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Theory Of Testing
Volume 2, 9/10/04
Section 8 - Page 17
A time interval in seconds for the duration of the test is also requested. The time interval for these
tests must exceed that which it takes to complete a basic inertia test in the same speed range.
Otherwise, the eddy current absorber is turned off during the test, resulting in an inertia style test.
Once all parameters have been entered, the operator is prompted to PROCEED. The operator
should select the gear for the test and accelerate the vehicle to the starting MPH. The eddy current
absorber will engage and hold the vehicle. The operator should maintain wide open throttle and
press the ACCEL selection on the handheld to begin the acceleration test.
The vehicle will accelerate at a constant rate toward the upper test speed. At the end of the test,
the eddy current absorber is engaged to return the vehicle to the starting MPH speed. Another
identical test can then be performed by pressing the “NEW RUN” selection, or the test may be
stopped by pressing the “STOP” selection. When the “STOP” selection is pressed, the eddy
current absorber will engage to bring the vehicle speed to 0 MPH. If you do not wish to return the
vehicle speed to 0 MPH, simply press the big red hand (reset) function on the handheld to end the
test.
8.7.3 Step Tests
Step tests are only available on eddy current equipped dynamometers.
The step test uses the eddy current absorber to hold the vehicle at a constant speed for a desired
length of time and then samples one data point. This test should be run in a single gear and may
be run at any throttle setting.
Power is calculated from the power absorbed by the eddy current absorber strain gage during the
test. Dyno parasitic values are also added to the wheel power calculation, as in the inertia style
tests.
This test is similar to the type used on engine dynamometers. The engine is allowed to stabilize at
each speed point before collecting data. This test is the most accurate for tuning the engine,
especially when observing air/fuel ratio, temperature, and pressure data.
Power numbers for this type test may differ slightly from those observed under inertia or controlled
acceleration conditions. However, these numbers are perhaps the most accurate representation of
the actual power at a specific engine speed under fully loaded conditions.
These tests record data automatically and is saved at the end of each test run to a SFD file on the
computer disk drive. All tests are generally performed at wide open throttle, but may be performed
at any fixed throttle position.
8.7.3.1 Steptest.tpf
This Step test prompts the operator for an initial test speed in MPH at which the data acquisition
system will begin recording data. An ending speed in MPH is then requested and is used by the
test profile to terminate recording of data.