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Thread: Does D4 means overdrive?

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    Question Does D4 means overdrive?

    I have a daihatsu mira equipped with normal automatic gearbox. I want to know in which gear should i drive in city D3 or D4 and which one is more economical? A/c to wikipedia newer cars shift themselves to OD automatically, so it is the same case with my car?

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    Speed costs money. How fast do you want to go?

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    Quote Originally Posted by nn View Post
    The overdrive is usually a separate feature and unless you have over drive on -off button you cannot disengage it in your vehicle. The overdrive off- button in simple terms means the car will shift to one gear lower (depending on how many gears in auto box 4 or 5) and remain there. Hope this clears it up for you.
    I think the overdrives function is to put car in higher gear so as to achieve lower rpms. at the same speed. Not to put car in lower gear, which would cause higher rpms

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    Quote Originally Posted by ToxicDevil View Post
    I think the overdrives function is to put car in higher gear so as to achieve lower rpms. at the same speed. Not to put car in lower gear, which would cause higher rpms
    That's what I said, overdrive-off button will turn overdrive off and you will switch to sort of either a lower gear or a fixed gear and your rpms would rise, so wou will have more power and usually its used in hilly areas beacuse of better overatking ability etc.

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    Hmmmm... Toxic Devil and nn you both are correct. What I do while coming to downhill that just put the car in 'N' which sometimes good in terms of economy.
    Speed costs money. How fast do you want to go?

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    down hill in N - you are attempting a suicide.
    never put car in neutral even at stop light, wait for others to tell you the RISK i may sound bit inconsiderate so i leave it for others to explain.
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    Quote Originally Posted by capsat View Post
    down hill in N - you are attempting a suicide.
    never put car in neutral even at stop light, wait for others to tell you the RISK i may sound bit inconsiderate so i leave it for others to explain.
    Why its a suicide? The gears are disengaged from the engine, I think there is no harm in doing that.
    Speed costs money. How fast do you want to go?

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    Quote Originally Posted by shariqak1 View Post
    Why its a suicide? The gears are disengaged from the engine, I think there is no harm in doing that.
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    Isn't it just pressing clutch while coming down from a hill? Thats what we do in manual...
    Speed costs money. How fast do you want to go?

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    Quote Originally Posted by shariqak1 View Post
    Why its a suicide? The gears are disengaged from the engine, I think there is no harm in doing that.
    while driving downhill...brakes are used frequently..due to this frequent and excessive usage the brakes get overheated and hence become less effective or may completely fail to stop the car..remember gravity makes the job even more difficult for the brakes (since the car gains speed while u go downhill due to gravity)...
    therefore, u need the help of "engine-braking" or "braking with gears(downshifting)" ...mtlb going downhill u drive the car in lower gears, which helps reduce the car speed...the rule of thumb is to select the same gears for downhill as u used for going uphill on the same road....
    for engine-braking / braking-with-gears / downshifting...u need the engine RUNNING and the gears ENGAGED (mtlb neutral nahi rakhni car, naa hi engine off rkhna hay)...
    running the car in neutral with engine off may save u some fuel..agreed..!!!
    ..but
    fuel k paisay bachaanay k chakar main dont run the risk of falling off a hill at a sharp corner...!!!

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    ^ Agreed. Got the point! Means k its easier to stop the car with the help of engine-braking as the gravity is acting side by side which results in poor braking if the car is in NEUTRAL... and resulting in overheating of the brakes!
    Speed costs money. How fast do you want to go?

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    it means drive in 4 gears
    means if u use this gear ur car will use all 4 gears...

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    Quote Originally Posted by metalhead View Post
    IMO your auto transmission has four gears... Please confirm.

    D4 means when your car accelerates, it will reach to the top gear i.e. 4. The acceleration depends on the pedal pressed. The accelerator pedal position sensor is there to do this job.

    When you put the gear selector to 3, it will not go to the top gear. Similarly, when 2 is selected, it wont even go to gear 3. The acceleration is totally independent of the position of gear selector lever.

    You should drive in D4 all the time except downhill. You must have noticed the traffic sign "USE LOWER GEARS" on downhills. That gear position 3 and 2 are used constraint the gears to shift up.
    in "2" position, it will not go down to 1st gear, it will remain in 2nd throughout. But in D4 and D3 it will do down to 1st gear...thats how the honda civic auto works, not sure about this one, maybe its also same...OP should check to see if in "2" the car shifts into 1st gear or not..

