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DYNertia3 Quick Start (Inertia- Chassis type)
Displaying Engine RPM (One Method)
We are going to test for now without
a direct engine RPM signal (such as from the optional ‘RPM Adapter’).
As we do not have direct measurement of engine RPM we have three options for testing. We could test quickly with just
Speed as the graph X-axis (kp
h instead of RPM), but we will choose another option which we will call ‘option 3’; this
option will assume the bike has its own tacho fitted already.
All other RPM input options are explained in the main
manual!
Option 3- Ratio Teach-
If DYNertia3 knows the drive ratio between the engine and the dyno it can calculate actual
engine RPM from the dyno roller RPM (as measured by the sensor).
Press the ‘Speed to RPM’ button, right hand side on
the main ‘DYNO’ Window to make the Window shown
below visible.
Ride the bike until the bikes tacho matches the ‘Engine Target RPM’ in your test gear (4000 RPM in this example
shown; alter this set point if RPM not suitable for your vehicle) then simply press a ‘Compute Ratio’ button, we will use
“Compute Ratio 4” in this example to remind us we are testing in 4
th
gear. The calculated ratio will now appear in the box
above the button (1.9895 in this example)
Tip-
If you know the RPM at a certain speed you can enter this and DYNertia3 will calculate the drive ratio.
For example if it does 3500RPM at 150kph then enter “3500=150” manually in any of the ‘Target to Engine Ratio’ fields.
Press Enter and your setting will be transferred to the
‘Record Settings’ panel for “Current Ratio” (in the ‘DYNO’ Window).
That’s it! DYNertia3 now knows the engine RPM for any speed driven in the gear just used. You can ‘teach’ other gears
also if you want to do testing in multiple gears. The ratio you want to use for testing can then be selected in the
‘Record
Settings’ panel for “Current Ratio” (in the ‘DYNO’ Window).
