Overdrive Button Clarification

aruntantan · August 8, 2015

Hi Autolankans,

I use a Toyota Passo (2004 model) and there is a small button near gear shifter, OverDrive.

Can someone explain the usage of this button?.. In normal traffic dirve should we turn OFF/ON?.. In highway should we turn OFF/ON?..

Regards,

Schiffer · August 8, 2015

Overdrive is the 4th Gear

its better to leave it on all the time,

The only place i could think of using the OD is when going up or down a hill.

*Up a hill to limit the hunting of gears (depend on how you accelerate)

*and down a hill to give a bit of engine breaking.

Magnum · August 8, 2015

The Hiace has D3 instead of O/D and it makes a major difference when going downhill, plus on a 2 tonne vehicle like the Hiace its not a good idea go down a hill with all the strain put on the breaks

hrm · August 8, 2015

That's what usually "B" does in CVTs.

aruntantan · August 8, 2015

On 8/8/2015 at 8:29 AM, Schiffer said:

Overdrive is the 4th Gear

its better to leave it on all the time,

The only place i could think of using the OD is when going up or down a hill.

*Up a hill to limit the hunting of gears (depend on how you accelerate)

*and down a hill to give a bit of engine breaking.

Hmm better to Turn OD on normal conditions?. Like driving in colombo?..

Magnum · August 8, 2015

On 8/8/2015 at 12:03 PM, aruntantan said:
Hmm better to Turn OD on normal conditions?. Like driving in colombo?..

Yes i keep O/D on during normal driving or else it puts an extra strain on the gearbox

Schiffer · August 8, 2015

On 8/8/2015 at 12:03 PM, aruntantan said:
Hmm better to Turn OD on normal conditions?. Like driving in colombo?..

Yeap O/D off means There will be more gear changes, and that means more efficent and a smoother ride

Edited August 8, 2015 by Schiffer

Magnum · August 9, 2015

On 8/8/2015 at 4:01 PM, Schiffer said:

Yeap O/D off means There will be more gear changes, and that means more efficent and a smoother ride

O/D on means more gear changes

with O/D off the last gear is unavailable

JFLanka · August 9, 2015

On 8/8/2015 at 12:03 PM, aruntantan said:
Hmm better to Turn OD on normal conditions?. Like driving in colombo?..

Basically O/D means the final gear.. Leaving O/D on in traffic makes no difference.. But when you are driving 50+ kmph where you can use the last gear., keep O/D on so the gearbox can use the final gear.. O/D allows your vehicle to operate at a lower rpm at higher speeds and it gives you better fuel economy and quieter ride..

Schiffer · August 9, 2015

On 8/9/2015 at 2:05 AM, Magnum said:
O/D on means more gear changes
with O/D off the last gear is unavailable

oh yea i meant OD on

Schiffer · August 9, 2015

plus i havent come across a place in colombo to swith the OD off still.

JFLanka · August 9, 2015

On 8/8/2015 at 11:21 AM, hrm said:
That's what usually "B" does in CVTs.

AFAIK it is for the "Engine Braking".. It adds more drag when decelerating..

JFLanka · August 9, 2015

On 8/9/2015 at 5:25 AM, Schiffer said:

plus i havent come across a place in colombo to swith the OD off still.

U mean OD on ryt?

Schiffer · August 9, 2015

On 8/9/2015 at 5:38 AM, JFLanka said:

U mean OD on ryt?

nope off,

like i said earlier, you would need it when cruising down a steap hill or going up a very steap hill

i havent encounter yet a place in colombo like so.

in kandy and nurawaeliya, yes

Magnum · August 9, 2015

Let me make this simple
when O/D is deactivate/off light comes on the instrument cluster , when O/D is active/on light on the instrument cluster stays off

You keep O/D on(light off) during normal driving

you turn O/D off(light comes on) when going downhill if needed when going up hill as well or when towing

If you are speeding on a flat road with O/D off its gonna put a strain on the gearbox

NPP · August 9, 2015

Does O/D off really give engine braking? I thought that's only on L and 2 whie O/D off simply stops shifting to the last gear. Correct me if I'm mistaken.

Schiffer · August 9, 2015

On 8/9/2015 at 1:19 PM, NPP said:
Does O/D off really give engine braking? I thought that's only on L and 2 whie O/D off simply stops shifting to the last gear. Correct me if I'm mistaken.

it does but at some speed

Magnum · August 10, 2015

On 8/9/2015 at 1:19 PM, NPP said:
Does O/D off really give engine braking? I thought that's only on L and 2 whie O/D off simply stops shifting to the last gear. Correct me if I'm mistaken.

Im not sure how it is on a car, but on my Hiace it makes quite a difference. Once while going down Kadugannawa I had it in D3 and shifted to D4 to see the difference, it felt like as if I lost the brakes all of a sudden

aruntantan · August 10, 2015

On 8/8/2015 at 12:52 PM, Magnum said:
Yes i keep O/D on during normal driving or else it puts an extra strain on the gearbox

Thanks for the clarifications.. By the way is there any SIGNIFICANT impact on fuel consumption?

Schiffer · August 10, 2015

Yes, since the top gear cannot be reached the engine revs more which means more fuel is burned.

luckey007 · August 11, 2015

On 8/10/2015 at 3:33 PM, aruntantan said:
Thanks for the clarifications.. By the way is there any SIGNIFICANT impact on fuel consumption?

I do not personally blame you. But you (most of new car owners) will do anything -even harmful-to your vehicle to save fuel. Thanks to new EFI systems you can't change fuel mixtures. Otherwise all vehicles will end up with burnt rings and pistons.

aruntantan · August 11, 2015

On 8/11/2015 at 12:00 AM, luckey007 said:
I do not personally blame you. But you (most of new car owners) will do anything -even harmful-to your vehicle to save fuel. Thanks to new EFI systems you can't change fuel mixtures. Otherwise all vehicles will end up with burnt rings and pistons.

new car owner?.. :sad-smiley-067:

luckey007 · August 11, 2015

On 8/11/2015 at 3:13 PM, aruntantan said:
new car owner?.. :sad-smiley-067:

Not meant personally you!!! BUT YES!!! LOT OF NEW CAR OWNERS....(whom may have been upgraded from their Indian dara messa type motor bike or tuk-tuk. They will do anything to save a drop of fuel.

aruntantan · August 11, 2015

On 8/11/2015 at 4:18 PM, luckey007 said:
Not meant personally you!!! BUT YES!!! LOT OF NEW CAR OWNERS....(whom may have been upgraded from their Indian dara messa type motor bike or tuk-tuk. They will do anything to save a drop of fuel.

This is my first vehicle and what I can buy from my salary level.. For the record, costs me around 20,000 per month only for fuel.. :speechless-smiley-004: