07-14-2014, 07:59 PM | #45 |
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damn!! when did you order?
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07-14-2014, 08:01 PM | #46 | |
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Very suspicious to me that BMW claims only 2-3%. It's quite glaring on most recordings I've heard. I guess I'll have to wait till I can drive it myself. |
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07-14-2014, 08:04 PM | #47 |
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What impact on results are you suggesting this would have? You can dyno the same car in 3rd, 4th, and 5th and get the same numbers within a few %. Higher gears will be a bit lower, especially in automatic transmission cars, but only due to the higher drive train losses of higher gears. Ratio has nothing to do with results. If it did you could never account for rear end ratio variation.
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07-14-2014, 08:35 PM | #48 | |
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It won't be the "S65's legacy" because your statement is not factually accurate. |
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07-14-2014, 09:00 PM | #49 | |
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Further, for a given acceleration rate, the faster the wheels/tires are spinning, the more power is consumed to accelerate the wheels (P=mva). Here it is more tricky. Since a lower gear increases the acceleration rate and a higher gear increases the rotational speed, by trial and error, you need to find the gear that is at the sweet spot to minimize inertial impacts. Transmission efficiency does not vary much gear to gear, except for transmissions that have a direct drive 1:1 ratio. There is significantly less loss in such a ratio. That is exactly the point. It is very difficult to compare different cars on chassis dynos. Last edited by CanAutM3; 07-15-2014 at 07:48 AM.. Reason: Revised my text: rolling resistance does not vary directly with the cube of speed but with a dependency to the cube of speed |
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07-14-2014, 09:30 PM | #50 |
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This just makes me anxious for Chris Harris's review. I like Carlos, Jonny, Ed, Angus and even the beautiful Jessi Lang a lot over at Motor Trend but nothing they do can purvey what Chris Harris does.
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07-14-2014, 09:32 PM | #52 | |
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07-14-2014, 09:35 PM | #53 |
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07-14-2014, 09:40 PM | #54 |
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Don't think he meant it felt like a M5 in that sense. I think the comparison here is that it feels like a small M5 because of the (same?) DCT, both are turbocharged (hence the heaps of low end torque) and perhaps the differential and not that it feels bloated and heavy and handles as such.
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07-14-2014, 09:46 PM | #55 | |
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07-14-2014, 09:47 PM | #56 |
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07-14-2014, 09:53 PM | #57 | |
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07-14-2014, 10:00 PM | #58 | |
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07-14-2014, 10:10 PM | #59 |
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I like his videos, but he has such a strange speech pattern it's downright distracting.
Somebody clearly told him that a pause was much better than saying um or uh, and the big pause......before a verb... just gets old. Yes I've had a few drinks and was raised by a speech pathologist Great video, nice work, really want an M3, as quickly as possible.
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07-14-2014, 10:10 PM | #60 | |
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As for this subject, I'm just going by the pulls I've made on dyno's with my other cars. I agree that there's variation between dyno's, but when you're on the same dyno, doing 3 consecutive pulls in 3 different gears, and very little changes, it calls into question the importance of the gear you do the pull in. |
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07-14-2014, 10:46 PM | #61 | |
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07-14-2014, 11:06 PM | #62 | |
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07-14-2014, 11:10 PM | #63 | |
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07-14-2014, 11:19 PM | #64 |
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People are failing to realize that the dyno they tested both cars on are very low reading dynos. And if you don't believe that the new m3 is that much more powerful than the previous m3, take a look at the 1/4 mile times. The best time I think I've ever seen from an e9x m3 with DCT is 12.6 @ 113mph. This current m3 runs 12.2 @ 117mph.
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07-15-2014, 12:32 AM | #66 | |
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The highest trap so far is 120.9. So a 7.9 mph delta between the two cars. Big big difference |
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