|
|
|
|
|
|
BMW Garage | BMW Meets | Register | Today's Posts | Search |
|
BMW 3-Series (E90 E92) Forum
>
Auto gearbox - neutral
|
|
05-08-2017, 08:15 AM | #1 |
Second Lieutenant
25
Rep 202
Posts |
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 |
05-09-2017, 06:43 AM | #2 |
Lieutenant Colonel
2690
Rep 1,977
Posts
Drives: 2020 M2C HS & Ferrari Roma
Join Date: Sep 2014
Location: Sydney, Australia
|
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
__________________
2020 M2 Competition | Hockenheim Silver | 437M Wheels / 763M Wheels | RHD | 2NH Brakes OEM M2 CS Steering Wheel | MP Carbon Steering Wheel Trim | MP Pedals | MP Dash | MP Interior Kit OEM M2 CS Bonnet | M Performance Coilovers | MP Rear Spoiler | MP Rear Diffuser| Perl Carbon Front Lip | Remus Race Exhaust |
Appreciate
0
|
05-14-2017, 10:24 PM | #3 |
First Lieutenant
11
Rep 344
Posts |
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.
__________________
Current: 2008 E90 335iA Sparkling Graphite Metallic Past: 2009 E90 LCI 323iA Black Sapphire Metallic, 2005 E46 325iA Black Sapphire Metallic, 1992 E34 535iA Glacier Blue BMW Driver's Club of South Australia member |
Appreciate
0
|
05-14-2017, 11:32 PM | #4 | |
Second Lieutenant
25
Rep 202
Posts |
Quote:
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. |
|
Appreciate
0
|
05-14-2017, 11:44 PM | #5 |
First Lieutenant
11
Rep 344
Posts |
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.
__________________
Current: 2008 E90 335iA Sparkling Graphite Metallic Past: 2009 E90 LCI 323iA Black Sapphire Metallic, 2005 E46 325iA Black Sapphire Metallic, 1992 E34 535iA Glacier Blue BMW Driver's Club of South Australia member |
Appreciate
0
|
05-15-2017, 02:33 AM | #6 | |
Lieutenant Colonel
2690
Rep 1,977
Posts
Drives: 2020 M2C HS & Ferrari Roma
Join Date: Sep 2014
Location: Sydney, Australia
|
Quote:
__________________
2020 M2 Competition | Hockenheim Silver | 437M Wheels / 763M Wheels | RHD | 2NH Brakes OEM M2 CS Steering Wheel | MP Carbon Steering Wheel Trim | MP Pedals | MP Dash | MP Interior Kit OEM M2 CS Bonnet | M Performance Coilovers | MP Rear Spoiler | MP Rear Diffuser| Perl Carbon Front Lip | Remus Race Exhaust |
|
Appreciate
0
|
05-15-2017, 07:24 AM | #7 |
Lieutenant Colonel
480
Rep 1,600
Posts |
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 |
Appreciate
0
|
05-15-2017, 08:28 PM | #9 |
Brigadier General
541
Rep 3,131
Posts
Drives: 2011 335i e92 DCT
Join Date: Sep 2015
Location: Australia, NSW
|
My DCT creeps also, but if it's on a hill it creeps for a second then goes backwards.
|
Appreciate
0
|
Bookmarks |
|
|