Personally, I prefer the 8% reading over actual speed as a safety factor, especially considering the number of over zealous LEOs out there. A couple of weeks ago, my brother was stopped in Ohio by a state trooper for driving 52mph in a 50mph zone. I once got a ticket for 27mph in a 25mph zone. My brother simply got a lecture and a "warning" ticket.
Speedometer Appears to Read 5-6 mph Fast
- Thread starter tcrooks
- Start date
One of our members (pdfruth) already did that (gear pos indictor) with a PIC.
iirc he also posted the code to roll your own. I'm guessing an unused D/A pin could be used to drive the speedo.
See'n as it's all in the software you could have it be a battery bug and use the speedo as the voltage read out on start up LOL. You might want to have a cal function as a lot of motorcycles are designed to have an optimistic speedo. Or just read the signal to the speedo do some math and spit out a corrected signal.
fiziks
I brake things.
My speedo is 7.1% over actual. What bugs me more is the odometer is 3.1% over actual, so when my odometer turned 60k last week, it was really only 58,140. So, that means the ECU is counting pulses differently for calculating speed than it counts pulses for distance. And even with the odometer reading more miles than actual, the average mpg is under by at least a mile or two (GPS distance / volume at the pump) or more (tripmeter distance / volume at the pump) every time I put gas in the tank. So each of these three different calculation (distance, speed, avg mpg) uses a different number of pulses to determine distance... The error is by design.
So, for the guys that have gone to the dark side, do the car tires have a larger circumference than bike tires? Has the CT affected the speedo, and if so, in which direction?
So, for the guys that have gone to the dark side, do the car tires have a larger circumference than bike tires? Has the CT affected the speedo, and if so, in which direction?
yeah but we all cant seem to align because our calendars and watches are all off by 2.35% ;-)
LOL.
How do you figure out how many miles you went in a day?
I mean do you use a solar day, civil day, divide up a mean tropical year or just go with a stellar day....
the only good thing is my mpg is a bit better than I thought so,lol
I thought the speedo was fairly accurate,with all the technology the bike has you'd think they'd have got that right
I thought the speedo was fairly accurate,with all the technology the bike has you'd think they'd have got that right
OP
OP
Thank you one and all. I'm a lot smarter, about this. I could ignore it and read my GPS (what I do), I could get a speedo-healer, I could build a speedo-healer, or; I could buy the replacement parts for a police bike. wow!
You know, I prefer having an over-optimistic speedometer, rather than an under-optimistic odometer. It is a trade off. If I set the speedometer so it is 100% accurate with a speedo-healer, the odometer is going to now be under -accurate. So I rather mentally make a note that when my baby shows 110km/h really she's doing 100, and I am already 30 past the usual limit of 80 km/h. The other factor is how the speedometer works. It can't be that accurate as a mechanical hand sweeping an approximate 270? arc driven by electro-magnets... a digital speedo is way more accurate.
fiziks
I brake things.
True, a digital speedo would be more accurate. However, both the odometer and the mpg displays are digital and it is clear that they both are in error by different amounts in different directions. My odometer is 3.1% over actual. So by that measure, my indicated mpg should be about 3.1% over actual mpg when in reality, it averages about 6% under calculated mpg (based on a calculation using an odometer that is off by 3.1%) or 3% under actual (using GPS mileage).
If they can make the police bikes dead on, they should be able to make them all dead on.
If they can make the police bikes dead on, they should be able to make them all dead on.