05-16-2014, 08:26 AM | #1 |
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M-DCT Semantics and Subtleties
I've read the manual and searched and still have some questions about DCT operation:
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05-16-2014, 08:33 AM | #2 | |
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Edit: this is based on new DCT on M6. switching off the engine is a little tricky. you have to stay in gear and switch the ignition off. then it goes to "park" If you put the lever in "N" and then switch the ignition off, a message pops up to secure the car from rolling!
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05-16-2014, 08:33 AM | #3 | |
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Can you shift into neutral when the car is moving? On the E9X, holding the gearshift lever to the left would shift the DCT to neutral while moving, I expect the same on the F8X If yes, can you shift back into gear when the car is still moving? You could with the E9X by pushing the lever to the right, again, I expect the same with the F8X. When you start the engine, do you just hit the throttle to start moving? No, you need to put the transmission in gear Does it go automatically into "Park" when engine switched off? Yes. Can you keep it in neutral? No. To put the DCT in neutral with the engine stopped, you need to flick a special lever under the lever leather booth with a screw driver. Not sur how this will be on the F8X. What is the point of "Low Speed Assistant"? Manual says "briefly tap the accelerator pedal". The DCT does not behave as a regular automatic, it does not creep when the brake is released, it stays in neutral. You need to slightly dab the throttle to get the clutch to engage (slip) and creep forward. That is the "Low speed assistant". Last edited by CanAutM3; 05-16-2014 at 09:58 AM.. |
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05-16-2014, 09:31 AM | #5 |
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Think of DCT as a computer controller clutch and gearbox and you will be fine.
People get in trouble when they think DCT is an automatic transmission that you can use to change gears manually.
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05-16-2014, 09:55 AM | #6 |
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As it says, that is when the vehicle is stationary (for safety reasons). When in movement, just flick the lever to the right and it will go in gear.
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05-16-2014, 10:27 AM | #8 |
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05-16-2014, 11:17 AM | #9 | |
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(An automatic car wash is the example used) Note: P is engaged automatically: ▷ After the engine is switched off in ignition off, if position R or D is engaged. ▷ If the ignition is switched off and position N is engaged. Double-clutch transmission: 1. Drive into the car wash. 2. Engage transmission position N. 3. Switch the engine off (pressing the start/stop button while depressing the brake, switches off the engine but not the ignition). In this way, the ignition remains switched on, and a Check-Control message is displayed. Do not turn off the ignition in the car wash; otherwise, the transmission position P is engaged and damages can result.◀
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05-16-2014, 11:23 AM | #10 | |
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Thanks for pointing this out. Last edited by CanAutM3; 05-16-2014 at 06:10 PM.. |
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05-16-2014, 01:11 PM | #11 |
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Now I have a few DCT questions.
1. Is slow moving parking and switching between reverse and forward difficult, and are there any tips you can advise? 2. If driving and lightly tapping the throttle, does that case the clutch to slip? 3. I'm intrigued to understand what cause the DCT to change down gears when slowing down as against slipping the clutch? I can see I'll have problems when I test drive my F80 5 weeks today. Thanks
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05-16-2014, 02:09 PM | #12 | |||
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05-16-2014, 02:42 PM | #13 | |
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05-16-2014, 03:09 PM | #14 | |
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I have seen this in the M3 E90 manual page 68: System limitations The 7-gear Sport automatic transmission with double clutch has an overheating protection that protects the clutch from extreme loads. The indicator lamp lights up in yellow if the transmission becomes too warm. Avoid high engine loads and frequent accelerations from zero. If the transmission is overheated, the indicator lamp lights up in red and the power flow to the motor is interrupted. It is only possible to continue driving once the transmission has cooled down. Avoid frequent powerful accelerations from zero and do not hold the vehicle on inclines by pressing lightly on the accelerator while letting the clutch slip, as this may cause the transmission to overheat. ps, I've never owned an auto box before
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05-16-2014, 05:59 PM | #15 | |
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The excerpt from the manual is regarding numerous launches etc - I never experienced DCT overheating and I drove my car hard. Regarding holding the vehicle on inclines- there is no need to use the accelerator to hold the car on an incline - the car will hold itself for upto 2 seconds after the brake is released ( it will not roll back during that time) to allow you to move your foot from the brake to the accelerator . Once you touch the accelerator you will move of up the incline.
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05-16-2014, 06:13 PM | #16 | |
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BTW, DCT is not a "standard" autobox (slushbox). |
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05-16-2014, 06:19 PM | #17 |
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05-16-2014, 06:46 PM | #18 |
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Thanks for this thread, answering allot of my own concerns. I too am transitioning from a manual M3 to my first DCT for the M4 and am apprehensive.
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05-16-2014, 08:20 PM | #19 |
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Not so. You had asked about putting the car in P with the engine running. There is a park function, but it can only be engaged once the ignition is turned off (and it does so automatically when you do so).
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05-16-2014, 10:02 PM | #20 | |
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05-17-2014, 12:48 AM | #21 | |
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Here are the advanced notes
As others have said, I wouldn't get an M car without it - it's just too cool. I do miss a MT sometimes but like Joe Pike, you should always be moving forward. |
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05-17-2014, 02:24 AM | #22 |
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Good thread, I'd assumed it would behave like the 8 speed ZF auto, but the lack of creep is interesting at rest. Will need to be a little aware in the first weeks.
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