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Coding for tire/wheel change
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11-04-2011, 06:26 PM | #1 |
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Coding for tire/wheel change
SIZE change. Is it possible? Google/forum search came back empty.
Last edited by Goathog02; 11-05-2011 at 08:08 AM.. |
11-05-2011, 08:11 AM | #7 |
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you dont need to re code anything for changes in size....
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11-05-2011, 09:31 AM | #9 |
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i guess the jeep guy in me would say to change the speedometer gear, but no coding can fix that for you...
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11-05-2011, 09:52 AM | #10 |
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11-05-2011, 10:03 AM | #11 | |
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Quote:
2. Calculate the percentage difference in tire revs per mile between your old & new tires. 3. Add step 1 to step 2. 4. This will be your new speedometer error. For example, if your speedo currently reads 3% high - a not uncommon BMW error - and your new (larger) tires will have 1.8% fewer revs per mile, then your speedo would then be 1.2% high (3.0+(-1.8)). I'd also advise confirming this with a GPS. So the only "coding" is done by the driver. Tom Last edited by Tom K.; 11-05-2011 at 09:26 PM.. |
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11-05-2011, 10:37 AM | #12 |
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What size are you planning on?
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11-05-2011, 10:59 AM | #14 |
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11-05-2011, 03:11 PM | #15 |
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There's a way to do this via coding but there are side effects related to cruise control.
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11-05-2011, 06:20 PM | #17 |
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The BMW speedo normally inflates the speedo value vs true speed.
So unless you plan on putting 13" wires, any reasonable upsize should be fine. Just confirm with a gps unit. |
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11-06-2011, 09:10 AM | #19 |
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use this tool to calculate the change in speedometer reading with different size tires:
http://www.miata.net/garage/tirecalc.html |
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