Speedo Issue

[Troll]

The speedo is driven by electrical pulses from a VSS mounted in the top of the bevel drive gear housing. The number of teeth on the output gear determines the number of pulses. Since the ratio of teeth to pulses doesn't change, bike to bike, I would say they are all going to be about the same.

[nhtrikes]

Mounted my GPS and an MPH App on phone. Ran both in my car to make sure they were accurate. Both GPS and phone app read exactly the same and both were within 1 to 2 mph different from my wifes's Honda CRV speedo. Pretty darn accurate.  Mounted GPS on bike and took her for a ride yesterday. Not as far off as I first thought.  Only about 8% deviation.  If my speedo is reading 60 I'm really doing about 55. Very little difference above that so on highway at 70 really doing 65 etc.  Obviously less at lower speeds.  I originally thought it was about a 10 mph difference at higher speeds. I usually ride 5 to 10 mph over speed limit and seemed to be the slowest thing on the road. I guess they are just crazy here in the East.

One good thing came out of all this.  I have a '06 Wrangler I tool around in and it has oversized tires. I found out that just changing the tires to a 10.5X31 had the opposite effect. When speedo reads 30 i'm really doing 35. When my speedo is reading 65 i'm doing 72. I'm surprised I haven't gotten a ticket yet.  Also my odo reads .1/mile less for each mile driven. Learn something new everyday! Are all Drifter or bike electronic speedp's like this?? How about cars?

[Gooseberrie]

Have you checked your tires Pete?
With new tires it could be you're in the 10 percent slower range that was normal ten years ago. Newer vehicles go only 5 percent slower as being called normal deviation.

This is done to all vehicles in order to never go faster then actually presented to the rider. I am still surprised manufacturers could bring it down that far. The deviation is only allowed to be a higher reading. Without speed limitations this would mean a 5 percent wrong reading is only 2,5 percent slower or faster on average. Wow!

One other thought is: when you change your reading to be correct, one will still be riding along with traffic and many older cars amongst them, who's drivers think different.

GPS will present the right reading. Bends and slopes still arguable. I have used its warning signal to know where the comfort zone was on certain roads. Chimes meant I went a little faster. More chimes had hit the target. Can't hear it on this bike. Because I have to shift into highest gear, just right there, I know how fast I ride in town and residential area's.

This all may not be the point here. Nevertheless who thinks there is something wrong with a speedometer reading really missed it. Greetings. Alfred

[nhtrikes]

Thanks guys! I was going to ask what a speedo healer was, great link. I am still looking into my options for correcting the speedo but sounds like the speedo healer is the best solution. Thank you again!

Pete,

[chief]

There are a couple of sources listed in the Accessories area of References - page two.

http://www.vulcandrifterriders.com/forum/index.php?action=links;cat=12;start=20

[Troll]

I have a speedohealer. I put it on in 2012, and I'm quite happy with the results. Once I figured out the correction factor, I can now rely on my speedo. Simple installation. I calibrated it so the accrued mileage is correct, and I now know that the speed reading is exactly 2.5 mph high. Personally, I'd rather have the mileage right. I could have gone the other way, but figuring out the mileage would be WAYYYYY too much math.

[pcarrell]

I've been told that the electronic speedo's often read 7%-10% low.

[nhtrikes]

Have an '02 1500 that is posting much higher speed than actual. Posted speed 35 - actual 30, posted 80 - actual 70. I know it is an electronic speedo not cable. Is there a way to calibrate it or do I need a new sensor? Also, where is the sensor located and is it hard to get at? Thank you!

Pete