Optmistic speedo or radar out of spec? - Chicagoland Sportbikes
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post #1 of 11 (permalink) Old 05-26-2008, 12:02 AM Thread Starter
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Optmistic speedo or radar out of spec?

goignhome the other night I passed by one of those signs that has a radar gun attached to it. It said I was doing 68 when my speedo said 75. How do I find out which is right?

3rd gear, 3500rpm, and 2500ft. before the next braking point... Nothing could be better than this!!!
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post #2 of 11 (permalink) Old 05-26-2008, 12:03 AM
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the radar gun.

-Mopar

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post #3 of 11 (permalink) Old 05-26-2008, 12:04 AM
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gps to verify, but Id beleive the radar

-Jason
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post #4 of 11 (permalink) Old 05-26-2008, 12:14 AM Thread Starter
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Is it worth it or even possible to get the speedo to read accurately? And does this mean that I have less actual miles on the bike too?

3rd gear, 3500rpm, and 2500ft. before the next braking point... Nothing could be better than this!!!
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post #5 of 11 (permalink) Old 05-26-2008, 12:22 AM
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There's a product called speedohealer, but really, I don't think it's that big of a deal. Will save your butt on day from getting a ticket!

Mount a gps and ride at different speeds. I bet you'll find a 5-10% error. On some bikes, this error is not even linear.
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post #6 of 11 (permalink) Old 05-26-2008, 12:25 AM
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Jason, you ride a ducati. Anything than can break will. Btw, thanks for the pm letting me know you got home ok. Let me know if I can help with your duc.
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post #7 of 11 (permalink) Old 05-26-2008, 12:34 AM
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Quote:
Originally Posted by GPz1100 View Post
There's a product called speedohealer, but really, I don't think it's that big of a deal. Will save your butt on day from getting a ticket!
if the monster is like my 996, the speedo is cable driven so that product will not work.

-Mopar

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post #8 of 11 (permalink) Old 05-26-2008, 01:00 AM Thread Starter
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Well I guess that means I've been more under the radar than I thought, and 70 feels a lot faster than I thought...

3rd gear, 3500rpm, and 2500ft. before the next braking point... Nothing could be better than this!!!
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post #9 of 11 (permalink) Old 05-26-2008, 02:07 AM
 
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Quote:
Originally Posted by GPz1100 View Post
There's a product called speedohealer, but really, I don't think it's that big of a deal. Will save your butt on day from getting a ticket!

Mount a gps and ride at different speeds. I bet you'll find a 5-10% error. On some bikes, this error is not even linear.
I was, in fact, under the understanding that ALL speedometers are off at a gradually increasing rate as speed increased. I'm not a mechanic nor am I an engineer, but I think it has something to do with the torque on the cable at higher speeds. A mechanic tried explaining the concept to me in Iraq, where our driving habits had us changing speedo cables every other month.
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post #10 of 11 (permalink) Old 05-26-2008, 08:26 AM
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Most bikes have a 5-7% error right from the factory. factor in sproket size changes and you could be as much as 35% off.

The speedohealer works on bikes that are NON cable driven for the speedo/odo.

The speedo being off like that may save your butt from a ticket one day but it is also racking up extra miles on your speedo... if you are worried about resale value, that could be a factor for you.

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Last edited by blackrose613; 05-26-2008 at 08:30 AM.
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post #11 of 11 (permalink) Old 05-26-2008, 08:29 AM
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speedo healer is a great and adjustable product.
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