dtec DYNertia3 User manual

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DYNertia3 Quick Start (Inertia- Chassis type)
‘Quick Start’ Guide for
Inertia Dyno- ‘Chassis’ Type
(see www.DTEC.net.au for ‘Quick Start’ guides on other dyno types)
‘Quick Start’ Guide: Version IC 8.2 (≥ V3.3.0)
DISCLAIMER: This software and hardware is provided "as is" without warranty of any kind, either express or implied, including, without limitation, any warranty of merchantability and fitness for a
particular purpose. In no event shall the creators of this software be liable for any direct, special, incidental or consequential damages arising out of the use or inability to use the software. The creators
and distributors of this software shall not be liable for any loss, damages or costs, arising out of, but not limited to, lost profits or revenue, loss of use of the software, loss of data or equipment, the costs
of recovering software, data or equipment or claims by third parties, damage to equipment, or other similar costs.
For continuous product improvement and due to ongoing development, we reserve the right to alter specifications without notice.
WARNING: This hardware and software is protected by law and international treaties. Unauthorized reproduction or distribution of Dynertia, or any portion of it, may result in severe civil and criminal
penalties and will be prosecuted to the maximum extent possible under law.
Dynertia software, hardware & firmware is copyright- Darren Todd 2022

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DYNertia3 Quick Start (Inertia- Chassis type)

STOP !!!
Important notice
To be read in conjunction with the main manual!
The following ‘Quick Start’ guide contains basic information for
your Inertia dyno (chassis type)
This is a brief overview of some main operations, it builds the base
that will allow understanding of the features explained in the main
DYNertia3 manual.
Tip- There are sample test Runs installed along with DYNertia3 software so you can learn to use many of the features
without needing to perform actual ‘Runs’.

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DYNertia3 Quick Start (Inertia- Chassis type)
Table of Contents
Concept.............................................................................................................................................................................3
Hardware Mounting & Basic Wiring for Initial Setup ...................................................................................................4
Mounting the DYNertia3 Sensor and Magnet...........................................................................................................4
DYNertia3 Control Unit Mounting..............................................................................................................................5
Basic wiring .................................................................................................................................................................6
‘Linking’ Hardware to PC ................................................................................................................................................7
Two Main DYNertia3 Windows (DYNO / GRAPH) .........................................................................................................8
Basic Hardware Settings.................................................................................................................................................9
First time use, Hardware setup..................................................................................................................................9
Basic Software settings (default).................................................................................................................................10
Quick Test of Dyno Speed Sensor...............................................................................................................................10
Displaying Engine RPM (One Method)........................................................................................................................11
Performing a Basic Inertia Test ‘Run’..........................................................................................................................12
You are now ready to perform a test!......................................................................................................................12
Observing the engine data during a test ................................................................................................................13
Viewing/Loading of Runs (‘Graph’ Window)...............................................................................................................14
Loading test Runs into the Graph Window to view and analyze .........................................................................14
Finding Folders to view or to save tests into.........................................................................................................15
Creating/Deleting new Folders to save tests into..................................................................................................15
Basic Analysis of Saved Data ......................................................................................................................................16
Windows for Further Analysis of Saved Data.............................................................................................................17
Shortcuts........................................................................................................................................................................18
Troubleshooting ................................................................................................................. Error! Bookmark not defined.
Assessing test results- Poor settings.......................................................................... Error! Bookmark not defined.
Assessing test results- Signal issues.......................................................................... Error! Bookmark not defined.

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DYNertia3 Quick Start (Inertia- Chassis type)
Concept
An inertia type dyno operates on the principle of calculating the power required to accelerate a known mass, which is
basically just an additional 'roller/flywheel' driven by the vehicle. The controller senses the velocity of this rotating mass,
handles the precision timing required and outputs this data to the PC for analysis and storage.
The included 'DYNertia3' software package handles all the functions required for dyno control, setting up, saving runs,
correcting for atmospheric conditions, filtering, displaying data, printing, overlaying and analyzing multiple runs.
Hardware Mounting & Basic Wiring for Initial Setup
Mounting the DYNertia Sensor and Magnet
Mount the sensor system to detect the rotation of the roller/shaft.
Note:Do not mount the magnet at the outside diameter of the dyno roller/shaft as the centrifugal forces will be highest;
choose a location towards the centre area. The magnet is also very fragile and must be handled with care!
Note:The included sensor will only detect the ‘South’ Pole of a magnet, so the magnet must be have the South Pole
(marked with red paint) facing the sensor!!
Mounting by screwing/gluing flat to dyno flywheel-
Dyno flywheel is drilled and tapped for 3mm screw (2.5mm drill size is
usual for 3mm tapping). Short (min 6mm) screw inserted into magnet.
Do not over tighten or magnet may crack!
Magnet epoxy glued and screwed to dyno flywheel with South Pole outwards.
The sensor face must be positioned 1.5 - 2mm from the
magnets South Pole (or the head of the screw if one is used
to secure magnet).

