Speedo question

BlueStreak

.040 Over
Joined
Jul 16, 2008
Messages
75
Location
Smyrna, TN
I've read several places that the rocket speedometer isnt too accurate. How much is it off, and in which direction?

I go along with the flow of traffic on the interstate. Where I am driving, most cars usually go around 80. My speedo is saying around 88-90. Any idea how fast I am actually going?
 
I believe general consensus is its off by 6-7%. When my speedo reads 75 my GPS reads around 71.
 
I just took a weekend through the Central Valley following my wife in the little SUV. I clocked her at 90 for about 1n hour and a half before we pulled off the freeway.

I told her that I was impressed that she did 90 the entire way. And she insisted that she had the cruise control set at 75. WTF!?!?!?!?

I'll be taking the bike in for a regular service this weekend. I'm told they can make the adjustments on it.
 
My speedo is so far off I have quit looking, Keep your eyes on the mirror for flashing lights, far more accurate
 
Social engineering at it's finest There was, and I see it hasn't changed, a ball park 7% high side error. Yes, the TuneBoy can adjust this pita.
 
They must think we are all a bunch of saps. My BMW was just as far off. There was a fix. but it ment removing all the tupperware, 3-4 hours, resoldering a wire into a correct locatation, without frying the rest of the instruments, and reasemble tupperware. Ruin a day and take the chance of a $1800.00 melt down on the dash componants. What a POS
 
HeR3tic said:
I've found GPS devices and spedos have a guaranteed error unless you're dead still.
Click to expand...

You may be right. At a dead stop my GPS and speedometer both read zero. I'm quite confident that both are correct.

BTW, with a Tuneboy 6% correction, my speedometer now reads 50 when the GPS shows 48.
 
I think cops rely on the standard speedo error (not just on this bike, it's in just about every "modern" car I've owned).

When they pull you over and ask, "Do you know how fast you were going" and you're honest and tell them exactly what your speedo said, they'll ticket you based on your answer, even though they know you were barely over the limit.

Just a thought.
 
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