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BMW 3-Series (E90 E92) Forum
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Speedometer
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| 04-23-2014, 11:47 AM | #1 |
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Private First Class
 
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Speedometer
So I was talking to an older guy and I was telling him about all the mods I have. I told him I have around 400 rwhp.
He said I have to be careful with my speed because the mods are throwing of my speedometer ? Is this true? |
| 04-23-2014, 11:51 AM | #2 |
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I'll get back to you
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The only mod I can think of that might throw off the speedo is changing tire size. easy enough to check your speedo against a portable nav or someone with a radar gun.
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| 04-23-2014, 12:32 PM | #3 |
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Colonel
 
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Tire size is the only factor.
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| 04-23-2014, 03:22 PM | #4 |
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First Lieutenant
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To be precise: Tire size AND status of wear. A new tire has a greater circumference, thus rotates slightly slower at a speed compared to a bald tire at the same speed. So, your speedometer will overestimate your true speed with bald tires.
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