01-30-2013, 05:52 AM | #1 |
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Does it have limited slip differential?
All cars I owned in the past with stability/traction control had limited slip differentials. Does anyone know if X1 has one too? This is important if one plans to use small spare tire.
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01-30-2013, 07:48 AM | #2 |
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Rear drive BMW (non-M) BMW vehicles typically do not have LSDs. The dynamic stability control uses the brakes instead. AWD vehicles are a different story of course. What are your worries using a spare?
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01-30-2013, 08:58 AM | #4 | |
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As for running a mini spare, it's never a good idea on any awd car because the system will try to allocate less power to the smaller tire to compensate for lacking traction (a faster spinning tire). This can lead to additional wear. Add an LSD into the mix (on awd, fwd or rwd) and you greatly increase the odds of damaging rather expensive internals, especially on clutch based LSD's most non race cars use. |
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01-30-2013, 10:37 AM | #5 |
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If the spare is smaller than the regular tire one would end up wearing out LSD. Probably not an issue for the very short trip though.
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01-30-2013, 10:49 AM | #6 | |
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BMW AWD systems are RWD based (until the next generation of the X1). I don't know how the X1 AWD system works. I believe that because of the way BMW DSC works and the fact that the M Sport use DSC torque vectoring (performance control) that using a donut spare is safe for emergency use (low speed, short distance). I definitely plan to do more research since I plan to remove the RFTs and carry a donut.
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01-30-2013, 11:02 AM | #7 | |
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I pulled this from WikiPedia
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01-30-2013, 11:05 AM | #8 |
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01-30-2013, 11:07 AM | #9 |
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This is a topic for a different thread, but I will never understand the desire to carry a donut. Many of us who've had M Cars, Corvettes or any BMW with the runflats removed have been dealing with this for over ten years now, with nothing more than an air compressor, a plug kit and road side assistance. I've been towed one time in fourteen years of non-RFT, non spare driving and it was due to a sidewall rupture on a heavily tracked tire that was a serious pain to mount and I'd known it was likely to blow out, but kept driving it anyway, entirely my fault.
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01-30-2013, 11:09 AM | #10 |
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S Drive has the same issue, you will have an open diff, but DSC will still brake the other wheel trying to get things back in order. You can completely disable DSC (hold the button for 10+ seconds), which will help, but this is still a very temporary fix and should really be avoided if at all possible.
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01-30-2013, 11:11 AM | #11 | |
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Again, the X6 has an available LSD for the rear, which I believe makes it the only non-M BMW with an available LSD of any sort. |
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01-30-2013, 11:17 AM | #12 |
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So, will DSC detect "slippage" when running on donut and try to apply brakes? Probably the solution would be - donut with DSC disabled.
Whether having the spare or not - it is likely personal preference. On the long trips I would rather have a spare than patch kit. I had way too many beyound repair punctures. And I do not want it to be towed. |
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01-30-2013, 11:31 AM | #13 |
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Fair enough, I guess I don't get the fear of being towed (as BMW provides flat beds) and don't really travel often with the space for a full size wheel and tire inside the car, but as you said, it's personal preference.
Just curious what sort of beyond repair punctures you're dealing with? If I can't fix a puncture with a plug, there's a really good chance that the rim is bent, and I rarely have seen one rim bent without the one in front/behind it also being destroyed, and I have yet to encounter a car with two spares. Some of you worry too much... |
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01-30-2013, 11:35 AM | #14 | |
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01-30-2013, 11:39 AM | #15 | |
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Just google SUBARU, AWD, and DONUT. |
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01-30-2013, 11:42 AM | #16 | |
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This means that if you got a flat on the rear of any X1, s or x drive and you have a compact spare, your best bet would be to remove a front wheel, place the donut on the front and the replace the flat rear wheel with the full size front. Even if you have staggered wheels, this will be preferable to just slapping the donut on the back. Just to continue to needle, you could also just plug the flat and drive on until the nearest tire repair place where you should really get a patch installed. |
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01-30-2013, 11:43 AM | #17 |
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That doesn't mean that the have an LSD, which aside from the STI, I'm reasonably certain no Subie does.
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01-30-2013, 11:44 AM | #18 | |
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Besides I can not expect her to patch the tire with the kit. AAA offers two options - towing or spare tire. Both times they installed the spare. So it worked quite well. |
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01-30-2013, 11:53 AM | #19 | ||
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01-30-2013, 11:57 AM | #20 | |
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Since this is also my wife's car, as was the 135i without RFT's, her solution would just be to call BMW roadside and wait for the tow truck to materialize. Of course she has been taught to request a tow to the nearest Discount Tire, not the dealer, which AAA is just fine with, since they're who actually answers when you call BMW Roadside. |
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01-30-2013, 12:01 PM | #21 |
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WIFE!!! This is why I choose to carry the donut. We have both BMW Assist and AAA. My wife is a physician and works late nights at times. I won't put her at risk of having to ride with the tow truck driver. When we did have her 128i towed due to a failure of the RFT (so no donut), I went and picked her up.
BMW assist will only tow to a dealership...not America's Tire or home. |
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01-30-2013, 12:04 PM | #22 | |
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As for going to pick your wife up with a flat RFT, was she more than 50 miles from home? That is sort of the point of RFT's, for just the situation you described. |
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