04-13-2022, 03:17 PM | #1 |
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2020 m5c top speed mystery
So...I was doing a top speed run in a safe area, and I topped my car out at 182mph. GPS verified I was at about 180mph or so. I have a stock 2020 M5C.
How is this possible? I don't have the M Driver's Package. I bought my car used but I don't think it has ever had a tune. GPS verified I was doing about ~180mph when fuel cut off. I do have non-stock wheels, but I have 20" tires that are the exact same size (285/30 R 20) so I am assuming wheels must also be the same. Only thing I can think of is that this car was sold with 285/35 R 19 and a previous owner put 285/35 ZR 20 on which could account fof a 6mph speed difference...but reading my VIN it looks like my car was sold with 20" wheels/tires. And this also doesn't explain why the 155mph limit is gone... Thoughts? Ideas? |
04-13-2022, 05:16 PM | #3 |
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Check your idrive to make sure the correct size tires are selected. I doubt this is an issue since the diameters of all factory approved tires should be the same (19”, 20” and 21”). The tire sidewall is reduced as the rim diameter is increased.
No other ideas. Not sure whether the speed limiter is coded out or can only be deleted as part of a tune. |
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04-13-2022, 07:02 PM | #4 |
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If you bought car used I am sure it had a tune and speed limiter was removed. Otherwise you would have hit limiter at 163 MPH on speedo which is 160 MPH. The speedometer is off by 3 miles per hour.
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04-17-2022, 10:03 PM | #5 | |
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Quote:
Also...why limit to 182/183mph? That makes no sense at all to me...shouldn't it be 189mph? |
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04-29-2022, 06:17 AM | #6 |
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M drivers package will let you top out at 193. Stock should top out at 163. I know that BMW has different numbers but this is my personal experience. You need to flash a car in order to remove the speed limiter so it has certainly been tuned and the warranty is probably void if it has.
But the speed limiter topping out at 183 is weird I agree. No idea why that would be the case. What gear and rpm is the car in at that speed? |
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05-03-2022, 05:24 PM | #7 |
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there have been examples that don't adhere to the stated electronic limiter at 155/163 the car is capable of 190mph when the limiter is off.
i have friend who is s feature editor at a major car mag and they regularly see examples of this. the 155 limit was a friendly limit set by manufacturers. i wouldn't be too concerned over this and it doesn't mean the car for sure has a tune. |
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