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 Car in stop by pressing brake while on gear "D"

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wayfeel
post Dec 29 2013, 12:04 AM

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QUOTE(DonMe @ Dec 29 2013, 12:00 AM)
Well I would do say it also depends on the atf used and the driving condition.
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Usually, assuming they send to honta and toyoda SC in the first few years of their car ownership, then it safe to say the atf is the right kind to use....so left the driving condition...

then that said....ur friends, you should know their driving condition...however not everyone is 'capable' of 'hard driving'....if they r not near the rough ppl kind...the GB should durable for normal use....

Then again, I would probably trust in Ferman Lao....hehe


wayfeel
post Dec 29 2013, 12:10 AM

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QUOTE(p*** LYF @ Dec 29 2013, 12:07 AM)
let's make stall test for your AT
apply brake pedal > shift in 'L,D' > Kick down accelerate pedal FULL
observe RMP reading. if above 2000rev, means slippage occur
Try it at home now
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When kick down acceleartion, how about the brake pedal, still hold or let go? biggrin.gif sry noob
kahjye
post Dec 29 2013, 12:14 AM

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guys.

i`ve a question

my car kinda shakes abit when i put on D and step on brake when waiting for the traffic light.

how to ease up the shakes eh?

new car do not shake at all when its in this situation smile.gif

my car is 6 years old btw.
wayfeel
post Dec 29 2013, 12:34 AM

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QUOTE(kahjye @ Dec 29 2013, 12:14 AM)
guys.

i`ve a question

my car kinda shakes abit when i put on D and step on brake when waiting for the traffic light.

how to ease up the shakes eh?

new car do not shake at all when its in this situation smile.gif

my car is 6 years old btw.
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when is the lastime u change your GB oil, did you check what mileage d? there's one more that cause vibration but i dont rmb what d....after all resort done, then check your engine mounting last, usually not the case for 'normal car'

What car btw



This post has been edited by wayfeel: Dec 29 2013, 12:36 AM
kahjye
post Dec 29 2013, 12:42 AM

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QUOTE(wayfeel @ Dec 29 2013, 12:34 AM)
when is the lastime u change your GB oil, did you check what mileage d? there's one more that cause vibration but i dont rmb what d....after all resort done, then check your engine mounting last, usually not the case for 'normal car'

What car btw
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hi.

thank you for your feedback.

i`ve changed my GB oil once last 15k km i think.

about engine mounting i think thats the problem

my car is honda accord 08.


hmm.gif
davidlow7
post Dec 29 2013, 03:08 AM

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One thing is when you guys decided to keep pressing on brake during a very long-stop.... Wasn't the shiny brake rear lamp is also shining at others' eye for a long period?

It's great that someone had posted to at least a link to an answer from the expert.

This post has been edited by davidlow7: Dec 29 2013, 03:08 AM
DonMe
post Dec 29 2013, 08:59 AM

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QUOTE(davidlow7 @ Dec 29 2013, 03:08 AM)
One thing is when you guys decided to keep pressing on brake during a very long-stop.... Wasn't the shiny brake rear lamp is also shining at others' eye for a long period?

It's great that someone had posted to at least a link to an answer from the expert.
*
No choice ma... Doubt you will tell me you will tekan your gear in a start stop jam situation?
kadajawi
post Dec 29 2013, 11:18 AM

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QUOTE(DonMe @ Dec 28 2013, 11:01 PM)
All auto transmission cars will disconnect the clutch/ torque convertor once it detects it is completely stopped and the brake is still pressed. Keep changing between n and d damages the gearbox faster than just pressing on the brake pedal.
I have friends driving same car where 1 will also change to n while waiting while the other just pressed on the brake. In the end the one who keeps changing to n need to change gearbox earlier.
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Ahem, no? DSG does disconnect when stopping, torque converters don't. At least those I drove. Not sure about CVT.

How can you wear out your brake pads when you are not moving? Say you put your hand on a table, and then pull it across the table. There is friction. Press down the hand and move with the same force... More friction. Press so hard that it can't move anymore... No friction. --> can't wear out. Only crawling with the brakes applied (but not to a full stop will wear out).

I usually disengage the gear while still rolling, and engage while rolling. I don't like the jerk when changing into D while standing (even with applied brakes). Getting to a full stop is also not that smooth with an auto gearbox. Not comfortable at all.

