05-11-2020, 11:53 AM | #24 |
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Wasn't it just for the transmission? Didn't recall anyone saying it's also for dampers.
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05-11-2020, 02:00 PM | #25 |
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Ride quality is the path from the road to the driver’s gluteus.
Tires —> wheels —> ball joints —> bushings/dampers/springs —> seat —> gluteus If anything has changed in this system it affects ride quality. Given that tyres are consumable and that the OP has an adjustable suspension, these are where I would focus. Particularly if you have runflats. Imo runflat tires, aka extended mobility tires, are the worst invention in modern automotive history. Followed secondly by significant thinning (downsizing, cheapening) of automotive glass. |
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05-11-2020, 03:34 PM | #26 |
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The longer I drove on RFTs the more fed up with them I became. They weren’t terrible but there’s a certain signature to their ride that constantly told me what I was riding on. It got too much, I felt it on the M40i test drives so I ordered non-RFTs on 20s and I’m pleased I did.
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05-11-2020, 08:28 PM | #27 |
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I detested the Bridgestone RFTs that were on my 2009 335i (Potenzas). But the Bridgestone Alenza RFTs on my current m40i are not as uncomfortable.
I don't get the feeling of the car riding on wooden cart wheels, even though mine are the stock 21 inch wheels. I'd still consider changing to non-RFTs when the time comes...
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05-12-2020, 11:39 AM | #28 | ||
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05-12-2020, 11:43 AM | #29 |
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There is a lot of runflat bashing here. When my wife is driving home on a rainy night, I would rather she be driving on runflats than any other tire.
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05-12-2020, 02:32 PM | #30 | |
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What's Sport mode like? Is there a definite difference between Comfort and Sport? Prove there is a switching on the suspension modes, Comfort to Sport and back to Comfort. Tires are a bit of a red herring, if only slightly worn and similar ambient temperatures. |
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05-14-2020, 09:24 AM | #31 | ||
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05-14-2020, 09:29 AM | #32 |
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I drove 19", 20" and 21" RFTs on demo cars with adaptive suspension before I purchased my wife's X3 M40i. I could easily tell a difference between adaptive and comfort on all three tires but it was most noticeable with the 21". It wasn't a massive difference, but it was there. We ended up with 19" RFTs with adaptive and in adaptive, it is downright comfy GT cruising. In sport, it is hard and annoying because the 19" high wall tires can't keep up with the suspension and drivetrain. Turning hard is scary. I would have preferred the 21" but my wife picked the tires and we tow with this car, so the 19" are a better fit for now.
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05-16-2020, 07:35 PM | #33 | |
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I tried multiple times to see if there's a difference between adaptive and comfort modes but I really couldn't tell. If there's a difference it must be soooo small that it doesn't matter comfort-wise. |
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05-17-2020, 07:32 AM | #34 | ||
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05-18-2020, 04:28 AM | #35 | |||
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05-18-2020, 07:42 AM | #36 | |
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The way I see it, you shouldn't really feel too much difference as the chassis responds to the demands around you. Driven by both sensor input and the predictive element. For example, in a passive suspension system, (with a comfort bias), as you drive harder the chassis moves around and you sense some 'lack of control', it is the nature of the dynamics. An active system, there is less drama as you work it a bit harder, the suspension can respond more, as the settings firm up within the Comfort damping map. Adaptive mode widens that envelope even more. There should be less disturbance as you work the chassis harder, dynamics shouldn't fall apart, as if it is running too soft. The sport end of the settings 'take over' to control the chassis, as and when necessary. But will back off immediately, when not essential, ensuring a comfortable ride. In other words, Adaptive mode is keeping better chassis control on demand, than Comfort alone can. |
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05-19-2020, 12:53 PM | #37 | ||
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I didn't know that the adaptive suspension system comes with a predictive algorithm, what I had in mind before is that the system analyzes and reads the road surface and reacts to imperfections in a matter of milliseconds (I once read on a bmw website that it can react up to 400 times per second). |
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05-19-2020, 05:35 PM | #38 | |
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05-21-2020, 02:42 PM | #39 | ||
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05-21-2020, 03:30 PM | #40 |
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Never say never but in the UK in 45+ years of driving I’ve not had any more than slow punctures. The compressor will cope with these. The TPMS gives early warning too. Of course I could have a catastrophic failure tomorrow. The car being an SUV is an irrelevant distinction for me, I don’t drive off road. Our TT has no spare either and the TT isn’t offered with RFTs so what’s the difference?
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05-21-2020, 05:01 PM | #41 | |
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But tbh I don't dare sacrifice the RFTs feature, of being able to go a reasonable distance on a flat tire, for a very minor comfort difference while not having a spare tire to back you up when needed . Most of X3 owners (and recent BMWs) have went the non RFT route though. |
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05-21-2020, 05:16 PM | #42 | |
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BTW the non-RFTs were an option offered by BMW in the UK. Last edited by clivem2; 05-21-2020 at 05:26 PM.. |
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06-10-2020, 12:20 AM | #43 |
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I drive in adaptive mode in city street speed, 45mph or under. Once I'm on the highway I find adaptive actually less comfortable that comfort - so I switch over to comfort on highways.
Also, I find that adaptive starts out more comfortable than comfort and changes to firmer as soon I jab the gas pedal (which I do often). In those instances I switch to comfort and then back to adaptive. That seems to "reset" adaptive back to the most comfort position... until I redline my car again. |
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06-10-2020, 07:06 AM | #44 | |
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