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      10-15-2018, 07:57 AM   #23
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Quote:
Originally Posted by andrewc89 View Post
I'm no expert but based on everything I've read over the years and based on testimonials of others here, my understanding is that if you tune the car they flag it. If you then bring the car in for a related warranty repair they can deny the claim if they prove it was related. If I'm wrong then please fill me in.
THe big caveat to this is that it depends on the dealership.
The universal truth is that they COULD flag it.
Doesn't mean they WILL flag it.

For example, my Dinan tuned (flash) 135 went in with a transmission issue.
They replaced my manual transmission under CPO warranty, no questions asked, and they knew I had tuned the car because they were the ones who installed it.
In theory they could have put it on the tune and tried to make Dinan cover it, saying that the extra power is what was damaging the tranny, and I could have been stuck in a back-and-forth, but no - dealership just fixed it and didn't cost me a dime.
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      10-15-2018, 08:14 AM   #24
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Quote:
Originally Posted by Cavpilot2k View Post

THe big caveat to this is that it depends on the dealership.
The universal truth is that they COULD flag it.
Doesn't mean they WILL flag it.

For example, my Dinan tuned (flash) 135 went in with a transmission issue.
They replaced my manual transmission under CPO warranty, no questions asked, and they knew I had tuned the car because they were the ones who installed it.
In theory they could have put it on the tune and tried to make Dinan cover it, saying that the extra power is what was damaging the tranny, and I could have been stuck in a back-and-forth, but no - dealership just fixed it and didn't cost me a dime.
Pretty sure the flagging happens automatically when they hook it up to a diagnostic computer so It's completely out of the dealerships control.

I have a friend who went in with a M3CS transmission flash on his DCT M3 and it was auto flagged and now he's got no warranty on the tranny. Had nothing to do with the dealership, it was auto flagged by bmwag.

Also dinan is factory warrantied (or at least has a matching factory warranty) so in your case it really wouldn't matter. If you had any other brand of tune or flash the outcome of that may have been very different.
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      10-15-2018, 09:27 AM   #25
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Quote:
Originally Posted by andrewc89 View Post
Pretty sure the flagging happens automatically when they hook it up to a diagnostic computer so It's completely out of the dealerships control.

I have a friend who went in with a M3CS transmission flash on his DCT M3 and it was auto flagged and now he's got no warranty on the tranny. Had nothing to do with the dealership, it was auto flagged by bmwag.

Also dinan is factory warrantied (or at least has a matching factory warranty) so in your case it really wouldn't matter. If you had any other brand of tune or flash the outcome of that may have been very different.
Dinan is NOT factory warrantied. They simply offer a matching warranty in case BMW won't cover a related repair. Once upon a time they had a closer relationship and BMW gave Dinan the "keys" to unlock the DMEs, but that is no longer the case and hasn't been for several years.

Again, my car was flashed at the dealership, so there's no way "BMW" doesn't know my car is tuned. Now maybe they just said that the transmission is separate from, and unrelated to an engine flash, so there is no conflict, but I have heard of some dealerships (illegally, but who can fight them) voiding a car's entire warranty even for unrelated systems (like voiding a warranty for an aftermarket exhaust, which is not legal in the US).

So, I understand how the warranty voiding and flagging works in theory, but in my experience, it can be far less draconian than it is made out to be based on the dealership. YMMV, but I feel confident based on my case (a complete manual transmission replacement under warranty for a known tuned car) that there are workarounds.

But if it is a serious concern, you should have a serious talk with your service manager before making modifications and get a "no BS" answer from them.
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      10-15-2018, 09:43 PM   #26
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I think with the flash tunes you'd just flash back to stock before taking it in for service, apparently it is really fast. However if it blows up and they dig and find out it has had boost beyond the normal tune then you are screwed on the warranty.
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      10-16-2018, 02:12 AM   #27
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Quote:
Originally Posted by FSU_Logan View Post
Yes, all they could "flag" is drivetrain and if you really wanted, you could lawyer up and have them prove the tune was at fault... its typically a losing battle though, because of the obvious lawyer fees

All warranty work I've ever gotten on my cars (including a new motor and trans..) was after I severely modified them. I am straight up with my service advisors, though. I'll do the same with this car. Push comes to shove, building the motor is an option
Lucky you got the motor under warranty, must buy your SA some bottles for the holidays .

As always like you said, if you have the money to play then no big deal.
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      10-16-2018, 02:14 AM   #28
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Quote:
Originally Posted by andrewc89 View Post
Pretty sure the flagging happens automatically when they hook it up to a diagnostic computer so It's completely out of the dealerships control.

