Automobile Vibration Diagnosis Made Easy

Vibration diagnosis has never been easier!

Click here for a more complete look at our vibration diagnostic routine.

1. Enter the Vehicle's Information

• Enter the vehicle's axle gear ratio, transmission gear ratio, and number of cylinders in the engine. Vibrate will do all the calculations and display a graph representing tire, propshaft and engine vibrations on your screen.

2. Print a Vibration Worksheet

• Graph The Vibration Worksheet graph displays the rotational speeds of the tires, propshaft and the engine.

3. Road Test the Vehicle

• Road test the vehicle at the speed where the vibration is the most noticeable. Record engine RPM and vibration RPM on the worksheet graph. The point on the graph where the engine RPM and the vibration RPM intersect indicates the component group responsible for the unwanted vibration. See the Vibrate Help file for more diagnosis information.

The following readings were taken while road testing on the freeway at a steady speed.

The Engine tachometer equals 2000 RPM

The EVA’s primary vibration frequency (the top row of numbers) equals 1560 RPM while the vibration was occurring.

• Mark the engine RPM and the Vibration RPM on the worksheet as shown below.  The engine RPM and vibration RPM lines intersect on the T2 line.  T2 represents a second order tire speed related vibration.

• On the computer screen.  Move the mouse to the T2 button on the right side of the screen. Vibrate 5.0's "smart images" will be displayed.

4. Next, press the T2 button. Vibrate 5.1's context sensitive Help file is displayed next.

• Click here to access the same help file shown above.  Follow the diagnostic directions to isolate the source of the vibration.

If you have questions or comments send email to support@vibratesoftware.com