Speedo Speedometer reading way out - Civinfo
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post #1 of 11 (permalink) Old 6th October 2016, 23:13 Thread Starter
 
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Speedometer reading way out

Hi all,

New to the forum and new to civics! So go easy with me!

I've just bought a 2006 civic cdti sport and love it. However, I've noticed the car feels slow at any given speed.

I used sat Nav and a GPS app on phone to see what speed for example doing 40mph on speedo read approx 30-32mph on Sat nav/GPS. Surely this can't be normal?

I know speedos are generally a few mph over but 10mph?

Problem or normal?
Any help is much appreciated!
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post #2 of 11 (permalink) Old 6th October 2016, 23:23
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What wheel size is on it?
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post #3 of 11 (permalink) Old 6th October 2016, 23:31
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A 10% leeway is to be expected and perfectly normal.

You seem to have a larger discrepancy and wheels and/or tyre profiles should be double checked.

Oh and welcome to :civinfo'
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post #4 of 11 (permalink) Old 7th October 2016, 06:32 Thread Starter
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Thanks for the quick replies. Wheel size is 18". I'll double check tire size later. If it's a case of wheels being too big, can I get the speedo recalibrated? Can any garage do it or just a honda garage? Cheers
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post #5 of 11 (permalink) Old 7th October 2016, 07:06 Thread Starter
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Apologies for previous post, wheel size is actually 17" and tyre size is 225/45/17.
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post #6 of 11 (permalink) Old 7th October 2016, 08:03
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Very odd that it is that far off.

If you want a third party solution:

http://www.civinfo.com/forum/how/834...te-speedo.html
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post #7 of 11 (permalink) Old 7th October 2016, 10:00
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I have up to 8 km/h difference with same combo but the tires are a bit soft. With my winter tires(225/50/17) i have 3 km/h difference.

Last edited by Aftermath01; 7th October 2016 at 13:16.
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post #8 of 11 (permalink) Old 7th October 2016, 10:21
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Quote:
Originally Posted by keysy123 View Post
Apologies for previous post, wheel size is actually 17" and tyre size is 225/45/17.
That wheel/tyre combo is okay.
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post #9 of 11 (permalink) Old 8th October 2016, 13:58 Thread Starter
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So double checked today against a mates car. 70mph on Sat nav and what mate said he was doing said 86mph on speedo! Garage I bought it from are going to look into it for me
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post #10 of 11 (permalink) Old 8th October 2016, 14:23
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The over read is most likely done by the speedometer unit itself.
The VSS records the true speed, the ECU sees this speed ad then sends it off to the speedometer.

Now the ECU could tweak it before sending it off.

Only real way to know is test between two speedometer units which over reads are known and not the same.

My civics over read was 4%.
My imps over read is 8%
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post #11 of 11 (permalink) Old 9th October 2016, 15:14
 
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When pressed to answer, nothing happens, and the key for voice commands normally do. I do not know what to do, and I can not find Bluethoot on your cell phone. please help!!!!
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