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Speedometer Calibration
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  (#1)
I'm a Rookie, How do I Wheelie?
 
Posts: 3
Join Date: January 29, 2008
Location: Bristow, VA
Speedometer Calibration - January 29, 2008, 09:41 PM

I recently took my front sprocket down one on my ZZR600 and I love the additional torque I'm not crazy about how much it threw off my speedometer. I was told that this can not be corrected; is this true if so no biggie I'll learn to live with it but would love to be able to correct it if possible.

Any thoughts or input?
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January 29, 2008, 09:51 PM

Not impossible to correct. Just not worth it. Find a radar sign and learn the percentage. (eg. sign says 45 to your speedo's 50 means you're going 90% of whatever your speedo says).

On my GSX-R I just know that speedo 65 means 61 real mph (hence 186 mph is really only 174 real mph or so).

Reminds me of an idiot I know telling me he had a friend on a Busa doing 225 mph. Funny that he doesn't realize you need more than 300 horsepower to do that on a Busa.


Johnny V.
CCS & ASRA #67

2006 Suzuki GSX-R1000
2004 Suzuki GSX-R600 (racing)
2004 Aprilia 1000 Mille R (street)
2001 Aprilia 1000 Falco (street)
2001 Suzuki GSX-R600 (racing)
1995 Kawasaki ZX-6E (street and racing)
1986 Yamaha Radian 600
(street)
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January 30, 2008, 06:53 AM

http://www.tobefast.com/speedo-heale...al-pr-957.html


"I didn't know they gave out rings at the Holocaust"

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January 30, 2008, 06:54 AM

I'm probably wrong about this but can't any shop that has a dyno do this?


RIP Greg Walker, I will never forget you

If everybody thought before they spoke, the silence would be deafening
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January 30, 2008, 08:05 AM

Quote:
Originally Posted by jtatooz
I'm probably wrong about this but can't any shop that has a dyno do this?


Nope ... any shop with a dyno can tell you how far off your speedo is from correct. A speedo healer should do the trick though and we can install them.


God Speed Jeff! You'll never be forgotten.

BOOSTZX3 : in all seriousness head injuries ain't no joke. I've had around 10 concussions and now I ride a Buell Don't let it happen to you!
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Spike
 
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January 30, 2008, 08:16 AM

Blah, I was close!


RIP Greg Walker, I will never forget you

If everybody thought before they spoke, the silence would be deafening
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  (#7)
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January 30, 2008, 11:00 AM

Cheaper and easier to run a small GPS unit, steady throttle at certain speeds and you can figure it out pretty easily. For example, -2 in the rear on a zx12's speedo is pretty close at 185 mph (indicated vs actual).

Good luck and don't forget to watch where you are going.

A.


Gemini Motorcycles (Sterling, VA)
www.GeminiMotorcycles.com
ZX14: 243 mph
ZX12: 229.6 mph
ZX10: 202.8 mph

ZX9: 177.6 mph
ZX6R: 180.8 mph
Ninja 650: 130.7 mph
Ninja 400: 123.5 mph

EX300: 114.7 mph
EX250: 122.4 mph
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January 30, 2008, 11:07 AM

Quote:
Originally Posted by shiphteey
Cheaper and easier to run a small GPS unit, steady throttle at certain speeds and you can figure it out pretty easily. For example, -2 in the rear on a zx12's speedo is pretty close at 185 mph (indicated vs actual).

Good luck and don't forget to watch where you are going.

A.
That's how I checked the speedometer on my VFR. Fortunately it's off by 10% which makes the math easy.
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I'm a Rookie, How do I Wheelie?
 
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January 30, 2008, 09:21 PM

Thanks for the input all, read up on the Speedohealer and that sounds like the perfect fix and can likely install it myself with a couple of test runs next to a friend in a car to make sure calculations are correct. Appreciate all the help!!
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  (#10)
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January 30, 2008, 10:10 PM

Remember not all cars are perfect either although they aren't as off as bikes for the most part. My old Geo metro was dead on 85 for 85, and the Toyota p/u truck is the same. Stock sized tires have a bit to do with it. Just don't want you calibrating with something that isn't and thinking you're not speeding when you may be.

A.


Gemini Motorcycles (Sterling, VA)
www.GeminiMotorcycles.com
ZX14: 243 mph
ZX12: 229.6 mph
ZX10: 202.8 mph

ZX9: 177.6 mph
ZX6R: 180.8 mph
Ninja 650: 130.7 mph
Ninja 400: 123.5 mph

EX300: 114.7 mph
EX250: 122.4 mph
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  (#11)
I'm a Rookie, How do I Wheelie?
 
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January 30, 2008, 10:15 PM

Totally with ya, my girl just got a new Tahoe so I was going to run next to her to get an idea. If I get it back within a couple I'll be happy it seems to be off by as much as 10mph so as long as i get it back within a couple i'll be happy as I would be suprised if it was perfect just a few weeks ago when i first brought the bike home. Wish me luck
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January 31, 2008, 06:35 AM

eh.. most speedo are off to a certain degree - even the OEM ones...

I run GPS to verify mine, and then figure out the percentage afterwards... If you don't have a GPS - you can match speed with someone esle in a car.. .I usually will match 25, 40, 55, 65 - to see how far off I am... I have done this for others in my car that is running GPS..
Also, I know allot of folks who will get a bicycle computer to verify there speed - and from experience - they appear to be more accurate...Why $35 item is more accurate than the OEM - I have no clue - but it works..


-Jason
DAMN Rider DAMN Rider

Maybe you have to be messed up... before you can step up!
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January 31, 2008, 08:17 AM

I think most of the speedo healers call for you to run a certain distance based on mile markers and calculate the necessary correction factor rather than comparing it to another vehicle.
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