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Electronicals / Forscan Expert
Joined: Fri Nov 24th, 2017
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Wow we are collecting some serious cluster tech this is going to look great on the tech articles pages. I don't think I have seen a collection of info like exists in this thread in one single spot on the internet.
Now we need some square wave pulse generating device to pre calibrate speedometers after needle removal. LOL! What's the frequency of 60 MPH?
133.3333Hz
Most Fords are set to 8000 pulses per mile. So 60*8000 Pulses equals 480000 Pulses per hour. Divide by 3600 seconds=133.33Hz
It's 2.2222Hz per MPH.
I used an arduino to generate the 50% duty cycle when I was trying to make a speed correction device. Still seemed a little off. Maybe because the arduino only generates a 5V signal instead of 12V.
Anyway you can generate a speed and check it using forscan. Then you can manipulate the frequency to where you get a solid mph, like 60.
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2000 XLT 2.5L A/T 2WD
Mods:
Power Windows/Locks Mirrors using OEM harness and parts
Explorer Sportrac White Face Cluster
Explorer OHC and Auto-dim Mirror
Auto Door Locks
Full HID Projector Retrofit