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Old 05-19-2007, 01:35 PM   #1 (permalink)
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Speed sensor pulse rate???

Anyone know what the pulse/mile rate is for HD VSS? I'm adapting an electronic cruise control for my '05 FXST and need this info to set it up properly.

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Old 05-19-2007, 01:50 PM   #2 (permalink)
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springer- is still riding a stock bike springer- is still riding a stock bike
I don't know what it is but you could calculate it to get started and then adjust it for real world later if it is not close enough.

A guess on how to calculate it (having never done so before)

1 Lift rear tire off ground
2 Remove speed sensor from transmission
3 Rotate rear tire until tire valve stem is on bottom to use for reference point
4 Rotate tire one full revolution and count the number of teeth that pass where the speed sensor would have been
5 Measure the circumference of the tire

5280 feet/mile divided by the circumference measurement = tire revolutions/mile

Then tire revolutions/mile multiplied by the number of teeth per tire revolution should equal the approximate number of pulse per mile from the speed sensor.

Sounds complicated but really should only take a few minutes to accomplish.

This is just a guess but it is where I would start if I could not find the information needed.
What do I know, I ride a Shovel

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Old 05-19-2007, 03:02 PM   #3 (permalink)
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Daytona Twin Tec rates the FXSTD VSS at 1382 Hz at 100kpm (60 mph). You can refer to: http://www.daytona-twintec.com/downl...structions.pdf

Page 13 has the table.

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Old 05-19-2007, 06:48 PM   #4 (permalink)
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Thanks Airglider- Assuming the frequency in the table is cycles/second, I figure it's running 84000 pulses/mile. Unfortunately my cruise only has settings up to 38000, so it looks like I'll be using a magnetic pickup instead of the VSS.
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