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 Overdrive in MYVI, how exactly the correct way to use it

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TSkarmakid
post May 7 2007, 02:39 PM, updated 19y ago

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first time for me to drive a car with overdrive features..so i'm not so sure what is the correct way to use it...

for those who doesnt know much about overdrive, can refer here :-
http://en.wikipedia.org/wiki/Overdrive_%28mechanics%29

QUOTE
How an overdrive unit works

The overdrive consists of an electrically or hydraulically operated epicyclic gear train bolted behind the transmission unit. It can either couple the input driveshaft directly to the output shaft (or propeller shaft) (1:1), or increase the output speed so that it turns faster than the input shaft (1:1 + n). Thus the output shaft may be "overdriven" relative to the input shaft. In newer transmissions, the overdrive speed(s) are typically as a result of combinations of planetary/epicyclic gearsets which are integrated in the transmission. In these cases, there is no separately identifiable "overdrive" unit. A number of such transmissions and transaxles are manufactured by Aisin, for use in vehicles produced by many different manufacturers. In older vehicles, it is sometimes actuated by a knob or button, often incorporated into the gearshift knob, and does not require operation of the clutch. Newer vehicles have electronic overdrive in which the computer automatically adjusts to the conditions of power need and load.


despite the info shown above, i'm quite confuse on the overdrive function because :-

1) i have the wrong perception earlier that overdrive is like lower your gear from 3rd to 2nd (for auto) and like 5 gear to 4th gear (in manual). more power and higher rpm when you need to overtake any vehicle in front. in other words, if i'm driving auto, i'm using D gear and when i wanna overtake a car with more power, i'll change to 2 gear. but instead of doing that i will on the "overdrive" and it should have enough power to overtake it.

but with the explanation above in wikipedia, it seems like overdrive is to change from 3rd gear to virtual 4th gear. meaning better fuel saving and lesser rpm.

so am i wrong having my own thinking earlier?

if i am, should i keep the overdrive function ON all the time for myvi auto?

i heard from my friend frequent use of overdrive is not good for the gearbox...
abit confuse alridi...
TSkarmakid
post May 7 2007, 02:47 PM

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haha so u guys perception are same with mine...

whereby what explained in wikipedia is the other way round.

so one question, what is the diff between "overdrive" and you manually change from D -> 2 ?
TSkarmakid
post May 7 2007, 03:28 PM

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thx guys to clear up my doubts...

1 last question, what is the diff if i "turn off my overdrive for higher rpm" and "i change to 3"?
TSkarmakid
post May 7 2007, 03:43 PM

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yea yea...actually i wanna clarify if that "assumption" is correct or not...

i get a feeling that O/D off will save some tear and wear issue, compare to shifting to 2nd gear...but jst wanna confirm on that.
TSkarmakid
post May 7 2007, 03:52 PM

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ok ok....generally concept it's like that la....
well i think kia and myvi gearbox somehow diff in performance also...maybe i should try it out later....
TSkarmakid
post May 7 2007, 08:31 PM

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jst got my myvi earlier...so happy la....

so, wanna chk something with the myvi owners. if the "O/D OFF" light in ON on the meter panel, does it mean that overdrive is on? or overdrive is off?

i was told by the sales agent just now that if the "O/D OFF" light is ON, it means overdrive is on and it is something like virtual 4th gear will turned to 3rd gear. he himself drive myvi.

so i'm thinking maybe he's wrong. maybe if the "O/D OFF" light is ON, it means overdrive is off?

anyone can clarify?
TSkarmakid
post May 8 2007, 01:01 AM

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thx guys.

so last time clarify it,

if the O/D light is ON on the meter panel, it means that the O/D is off.

by default, the O/D is on and the O/D light will be off in the meter panel.

right?
TSkarmakid
post May 8 2007, 01:52 PM

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ruga, how sure are you on the points you gave out earlier?

a forumer called bearbear said

QUOTE
normally what i'll do is turn off O/D first to get abit more power, if it's not enough then shift to 2nd gear.

So i assume using O/D will save u some tear and wear on ur gearbox compare to shifting to 2nd gear?


i have tis feeling also...say assuming it's L-2-D, meaning first gear-second gear-third gear.

when O/D is on, it will go to virtual 4th gear. if i off the O/D, then it will lower gear virtually. logically, it should be betta rather than i change gear to 2 right?
TSkarmakid
post May 8 2007, 05:06 PM

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i understand now la....

so i can say, like for pure city driving, at time, it's better to OFF the O/D, to avoid the gearbox unnecessarily change from 3rd gear to 4th gear all the time. might as well stick to 3rd gear max.

same with going to genting, jst OFF the O/D.

arigatou

 

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