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DYNertia3 Quick Start (Inertia- Chassis type)
A16mm diameter hole is required to mount the sensor. Do not over tighten the lock nuts or they will be damaged. A
small ‘blob’ of silicon sealant or similar is applied to the edge of the nuts to stop them loosening with vibration.
Tip- After the ‘Linking’ process (discussed
later) the sensor operation can be checked
via the button “DYNertia3 Sensor Test”. The
indicator and an audible noise can be used
to confirm sensor operation during slow
rotation. The indicator lamp/noise triggers
for a short time as the magnet approaches
the sensor (only on approach).
KEY POINTS- 1.5 –2mm gap. Safe magnet mounting, South Pole (marked with red paint) of magnet facing towards the
sensor!
DYNertia Control Unit Mounting
1) Mount the sensor unit at the furthest distance (‘every inch counts’!) from the engine as possible. Route all cables
as far as possible away from the engine (and any electric motors such as cooling fans) and keep the controller and PC
at a distance. Coil any spare cable up neatly at the PC. Keep the sensors lead away from the USB lead or any other
wiring.
It’s best to route cables inside a protective metal tubing or keep separated from the engine by mounting behind the
earthed metal of the dyno frame or shields. Secure at the DYNertia control unit to prevent movement of the cables.
DYNertia3 software can even be operated by remote control if required (wireless keyboard or a PC ‘page turner’ as one
option), tests can be started and stopped and new files even created (names incremented).
2) Always use resistive Spark plugs and suppressed Spark plug leads to prevent interference (at least during testing).
Tip- A suppressed spark plug lead from a car can be put in series with the existing spark plug to reduce interference.
This additional spark lead is essential on many go-kart engines as they have particularly ‘noisy’ ignition systems!

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DYNertia3 Quick Start (Inertia- Chassis type)
Basic wiring
Dyno only needs the USB and the speed sensor connected for use.
Example of wiring with some additional devices shown
Note:Until correct dyno operation is confirmed and some trial runs have actually been done –
#Do not connect any sensors to input terminals
#Do not connect anything to the “RPM Adapter” input, including the ‘RPM adapter’ (if you have one)
Please refer to the main DYNertia3 Manual (found under ‘Help’ menu) chapter called ‘Inputs- Using’ for full wiring details
on connection of optional data acquisition devices or ‘RPM Adapter’.

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DYNertia3 Quick Start (Inertia- Chassis type)
‘Linking’ Hardware to PC
Do not run other programs when using DYNertia3, background processes could interfere.
1. When you first run DYNertia3 you will be shown this Window. Press the “Continue OFFLINE” button, this is
necessary as DYNertia3 software does not yet know what PC communication port your control units are connected
to, it must be first ‘Linked’.
Once ‘Linked’ DYNertia3 will automatically find the hardware in future when it is connected, powered and the software is
started. If you plug DYNertia hardware into another USB port you may need to re-link.
This Window will also appear whenever DYNertia3 is started and the control units are not connected, powered or
‘Linked’. Pressing the “Continue OFFLINE” button allows you to continue to use DYNertia3 software to view and analyse
data ‘off-line’ (i.e. with no hardware connected to the PC).
2. Plug the USB lead in, start DYNertia3 software, select the menu option “Setup” and then choose “Communication”
and then press the “LINK” button to DYNertia3 to automatically configure the port interface. Then repeat for
‘Weather Watch’ if connected.
With the USB connected to DYNertia the status LED (next to the sensor connector) will blink twice at first to indicate
microprocessor is initialising. After this the LED will illuminate to indicate power.

