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      08-13-2019, 11:09 PM   #1
iManu
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Launch control broke tab and rear right drive shaft

Hello, I have a x3m40i, in posting here since there's more 340i than x3.

I got new tires, Michelin 4s and now when I launch my car around 3000rpm, I get zero wheel spin.

After a few launches, I heard a clunk noise and then found out that I had a broken left rear suspension tab and the rear right drive shaft was torn.

Anyone ever break any parts by using launch control on a modded or stock car?

Should this be covered under warranty?

I run 265 in the rear and 255 in front.
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      08-14-2019, 06:37 AM   #2
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On a stock car, yes.

But the tune and wider/stickier tires can technically void the warranty on drivetrain stuff. You're putting more wear on the transmission, axles, etc. By mounting wider and stickier tires. Sometimes wheel spin is protecting your car even if the performance suffers a bit.

If you have a good relationship with your dealer, then they may cover it.
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      08-14-2019, 07:23 AM   #3
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can i ask other than the 'clunk' what residual symptoms did you see/hear?
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      08-14-2019, 09:23 AM   #4
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Quote:
Originally Posted by Bawbag568 View Post
can i ask other than the 'clunk' what residual symptoms did you see/hear?
Broken tab upper left tab, car changing lanes by itself at speeds over 55mph every time I went on a bump on the highway, vibration rear right upon acceleration.
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      08-14-2019, 11:28 AM   #5
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Sorry to hear.

What tune you running? Now I'm a bit worried to launch my car since I have the same car and am tuned.
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      08-14-2019, 09:29 PM   #6
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I'm sure it's because of his tire setup. I wouldn't worry about the tune doing this.
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      08-15-2019, 08:26 AM   #7
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Quote:
Originally Posted by j1980mac View Post
I'm sure it's because of his tire setup. I wouldn't worry about the tune doing this.
So my tires can brake my drive shaft and tabs because they're too sticky? Should I go back to maybe the Michelin pilot 4 suv like the new x3m size or maybe the bridge stones?
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      08-15-2019, 08:50 AM   #8
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Quote:
Originally Posted by iManu View Post
Quote:
Originally Posted by j1980mac View Post
I'm sure it's because of his tire setup. I wouldn't worry about the tune doing this.
So my tires can brake my drive shaft and tabs because they're too sticky? Should I go back to maybe the Michelin pilot 4 suv like the new x3m size or maybe the bridge stones?
No, really doesn't matter what rubber you have. I have the PS4S (20s) on the BM3 Stage 2 93. Just stick with the OEM sizes and you'll be fine.

Launch control is hard on any vehicle just FYI.
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      08-15-2019, 08:56 AM   #9
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Quote:
Originally Posted by j1980mac View Post
Quote:
Originally Posted by iManu View Post
Quote:
Originally Posted by j1980mac View Post
I'm sure it's because of his tire setup. I wouldn't worry about the tune doing this.
So my tires can brake my drive shaft and tabs because they're too sticky? Should I go back to maybe the Michelin pilot 4 suv like the new x3m size or maybe the bridge stones?
No, really doesn't matter what rubber you have. I have the PS4S (20s) on the BM3 Stage 2 93. Just stick with the OEM sizes and you'll be fine.

Launch control is hard on any vehicle just FYI.
Doesn't the difference in size affect the transfer case and not the drive shaft? Let me know. I'm around at 0.9% in difference. I heard that the size tolerance is 1%.
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      08-15-2019, 09:36 AM   #10
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The tune is certainly calling for more TQ than the stock tune and bigger tires are just moving the forces from tire slipage to axels and suspension components. The dealer will surely check for computer tampering just as a matter of bringing it in for service. I had a battery die in my combox and they reflashed my DME because it was running an unauthorized image. I didn't dream in a million years they would that for a COMBOX error but they did. I had to pay to get it reflashed (pre bootmod3 years)
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      08-20-2019, 11:26 AM   #11
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Quote:
Originally Posted by iManu View Post
Hello, I have a x3m40i, in posting here since there's more 340i than x3.

I got new tires, Michelin 4s and now when I launch my car around 3000rpm, I get zero wheel spin.

After a few launches, I heard a clunk noise and then found out that I had a broken left rear suspension tab and the rear right drive shaft was torn.

Anyone ever break any parts by using launch control on a modded or stock car?

Should this be covered under warranty?

I run 265 in the rear and 255 in front.

Any update on this?

Also my car never goes above 2600-2700 ever with or without tune, sounds like the tune is exceeding acceptable load levels at launch
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      08-20-2019, 12:05 PM   #12
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Both issue has been covered, bmw told me if it happens too often, it will not be covered because they're drive shafts and tabs aren't meant to break like this.
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      08-20-2019, 10:23 PM   #13
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Quote:
Originally Posted by iManu View Post
Both issue has been covered, bmw told me if it happens too often, it will not be covered because they're drive shafts and tabs aren't meant to break like this.
Very nice, are you going to ask tuner to tone down the launch control or just not use it as much?
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      08-21-2019, 06:54 AM   #14
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BMWs are becoming very fragile and that's an X car which should have beefier drivetrain components.

Porsche launch control launches at 5000 rpm with no problems.

Definitely more grip put more stress on the drivetrain but it should be able to launch without damage.

As for tyres it's no problem X3 come with optional 275 at the back OEM.

If you are not tuned definitely go give it a try sometimes it works though they will tell you the user manual says using launch control could damage the drivetrain.

As for warranty it depends how many times you used launch control.

Quote:
Originally Posted by iManu View Post
Hello, I have a x3m40i, in posting here since there's more 340i than x3.

I got new tires, Michelin 4s and now when I launch my car around 3000rpm, I get zero wheel spin.

After a few launches, I heard a clunk noise and then found out that I had a broken left rear suspension tab and the rear right drive shaft was torn.

Anyone ever break any parts by using launch control on a modded or stock car?

Should this be covered under warranty?

I run 265 in the rear and 255 in front.

Last edited by IMS-340C; 08-21-2019 at 07:17 AM..
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      08-21-2019, 07:00 AM   #15
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In this case I am glad my car has massive wheel spin when I use launch control

Quote:
Originally Posted by kern417 View Post
Sometimes wheel spin is protecting your car even if the performance suffers a bit.
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      08-21-2019, 10:12 PM   #16
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Quote:
Originally Posted by IMS-340MP View Post
BMWs are becoming very fragile and that's an X car which should have beefier drivetrain components.

Porsche launch control launches at 5000 rpm with no problems.
I wasn't aware an M Performance car would be comparable to a Porsche.

It is, after all, an X3 M40i - not an M car.
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      08-22-2019, 04:49 AM   #17
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I am not comparing them in terms of performance or cornering ability, I am comparing them in terms of build quality.

Sports car are more fragile than normal cars so definitely the X3 should be more reliable than a Porsche.

Also this is an X car is built tougher even with some off-road abilities and with all wheel drive their drive shafts should handle a lot of stress.


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Originally Posted by Jahjaman View Post
I wasn't aware an M Performance car would be comparable to a Porsche.

It is, after all, an X3 M40i - not an M car.
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      08-25-2019, 04:09 PM   #18
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Quote:
Originally Posted by Jahjaman View Post
Quote:
Originally Posted by IMS-340MP View Post
BMWs are becoming very fragile and that's an X car which should have beefier drivetrain components.

Porsche launch control launches at 5000 rpm with no problems.
I wasn't aware an M Performance car would be comparable to a Porsche.

It is, after all, an X3 M40i - not an M car.
For not being an "M" I've ran side by side with a Porsche 911 4S Carrera at unmentionable speeds.
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      08-26-2019, 05:59 AM   #19
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Definitely the Porsche was not pushing, my 340 MPPSK destroys the X3 M40i and for sure I can't keep up with a Carrera 4S, these cars are on another level.

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Originally Posted by j1980mac View Post
For not being an "M" I've ran side by side with a Porsche 911 4S Carrera at unmentionable speeds.
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      08-26-2019, 06:37 AM   #20
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Quote:
Originally Posted by IMS-340MP View Post
Definitely the Porsche was not pushing, my 340 MPPSK destroys the X3 M40i and for sure I can't keep up with a Carrera 4S, these cars are on another level.

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Originally Posted by j1980mac View Post
For not being an "M" I've ran side by side with a Porsche 911 4S Carrera at unmentionable speeds.
I'm talking a 2015-2018 4S. We did 2 pulls. We were side by side until he let off. He couldn't pass me.

I'm on BM3 Stage 2 93. He may have been bone stock, idk.
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      08-26-2019, 03:03 PM   #21
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Quote:
Originally Posted by j1980mac View Post
I'm talking a 2015-2018 4S. We did 2 pulls. We were side by side until he let off. He couldn't pass me.

I'm on BM3 Stage 2 93. He may have been bone stock, idk.
Good to know 😈

Did you ever get to the track?
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