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 Hehe..newbie here..

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TShokuan
post Feb 15 2007, 07:31 PM, updated 18y ago

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Wanna ask a very simple question..What does D1.D2. and L does in auto car?
WaCKy-Angel
post Feb 15 2007, 07:37 PM

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Wah really newbie in car...
http://en.wikipedia.org/wiki/Auto_Transmission
Go read...

Actually i dont really know much either..
I just know for normal driving use D1, D2 for going uphill and L for going downhill


tunertoobe
post Feb 15 2007, 07:42 PM

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D1 is gear 1, D2 will let the transmission shift between gear 1 and 2 and no more.

EDIT: Typo corrected. doh.gif

This post has been edited by tunertoobe: Feb 15 2007, 07:44 PM
TShokuan
post Feb 15 2007, 08:10 PM

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Er..then overtake car need to sue D2 anot?
tunertoobe
post Feb 15 2007, 08:19 PM

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It depends. If your car has enough power leftover then you can overtake with the current gear you're in.

Overtaking using 2nd gear is a bit over the top. Are you talking about overtaking in the highway or on the streets where the speed is around 60? Doesn't matter, using D2 is still too much.
unitron
post Feb 15 2007, 08:21 PM

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QUOTE(hokuan @ Feb 15 2007, 08:10 PM)
Er..then overtake car need to sue D2 anot?
*
depend what car u drive la, ur speed vs the other car speed... got things to consider la..

if the other car go at 10km/h, dun tell me u downshift gear just to overtake.
SUSDavid83
post Feb 15 2007, 08:47 PM

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Does D2 is referring to 2 on the gearbox? Sorry for this foolish question. I'm also a NOOB.
theanswer
post Feb 15 2007, 08:52 PM

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then also got O/D button. Act like D3 if switch off.
Vervain
post Feb 15 2007, 10:30 PM

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D2 means it will shift no more than gear 2, D1 on the other hand locks on the 1st gear. as for overdrive off, it will engage no more than gear 3. thats for a typical 4 speed auto
F1meteor
post Feb 15 2007, 10:46 PM

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kelisa got D4, D3, and L
normal driving use D4.
Overtaking car in normal road use D3
Going up genting also D3
Going down from genting i use L only blush.gif
Devilc0de
post Feb 15 2007, 11:12 PM

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QUOTE(theanswer @ Feb 15 2007, 09:52 PM)
then also got O/D button. Act like D3 if switch off.
*
i still remember last time my father teach me .. O/D button is like NOS biggrin.gif biggrin.gif
thom_chai
post Feb 15 2007, 11:58 PM

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Read the goddamn manual for christ sake...
daddyVW
post Feb 16 2007, 08:52 AM

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Depend on what car you drive. Either 3 gear transmission or 4. As for me i just put on D and let my car adjust herself.. anyway it's AUTO maa... laugh.gif
unitron
post Feb 16 2007, 09:30 AM

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QUOTE(Devilc0de @ Feb 15 2007, 11:12 PM)
i still remember last time my father teach me .. O/D button is like NOS biggrin.gif biggrin.gif
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obviously your father have not sat in a car with NOS engaged.
fuzagi
post Feb 16 2007, 11:02 AM

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im noob oso. got this question. when going down hill like genting road..will using L put more strain on the gear? and engine will rev high. will this cause high FC? or is it better to use D or free gear and brakes?
tunertoobe
post Feb 16 2007, 11:19 AM

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If you use D, you are letting the transmission to shift whatever gear it wants. It won't know you are going downhill, it sense no load and it shifts to a higher gear. You will go very fast down hill if you use high gears.

I think the revs are high when you go downhill in a lower gear because of the gear ratios. In lower gears, the output speed(the speed of the wheels) will be lower than the engine speed. However calculated backwards(from the wheel) the engine will rev higher than the wheel. This induces an engine braking effect. High FC doesnt matter. If you use brakes you can boil the brake fluids if you use it long enough and fast enough and your brakes won't work. sweat.gif

NOTE: This is my theory only, I am open to any corrections. notworthy.gif
zeist
post Feb 16 2007, 11:25 AM

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Rarely use D1 or D2, except going up to Cameron or Genting. tongue.gif
Geric
post Feb 16 2007, 11:31 AM

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Not downhill using L will make your gearbox spoil easily? When i come down from genting i seldom use L i just use D and N free gear... but fast speed la..

Vervain
post Feb 16 2007, 11:44 AM

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L or 2 for downhill genting. this is to provide a drag or slow effect similar to brakes. if you go downhill with high gears, you will only strain on the brakes. the more they are strained, the hotter they get thus you will feel the brakes are not working well when its very hot as the disc and drums are so called melted or smoothen due to excess heat. prolong it, you will notice smoke coming out and continuously doing it will result in brake failure

going down hill with a lower gear as mentioned is exactly like stepping the brakes mildly to slow down. this means you will still can perform instant braking effect upon emergency without the brakes under perform.

some new auto transmission comes with some gyro equipment. they will auto shift down instead of up upon going downhill.
Geric
post Feb 16 2007, 11:50 AM

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Ya my car will auto shift down gear when go downhill .. but i hate this..

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