02-23-2018, 10:48 AM | #45 | |
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Interestingly, it does not seem to be a single axis transmissions, which would limit it's application. I wonder why ZF have done that.
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03-09-2018, 06:25 PM | #46 |
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You'll have to explain that to me, Porsche uses PDK (ZF) in its high torque (front engine) AWD applications.
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03-09-2018, 08:55 PM | #47 | |
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frankchn already pointed out in this thread that ZF does indeed make a new 8-speed DCT unit with a 1000N-m capability for the Panamera. As I pointed out though, this unit does not seem to be a single axis unit (input and output shafts on the same axis), which could be a reason why BMW decided not to use it.
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03-10-2018, 05:24 AM | #48 | |
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You said it didn't exist, hence my reply.
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03-10-2018, 05:30 AM | #49 | |
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But as I stated, the ZF 8-speed PDK does not seem to be a true longitudinal unit as the input and output shafts are not on the same axis.
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03-11-2018, 07:32 AM | #50 |
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Way back in the "good ole days", the most depressing thing to see on the left side of the trunk lid was "Automatic." Very few 2002s or Bavarias were purchased with automatics for very obvious reasons back then. Even more depressing was to run across a very rare 2800 or 3.0CS and see "that" emblem on the tail.
Perhaps BMW should revive the usage of 51-14-1-802-320! It's actually still a valid part number even. This way all can be proud of their G80 M3 with its torque converter automatic by having its existence displayed on the trunk lid.
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03-16-2018, 02:27 PM | #51 | |
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See CAYENNE.
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03-16-2018, 02:30 PM | #52 | |
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PDK is made by zf, there's no other car that I know of equipped with a similar zf dct.
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03-16-2018, 03:26 PM | #53 |
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Very good point.
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03-26-2018, 08:19 AM | #54 |
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Last Spring I was at Lime Rock Park while Turner Motorsports was testing their M235R race cars. I spoke to Will Turner and several other members of the team. They all said that they were very impressed with the transmission in the M235R (which is a ZF 8 Speed). They said it shifted quickly and smoothly and they were getting very good lap times.
I assume that the ZF in the M235R is programmed differently than it is in the regular street cars but I do not know this as a fact. I would also assume that if there is a ZF in the new M3/4 it will be programmed similarly to the M235R. On another note I have a DCT in my M4 and a ZF in my Jaguar. They are both very good transmissions. They shift quickly and smoothly. I have no issue with harshness of the DCT in traffic.
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04-06-2018, 12:24 PM | #55 |
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What M3 needs is higher max rpm with closer gear ratios. Screw torque.
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04-06-2018, 12:46 PM | #56 |
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I think the ratios are fine. 1st and 2nd already spin the tires. 3rd through 7th overlap if you shift at redline...
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04-06-2018, 12:53 PM | #57 |
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Final drive 3.462 (F82) vs 3.86 (E92) on 6MT. DCTs are fine.
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06-10-2018, 12:11 PM | #58 | ||
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I am highly impressed with the ZF. I would buy another car with it. |
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06-23-2018, 08:51 PM | #59 |
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06-24-2018, 07:45 AM | #60 |
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It is alright. ZF8AT however will not withstand rpm higher than 7,500rpm and practically bogs down starting 7,400 rpm.
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06-29-2018, 10:11 PM | #62 |
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Expect a much lower redline in the next M3 if they use the ZF or they're going to have to do some serious modifications to the transmission.
Here's a reference post about the F90 ZFHP75 by an employee. https://f90.bimmerpost.com/forums/sh...&postcount=161 |
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07-03-2018, 01:21 AM | #63 | |
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07-22-2018, 11:32 AM | #64 |
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07-22-2018, 12:25 PM | #65 |
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I don't. The gear ratios on the F8X DCT have not been optimized for the S55.
I think 1st, 2nd and 3rd should have been made longer and more tightly spaced. What is the point of having a 1st gear that is so short that it can barely put the power down and then have wheel torque fall off when you shift to 2nd.
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07-22-2018, 10:00 PM | #66 |
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Depends on how much torque it will have. The M-DCT could not handle the M5's torque it was putting out. It's also lighter. For the majority of M3 owners honestly, the DCT really isn't really needed.
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