05-12-2014, 05:42 PM | #46 | |
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05-12-2014, 06:06 PM | #47 |
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I currently have a DCT and a 8ZF and they feel very different. Don't get me wrong , the ZF is a great transmission but it is not the same as a DCT. In light all around driving the 8ZF fits the bill but in aggressive driving the control and feel of the DCT is very apparent.
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05-12-2014, 06:16 PM | #48 | |
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So, even the Mercedes MCT, for example, which does not have a torque converter, is still at a disadvantage vs. a DCT. Same issue with the Aston Martin gearbox which, unlike the Mercedes, uses a stepped gear train just like a DCT or manual. |
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05-12-2014, 06:28 PM | #49 | |
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05-12-2014, 06:54 PM | #52 |
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05-12-2014, 07:13 PM | #53 |
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Theoretically. But - and I'm no expert either mind you - I don't think they can overlap the gear engagement can they? I guess it depends on how the friction bands are actuated.
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05-12-2014, 07:45 PM | #54 |
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I think this video answers all questions
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05-13-2014, 12:19 AM | #56 |
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Great vid! My next car will have one.
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05-17-2014, 11:10 PM | #57 |
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>> One thing that hasn't been pointed out is that DCT's tend to have lower torque/HP ratings.
The stock 7-speed M-DCT is rated to 540 Nm. |
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05-17-2014, 11:17 PM | #58 | |
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I thought I read somewhere that the DCT can go up to 600NM.
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05-18-2014, 02:46 PM | #59 | |
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05-25-2014, 02:56 AM | #60 | |
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05-25-2014, 11:18 AM | #61 | |
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In ///M cars, the DCT will not downshift or upshift unless you ask it to with the paddles or the lever. It will bump on rev limiter without upshifting and will stay in the selected gear even if you floor the throttle all the way. One cool feature in manual mode, if you simultaneously floor the throttle to engage the "kickdown" and pull and hold the left paddle, the DCT will automatically downshift the required quantity of gears (skipping gears) to get you optimal acceleration. |
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05-25-2014, 12:35 PM | #62 | ||
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Is it possible to program the ZF8 to behave like the DCT? As in no downshift when going past kickdown and no upshift when reaching the redline
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05-26-2014, 07:19 PM | #63 |
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06-09-2014, 10:19 PM | #64 |
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Although at the typical testing resolution of a Vbox, or the equipment used by journalists, the power flow appears full uninterrupted. However, if one were to look at the curves with a much higher sampling rate (and appropriate filtering), one would see that shifts are ever so slightly interrupted, it is just about an order of magnitude less time than it takes to shift a MT. Any reasonably sensitive butt-o-meter can note this sensation and interruption.
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06-10-2014, 05:45 AM | #65 | |
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06-11-2014, 12:15 AM | #66 | |
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Look, don't get me wrong, I am a HUGE DCT fan, of both the engineering and driver experience. The shifts in my car are impressively fast, but they do vary in swiftness and feel substantially depending on mode and throttle position. Although in general they are nearly seamless, my butt-o-meter nearly always tells me when shifts happen.
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