Dyno Test #4: Changes Yield Big Results

Charlie mans the controls during EVSR #01's 4th dyno test

Charlie mans the controls during EVSR #01’s 4th dyno test

Our January 28th dyno test was a spectacular success reinforcing our changes from the past tests and seeing significant improvement in the 2 areas where we were having the most difficulties.

Since our last test, we engineered and machined new drive flanges and used an entirely new flex coupler between our motor and differential. This resulted in smoother power transfer with no wear or degradation of the components that were experienced with the first coupler.
Cooling was also improved significantly and track testing is all that is left to prove that the problem is solved. After a lengthy discussion with the motor manufacturer it was concluded that the motor was running at a rotational speed too slow for optimal performance. This resulted in two problems. The first issue was that the internal fan was not working at peak performance and unable to provide enough airflow for sufficient cooling. The second problem was that by running the motor at too low an RPM, increased torque loads were caused, resulting in unnecessary heat being generated to produce the same power.

Charlie reads the voltage and calls out data to Andrew and Chris

Charlie reads the voltage and calls out data to Andrew and Chris

To enable the car to change from 4500 RMP at 100 MPH to 6000 RPM at the same speed, the gear ratio was changed from a 2.93 to a 3.91. With an increased red line all the way up to 8000 RPM the car, was run all the way to 135 MPH on the dyno. We also experienced faster acceleration and less load at a steady speed.

Before our final dyno run in a couple of weeks, Entropy Racing will be building a more rigid sub-frame for the motor and differential to handle the torque loads and give the car a slightly lower center of gravity. Actual track testing is anticipated late in February or early in March. Keep checking back for updates and progress.

Final checks at the end of the testing show EVSR exceeds everyone's expectations

Final checks at the end of the testing show EVSR exceeds everyone’s expectations