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DYNertia3 Quick Start (Inertia- Chassis type)
Two Main DYNertia3 Windows (DYNO / GRAPH)
Press the “DYNO” / “GRAPH” button to change between the 2 main Windows of DYNertia3.
The ‘DYNO’Window is used to select and create files, enter the weather details, record vehicle test data, ‘teach’ gear
ratios, view RPM/speed and control the testing.
Note:This Window is only visible when the control unit is connected, powered and ‘Linked’.
Note: The Row of gauges (input channel
data) shown along the bottom of the
screen are visible with a single monitor.
With duel monitors this data is displayed
on the second monitor instead and
replaced with the test ‘comments’ field
(also found in ‘View’ menu).
The ‘GRAPH’Window displays the Power and Torque as traces that can be overlayed and analysed. Traces from a test
Run can be selected, loaded from file and compared.
Note: The ‘Setup’ menus (and most
menus) discussed in the following pages
are only accessible from this GRAPH
screen (they are ‘greyed’ out in DYNO
screen)
Note: The RPM/Speed button makes
the software use either units of RPM or
speed (e.g. kph) for the controls,
displays and graphs.
Note: When test Runs are visible on the
graph we refer to them as ’traces’.
Note: The DYNertia3 Window does not size itself to the PC screen, if you wish you can adjust your PC screen resolution
to best suit (Program Window size is1024 x 768)

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DYNertia3 Quick Start (Inertia- Chassis type)
Basic Hardware Settings
As an example of a basic test ‘Run’ we will test a motorbike, we will do the test in 4th gear and save the results for future
reference.
This example Dyno has roller of 1000mm circumference and an inertia factor of 4.7 kg/m² (your dyno’s inertia value can
be calculated by pressing the ‘MOI” button in Setup/Hardware and adjusted later if required). DYNertia sensor is picking
dyno RPM up from the roller. Leave program settings are in their default position.
First time use, Hardware setup
At the top Left of the Window you will find the menu options. Under the menu option “Setup” you will find “Hardware”.
Ensure ‘INERTIA’ mode is selected.
Select ‘CHASSIS’ dyno type.
Roller Circumference: Enter roller circumference (1000mm in this example) to ensure speeds displayed (kph/mph) are
correct
Inertia Mass: Enter the dyno’s MOI (Moment Of Inertia) inertial value, 4.7 for this example.
As mentioned above, your dyno’s inertia value can be calculated by pressing the ‘MOI” button at the top of the window.
#Leave other settings in their default position as shown, especially DO NOT choose any alternative RPM source.

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DYNertia3 Quick Start (Inertia- Chassis type)
Basic Software settings (default)
Shown below are the software settings (menu choice ‘Setup/Software’), see the main DYNertia3 manual for any details.
Leave the settings at default (except multiple monitor if possible), but take the time to see what options are available–
Note:The option “Multiple Monitor Support” is strongly recommended. Having two monitors allows additional functions.
Inertia Mode Graph Smoothness: When testing on an inertia dyno this filtering value determines the level of
smoothing applied to the data. This has the effect of displaying data that is not so wildly changing due to small cyclic
variations in engine firing and dyno mechanical tolerances.
Quick Test of Dyno Speed Sensor
Before performing testing it is advisable to do a quick function check. Open the main ‘DYNO’ Window and observe the
RPM gauge while vehicle is turning the dyno (at this stage it will show the shaft RPM at the sensor, not engine).
It is often worth a quick look before dyno testing to check for a steady and accurate reading as this will show the RPM
ratio setup is correct and the speed sensor is operating.
At this stage of setup the gauge will just
be displaying dyno shaft RPM, not
engine RPM as no drive ratio has been
specified
It may require you to rescale to observe
the reading. See ‘Note’ below.
The software will not display at very low
RPM, so drive at reasonable speed.
The RPM/Speed button makes the
software use either units of RPM or
speed (e.g. kph).
Note: The scales of the gauges used during actual testing can be altered in the menu option ‘Scales’ (when analysing
existing runs they are automatically scaled).
Note: In inertia dyno mode the ‘Torque’ and ‘Power’ displays do not show data during a test, these are for analysing
data after a test.