09-26-2020, 09:32 PM | #23 | ||
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09-26-2020, 09:35 PM | #24 |
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BMW's new CEO has been very clear about slashing costs whenever and wherever they can...this is usually not very good for the customer, nor product loyalty.
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09-26-2020, 10:46 PM | #25 | |
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09-26-2020, 11:08 PM | #26 |
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My theory here is that because the rear tyres were quite a bit shorter than the front tyres the car thought that the rear tyres were spinning faster than what they actually were. This would mean the car would put more torque towards the front than normal which killed the (perhaps weak/faulty) front axle.
However I'd also say that I'd damned well expect the front axles to handle shock loads such as if they spin a little bit and regain grip on a dry road surface, the load there would be much higher than just driving normally with more power being sent to the front.
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09-26-2020, 11:19 PM | #27 | |
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And, he in fact did cut costs to the tune of $13,600,000,000.00 in 2019 and they were even planning on "drastic measures" beyond the $13.6B. https://www.bloomberg.com/news/artic...ale-car-demand https://www.cnbc.com/2019/03/20/bmw-...cost-cuts.html https://www.autoblog.com/2019/11/27/...-cost-cutting/
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09-27-2020, 01:33 PM | #29 | |
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09-28-2020, 09:46 AM | #30 |
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Not at all same cars; but I put H&R springs on my g37x and blew out the axle almost the exact same as you're describing.
I'm not saying that it's the problem, nor am I a mechanic; however, It's possible the H&R springs. |
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09-28-2020, 03:20 PM | #31 | |||
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You are far more likely to mess up the entire power train with wheels, spacers and lower springs [exactly like this OP]; than you are to blow a turbo with ECU boost [like OP said no tune]. and while it's far less likely to happen, even a blown turbo is a drivable fixable solution for half the price, of a whole new axle and drive train. where you can't even drive it and tow costs alone double the double price. |
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09-28-2020, 11:34 PM | #32 |
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Going with aftermarket wheels and different tire sizes is tricky on an all wheel drive car. You have to maintain OEM tire diameter ratio between front and back or your transfer case will be toast quickly.
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09-29-2020, 11:05 AM | #33 |
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09-29-2020, 02:30 PM | #34 | |
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STOCK ------- 275/35 = 86.6 285/35 = 87.5 ... front:rear circumference delta = 0.9" (rear is larger) ME --- 285/35 = 87.5 295/35 = 88.3 ... front:rear circumference delta = 0.8" (rear is larger) ... - 0.1" relative to stock He said BMW won't confirm whether my -0.1" circumference delta is supported or not but he felt it was within tolerance since it's actually closer to 1:1. @OP, here are your numbers. I don't understand the tolerances at play here--I'll leave that to the experts--but the difference is substantial enough to give me pause. I'm not sure if the reversal as to the larger circumference is significant. OP --- 285/35 = 87.5 305/30 = 85.4 ... front:rear circumference delta = 2.1" (front is larger) ... + 1.2" relative to stock |
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09-29-2020, 03:30 PM | #36 |
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This is a cautionary tale. BMW is taking a clear position on this matter and will not perform this repair under warranty. If pursued further, legal expenses will most certainly exceed $4500.
In the age of corporate cost cutting, all modifications will be scrutinized closely when repairs under warranty are being considered. There is only one practical option for OP. Fix the axle. Pay BMW. Return the vehicle to stock form until warranty expires. |
09-29-2020, 08:58 PM | #37 | |
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09-29-2020, 09:34 PM | #38 | ||
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09-29-2020, 09:37 PM | #39 | |||
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09-29-2020, 09:39 PM | #40 | ||||
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09-29-2020, 09:40 PM | #41 | |||||
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09-29-2020, 11:18 PM | #42 | |
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Lowering springs are pretty much moot technology at this point.... Wider tires I get.....but lowering springs I just don't.
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09-30-2020, 06:36 PM | #43 |
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Some time ago, I had asked my SA if adding wheel spacers would be a problem. He said probably not. However, should a problem occur. BMW would most likely deny the claim because the car was altered from stock.
By altering the drive train in any way, it gives BMW an excuse to deny the claim. Anytime you change anything in the drive train, your risking the warranty coverage on the drive train and all the related components.
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09-30-2020, 07:12 PM | #44 |
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Limey’s explanation for the larger front tires seems the most probable cause on an AWD system as it forces a slightly different rotational speed. 2” plus makes a difference especially as software plays a role (assume the M8 AWD is variable with torque vectoring).
Lowering springs would have more impact on the suspension components (arms/bushings). |
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