Tech Talk - Smart Ratio |
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(603) 226-DYNO |
Read
about using DYNO-MAX 2000's Smart Ratio it quickly enter the correct overall
gear ratio for simplified chassis dyno setup.
"Reprinted from the DYNOmite
Summer - 2002 Newsletter article."
Dyno Tech Talk is a compilation or copyrighted material, however, relevant web sites and forums are welcome to link to the Dyno Tech Talk index page.
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How do I calculate what Gear Ratio to enter? Here is a something that can make life easier when testing on the chassis dynamometer. Perhaps you have already been mathematically calculating the overall gear ratio between the engine and the rollers (or absorber shaft). Or maybe you have tried to work this ratio out by trial and error while comparing DYNO-MAX’s Engine RPM with the vehicle’s tachometer. Smart Ratio - makes it easy to display Engine RPM (by automatically entering the correct “Gear Ratio” for you) when you don’t have a Yellow Tach lead signal. For example: If you’re only capturing the dynamometer’s roller speed via Shaft Magnet. To use it, first go into “Tools - Preferences - Console” and activate “Set Smart Ratio (“=”) Key tachometer match point as: 3000 RPM.” Next, while running a vehicle on the rollers, shift to the fixed transmission gear you want to test in. Accelerate on the rollers until the vehicle’s tachometer indicates a steady 3,000-RPM. Now, press your PC’s [ = ] key and notice it updates the Run Information Gear Ratio so that DYNO-MAX’s tachometer also indicates 3,000 RPM. Note: You can modify the default match point (in Preferences) to any RPM.
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