03-31-2023, 03:19 PM | #67 | |
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Tire width would definitely affect the Cd value, but all tire options are the same widths.
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03-31-2023, 03:31 PM | #68 | |
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Maybe the fins on the CF roof have a greater impact on the M3 due to its greater height, so a greater difference between CF and sunroof options? Just speculating here, it could be many things.
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03-31-2023, 05:10 PM | #69 | |
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but what i don't understand - M550i Cd is 0.22 M340i Cd is 0.23 Why is the M3 so bad? |
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03-31-2023, 05:22 PM | #70 | |
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03-31-2023, 06:02 PM | #71 |
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“Bad” is relative. Often, a “slippery” shape yields a lot of lift. To counter lift, downforce features need to be added and they increase drag. Further, as I posted earlier, radiator air inlets are terrible for drag and the M3/4 have a lot of them for performance reasons.
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03-31-2023, 06:08 PM | #72 | |
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03-31-2023, 08:05 PM | #73 |
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I want to trade my RWD in for an AWD so bad. I wish I would have wait 4 months to order one. Oh well.
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03-31-2023, 08:53 PM | #74 | |
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03-31-2023, 11:28 PM | #75 |
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My guess is that the transition from roof to trunk on the m3 interacts with the rear MPP spoiler slightly more than the smoother transition M4 which is why the m3 has a range and the M4 does not. Otherwise everything else on the cars are either the same or static and wouldn’t drive a variance.
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04-01-2023, 12:07 AM | #76 | |
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04-01-2023, 02:33 AM | #77 | |
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04-01-2023, 11:36 AM | #78 |
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Cd is a coefficient. The M3 could still have less drag with a higher Cd due to surface area differences. Note that the M340i and M550i have active grills that open and close. I wonder if this Cd is with them closed?
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04-02-2023, 07:40 AM | #81 |
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You probably mean frontal area. "Surface area" is already imbedded in the coeficient.
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04-02-2023, 01:42 PM | #82 |
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Both cars are the same length with the same wheelbase per BMW specs. I’d assume that means the floor length is, near as makes no difference, the same.
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04-02-2023, 06:02 PM | #83 |
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It's a challenge, but traffic mostly limits that if you want to keep your car in one piece. I mostly drive in comfort mode and it's still plenty rowdy and hard to resist.
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04-03-2023, 07:37 PM | #84 | |
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F series I did not feel safe over 105. It was like driving a marshmallow. |
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04-03-2023, 09:35 PM | #85 |
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Interesting...never felt that way in the F series cars I had...and pretty much all my track time (and a good chunk of my Autobahn time) was in them.
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04-04-2023, 05:58 AM | #86 | |
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Because both my F82 felt very well planted up to their top speeds (over 170mph).
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04-04-2023, 09:46 AM | #87 | |
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It’s really a night and day difference in my experience. One feels like a strong breeze could flip you traveling @ 120mph (340i) and the other feels rock solid (m3). |
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04-04-2023, 09:56 AM | #88 |
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Never had that issue with my 230i THP (the lightest of the bunch). Hummed right along at 120+ for nearly 100km on Autobahn 3 on way down to Frankfurt from Cologne for ED drop-off. GPS unit registered 157 as the top out. The 228/230 with THP were unsung standouts of the non-M F range.
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