My next car will be manual again. There's no way I'll accept a car with automatic gearbox. So bloody troublesome, complicated and uncomfortable.

This post has been edited by kadajawi: Dec 29 2013, 11:25 AM
gjoey
post Dec 29 2013, 01:05 PM

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QUOTE(kadajawi @ Dec 29 2013, 11:18 AM)
Ahem, no? DSG does disconnect when stopping, torque converters don't. At least those I drove. Not sure about CVT.

How can you wear out your brake pads when you are not moving? Say you put your hand on a table, and then pull it across the table. There is friction. Press down the hand and move with the same force... More friction. Press so hard that it can't move anymore... No friction. --> can't wear out. Only crawling with the brakes applied (but not to a full stop will wear out).

I usually disengage the gear while still rolling, and engage while rolling. I don't like the jerk when changing into D while standing (even with applied brakes). Getting to a full stop is also not that smooth with an auto gearbox. Not comfortable at all.

My next car will be manual again. There's no way I'll accept a car with automatic gearbox.  So bloody troublesome, complicated and uncomfortable.
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From what I know, DSG and CVT share the same concept which using clutch to connect to the engine shaft/flywheel. Car using CVT/DSG tends to rolling backwards (Unless there's 'Hill Assist' installed) even in a slight slope when in D mode while you release the brake. They are programmed to disengage the clutch when standstill and engage back when throttle applied. That's why these kind of transmission are also known as semi-auto.

In torque converter transmission, it use fluid as a connector (fluid coupling). However, in some auto transmission, there are ' lockup clutch'. This 'lockup clutch' will bypass the torque converter but only at highest gear. In standstill (D mode), the fluid still flows through the 'turbine' wheel. in a simple words, the transmission 'always connected' in D mode and that's why there are no delays when you hit the acceleration pedal.

For me, personally I will switch to N mode when car is stationary more than 1 minutes. Too much switching will sure deteriorate moving parts especially in stop and go bumper to bumper crawling traffic jam. For CVT/DSG, as they share the same concept, I think the best answer is here :

Punch Powertrain : Proton CVT

Just share my opinion.

Correction : Some CVTs do use torque converter instead of wet clutch.

This post has been edited by gjoey: Dec 29 2013, 02:28 PM
davidlow7
post Dec 29 2013, 02:00 PM

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QUOTE(DonMe @ Dec 29 2013, 08:59 AM)
No choice ma... Doubt you will tell me you will tekan your gear in a start stop jam situation?
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What I was saying is during a "long-stop"
Usually it is by waiting for the traffic light to turn green.....

rcracer
post Dec 29 2013, 02:06 PM

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QUOTE(wayfeel @ Dec 28 2013, 11:06 PM)
I really didnt know that...

INM I heard CVT is not good if brake in Gear D....as well as DSG? True?

I believe quite so for CVT....since they are not EXACTLY conventional AT

But interesting topic though...since is related to good caring of the sensitive and 2nd most expensive component of the car after engine
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doesn't matter what transmission, if they use torque converter which cvt uses, it's still oil that just circulating, it won't heat up anymore than usual operation as there is coolers that take care of that
sitescope
post Dec 29 2013, 02:58 PM

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QUOTE(wayfeel @ Dec 29 2013, 12:10 AM)
When kick down acceleartion, how about the brake pedal, still hold or let go? biggrin.gif sry noob
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Still hold lorrr, if let go u car moving aldy...

I prefer put N coz nowadays when stop start, everyone is busy typing/scrolling with their hp.
So if u forgot to brake or u accidentally lift up ur leg, u car will slowly hit front car while u're busy wassaping/fesbuking/twittering...
eddievh
post Dec 29 2013, 04:02 PM

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For traffic to turn green i will hand brake my car and leave it in D. For stop and go i will use brake. Constantly shifting N D N D is bad for engine mounting,CV joint, Valve body,1st gear clutch pack, lever cable and etc.
nova_freak
post Dec 29 2013, 04:26 PM

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QUOTE(wayfeel @ Dec 29 2013, 12:34 AM)
when is the lastime u change your GB oil, did you check what mileage d? there's one more that cause vibration but i dont rmb what d....after all resort done, then check your engine mounting last, usually not the case for 'normal car'

What car btw
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Ur 8.5 years old City using wat CVT fluid? Service at SC or outside?

