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05-26-2014, 07:31 PM | #23 |
TIM YOYO
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The M3/4 has specific jack points underneath.
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05-26-2014, 08:08 PM | #24 |
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Yes, there is for jacking to change tires. BMW usually has a jack point under the front end for jacking both front tires at the same time which is useful for oil changes. At the rear I've used the diff to jack both rear tires at the same time for diff fluid changes and suspension work. The fins will not be a good jacking point for the rear.
Or are you saying that there is a rear jacking point that I'm not aware of? |
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05-26-2014, 08:48 PM | #25 | |
TIM YOYO
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The rear sub-frame on the F8x is steel, so there should be a safe enough jack point somewhere back there, but I don't think the car comes with a dedicated center jack point in the rear.
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05-26-2014, 11:02 PM | #26 |
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Great video with plenty of technical details. Certainly defines just how advanced the F80 has become from prior M models. Loved the differential cooler.
Thanks for sharing. |
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05-26-2014, 11:14 PM | #27 |
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The solution for jacking up the car, even using the bmw specific jacking points, is to use a floor jack and put a hockey puck in-between. The reason for this, as I learned, even the bmw jacking points, will get damaged (those plastic gaps) from any floor jack (mine did) they eventually start getting deformed over time from the floor jack digging into it, the damage doesn't compromise the integrity or anything but hockey puck works wonders.
I never jacked up the car from the diff before, but I don't see why you can't, and if u fear damage to the fins just use a nice little hockey puck. |
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05-27-2014, 02:39 AM | #28 |
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Did the e92m not have cooling vanes on the diff?
I give props to the CFRP driveshaft and directly bolted rear subframe and more rigid structure to provide better road feel and steering feedback But how did this add or subtract to the nvh characteristics? I also wonder it the active sound grows on your or becomes annoying... Nonetheless it sounds pretty cool and how it pairs of the exhaust from the cabin |
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05-27-2014, 06:54 AM | #30 |
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Are people surprised to see cooling fins on the diff?
The E46 M3 has those as well as the E9X M3. It's a trademark M feature |
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05-27-2014, 07:59 AM | #31 | |
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While the diff is attached to the rear sub-frame, but it's not engineered to support the load of the car. With an independent rear suspension, the downward load of the car's weight is primarily transferred up through the shock supports from the wheel carriers and to the sub-frame through suspension members. The diff is attached by some pretty serious hardware, but it's still not engineered as a load bearing member, so it's best to avoid it when jacking the car up.
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05-27-2014, 08:01 AM | #32 |
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Yep. Pretty much any car with a clutch based LSD will have some kind of cooling; usually fins on the diff.
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05-27-2014, 09:00 PM | #34 |
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He said they made the car much stiffer in the front for better steering feel and feedback. New axle carrier helped with the extra anchor points. He just didn't wanna say how much stiffer it would be than a regular series.I think its relevant because I wanna have a stiffer and more communicative chassis in an ///M than you get in the regular one
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05-27-2014, 10:04 PM | #35 |
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Diff cooling fins
Here are the E90/2 ones.
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05-28-2014, 03:25 AM | #36 | |
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Quote:
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