Performance Trends Inc
Producing Quality Computer Tools for Racers and Engine Builders since 1986
For Eddy Current, Hydraulic, and Water Brake style absorber dynos.
We offer controllers for most any type of absorber (brake) dyno, electric Eddy Current dynos, dynos with hydraulic pumps for a brake, or water brake dynos. The dynos can be chassis dynos for testing the engine in the vehicle, or engine only dynos for testing the engine only out of the vehicle.
Eddy Current Dyno Control System
Standard 120 VAC System
Optional 240 VAC System
Some users have put 2 Power Control Units in parallel to provide more amps. We are still investigating the reliability of this method.
Eddy Current Controller with 2 Power Modules (to handle more power absorption)
Water Brake Dyno Control System part# DT4-WBC (DT4-TC throttle controller is same system without Water Valve and bracket)
Graph showing good repeatability from prototype water brake controller
The Eddy Current controllers get their feedback from RPM, which means the controller is
controlling RPM, not power absorption level. If you do not change the
Manual Control knob, but increase power by opening the throttle, the RPM will
stay constant. Also, as you dial the knob up or down, the RPM will
increase or decrease as controlled by the knob. (There is
also a manual power level mode, which controls amps to dyno with knob, and does
not use RPM feedback.)
The Water Brake or Hydraulic Pump controllers (which control the opening of a valve) use valve position as the feedback, not RPM. Although RPM feedback would be better, it can also go unstable and produce severe oscillation in the valve and then load and RPM at the engine. So what we offer now is the more conservative position feedback. That is what produced the RPM graphs above which shows very good and repeatable ramping up of RPM during the tests.
The typical power test procedure consists of:
If at any time during the test (when the controller is ramping the engine RPM), you manually move the control knob, control returns to the manual control knob. This allows the user to override the automatic control should you sense something is not going correctly during the test.
The current Water Brake Controller is not controlling to RPM, but to water valve opening. When you start your test, the valve opens at a constant, repeatable rate. This works well for engines which have fairly stable (no big "holes" in the) torque curves. We're still developing the RPM feedback method, and controllers you purchase now can be retrofitted, probably by just reflashing the PID controller board and updating the PC software.
Latest version of the software lets you do an accelerating test, and now a decelerating test (starting at a high RPM and pulling the engine down to a low RPM).
What You Need:
DataMite III USB or DataMite 4 USB dyno data logger.
What You Get:
Controller systems as pictured above.
to go to our Dyno DataMite downloading page to download a FREE Dyno DataMite Demo.
Call 248-473-9230. Visa or Mastercard accepted.sitemap