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      03-22-2021, 11:04 AM   #45
Murf
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Originally Posted by somer View Post
Shift speeds really aren't the problem it's the paddle delay and momentary torque lapse that the ZF has.
All correctable in XHP.
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      03-22-2021, 11:18 AM   #46
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All correctable in XHP.
How does XHP work with BMW warranty of the transmission and the rest of the driveline? Any concerns here that BMW will make a fuss?
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      03-22-2021, 11:22 AM   #47
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How does XHP work with BMW warranty of the transmission and the rest of the driveline? Any concerns here that BMW will make a fuss?
My understanding is that the flash cannot be seen by BMW but not really sure. Can always flash back to stock before service.
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      03-22-2021, 11:24 AM   #48
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It will be interesting to see how many put the money where the mouth is and install XHP.
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      03-22-2021, 11:47 AM   #49
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Quote:
Originally Posted by solstice View Post
How does XHP work with BMW warranty of the transmission and the rest of the driveline? Any concerns here that BMW will make a fuss?
Flash XHP and BMW finds out... warranty is toast.

If it was safe for ZF8 emulate the "brutal" shifting characteristics of a DCT, they would have programmed it to do so from factory. Also, G8X ZF is likely going to be one of, if not, the most aggressive implementation of ZF yet - BMW has more at stake in living up to DCT than XHP does tuning an auto, so I would find it hard to believe that BMW would purposely keep the slight power reduction under load unless there is a very good reason for it.

Edit: woah that comes off almost kind of angry, not meant to be lol. Just providing another thought for the discussion
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      03-22-2021, 11:56 AM   #50
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Quote:
Originally Posted by Murf View Post
Quote:
Originally Posted by solstice View Post
How does XHP work with BMW warranty of the transmission and the rest of the driveline? Any concerns here that BMW will make a fuss?
My understanding is that the flash cannot be seen by BMW but not really sure. Can always flash back to stock before service.
If you really believe that, I have some Pacific Ocean beach front property in Utah I can sell you for very cheap... But seriously, considering BMW is cracking down harder on engine tuning, especially for the M cars (the F8x is a prime example), by "flagging" cars, they will most surely be able to tell if the transmission software has been altered. In fact, if a G8x AT were to come in with a transmission warranty claim, I am sure "CSI: BMW" would be in full effect looking at the transmission...

But for now, will BMW care? Maybe, if they see a lot of warranty claims/repairs regarding the AT transmissions - but it is still very early in the G8x life cycle of course. However, the 8HP AT family by ZF has a very stout performance and reliability record - it is used in almost all BMWs with AT now. So with any luck, the transmissions in the M cars will be able to take the future abuse of aftermarket transmission tunes without too much drama from BMW - at least until the warranty period is up, after which BMW won't care what happens.
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      03-25-2021, 02:26 AM   #51
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Quote:
Originally Posted by CklSpeciale View Post
I really like how the last-gen DCT feels, in a way which is quick and aggressive, especially the voilent part. I know the new ZF will be a great transmission, but to those of you who had chances driving a M5/M8, how does it compare to the old DCT? Are they equally fun?
I used to have F13 M6 with MDCT and now M8 with ZF8.
This ZF8 compare to ZF8 on F13 650i is much faster but not as fast and aggressive as MDCT on M6; however is not jerky like MDCT.
If I want to pick one definitely MDCT is my choice all day, but still happy with this ZF8.
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      06-17-2021, 03:50 PM   #52
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I'm not feeling the new automatic trans. I like the DCT on my F80. You guys like the new trans?
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      06-18-2021, 07:49 PM   #53
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Quote:
Originally Posted by WillyBeamin View Post
I'm not feeling the new automatic trans. I like the DCT on my F80. You guys like the new trans?
I do like it. Took me a little bit to get used to it (coming from an f80 zcp), but now I enjoy it a lot. Not as much low end torque of course, but much more "linear" for a lack of better term through all the gears. I also enjoy being able to put the car in park when I have to haha
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