following options:

  • Gauge units: changes the units used for the values displayed on the gauges

  • Gauges layout: changes the numbered of gauges shown when monitoring

  • Logging units: changes the units used for the values recorded to CSV data logs

  • Shift light RPM: the RPM at which the screen will flash white, indicating 

  • Gauge peak hold time: a timer for how long the “triangle” pointer on the sport style gauges will remain at the peak value

  • Min pedal for alerts: accel pedal position threshold that must be exceeded for gauge alerts to be active

  • Play alert beep: will play an audible beep when a gauge alert threshold is exceeded (in addition to gauge turning red)

Show overall min/max: will show the persistent min/max of a gauge parameter in the lower corners of the gauge

 

 

Below the Configure Options section are two buttons which apply to the parameter list at the bottom of the screen.  They will reset the list to its default selections, or deselect all parameters.  You can also select or deselect parameters manually, up to an engine-specific maximum.

  1. To set up a gauge alert for a specific parameter, << swipe left on the name of the parameter in the Monitor Options param list.  This can be seen here on the Boost parameter.

  1. You will then see a popup like this appear.  Enter the values you wish to be your min and max for alerts, then press OK.  If you press Remove, the alert for this parameter will be removed and both fields set back to 0 (no alert).

    1. If you do not want an alert on the Min (boost, for example), enter a very low value.  

    2. If you do not want an alert on the Max (rail pressure, for example), enter a very high value.

 

  1. In this example, we entered for Boost:  -50 Min and 30 Max.  This will prevent an alert when in decel and Boost param is reading vacuum, but it will give an alert when Boost exceeds 30 (psi in this case, units depend on your configured Gauge Units from above).

 

 

 

Graph a Log

To graph a log you have previously saved, select the tab Mon > Graph a Log.  You will then see a file select screen similar to this.  This file select screen defaults to the MHD DataLogging folder, which is where the CSV log files are saved.

Tapping on a log file will bring you to the graph view of your log.  On this screen, you can view the graph in either portrait or landscape view.

 

You can also show or hide additional parameters by toggling the checkbox next to the parameter name.  Finally, you can scroll up and down, pan side to side, and zoom in on the graph itself.  Panning the graph side to side will update the values on the parameter list with their value at that given point in time!

CSV File Actions

On the log file select screen, you can also << swipe left on any log file (*.csv file extension), and will be presented with some additional file options.  From left to right, they are Rename, Share, and Delete.  

Each option is detailed below.

 

Rename: if you select the Pencil icon to rename your log file, you will see a popup in which you can change the file name to something easier to remember, or add details about something specific you noticed while taking the log.

Share: if you select the Share icon, you will see a popup asking what sharing method to use.  For log files, the options are Email, SpoolStreet, and DataZap.  If Email is selected, this will open up your device’s preferred email app with the tune file automatically attached.  SpoolStreet is detailed in its own section below.  DataZap direct upload is coming soon (as soon as they have it available for us).

Delete: if you select the Trash Can icon, you will see a popup confirming if you would like to delete the log file.  Be careful, as this will permanently delete it from your device!

Share to SpoolStreet

After selecting the SpoolStreet option in the Share dialog above, you will be presented with this popup.  If you are a member of the SpoolStreet forum or wish to sign up (visit https://www.spoolstreet.com ), you can get your own API key (lookup using the FIND button).

 

Leaving the API Key field blank will still allow you to upload the log as a guest, but the log will not be guaranteed to be hosted forever.  If you would like permanent storage of your logs, you should sign up and enter your user specific API Key into the textbox.

Clicking OK will begin to upload the log.  Once the upload is complete, you will see the following success message in the popup.  You can click the link to open your device’s browser and view your log on the website, or you can press Copy Link to copy it to your device’s clipboard for later use.