Overdrive Button Clarification

Kavvz · August 11, 2015

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.

No you are right. It doesn't make a big difference for engine braking.

If you're driving at highway speeds and you turn O/D off of course you're feel a difference as the car will shift down a gear, which is handy when over taking, or for when driving along long sweeping curves; but pretty insignificant when you want any engine braking for coming down a lengthy decline.

For engine braking as you and other members mentioned you usually need to change into manual mode or switch into a preset lower gear ratio like L or D2 / D3 ( or 2, 3 or however its marked),

Edited August 11, 2015 by Kavvz

Magnum · August 12, 2015

On 8/11/2015 at 5:47 PM, Kavvz said:
No you are right. It doesn't make a big difference for engine braking.
If you're driving at highway speeds and you turn O/D off of course you're feel a difference as the car will shift down a gear, which is handy when over taking, or for when driving along long sweeping curves; but pretty insignificant when you want any engine braking for coming down a lengthy decline.

For engine braking as you and other members mentioned you usually need to change into manual mode or switch into a preset lower gear ratio like L or D2 / D3 ( or 2, 3 or however its marked),

wait...are you saying D3 and O/D are different?

Magnum · August 12, 2015

To be honest I would burn bit more fuel than wearing out the brake pads excessively, I heard of an incident where smoke started coming out of the brakes when he went down a long decline on D with all the work given to the brakes, the vehicle was a Nissan Vanette.

Anyway on the user manual it states to use the D3 when going downhill, atleast it does on mine

Something I have noticed about automatics is that when we are going downhill in D especially when we let go off the brakes it straight away goes to the last gear where as in a manual we stick at the 3rd gear or maximum 4th.

On the topic of brakes those aftermarket pads are rubbish. I once used them on my car and ended bringing a genuine set from Japan before the aftermarket set was worn out

aruntantan · August 12, 2015

On 8/11/2015 at 5:17 PM, Schiffer said:
tbh i dont see anything wrong with that.
Not everyone buys a car for plesure. some just wants a comfortable way to travel from A - B and it to be economical.

Could have been worse, could have gone to a Indian peice of shit.

For some people who travel a lot, fuel economy is a must. and 20000 on fuel?

Are you taking Trips to the Moon?

20000/117 = ~ 170 L

if the average is 10kmpl total I can run 1700km.

weekdays from home to office and office to home 60km * 20 = 1200km..

Weekends definitely go out for at least one trip or something cost me another 400km and other 100km for other...

Better to go for a hybrid wage.. :speechless-smiley-019:

Edited August 12, 2015 by aruntantan

NPP · August 13, 2015

On 8/12/2015 at 8:26 AM, aruntantan said:
20000/117 = ~ 170 L
if the average is 10kmpl total I can run 1700km.

weekdays from home to office and office to home 60km * 20 = 1200km..

Weekends definitely go out for at least one trip or something cost me another 400km and other 100km for other...

Better to go for a hybrid wage.. :speechless-smiley-019:

117? Passo is a petrol isn't it? And it should be abl to do more thatn 10 I think. Hybrid is ok but you must see if the extra amount you are going to use is worth it. Consider the steeper depreciation as well.

Kavvz · August 13, 2015

On 8/12/2015 at 1:14 AM, Magnum said:
wait...are you saying D3 and O/D are different?

Nopes, sorry if my post was too vague.

My thought was that:

1. At highway speeds turning O/D off will allow you to drop a gear thereby allowing you to overtake someone or is useful for holding the car in a lower gear so as to provide for more control as determined by the road conditions (in my case it was usually when taking long sweeping curves that robbed forward speed. Flipping the O/D off meant I could accelerate sharply out of and between each turn as needed).

2. The engine braking offered by flipping the O/D off is limited and for declines / it may be necessary to flip into manual mode or to switch into a preset lower gear ratio as needed.

Notes: If turning O/D off is sufficient for the descents that you encounter on the KDH, I guess thats great . My experience is different, and stems from an ugly point in my life when I drove a Civic. Thankfully those times are behind me now But to be honest I'm surprised the KDH even has an OD on-off switch. Most modern vehicles don't.

Edited August 13, 2015 by Kavvz

Magnum · August 13, 2015

On 8/13/2015 at 2:45 AM, Kavvz said:
Nopes, sorry if my post was too vague.
My thought was that:

1. At highway speeds turning O/D off will allow you to drop a gear thereby allowing you to overtake someone or is useful for holding the car in a lower gear so as to provide for more control as determined by the road conditions (in my case it was usually when taking long sweeping curves that robbed forward speed. Flipping the O/D off meant I could accelerate sharply out of and between each turn as needed).

2. The engine braking offered by flipping the O/D off is limited and for declines / it may be necessary to flip into manual mode or to switch into a preset lower gear ratio as needed.

