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07-30-2007, 09:43 PM | #45 | |
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SMG debate
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Link: The whole thread is a bit long but some good debate and opinions. However with a DCT the shift has already been pre-selected so there is only a single simultaneous one clutch in and the other out = very fast. All that being said not sure I am confident of .008s (8 ms) time. IN reality maybe a bit slower, but compared to a human or SMG still no contest. |
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07-31-2007, 12:29 AM | #46 | |
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07-31-2007, 01:59 AM | #47 | |
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Best regards, south |
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07-31-2007, 02:58 AM | #48 | |
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Inconsistent
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BTW, if I remember correctly you never finished this small "debate" back then. I claimed the article seemed to use fairly scientific techniques and even reported a margin of error. You never came back with any solid proof to validate BMWs claims. |
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07-31-2007, 03:22 AM | #49 | |
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EDIT: OK, it seems like you're right and I was wrong about that. The 80ms and 65ms respectively are indeed for the gear shift time only! Some did also measure a time of about 250-300ms on the M3 E46 for a S6 shift. The graph that was shown in the german magazine did fool me. Now you know why I never came back to the debate. Best regards, south |
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07-31-2007, 04:02 AM | #50 | |
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Drives: 2011 Dakar Yellow M3, 2018 M5
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swamp, i'm quoting myself here because i'm not sure if you even saw this post (which btw is the last post on the first page). it's safe to say that this could only be the result of a discrepancy between the computer's performance model and the real thing. given that the car as tested by car and driver was a 6mt, it's safe to assume that the flaw in your simulation wasn't a shift time flaw. my intuitive thought on it, is perhaps bmw is even underrating the hp on the M3. what are your thoughts on this discrepancy? - esquire
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07-31-2007, 05:09 AM | #51 | |
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Even if the 6MT comes in at 4.3, 4.47 is within 2%. Did you see south's post on tire size discrepancies? He found a 3% error right there in all CarTest sims. But the existence of that error is probably only accurate at 70 degrees F, with tires at 33 psi and at sea level (kind of joking here, but again, not really). I could tweak some of the parameters further but when almost all the numbers come in within 5% or so I am pleased. It all depends on the simulation and discipline. Some folks like in some areas of physics are happy with a prediction within a factor of 10. In acoustics 3dB is pretty good (a factor of 2!). For this type of thing I am very pleased with 5%. Sure wish I could get in the ball park on the 335i though... Cheers. |
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