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Old 04-23-2011, 07:25 AM   #1
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Default Speedo error

Has anyone had any luck trying to correct the speedometer error? My T1N/Roadtrek Agile reads about 5 mph fast at 65 (actual speed 60).
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Old 04-23-2011, 07:42 AM   #2
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Default Re: Speedo error

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Originally Posted by sssagiledriver View Post
Has anyone had any luck trying to correct the speedometer error? My T1N/Roadtrek Agile reads about 5 mph fast at 65 (actual speed 60).
Are your tires the factory/stock rim and tire size?

Last edited by OrioN; 04-23-2011 at 03:42 PM.
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Old 04-23-2011, 08:12 AM   #3
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Default Re: Speedo error

it should be 5 mph less not advanced.
MB has a specific built-in error of margins 10% - and 10% + [A]..because of electronics, and [B]..as to varying tire sizes and or dimentaions.
Hence as an example your trip meter is 99.999999% accurate.
Richard
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Old 04-23-2011, 02:19 PM   #4
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Default Re: Speedo error

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Originally Posted by Altered Sprinter View Post
it should be 5 mph less not advanced.
MB has a specific built-in error of margins 10% - and 10% + [A]..because of electronics, and [B]..as to varying tire sizes and or dimentaions.
Hence as an example your trip meter is 99.999999% accurate.
Richard
If they are smaller diameter it will read higher.
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Old 04-23-2011, 03:12 PM   #5
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Default Re: Speedo error

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If they are smaller diameter it will read higher.
True but who runs smaller than 15"?
Sprinters are designed to run 15' and 16" plus the size variations or differencing tread patterns of heights and width. .
Richard
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Old 04-23-2011, 03:28 PM   #6
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Default Re: Speedo error

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Originally Posted by Altered Sprinter View Post
True but who runs smaller than 15"?
Sprinters are designed to run 15' and 16" plus the size variations or differencing tread patterns of heights and width. .
Richard
Ya neva know what some folks do.
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Old 04-23-2011, 03:31 PM   #7
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Default Re: Speedo error

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Originally Posted by OrioN View Post
Ya neva know what some folks do.
I know that's why I'm asking too
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Old 04-23-2011, 03:39 PM   #8
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Default Re: Speedo error

He could be running 13" and hydraulic suspension and the van was featured on Pimp My Ride for all we know.


BLING!
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Old 04-23-2011, 03:39 PM   #9
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Default Re: Speedo error

You've got a number of quick/simple ways to "correct" the speedometer:
(a) if you have 15" wheels, upgrade to 16". Then the speedo will be accurate (but your odo will be off... think "longer warranty")
(b) buy a ScanGauge (or equivalent)... the MPH *it* reports is spot-on accurate.
(c) install a GPS, which also can provide accurate speed reports.
(d) add an accurate scale to your existing meter (stick-on marks for the cardinal 30/40/50/60/70)

I use (b) and (c).
--dick
p.s. for what it's worth, my new Kia also reads "faster" than i'm actually travelling. It gets (c).
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Old 04-23-2011, 03:43 PM   #10
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Default Re: Speedo error

Or an Irish mile they're always dodgy.
Richard
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