Performance Trends, Inc.

Producing Quality Computer Tools for Racers and Engine Builders since 1986

Re: Performance Trends Newsletter (updates)

To: Visitors to Performance Trends Website

Subject: Product News/Updates, March 2015  

  1. Our Shock Dyno vs Roehrig tm Dyno Comparison
  2. Water Brake Dyno Controller Graphs
  3. Last February's Newsletter

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1)  Our Shock Dyno vs Roehrig tm Dyno Comparison  We recently had a customer ask if our Shock Dyno produced accurate results.  They were using another "name brand" motorized shock dyno which has been on the market many years.  They said their dyno's results "did not look anything close" to results from a Roehrig tm dyno.  Many people consider the Roehrig tm to be the industry standard, partially because it is very expensive.

So we sent a couple of shocks to be tested on a Roehrig tm 3VS dyno, and then tested them on our dyno.  The results are almost identical, as shown in the 2 graphs below.  When you consider our Shock Dyno starts at $3999 and the Roehrig tm 3VS costing over $12,500, you can see the Performance Trends dyno is by far the best "bang for the buck".    

Performance Trends Dyno - Penske shock tested at 102 deg  (produced with v1.1B Plus software)

Performance-Trends-Penske.gif (25068 bytes) (click image to enlarge)

Roehrig tm Dyno - Penske shock tested at 80 deg

Roehrig-Penske.gif (36658 bytes) (click image to enlarge)

  to visit our Shock Dyno page for more details and more comparison graphs.


2)  Water Brake Dyno Controller Graphs  We have several eddy current and a few water brake controllers in the field, and continue to refine their operation.  

For water brake dynos, we've added some graphs to our website showing how the controller can produce repeatable acceleration rates.  We currently are just opening (or closing) the valve at a controlled rate, and are not using RPM feedback.  RPM feedback is part of the package, but it requires refinement on every different installation or it can become unstable (RPM oscillation).

Click on the image below to see the RPM acceleration rate is very consistent for 5 different tests using a constant valve opening rate.

RPM Graph from Water Brake Controller.gif (63136 bytes)  (click image to enlarge)

for more info on our Dynamometer Controllers


3) Last February's Newsletter Here are the topics covered in our previous newsletter.  If you would like another copy of February 2015's newsletter (or any previous newsletter) for detail on these topics, visit our website at: Performance Trends Newsletters 

  1. "On Engine" Valve Spring Checker Released
  2. Narrow Universal Flat Follower for Cam Test Stand
  3. Fuel Economy Calculator Enhancements
  4. Last January's Newsletter