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Old 08-19-2019, 10:59 PM   #34 (permalink)
Cyborg ECU
California98Civic's Avatar
Join Date: Mar 2011
Location: Coastal Southern California
Posts: 5,297

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 59.78 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
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Originally Posted by hat_man View Post
Just out of curiosity with so many new vehicles having computer control and digital dashes, if the odometer is mis calibrated wouldn't the speedometer be off also? Wouldn't it use the distance traveled to calculate speed?

If the ECU can be adjusted for tire size, could you "trick" the odometer by adjusting the tire size to compensate for the delta?
Yes. I think that's true. In fact, even on older cars like mine you can get aftermarket devices to spoof the speed sensor signal. For me, it is just cheper and easier to know how off it is and calculate the adjustment.

See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.

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