BTW, who is that ferman lao?
Post-Je-Ape-Ape
post Dec 29 2013, 05:19 PM

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I do "D" TO "N" all the time. Cuz in "D" car got sound.. Annoy the heck out of me... Especially when red traffic light and its showing "99"... shakehead.gif

If my "D" gear no sound when idle with brake, I'll still put it in "D". (When I kick the air-cond off, the sound will be gone, then I still leave it in "D")

Conclusion, always do your shifting with leg fully pressed on brake, that will give your auto GB the least amount of stress, wear, tear... Every gear change will put at least some amount of wear or stress.

This post has been edited by Post-Je-Ape-Ape: Dec 29 2013, 05:25 PM
okf987
post Dec 29 2013, 05:30 PM

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Just had the same question few weeks ago and asked my mechanic about it. He however suggested that if my car is in a complete stop for a long period of time it is better to switch to N even if your only stopping awhile.

I am driving a Waja 2003 AT model. When I feel the traffic light gona be green soon I just leave it in D otherwise if long stop I will switch to N. However I am still not sure if this is a good driving habit.

Any insight on this matter would be very helpful notworthy.gif


eddievh
post Dec 29 2013, 06:32 PM

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This discussion will bring to a very long and many pages yet don't have concrete answer. There are always got 2 school of thought,the pro N and the Pro D .
wayfeel
post Dec 29 2013, 08:05 PM

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QUOTE(nova_freak @ Dec 29 2013, 04:26 PM)
Ur 8.5 years old City using wat CVT fluid? Service at SC or outside?

BTW, who is that ferman lao?
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Ferman lao is the author write teh article in the earliest link provided in this topic. myb page1

CVTF fluid since delivery. SC for all warranty period and another 1-2 years for that, the rest outside...

No GB juddering at standstill, D or N watsoever, touchwood


unitron
post Dec 29 2013, 08:09 PM

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QUOTE(eddievh @ Dec 29 2013, 06:32 PM)
This discussion will bring to a very long and many pages yet don't have concrete answer. There are always got 2 school of thought,the pro N and the Pro D .
*
There's a simple solution.

Long stop put to N
short stop just put in D...

How long you decide la.. For me it's 30 seconds or so.

Can close thread.
efaceninja
post Dec 29 2013, 08:28 PM

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QUOTE(rcracer @ Dec 28 2013, 10:13 PM)
it can't consume any more than what the idle setting is allowing, if the engine mounting is broken it will also vibrate like hell
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it will consume more fuel if you in D and brake. Because the engine is constantly under load. Confirmed this with OBDII readout.

QUOTE(acbc @ Dec 28 2013, 10:35 PM)
It's ok. In D, the torque converter kept spinning fluid around the GB effectively cooling it down. In N, fluid will heat up.
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ermm.. torque converter is kept spinning, which means the fluid is constantly under stress, friction, motion, and therefore should heat up more than N.

QUOTE(DonMe @ Dec 28 2013, 11:01 PM)
All auto transmission cars will disconnect the clutch/ torque convertor once it detects it is completely stopped and the brake is still pressed. Keep changing between n and d damages the gearbox faster than just pressing on the brake pedal.
I have friends driving same car where 1 will also change to n while waiting while the other just pressed on the brake. In the end the one who keeps changing to n need to change gearbox earlier.
*
i think is totally the otherway round. Most AT when in D, the clutch is always engaged even when brake is pressed. Its just that the torque converter allows enough slippage so that the engine won't stall. I said 'most AT car', because i know some car's gearbox is smarter and will disengage clutch during brake. the first car i experience has that effect is prius C (well i donno if the Snergy Drive system is considered a gearbox in any traditional sense...)

QUOTE(davidlow7 @ Dec 29 2013, 03:08 AM)
One thing is when you guys decided to keep pressing on brake during a very long-stop.... Wasn't the shiny brake rear lamp is also shining at others' eye for a long period?
*
THISSS!! i also hate it when the guy infront me blast my face with his super bright led brake light in a 90 sec red light.

As for myself, i do switch to N during red light or any stops longer than 10-15 secs. i don't think my habit (10-15 secs stops) is considered as N D N D N D which maybe is no good also.

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