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07-19-2009, 12:50 PM | #1 |
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Stock limited top speed ?
I was under the impression that the M3 was limited to 155 mph. Yesterday on a private track I broke 160 and never hit the limiter, I had limited track time and was only able to achieve this once. Any thoughts ? Malfunctioning speedo ? My googly eyes ?ha ha
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07-19-2009, 01:04 PM | #2 |
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Nothing wrong with your speedo, they're just reading fast by some percent. Maximum indicated speed should be about 168 mph which actually translates to a real speed of 161 mph.
Best regards south
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07-19-2009, 01:14 PM | #3 |
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Not on M cars. I've seen between 168 and 171. The speed limiter is always set at indicated speed, but it's typically lower than real, as noted. With 19" wheels, which are slightly smaller in circumference than 18s, error is about 4% on my car, which is not bad at all. With 18s should be about 3% (most cars are between 3 to 5%). Hope your 'track' didn't start with an 'I' . Good day.
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07-21-2009, 01:38 PM | #4 | ||
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Thanks for your insight South ! Quote:
Thank you for your input also elp. No my track did not start with an "I". Ash |
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07-21-2009, 01:45 PM | #5 |
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When you change wheels or final drive ratio it does NOT change the error in the speedo. I've got 18" wheels, 19" wheels and a 4.10 final drive. None of those changes will change the speed registered through my local radar traps. That's because the speed is measured at the wheel hub, based on it's absolute revolutions. Mine's about 8% optomistic, which I think is fairly typical.
Dave
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07-21-2009, 02:42 PM | #6 | |
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07-21-2009, 02:47 PM | #7 | |
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How does your car run with the 18" wheels and a 4.1 final? Also compared to stock 19" wheels did the 18" wheels with the 4.1 final make a difference? |
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07-21-2009, 02:51 PM | #8 | |
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The FD difference is over 6% different from stock, yet no difference in speed shows up. Dave
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07-21-2009, 03:01 PM | #9 | |
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07-21-2009, 03:45 PM | #10 | |
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Everything's relative. A 4.10 is probably quicker in an 1/8-mile drag than a 3.85, but it may or may not be quicker in the 1/4-mile, although I suspect that it will be very marginally quicker. Dave
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07-21-2009, 06:50 PM | #11 |
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How many people have the upgraded ECU? Does it make a significant difference in performance/fuel consumption?
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07-22-2009, 07:30 AM | #12 |
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Just some more info to confirm:
On my US M3 I went 168 according to the dash, but my GPS said I was only going 162.
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07-22-2009, 02:38 PM | #13 |
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07-22-2009, 03:39 PM | #15 | |
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elp whats with you and the "track" ? your making me wonder ! |
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07-23-2009, 01:39 PM | #16 |
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