Notes: If turning O/D off is sufficient for the descents that you encounter on the KDH, I guess thats great . My experience is different, and stems from an ugly point in my life when I drove a Civic. Thankfully those times are behind me now But to be honest I'm surprised the KDH even has an OD on-off switch. Most modern vehicles don't.

KDH has D3 no O/D, the previous generation which is known as 'Dolphin' has O/D

I understand what you mean by in your first point, If I remember right the KDH could run up to 110km/h in D3, I have used D3 at around 60-80km/h on a flat surface and when I stepped on the accelerator hard there was a difference in acceleration from D, it felt like the van was trying to run away from me

And regarding your second point, I think I find D3 enough for hill descends cuz diesel have a shorter a gear ratio/rev band, the gearing ratio/rev band probably plays a role in engine braking, Hiace(KDH) red lines at around 4200PM

On the topic of engine braking petrol vehicles start engine braking the moment you let go off the gas, diesels dont which is why its easier to crawl with diesels without accelerating

Kavvz · August 13, 2015

Magnum said:

KDH has D3 no O/D, the previous generation which is known as 'Dolphin' has O/D

Ah, I see.

Magnum said:

On the topic of engine braking petrol vehicles start engine braking the moment you let go off the gas, diesels dont which is why its easier to crawl with diesels without accelerating

Weird. My experience is otherwise. We till recently had a diesel car in the family, and we currently have a diesel SUV and on both of those the engine braking is evident as soon as you let off the accelerator, where as on my petrol Nissan, its less evident. It could be 'cos the Nissan has a CVT, but even when compared with a regular transmission I feel the diesel car would have an increased tendency towards engine braking.

Edited August 13, 2015 by Kavvz

Magnum · August 13, 2015

On 8/13/2015 at 3:33 AM, Kavvz said:
Ah, I see.
Weird. My experience is otherwise. We till recently had a diesel car in the family, and we currently have a diesel SUV and on both of those the engine braking is evident as soon as you let off the accelerator, where as on my petrol Nissan, its less evident. It could be 'cos the Nissan has a CVT, but even when compared with a regular transmission I feel the diesel car would have an increased tendency towards engine braking.

Ooops! I got that mixed up! Yep diesels have more engine braking, I had been mislead all these days by an Indian forum.

but yes crawling is easier with diesels than gasoline engines, my Hiace sometimes crawls uphill as well

Schiffer · August 13, 2015

On 8/12/2015 at 8:26 AM, aruntantan said:
20000/117 = ~ 170 L
if the average is 10kmpl total I can run 1700km.

weekdays from home to office and office to home 60km * 20 = 1200km..

Weekends definitely go out for at least one trip or something cost me another 400km and other 100km for other...

Better to go for a hybrid wage.. :speechless-smiley-019:

Keep your O/D on and forget about it.

and try changing your driving style if your getting only 10kmpl

Passo is a very Rev happy car coz of its underpowerd 1ltr engine.

try driving slower and adjusting your foot on the accelerator for it to change gears quciker without flooring it (which you will get used to after driving for a while)

and you should be able to get over 12-15kmpl

aruntantan · August 13, 2015

On 8/13/2015 at 10:25 AM, Schiffer said:
Keep your O/D on and forget about it.
and try changing your driving style if your getting only 10kmpl

Passo is a very Rev happy car coz of its underpowerd 1ltr engine.

try driving slower and adjusting your foot on the accelerator for it to change gears quciker without flooring it (which you will get used to after driving for a while)

and you should be able to get over 12-15kmpl

Recenty I've done a Engine Tune Up also.

Changed the three plugs.. Replaced the air filter. Still no luck with fuel improvement.

And also after the tune up I feel like the idle is too high (900 to 1000 with AC on), like when I stopped the vehicle, have to press the brakes harder than earlier to keep it stopped.

Is this normal?.. Or should I reduce the idle RPM?..

Schiffer · August 13, 2015

On 8/13/2015 at 12:07 PM, aruntantan said:
Recenty I've done a Engine Tune Up also.
Changed the three plugs.. Replaced the air filter. Still no luck with fuel improvement.

And also after the tune up I feel like the idle is too high (900 to 1000 with AC on), like when I stopped the vehicle, have to press the brakes harder than earlier to keep it stopped.

Is this normal?.. Or should I reduce the idle RPM?..

actually our passo doenst have a RPM meter so no idea whats the idle RPM but 1000 seems a bit too much with AC

like i said adjust your driving style and it will do more. ours does around 12 in city with AC

aruntantan · August 13, 2015

On 8/13/2015 at 2:54 PM, Schiffer said:
actually our passo doenst have a RPM meter so no idea whats the idle RPM but 1000 seems a bit too much with AC
like i said adjust your driving style and it will do more. ours does around 12 in city with AC

Sorry forgot to mention that RPM was calculated using that tablet kind of gadget you plug into the car.. :pardon: