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Automatic Transmission
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Ishe
General Member


Joined: 12 May 2005
Posts: 27
Location: KL

PostPosted: Mon Jun 06, 2005 1:43 pm    Post subject: Automatic Transmission Reply with quote

Hello guys,

I'm kind of new with A/T so maybe can give advise especially when to use 2 gear or L gear....[/b]
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dagg3r
Junior Member


Joined: 27 Aug 2004
Posts: 224
Location: Subang Jaya, Selangor

PostPosted: Mon Jun 06, 2005 2:05 pm    Post subject: Re: Transmission Reply with quote

Ishe wrote:
Hello guys,

I'm kind of new with A/T so maybe can give advise especially when to use 2 gear or L gear....[/b]


well, if you're not going to keep to that speed and hi rev RPM, better to stay at D. Using 2 or L will give you a lock gear... like manual, staying at gear 2 or first gear all the time... That's all.
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chkwong
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Joined: 24 Jun 2004
Posts: 882
Location: Bandar Kinrara, Puchong

PostPosted: Tue Jun 07, 2005 7:45 am    Post subject: Reply with quote

With Accent's intelligent ECU and grade/fuzzy logic controlled AT gear, there's no need to shift to 2 or L, the program itself is intelligent enough. I had never ever driven my Accent in 2 or L even going steep uphill in Puchong. It's just intelligent enough to shift to lower gear and hold it there until I goes over the hill. I don't even use the OD button, i.e. OD on all the time, tat is no OD lights on the meter cluster.
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chinhai8
Senior Member


Joined: 12 Apr 2005
Posts: 937
Location: Kuala Lumpur

PostPosted: Thu Jun 09, 2005 9:58 pm    Post subject: Reply with quote

It is the more i accelerate,the higher rpm it will go for changing the gear.
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slbeh
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Joined: 23 Jun 2004
Posts: 1696
Location: Kuala Lumpur

PostPosted: Tue Jun 14, 2005 10:00 am    Post subject: Reply with quote


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slbeh
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Joined: 23 Jun 2004
Posts: 1696
Location: Kuala Lumpur

PostPosted: Tue Jun 14, 2005 10:02 am    Post subject: Reply with quote

Code:
eddievh

Total Posts: 1095
Member Since: 24-Aug-2002
About Me posted on 3-Jun-05 23:00 [edited 0 times] [edit] [delete]

--------------------------------------------------------------------------------
If you love your transmission so much,don't do such thing so often.
The 2nd one(N while Coasting) is very tortures to transmission. When you
put N while coasting at high speed then you engage back D the transmission
will mabuk kejab don't know which gear(planetary gearset,valve body and
solenoid all mabuk) normally Gb will select 3rd gear then very fast shift
to top gear(4Th) this will unnessary wear 3rd and 4th gear friction lining.
Automatic are mean to be automatic which traslate no manual gatal tangan
shift the gear lever.
 

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slbeh
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PostPosted: Tue Jun 14, 2005 10:03 am    Post subject: Reply with quote

Code:
skyline77

Total Posts: 8
Member Since: 12-Jun-2005
About Me posted on 12-Jun-05 15:25 [edited 0 times] [edit] [delete]

--------------------------------------------------------------------------------
Changing D to N and vice versa could cause severe gearbox problem. Of
course, the prob would not be instantenous but it will affect the gearbox
life. Do u want to save some petrol by changing D to N and get your
gearbox ruin? Gearbox is very expensive.. so think twice before doing that.

The best practice is, leave the AT gear at D, and only change it to N and
P when:
--- a long stop (e.g. long waiting time at traffic light or waiting for
your gf to finish shopping)
--- parking

if u r in traffic jam (stop and go) or brief traffic light stop, keep it
at D (will save wear and tear).
---------------
--honk/flash me if i did something wrong on the road and thank you in advance for saving my life and yours--
 

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slbeh
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PostPosted: Tue Jun 14, 2005 10:04 am    Post subject: Reply with quote

Code:
soulover

Total Posts: 125
Member Since: 21-Aug-2003
About Me posted on 13-Jun-05 11:00 [edited 0 times] [edit] [delete]

--------------------------------------------------------------------------------
I don't know who is the one that misleading.

Shifting from D-N-D when cruising is very dangerous!
-Your car might stall when cruising on N, causing losing braking power
(brake pump booster not working).

You won't save fuel at Neutral. It will spoil your gear box instead. Same
goes with revving engine at Neutral.

Agree with skyline77 to some extend. Unless u gonna stop for abot 10 mins
or so, better not change to N. The longest traffic lightIf stop before is
only 3 minutes. For 15 mins stop, better off your engine for heat will
build up at the catalytic converter and causes damages.
---------------

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slbeh
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Joined: 23 Jun 2004
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PostPosted: Tue Jun 14, 2005 10:05 am    Post subject: Reply with quote

Code:
skyline77

Total Posts: 8
Member Since: 12-Jun-2005
About Me posted on 14-Jun-05 2:17 [edited 0 times] [edit] [delete]

--------------------------------------------------------------------------------
Changing from D to N while driving could cause 'shock' to the torque
convertor and the whole gearbox component. This 'shock' would cause
premature wear and tear, especially to the valve in the gearbox.

Another reason, when you are going downhill in D, without accelerating
(foot is off the accelerator pedal), petrol is already at it minimal and
thus no point in changing it to N (furthermore, you are eliminating engine
braking effect which is a better practice than using service brake when
going downhill).

For fuzzy logic equipped gearbox (those in Proton Perdana), the gearbox
will automatically drop one gear if it sense the car is going downhill and
helps you decent properly with a better traction.

For car without fuzzy logic gearbox, try changing to 3 and not to N.
Losing engine braking (as said by soulover) could cause accident due to
lose of traction.
---------------
--honk/flash me if i did something wrong on the road and thank you in advance for saving my life and yours--

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slbeh
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PostPosted: Tue Jun 14, 2005 10:06 am    Post subject: Reply with quote

Code:
soulover

Total Posts: 125
Member Since: 21-Aug-2003
About Me posted on 14-Jun-05 9:22 [edited 0 times] [edit] [delete]

--------------------------------------------------------------------------------
As said by skyline77, the "shock" or rather the engagement of torque
converter is in fact one of the most deadly enemy to the lifespan of a
gearbox, as far as tear and wear is concerned.

The above topic is already discussed several times by the forummers and i
concluded not to change D-N-D after i read Daddy Fixit(a mechanical
engineer with PhD in automotive engineering) article about this topic
published in theStar Sunday magazine.

For some automatic transmission car especially those older generation or
Proton cars, I can undetstand that the whole car rattling like crazy if
not shift to D. But for the sake of the very expensive gearbox, i urge u
stick to D.

I also understand those uncle or grandfather who used to drive manual
will sure ask u to change to N coz it's a good practise for manual driven
car. But sad to say, they are wrong!

Some say that if Keep to D when car is stopping will build up heat in
gearbox thus spoiling the gearbox. I can tell you again they are wrong.
Quoted Daddy Fixit, the heat actually build up when the car is travelling
where power losses when transmitting the engine generated torques to the
wheels not when the car is idling. The auto gearbox nowadays have a
hydraulic cooling system that will automatically cool down the gearbox
when the car is not moving. It's a total different mechanism compare to
manual gearbox.

Some say holdind brake when geared at D will stress the engine and the
brakes. I can tell you, it won't. At D, the potential energy holded by
the brake is nothing stressful comparing when u press your throttle from
idling state. U can imagine the total weigth of the car(say 1200kg/11760
Newton) is suddenly loading the engine when u press your throttle from
idling state. So, the stress on the engine when holding at D is
incomparable to what your engine can take. Stressing your brake? How much
is your brake pad? RM40? How much is your gearbox then? RM20,000? No need
to elaborate further.

All in all, stick to D when idling and please let the "automatic" gearbox
fulfill its destiny as a "automatic" gearbox. No itchy itchy hands like
wat Skyline77 said before
.
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slbeh
Site Admin


Joined: 23 Jun 2004
Posts: 1696
Location: Kuala Lumpur

PostPosted: Tue Jun 14, 2005 10:07 am    Post subject: Reply with quote

overall, I agree with skyline77 Very Happy
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chkwong
Senior Member


Joined: 24 Jun 2004
Posts: 882
Location: Bandar Kinrara, Puchong

PostPosted: Tue Jun 14, 2005 9:38 pm    Post subject: Reply with quote

Tats what I've been trying to say. You don't buy an auto gear car and act like manual one, shifting here and there. Might as well get a manual gear instead. Auto gear is for convenience, so tat one hv time to look around during driving. Hehehe. Laughing
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chinhai8
Senior Member


Joined: 12 Apr 2005
Posts: 937
Location: Kuala Lumpur

PostPosted: Tue Jun 14, 2005 10:42 pm    Post subject: Reply with quote

i always engage in "D" so i can concentrate on the road!!and see around.haha Smile
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Ishe
General Member


Joined: 12 May 2005
Posts: 27
Location: KL

PostPosted: Thu Jun 16, 2005 11:07 am    Post subject: FuzzyLogic Reply with quote

Last weekend i went back to my hometown, Kota Bharu Kelantan....

I'm very pleased with my Accent coz fuzzyl logic work very good when mendaki bukit especially those bukit along Kuala Lipis to Gua Musang.

Even my wife and my kid was at the back, my Accent keep on climbing very well.....and gave me confident.

So whoever wanna try this canggih punya equipment, please go Cuti-Cuti to Kota Bharu....
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chinhai8
Senior Member


Joined: 12 Apr 2005
Posts: 937
Location: Kuala Lumpur

PostPosted: Thu Jun 16, 2005 11:21 am    Post subject: Reply with quote

Look like i have go to some hill places already!!even though my baby accent is 1 year and 3 years old already but i have no try it on hill road before!! Very Happy
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