I have a friend who went in with a M3CS transmission flash on his DCT M3 and it was auto flagged and now he's got no warranty on the tranny. Had nothing to do with the dealership, it was auto flagged by bmwag.

Also dinan is factory warrantied (or at least has a matching factory warranty) so in your case it really wouldn't matter. If you had any other brand of tune or flash the outcome of that may have been very different.
Not sure about auto flagging, but in terms of actually getting a warranty replacement, I think it depends if they open a PUMA case and if a BMW NA field guy comes to look at it. If your dealership can convince BMW to just replace it without much investigation you'll be ok.
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      10-16-2018, 05:27 AM   #29
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Quote:
Originally Posted by chris719 View Post
Not sure about auto flagging, but in terms of actually getting a warranty replacement, I think it depends if they open a PUMA case and if a BMW NA field guy comes to look at it. If your dealership can convince BMW to just replace it without much investigation you'll be ok.
+1

Some dealerships I've seen do hook-up and get auto-flagged (few months ago M got flagged, owner had jb4 and there were hidden/ghost codes) my buddy works there had no idea.
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      10-16-2018, 08:36 AM   #30
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Quote:
Originally Posted by andrewc89 View Post
Pretty sure the flagging happens automatically when they hook it up to a diagnostic computer so It's completely out of the dealerships control.

I have a friend who went in with a M3CS transmission flash on his DCT M3 and it was auto flagged and now he's got no warranty on the tranny. Had nothing to do with the dealership, it was auto flagged by bmwag.

Also dinan is factory warrantied (or at least has a matching factory warranty) so in your case it really wouldn't matter. If you had any other brand of tune or flash the outcome of that may have been very different.
No that's not how it works. It might be discovered but if your tech and SA doesn't put it in the file it's not flagged.
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      10-16-2018, 09:54 AM   #31
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Quote:
Originally Posted by chris719 View Post
Lucky you got the motor under warranty, must buy your SA some bottles for the holidays .

As always like you said, if you have the money to play then no big deal.
I have purchased multiple cars from this dealership and send people their way. It was just the right thing to "do" lol. Hell, this same dealership warrantied a popped RS motor 3 times before Ford sent engineers out to see WTF was going on. lol
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      10-17-2018, 01:39 AM   #32
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Quote:
Originally Posted by andrewc89 View Post
Pretty sure the flagging happens automatically when they hook it up to a diagnostic computer so It's completely out of the dealerships control.

I have a friend who went in with a M3CS transmission flash on his DCT M3 and it was auto flagged and now he's got no warranty on the tranny. Had nothing to do with the dealership, it was auto flagged by bmwag.

Also dinan is factory warrantied (or at least has a matching factory warranty) so in your case it really wouldn't matter. If you had any other brand of tune or flash the outcome of that may have been very different.
There's a section in ISTA to "blacklist" a car from sending FASTA data up to BMW, can even do it in offline mode if the dealer technicians know what they're doing.

I've heard of some dealers not send FASTA data out by doing a "offline" read of the car.

It's up to dealer to determine if they want to flag it or not. Obviously if FASTA data is read, or if a BMW regional engineer comes out to check your car for a large warranty repair and they find evidence of modifications you will be flagged and warranty work denyed.

It's really a coin flip on the risk of having a tune and getting warranty work approved.

Being instantly warranty flagged is different, if a dealer really hates you they WILL do it.
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      10-18-2018, 01:59 AM   #33
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I'd have no trouble tuning this engine if there wasn't the spectre of a spun crank hub hanging over the S55. Gives me some pause because if BMW investigates, a tune is definitely a reason to deny warranty.
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      10-18-2018, 02:44 AM   #34
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Quote:
Originally Posted by chris719 View Post
I'd have no trouble tuning this engine if there wasn't the spectre of a spun crank hub hanging over the S55. Gives me some pause because if BMW investigates, a tune is definitely a reason to deny warranty.
Fraction of a percent, if that. Completely over blown. Yet to this day meet someone in person who has had the problem. Even with the endless amounts of bmwcca meets and trackdays I have attended. Not just S55 powered cars, N55 uses the exact same crank hub parts. Everything is forum only. Absolutely nothing compared to rod bearing issues of S54, S65, S85.

