|
|
07-23-2008, 05:42 PM | #1 |
the original brown guy
116
Rep 1,011
Posts
Drives: '22 MBB/SO X5M Comp
Join Date: Jan 2008
Location: NJ/NYC
|
Shifting into neutral with DCT!!! help!!
Ok, so a lot of people have been telling me that shifting from gear to neutral(to coast down a hill and save some gas) is bad for the DCT tranny and it will cause damage.
Is this true? Is it safe to switch from gear to neutral while driving? should i avoid switching while driving? help me out!!!! thanks |
07-28-2008, 12:34 PM | #2 |
Moderator
96
Rep 1,920
Posts |
If the owners manual does not warn against it, I would venture to say it would be ok for the tranny. However, it seems rather pointless to do such a thing IMHO, plus, you loose a bit of "control" over the car with it in neutral. I wouldn't bother with it personally, but to each his own I guess.
__________________
Tim <--- apparently likes "3" cars
2014 E63S -- The Rocket 2014 F30 328i -- Kids car 2008 E90 M3 -- Sold 2004 GT3 -- Sold 1997 M3/4 -- Sold 1995 M3 -- Sold |
Appreciate
0
|
07-28-2008, 04:20 PM | #4 |
Major General
152
Rep 5,124
Posts |
you should definitely avoid doing this while driving. no offense, but this is just as stupid as when people with automatic transmissions shift their car into neutral when going down a hill or something. you will lose power (thus, traction) to the tires, and the gas that you save will be very very very very very negligible. gas is not that expensive that anyone should be doing this.
|
Appreciate
0
|
07-28-2008, 07:31 PM | #7 |
Moderator
675
Rep 4,737
Posts |
jeremy clarkson actually said that leaving it in gear actually saves gas... since the momentum of the car is pulling on the engine instead of only using gas to maintain idle
plus NOT safe to drive in N |
Appreciate
0
|
07-29-2008, 03:19 PM | #8 |
the original brown guy
116
Rep 1,011
Posts
Drives: '22 MBB/SO X5M Comp
Join Date: Jan 2008
Location: NJ/NYC
|
oh thats cool
i mean i can afford the gas i was just curious if what people said was true anyways, thanks guys |
Appreciate
0
|
07-30-2008, 01:18 PM | #9 |
'Ringer
3
Rep 105
Posts |
Also, when you completely take your foot off the accelerator, the car is no longer spraying fuel into the engine. It has been this way on our ECU's since the e36 I think.
|
Appreciate
0
|
08-05-2008, 10:56 PM | #10 |
Major
92
Rep 1,465
Posts |
I found this interesting. I drove the DCT the other day, very impressed, but when I was coming to a stop I did put it into neutral and the car either stalled or shut itself off. I spoke to someone who delivered one and it did the same thing. Is this normal or a fluke?
|
Appreciate
0
|
08-05-2008, 11:08 PM | #11 |
Major
72
Rep 1,324
Posts |
From what I understand, the car is better off in gear than neutral when coasting. When in neutral, the engine has to keep fuel injection going to prevent stalling, but if the car is in gear coasting, the wheels and the drivetrain keep the pistons moving, and supposedly the car is smart enough to not bother with fuel ignition.
I dunno if it's correct, but it sounded plausible. Besides, it's better to have control over your car for that 1 in a million time you need it.
__________________
Was: 2008 335xi sedan 6MT Black Sapphire Metallic
Is: 2014 Tesla P85D (Blue Metallic) Wife's: 2013 Infiniti G37 S sedan 6MT, Black |
Appreciate
0
|
08-05-2008, 11:18 PM | #12 | |
Brigadier General
127
Rep 3,071
Posts
Drives: E92M3-E46M3-E46Wagon-E89Z4-E36
Join Date: Dec 2006
Location: Greater St Louis Metro area
|
Quote:
__________________
Invest Wisely...The best mod for your money?? BMWCCA high performance driver's school. The mod that lasts a lifetime and improves the performance of any car you drive[/LEFT]
|
|
Appreciate
0
|
08-05-2008, 11:24 PM | #13 |
Major
102
Rep 1,035
Posts |
What?
__________________
|
Appreciate
0
|
08-06-2008, 05:08 PM | #14 |
salivator
38
Rep 539
Posts |
Huh? That doesnt make sense to me. If you are on a completely plane surface, and your car is in gear, and you let of the brake w/o apllying the gas, the car will go. You could do this for miles right. But you are using gas. You are using gas when your car is in nuetral and idling.
|
Appreciate
0
|
08-06-2008, 05:39 PM | #15 | |
Brigadier General
127
Rep 3,071
Posts
Drives: E92M3-E46M3-E46Wagon-E89Z4-E36
Join Date: Dec 2006
Location: Greater St Louis Metro area
|
Quote:
1. What is a plane surface? Is that like a wing or fuselage or something? 2. What is letting of the brake? If you mean letting off the brake, the car will not go with 6MT or DCT, nothing happens on a flat surface, you will remain stationary What this thread is referring to is when you are coasting to a stop or just slowing down with the car in gear, if your foot is not on the gas the engine shuts off the fuel to the engine, therefore you are not using any fuel at all. If you are slowing down and you put your car in neutral then the car must use gas to keep the car running at idle, thus using more fuel than if you leave it in gear.
__________________
Invest Wisely...The best mod for your money?? BMWCCA high performance driver's school. The mod that lasts a lifetime and improves the performance of any car you drive[/LEFT]
Last edited by skierman64; 08-06-2008 at 10:12 PM.. |
|
Appreciate
0
|
08-06-2008, 05:40 PM | #16 |
Banned
840
Rep 46,029
Posts |
being in neutral actually costs u more. while engaged in gear ur wheels spinning will keep the engine alive, otherwise the engine will need gas injected to stay alive
|
Appreciate
0
|
10-09-2008, 01:39 PM | #18 |
Major General
688
Rep 6,845
Posts
Drives: 2018 Audi RS5 coupe
Join Date: Jul 2008
Location: Reston, VA
|
i know someone who failed a driving test because he was coasting and put it in nuetral
the tester said if you suddenly needed to accelerate, you would have to engage a gear first then accelerate the time spent doing that could cause you to have an accident |
Appreciate
0
|
10-09-2008, 06:23 PM | #19 |
Captain
63
Rep 672
Posts
Drives: E92 M3, E30 M3, 1M, F10 M5
Join Date: Sep 2008
Location: Singapore & San Fransisco
|
Well I sometimes shift to N sometimes when I am coasting to a driveway packed with people, rev my car up to 8000rpm and scare some kids. Of course after that, I will shift back to 1st gear and drive off. hehee...
|
Appreciate
0
|
10-09-2008, 10:23 PM | #20 |
Lieutenant
12
Rep 523
Posts |
It's correct. If you're coasting down a hill in gear you will use less gas than if you were in neutral because the engine is just windmilling and no fuel is being injected until you depress the accelerator.
|
Appreciate
0
|
Post Reply |
Bookmarks |
|
|