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      05-08-2017, 08:15 AM   #1
///ASN
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Auto gearbox - neutral

How many of you engaging N at a red light or when would you use N gear?
There are lots of different debates on the net as to whether N should be used in an automatic gearbox.
Some say N would help putting less pressure on the tranny at a traffic light, some say it is better to keep the fluid running in the torque converter by just depressing the brake with gear D (or S1/S2 engaged if manual mode), ect

And for DCT, my friend once told me that even if it is in gear D, unless the he presses the gas, otherwise the car will not go or even roll back when he lifts his foot off the brake on his Porsche with PDK.
I remember reading somewhere saying that there are 2 different tyres of DCT:
-car goes as soon as you release the brake
-you must need to press the gas in order for the car to go forward even in gear D
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      05-09-2017, 06:43 AM   #2
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Hm I don't believe any dual clutch unit moves as soon as you release the brake..

DSG/DCT/PDK all react in a similar way off the line

and no I never use N
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      05-14-2017, 10:24 PM   #3
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The engineers that design automatic transmissions put enough effort into the software to control everything that there is no need to put it in N at a stop.
I use N to park, put the handbrake on, release brake (let parking break take weight of car) then put in P.
On YouTube there is a video by Engineering Explained called "5 things never to do in an automatic transmission" and goes into a more technical explanation why. He also has another video about the DCT and your friend is half correct, due to design you shouldn't allow the car to 'creep' without throttle input. Whilst stationary it wouldn't matter though.
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      05-14-2017, 11:32 PM   #4
///ASN
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Quote:
Originally Posted by Testercles View Post
The engineers that design automatic transmissions put enough effort into the software to control everything that there is no need to put it in N at a stop.
I use N to park, put the handbrake on, release brake (let parking break take weight of car) then put in P.
On YouTube there is a video by Engineering Explained called "5 things never to do in an automatic transmission" and goes into a more technical explanation why. He also has another video about the DCT and your friend is half correct, due to design you shouldn't allow the car to 'creep' without throttle input. Whilst stationary it wouldn't matter though.
Make sense, sometimes I put in N, put the handbrake on, then engage P, especially when the car is on a slope.

Yes, i have watched quite a few videos from Engineering Explained, just not too sure if all info there is correct.

Re DCT, my friend says that even the car is stationary, a normal AT transmission, the car goes as soon as you release the brake, but some car with DCT will not unless you put throttle.
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      05-14-2017, 11:44 PM   #5
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Correct yeah, depending on design the DCT will be waiting around in N until it receives a throttle input and will then engage. Sorta manual-esque.
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      05-15-2017, 02:33 AM   #6
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Quote:
Originally Posted by ///ASN View Post
Make sense, sometimes I put in N, put the handbrake on, then engage P, especially when the car is on a slope.

Yes, i have watched quite a few videos from Engineering Explained, just not too sure if all info there is correct.

Re DCT, my friend says that even the car is stationary, a normal AT transmission, the car goes as soon as you release the brake, but some car with DCT will not unless you put throttle.
Plz ask him which dual clutch cars move forward on their own, I'm not stirring shit but I've yet to encounter a DCT gearbox move on its own accord with the release of the brake pedal.
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      05-15-2017, 07:24 AM   #7
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E9x M3 DCT will do nothing (as if you were in neutral or clutch pressed) unless you poke the gas pedal.

E8x/E9x non M DCT will creep at times without input once the hill holder lets go. In fact, it sometimes wants to lurch with your foot on the brake - when you select neutral or park you can feel the rear end relax
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      05-15-2017, 06:31 PM   #8
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My dct creeps.
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      05-15-2017, 08:28 PM   #9
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My DCT creeps also, but if it's on a hill it creeps for a second then goes backwards.
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