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#1
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Building and electronic speedometer adj?
Folks,
I recently built a "DIY code reader" using schematics from folks on this site. It was fun and works great. Now I'm wondering how hard it would be to build an electronic speedometer adjuster. I know that these are currently available for sale for those whose guage is off due to diff or tire changes. My understanding is that an electronic pulse is sent along a wire to the speedometer. It is this signal that needs to be modified. Any thoughts?
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Willy '94 E420 White Mods ------- Berg Werks Keyless Entry Buzzer replaced with Chime Dash Light Upgrade Burlwood/Leather shift knob Alpine CDA-9815 Head Unit 2002/2003 16" C Class 7-Spoke Wheels Updated "Chip" to fix Code 19 problem |
#2
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bump
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Willy '94 E420 White Mods ------- Berg Werks Keyless Entry Buzzer replaced with Chime Dash Light Upgrade Burlwood/Leather shift knob Alpine CDA-9815 Head Unit 2002/2003 16" C Class 7-Spoke Wheels Updated "Chip" to fix Code 19 problem |
#3
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Like you say they are available.
The pulses are a DC square wave, with "X" being the number of pulses that makes 60mph. Intercepting this signal and electronically altering it to X-yX where y is a constant should be simple enough to do electronically.
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Steve Brotherton Continental Imports Gainesville FL Bosch Master, ASE Master, L1 33 years MB technician |
#4
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You could set it with a GPS , a friend checked both my SD and SE with his and both speedo's were right on.It is a nice thing to know in areas know for speed traps........
William Rogers....... |
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