| Author | Message | ||
     Dagofas |
This summer i rode with about 20 bikes on a ride that I not would forget. They considered of a'lot of gsx's & R1's. I own a 03 xb9sl with a race kit & no other perm. mods to the motor. They could not believe what in there mind was a shit box BUELL V-TWIN WITH NO REP. COULD KEEP UP WITH WHAT THEY WERE DOING. They told me that i WAS DOING 155 MPH AND I JUST SMILED AND Said your speedo needs some adjustment.I think our average speed for the day was about 120 & i was killing to keep up, but boy was it fun!!!!!!!!!!!!!!!!!!! | ||
| Gschuette |
155? Uh huh yeah sure. | ||
| Pwnzor |
That's funny considering an XB9 can barely make 130 with a tailwind. Maybe thats why ricers think they're so fast, because their speedos don't work! | ||
| Rah7777777 |
its all part of the sales pitch! the import companies want the ricers to think they are getting the fastest bike for there money. Look back at yamaha with there 17,500 redline on the R6 a couple years back. when it was dynod it got like 16,400 or something like that. and those engineers knew exactly what they were doing! just a sales pitch. (plus I bet some of them re-toothed there sprockets, so it read even higher!) | ||
| 46champ |
Speedo's reading high is a ploy by some of the manufactures to pay less in warranty costs. If the warranty millage is up no more warranty. | ||
| Birdy |
Fed law gives them very little room for that. Honda had to extend the warranty on a lot of the Civics because of the ODD reading high. | ||
| 46champ |
Isn't the ODD error specification still a percentage? My next question is at what speed is it figured at? So if the max it can be off is 5% at 60MPH that would be 3 MPH at 150 it would be 7 1/2 MPH. I'm not shure of the percentage or the MPH it's figured at and if it's 10% the number would be worse. Birdy Thank you for reminding me it was the evil empire that got caught weren't they off a bunch like 15%? | ||
| Birdy |
Not sure how much it was, 12%-14%? but I followed it closely until I found out my year Civic wasn't one on the "Problem" years | ||
| Thespive |
Bottom line, there is no way an XB9 went 155, especially with stock gearing. --Sean | ||
| Anonymous |
It's perfectly possible to build almost dead accurate speedometers -- the digital one on the 1125R is one. Interestingly enough, you find that some Japanese speedometers get increasingly far off as you go faster -- the percentage error increases from the maximum allowable amount at speeds below 100 mph to truly absurd levels, so you may be indicating 15+ mph 165+ at a true 150. Creating a speedometer like that took some creative software, and is a marketing, not an engineering issue. | ||
| Court |
>>>>Fed law gives them very little room for that. What Federal Law? The Feds regulate odometers, in the Federal Odometer Act but I am unaware of them regulating speedometers. If you happen to be dealing with a bus, or truck . .
But for cars . . . well. I'm not sure. I'd use caution. There is an SAE (Society of Automotive Engineers) guideline but I am unable to find any reference of it ever being adopted, referenced or enforced. | ||
| Dagofas |
Sorry if i implied that i was doing 155mph. I was only making a joke about how wrong they were. I know that my xb9 will only grab 135, at least by my speedo, and believe you me i've had her there plenty of times. (Mazomanie, WI) | ||
| Nevrenuf |
i'm more apt to think my gps is more accurate than my speedo which is why if i have it hooked up, i'll look at that instead. i've had as much as a 4mph difference on different cars that i've rented and most of them are foreign. | ||
| Thespive |
I like that my XB9SX reads 2 or so mph fast (according to the GPS), it helps me when I am on those low speed limit streets. --Sean | ||
| Polacking |
The most accurate speedometers are the ones that say certified on the faces. To be called certified you need to produce less than a 1% error. Law Enforcement vehicles that come from the factories as certified patrol vehicles have them, and believe it or not so do all newer Harley-Davidson motorcycles. | ||
| Corporatemonkey |
I like that my XB9SX reads 2 or so mph fast (according to the GPS), it helps me when I am on those low speed limit streets. --Sean +1 this is exactly what I have found on my cityx. The highest I have registered on my gps was 127. At the time the speedo was just getting into the 130's. I considered this perfectly acceptable. | ||
| Mtch |
one reason that speedos are inaccurate is because of tyre wear. would be interesting to check the speedo against GPS when new and then on its wear limit, just to see if there is much difference. if a tyre is worn by 3/8" or even 1/2" off its diameter it might make quite a difference at high speed. anyone care to calculate the possible error? in the UK there is an allowed error of 10% over the true speed, but the speedo is not allowed to under read and give a lower reading than the actual speed. | ||
| Azxb9r |
The most accurate speedometers are the ones that say certified on the faces. To be called certified you need to produce less than a 1% error. Law Enforcement vehicles that come from the factories as certified patrol vehicles have them I had to laugh when I read this. Theoretically it should be true, but when I was in high school I had an old police car. The speedo had "police certified speedometer" printed on its face. The funny thing is that it was 10% off. The unfortunate thing is that it read 10% low, when it said you were going 55mph, you were actually going a little over 60mph. Yes, it was a highway patrol man that brought this to my attention.  I always thought it was funny that the "police certified" speedo was so far off. Back on subject, I have noticed that my Buells speedo reads a little high, but as others have mentioned, that helps cut down on tickets.  | ||
| Bombardier |
As your tyres wear your indicated speed also increases due to the decreasing diameter of your rear/front tyre. | ||
| Borrowedbike |
Certified, requires matching of tire size, and RECERTIFICATION, the PoPo spend a lot of tax dollars maintanig their vehicles. +2 on the GPS, I was a few MPH off on my stock spedo, GPS is hard to argue with... |
