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      09-26-2020, 09:32 PM   #23
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Quote:
Originally Posted by debdoub View Post
Quote:
Originally Posted by RJC-1 View Post
Many marques/vehicles offer larger wheels and tires as a factory option and there's no changes to beef up driveline components. He also wasn't tracking the car just driving 40-50 mph according to the OP. If I were the OP I would insist BMW to put something in writing explaining the exact reason the spring/s caused their driveline part to disintegrate at 40-50 mph of normal driving. I would then send that to HR for their take.

EDIT: I have been very vocal here nd on other forums to avoid modifications without prior blessings...
EDIT: I have been very vocal here nd on other forums to avoid modifications without prior blessings...

Nailed it ⬆️⬆️⬆️
I think we all have especially engine mods like flash tunes.

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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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Originally Posted by RJC-1 View Post
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.
My m8 has 14000 miles and its been bullet proof. I highly doubt a car starting at $140k is cost cutting.

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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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Quote:
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My m8 has 14000 miles and its been bullet proof. I highly doubt a car starting at $140k is cost cutting.

Noushy
When BMW's new CEO came in (before covid was even a big deal) he made cost cutting across the line a top priority, and the price of the vehicle can be totally irrelevant when it comes to cost cutting. Cutting costs like not having a passenger side dimming mirrors on $140k cars!!!, no longer covering brakes, wipers, and batteries in the standard warranty, cost cutting where they might have previously looked the other way if mild mods like larger tires were done and still cover them (hence the reference in this thread), salaries, R&D, development times, sharing components from lesser models in their more expensive models, flagships etc etc etc.

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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Last edited by RJC-1; 09-27-2020 at 12:19 AM..
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      09-27-2020, 01:28 PM   #28
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Quote:
Originally Posted by noushy View Post
My m8 has 14000 miles and its been bullet proof. I highly doubt a car starting at $140k is cost cutting.

Noushy

after 1 year drops half price
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      09-27-2020, 01:33 PM   #29
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Quote:
Originally Posted by sollomon View Post
Quote:
Originally Posted by noushy View Post
My m8 has 14000 miles and its been bullet proof. I highly doubt a car starting at $140k is cost cutting.

Noushy

after 1 year drops half price
Sadly true for most high end cars. You want resale buy a Prius or model 3. AMG GT does the same thing... Porsche is better, Audi worse

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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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Quote:
Originally Posted by noushy View Post
Quote:
Originally Posted by debdoub View Post
Quote:
Originally Posted by RJC-1 View Post
Many marques/vehicles offer larger wheels and tires as a factory option and there's no changes to beef up driveline components. He also wasn't tracking the car just driving 40-50 mph according to the OP. If I were the OP I would insist BMW to put something in writing explaining the exact reason the spring/s caused their driveline part to disintegrate at 40-50 mph of normal driving. I would then send that to HR for their take.

EDIT: I have been very vocal here nd on other forums to avoid modifications without prior blessings...
EDIT: I have been very vocal here nd on other forums to avoid modifications without prior blessings...

Nailed it
I think we all have especially engine mods like flash tunes.

Noushy
Engine mods can be dangerous, but flash mods or strap on chips are "safer" than mechanical lowering springs.
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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Quote:
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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.
Yep, ^this^
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      09-29-2020, 02:30 PM   #34
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Quote:
Originally Posted by ukr View Post
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.
Below is part of the email I sent to my buddy at BMW Bellevue before I made the change

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, 02:34 PM   #35
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Your bigger problem is if it gets fixed one way or another, will it happen again.
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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.
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      09-29-2020, 08:58 PM   #37
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Quote:
Originally Posted by cfm56d7b View Post
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.
This obsession with slamming vehicles and overall wide tires makes no sense. I have never had an issue with HRE or M Performance wheels. As for changing springs not sure why as the M8 is already fairly firm for a GT.

Noushy
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      09-29-2020, 09:34 PM   #38
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Quote:
Originally Posted by noushy View Post
Quote:
Originally Posted by cfm56d7b View Post
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.
This obsession with slamming vehicles and overall wide tires makes no sense. I have never had an issue with HRE or M Performance wheels. As for changing springs not sure why as the M8 is already fairly firm for a GT.

Noushy
Power to traction and because it looks crap; pigeon-toed (spacer/offset issue)... and not to my taste.

/Dean
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      09-29-2020, 09:37 PM   #39
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Quote:
Originally Posted by limeypride View Post
Quote:
Originally Posted by noushy View Post
Quote:
Originally Posted by cfm56d7b View Post
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.
This obsession with slamming vehicles and overall wide tires makes no sense. I have never had an issue with HRE or M Performance wheels. As for changing springs not sure why as the M8 is already fairly firm for a GT.

Noushy
Because it looks crap; pigeon-toed (spacer/offset issue)... and not to my taste.

/Dean
But is it worth the risk of suspension and or drivetrain damage?

Noushy
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      09-29-2020, 09:39 PM   #40
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Quote:
Originally Posted by noushy View Post
Quote:
Originally Posted by limeypride View Post
Quote:
Originally Posted by noushy View Post
Quote:
Originally Posted by cfm56d7b View Post
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.
This obsession with slamming vehicles and overall wide tires makes no sense. I have never had an issue with HRE or M Performance wheels. As for changing springs not sure why as the M8 is already fairly firm for a GT.

Noushy
Because it looks crap; pigeon-toed (spacer/offset issue)... and not to my taste.

/Dean
But is it worth the risk of suspension and or drivetrain damage?

Noushy
Subjective. To me, yes.
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      09-29-2020, 09:40 PM   #41
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Quote:
Originally Posted by limeypride View Post
Quote:
Originally Posted by noushy View Post
Quote:
Originally Posted by limeypride View Post
Quote:
Originally Posted by noushy View Post
Quote:
Originally Posted by cfm56d7b View Post
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.
This obsession with slamming vehicles and overall wide tires makes no sense. I have never had an issue with HRE or M Performance wheels. As for changing springs not sure why as the M8 is already fairly firm for a GT.

Noushy
Because it looks crap; pigeon-toed (spacer/offset issue)... and not to my taste.

/Dean
But is it worth the risk of suspension and or drivetrain damage?

Noushy
Subjective. To me, yes.
Limey I got you but this was more to the OP and his wrecked car. I think you are more cautious about your mods.

Noushy
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      09-29-2020, 11:18 PM   #42
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Quote:
Originally Posted by noushy View Post
This obsession with slamming vehicles and overall wide tires makes no sense. I have never had an issue with HRE or M Performance wheels. As for changing springs not sure why as the M8 is already fairly firm for a GT.

Noushy
Agreed 110%. This isn't 1998 when the cars had 6 inches of wheel gap. No M cars made in the last 15 years look remotely high. Not only that, these people might be getting like 1% better handling versus stock (in other words, they likely don't even notice the difference) considering the stock suspension is already great. I swear people just do this to say they "modded" their car and basically burn money.....makes no sense.

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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