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Math check

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R Horn

(@r-horn)

Posts: 6

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My YourDyno kit should be arriving this week~~ 🙂

Dynojet 250i, Just checking some quick math, my roller has a diameter of 17.838 inches so circumference 56.04 inches or 4.67 ft.

That should give me a Roller RPM:

Roller RPM 400 @ 21 mph (Your dyno 30T trigger wheel frequency 200hz)

Roller RPM 3600 @ 191 mph. (Your dyno 30T trigger wheel frequency 1800hz)

Seeing the YourDyno instructions state 200 pulse per second as a minimum it would seem I am fitting right into the sweet spot

Thanks

Rich

Posted : 16/09/2025 11:07 pm

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