Last edited by hellrotm; 10-18-2018 at 02:57 AM..
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      10-18-2018, 05:18 AM   #35
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Fraction of a percent, if that. Completely over blown. Yet to this day meet someone in person who has had the problem. Even with the endless amounts of bmwcca meets and trackdays I have attended. Not just S55 powered cars, N55 uses the exact same crank hub parts. Everything is forum only. Absolutely nothing compared to rod bearing issues of S54, S65, S85.
Definitely agree it's not like the widespread S65 issues. Just a question of if you want to risk a $20k repair bill or whatever they charge for a new S55.

Still, despite the fact that the crank hub part is the same, it's possible there are additional vibrations or harmonics that make it worse in S55.

Not trying to overstate the risk, but it's non-zero.
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      10-18-2018, 03:36 PM   #36
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I'm wondering if any of the tuners will offer an ots CS tune BUT maintain the low end torque limitation on M2C S55... That could be an excellent combo for track use. I know the custom maps allow altering boost per gear but having the "BMW" CS tune coupled with the torque limit down low seems like a great combo.
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      10-18-2018, 04:14 PM   #37
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Originally Posted by Proctor750 View Post
I'm wondering if any of the tuners will offer an ots CS tune BUT maintain the low end torque limitation on M2C S55... That could be an excellent combo for track use. I know the custom maps allow altering boost per gear but having the "BMW" CS tune coupled with the torque limit down low seems like a great combo.
I personally would use the M4 CS map as it is without any modification but what you are asking for is already available from BM3 and the best part is you can adjust it yourself to your liking via their user interface before flashing the map:

*** Boost/Torque by Gear (% Reduction) - New Map Configuration option - bootmod3 ***
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      10-18-2018, 04:26 PM   #38
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Also it looks like there is a new complete/permanent fix for the crank hub:

New Crank Hub Solution to Market https://f80.bimmerpost.com/forums/sh....php?t=1546386


Last edited by M-Pilot; 10-18-2018 at 05:11 PM..
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      10-18-2018, 05:07 PM   #39
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Quote:
Originally Posted by chris719 View Post
Definitely agree it's not like the widespread S65 issues. Just a question of if you want to risk a $20k repair bill or whatever they charge for a new S55.

Still, despite the fact that the crank hub part is the same, it's possible there are additional vibrations or harmonics that make it worse in S55.

Not trying to overstate the risk, but it's non-zero.
I think* that some people with spun crank hub issue doesn't ruin their engine. So it may be possible to catch the issue before it's a 20k repair.
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      10-18-2018, 06:06 PM   #40
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The crank hub is why I'm considering Mechanical Breakdown Insurance through Geico. I understand it covers the motor even if modified.
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      10-18-2018, 11:18 PM   #41
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Quote:
Originally Posted by cntzl View Post
Also it looks like there is a new complete/permanent fix for the crank hub:

New Crank Hub Solution to Market https://f80.bimmerpost.com/forums/sh....php?t=1546386

+100

Quote:
Originally Posted by pz619 View Post
The crank hub is why I'm considering Mechanical Breakdown Insurance through Geico. I understand it covers the motor even if modified.
It does not cover if modified lol, FYI
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      10-19-2018, 02:28 AM   #42
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Quote:
Originally Posted by cntzl View Post
Also it looks like there is a new complete/permanent fix for the crank hub:

New Crank Hub Solution to Market https://f80.bimmerpost.com/forums/sh....php?t=1546386

Notice it is a fix for N54, N55, and S55. It is a weak point for high hp builds with all those motors. Built motor builds finally have a solution to push 700whp+ comfortably.
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      10-19-2018, 08:41 AM   #43
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Quote:
Originally Posted by cntzl View Post
Also it looks like there is a new complete/permanent fix for the crank hub:

New Crank Hub Solution to Market https://f80.bimmerpost.com/forums/sh....php?t=1546386

Dude - No way! That is exactly what I "envisioned" as a fix... Awesome news. 100% doing this (so long the claims are not bullshit but it logically makes sense).
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      10-19-2018, 10:39 AM   #44
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Quote:
Originally Posted by cntzl View Post
I personally would use the M4 CS map as it is without any modification but what you are asking for is already available from BM3 and the best part is you can adjust it yourself to your liking via their user interface before flashing the map:

*** Boost/Torque by Gear (% Reduction) - New Map Configuration option - bootmod3 ***
I was aware of the boost/torque by gear but it looks like that only is an option with their stage 1 etc. tunes vs something like the CS tune.

What is the difference between their stage 1 and an ots cs tune? (parameters not functionality)
My ideal setup would be the cs tune coupled with the ability to manipulate torque delivery. Sounds like it's doable.
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