Computer Speedometer fix for 18" wheels - Civinfo
 
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post #1 of 4 (permalink) Old 8th March 2014, 12:44 Thread Starter
 
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Speedometer fix for 18" wheels

Hi guys,

Now I have 18" alloy wheels, and I know that speedometer will not be accurate. There is a way to change some settings in ECU to be accurate?


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post #2 of 4 (permalink) Old 8th March 2014, 12:45
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Have you measured the rolling radius.


The stock speedo is inaccurate for this eventuality anyway
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post #3 of 4 (permalink) Old 9th March 2014, 14:18
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If you've kept the actual tyre size the same, they will be as accurate as they ever were.

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post #4 of 4 (permalink) Old 9th March 2014, 15:50
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You had 245/45/17
You should use 245/40/18

The speed error is not handled by the ECU as far as i am aware.

When i plug my ELM327 in and look at the Seed(OBD) live data it is the same as GPS speed.
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