10-08-2018, 09:56 PM | #1 |
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F90 automatic gearbox concerns
Hi guys,
I’m looking at F90 as my possible upgrade car candidate from the F80 and I love the car even more now that the new 3-series has been announced. I’ve heard that the engine internals have been upgraded and that the new 4.4 V8 is now more reliable, but what about the gearbox? It’s the standard ZF automatic? Seems like an achiles heel of the car. Taking into account the amount of torque it should handle even on a stock car. Thanks for your input. |
10-08-2018, 10:12 PM | #2 |
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10-09-2018, 01:11 PM | #3 |
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Zero issues... and a layman who isnt a DCT purist fan boy wont even know the difference in the real world. BMW has done a great job with the electronics that allow this ZF to perform like it does. The ZF can easily handle more tq than the DCT and TCU does a great job transferring driver input to the shifts up and down.
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10-09-2018, 06:26 PM | #4 |
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How about the delay in manual shifting when using paddles? Some people are complaining about that. P.S. not a fanboy of the DCT, but coming from an M3 with a manual transmission.
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10-09-2018, 06:35 PM | #5 | |
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Every single M3/M4 I owned was MT and it's the best thing ever. So much more engaging and fun to drive. Some sacrifices needs to be made and I am ok with M5.... I love this car. Now I heard that new M3 is coming with MT and might come with optional AWD. If I can get AWD and manual I will drop the M5 like a hot potato. Lol
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10-09-2018, 07:36 PM | #6 | |
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If there is a perceptible lag- thats covered in the tq and hp curves that are so flat and so early in the F90's range.
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10-10-2018, 08:22 AM | #8 | |
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EG: cruising in gear 7-8 in D3 and you want all of sudden want to take over a slower car. You could feel a very slight hesitation if you are slow on the throttle and you are relying solely on the TCU's aggressiveness or lack of it because of D3 is automated. Its a non material issue for me... I call it acceleration lag vs driver input lag.
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10-10-2018, 08:40 AM | #9 | |
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10-10-2018, 09:01 AM | #10 |
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In D3 from a dig? Im not finding them to be rough but its subjective. It might be just a bit more aggressive than the RS7 tuned but the hardware of the ZF basically the same with 1 more gear. It might be a software thing. For me its pretty fluid but I just sold an E63S (2018) and that thing was indeed rough and angry so to speak.
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10-10-2018, 11:26 AM | #11 | |
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10-10-2018, 11:47 AM | #12 | |
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10-10-2018, 01:16 PM | #13 |
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Do our cars have adaptable tcu's? If so the test drive car was on a fresh reset and if you even drive your car mellow just a bit, it will adapt to your style. Just typing out loud and trying to see if there is a reason to your statement.
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10-11-2018, 08:30 PM | #14 |
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Thank you all for sharing your thoughts on this matter. I guess i’ll need to test drive it somehow to get a feeling, but not easy to find a dealer that gives out these cars for test drive. The perfect transmission for me is still a manual and it is the best choice for a weekend fun car which an M car should be. But if it’s a daily and in modern traffic reality we have to make compromise, so I guess on this M5 the compromise is even more towards the comfort, rather than a hard shifting race car as E60 M5 used to be. The best automatic I have driven was a 911 GT3 with a PDK, but it does not have 4 doors and seats with massage of course. 😆
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10-11-2018, 08:43 PM | #15 | |
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Do you have proof of the internals (rods) being upgraded in the F90 and some pics side by side? Why would the ZF be an issue? If anything the DCT was an issue in the F10 M5 as it needed upgrading when running moderately more boost.... |
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10-29-2018, 12:38 AM | #16 |
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What does TCU stand for and how do you do a fresh reset?
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10-29-2018, 10:58 AM | #18 |
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Transmission Control Unit... basically the ecu for the Transmission.
No idea how to fresh reset it.
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10-29-2018, 11:22 AM | #19 |
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10-29-2018, 11:54 AM | #20 |
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10-29-2018, 04:13 PM | #22 | |
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Also, the more crazy powerful cars like the Koenigsegg now come with torque converters, as no clutch system is able to handle 1000 lbft of torque. So one dares to say that the old TC is the future of automatic sport shifting.
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