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    Yeah! the car doesn't shift down to 1 in D2...!
    Speed costs money. How fast do you want to go?

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    Quote Originally Posted by shariqak1 View Post
    ok guys.... but why not i should drive in d4 while coming down from uphill?
    keeping it in D4 would not allow engine braking when you let go of the accelerator pedal, the transmission would coast in overdrive. in 3 or 2 you would have engine braking available to reduce vehicle speed in a controlled fashion without burning the brakes, meaning you have proper traction control.
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    Quote Originally Posted by istafa111 View Post
    For normal driving, drive in D4 if you don't have D other than D4. If you want to use lower gears only, drive in D3 or 2 or L, which ever is present.
    what about 1.6 gli? it got no D or D4
    D3 means the car will be using only 3 gears to drive?
    I heard it got a 4 speed auto tranny , where is the 4th gear?

    Does D4 means overdrive? -1029614
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    Quote Originally Posted by dms664 View Post
    what about 1.6 gli? it got no D or D4
    D3 means the car will be using only 3 gears to drive?
    I heard it got a 4 speed auto tranny , where is the 4th gear?

    Does D4 means overdrive? -1029614
    your select lever has

    P
    R
    N
    D-3
    2
    1

    The D is drive meaning it uses all 4 available gears (dont assume its D3), shift sideways to 3 means that it wont use the highest gear in old toyotas this was accomplished by pressing the O/D off button. The new cars button is now a switch built into the selector.

    btw - whatever you do never shift to neutral if the car is moving - Ive seen people do that to save fuel or whatever but it actually can hurt the trans in certain conditions.
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    True at D-3 you slightly push left for D and for D3 push the lever slightly towards right so your Gli has D and D3.
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    Name:  ImageUploadedByTapatalk1345763703.658744.jpg
Views: 652
Size:  159.8 KB
    This car do not have

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    Quote Originally Posted by memad View Post
    Name:  ImageUploadedByTapatalk1345763703.658744.jpg
Views: 652
Size:  159.8 KB
    This car do not have
    If I am not mistaken, this my friend is a Triptonic gear box. If you pull the lever down from N, then you will be able to drive the car in D (in as many gears as your car has) without manually changing gears (auto transmission). While in D, if you move the lever to the left then this becomes triptonic transmission, meaning you can shift gears up and down while moving the lever up and down and change to lower or higher gears from your current gear. I can not decipher whether your shift will move left or right from the picture but this is precisely what I have deduced from it.

    Please correct me if Im wrong.

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    Quote Originally Posted by Usman Riaz View Post
    If I am not mistaken, this my friend is a Triptonic gear box. If you pull the lever down from N, then you will be able to drive the car in D (in as many gears as your car has) without manually changing gears (auto transmission). While in D, if you move the lever to the left then this becomes triptonic transmission, meaning you can shift gears up and down while moving the lever up and down and change to lower or higher gears from your current gear. I can not decipher whether your shift will move left or right from the picture but this is precisely what I have deduced from it.

    Please correct me if Im wrong.
    no, its the cvt in honda city....(or something similar, looks like a toyota)
    dont know how it works...
    or maybe im wrong cuz it can be a triptonic as well

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    Quote Originally Posted by shariqak1 View Post
    Isn't it just pressing clutch while coming down from a hill? Thats what we do in manual...
    when stationary try pressing your brake pedal back and forth...u will notice this causes your engine to reduce revving idle speed.this is due to the brake booster getting vacuum generated by engine.more vacuum more better it is like a/c in your car, it works well if engine is at @2krpm or so then at mere 500rpms...
    keeping your car neutral will not help your brake perform well plus since a fellow member told k gravity acts and you are pulled downwards which i assume you understood, so my friend keeping your car at lower gears provide your car braking assistance due to engine compression...it is very similar like you drive a manual and speed up in 2nd gear you will notice that if u leave your engine at suppose 4k rpms your car will within 10 seconds be back to 2krpm or so...while if you practice same on top gear of your car your car will tend to coast more further.
    this is due to the gear ratios which get produce more torque less speed and vice versa if you shift to higher gears.since engine produces high torque when provided fuel,and the converse is also true which means it also absorbs high torque ( which u get due to rolling of your car while coming downstream ) at lower gears by converting speed into high rpms for the engine and then the engine compression plays role which i mentioned earlier.
    i hope this serves the purpose well
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