My Guru's I have come again, I have noticed that at high speeds, some drivers will switch their automatic from D to N on high speeds, my question is this

1. Will doing that damage the transmission

2. Will any fuel be saved coasting in N than coasting in D without depressing the accelerator?

3. If both have different advantage in use I.e one can be used going down hill and one is good like on third mainland bridge with light traffic.

Gurus your enlightenment is needed.

men have gone for lunch. dey will be back shortly.

we need d gurus to respond to this question because I remember afriend told.me he practices it in his honda accord bulldog whenever he is traveling nd even within city.he has been using his vehicle for over 4 years and I still saw him last week and the ride transmission is as smooth as ever.he claims his fuel consumption is exceptionally low.
what he did d day I drove wit him was to accelerate to like 80 -100 den slip d gear to neutral nd uses d speed wit brake for a considerable distance b4 accelerating again.
I have neva tried it before, but if our car specialist hia say its ok nd cn save fuel den will b glad 2 jump on d bandwagon.

Yes it is okay. After all you guys love to buy new engines, just add a transmission to your shopping list.

nurey:
My Guru's I have come again, I have noticed that at high speeds, some drivers will switch their automatic from D to N on high speeds, my question is this

1. Will doing that damage the transmission

2. Will any fuel be saved coasting in N than coasting in D without depressing the accelerator?

3. If both have different advantage in use I.e one can be used going down hill and one is good like on third mainland bridge with light traffic.

Gurus your enlightenment is needed.

I have one answer to all three questions, NOP,if you check you are meant to be stationary to change the gear selector, doing any of them three has no advantage whatsoever, Its Automatic for a reason as it has the ability to select higher or lower gear as deem fit by speed and motion, coasting also deprives the vehicle of Engine braking. I think we covered this in subsequent post somewhere on the Auto section a year ago.

Its not really advisable to put your auto trans in neutral to coast for considerable periods of time. With parts still moving, the pump in your trans needs to be pumping the fluid round to keep things cool in there. Secondly, accelerating and then coasting in neutral and then accelerating again, isn't going to give you really good fuel economy. I have monitored my real time mpg figures using a scan tool while driving and came to realize that this method doesn't really give good fuel economy. Maintaining a steady speed on the other hand does.
Most new cars have fuel cut off technology that automatically cuts off fuel when a vehicle is coasting with high RPMS. This usually happens when going downhill. So shifting your gear to N will take away this function. In N, the ecm will still inject small amounts of fuel to keep the engine running while if it was in D, the momentum of the tires and crankshafts linked together by the gear will keep the engine ticking but without using any fuel. The fuel cut off is usually around 1500 rpm on most cars. When going downhill, leave your gear in drive and take ur foot off the accelerator. It gives you engine braking, fuel cut off and enough time to react if anything goes awry.

I am here to learn.
#spreads blanket

9icetoo, does this apply to CVT or hydraulic transmission?

9icetoo:
Its not really advisable to put your auto trans in neutral to coast for considerable periods of time. With parts still moving, the pump in your trans needs to be pumping the fluid round to keep things cool in there. Secondly, accelerating and then coasting in neutral and then accelerating again, isn't going to give you really good fuel economy. I have monitored my real time mpg figures using a scan tool while driving and came to realize that this method doesn't really give good fuel economy. Maintaining a steady speed on the other hand does.
Most new cars have fuel cut off technology that automatically cuts off fuel when a vehicle is coasting with high RPMS. This usually happens when going downhill. So shifting your gear to N will take away this function. In N, the ecm will still inject small amounts of fuel to keep the engine running while if it was in D, the momentum of the tires and crankshafts linked together by the gear will keep the engine ticking but without using any fuel. The fuel cut off is usually around 1500 rpm on most cars. When going downhill, leave your gear in drive and take ur foot off the accelerator. It gives you engine braking, fuel cut off and enough time to react if anything goes awry.

Nice explanation.

dokilolo:
we need d gurus to respond to this question because I remember afriend told.me he practices it in his honda accord bulldog whenever he is traveling nd even within city.he has been using his vehicle for over 4 years and I still saw him last week and the ride transmission is as smooth as ever.he claims his fuel consumption is exceptionally low.
what he did d day I drove wit him was to accelerate to like 80 -100 den slip d gear to neutral nd uses d speed wit brake for a considerable distance b4 accelerating again.
I have neva tried it before, but if our car specialist hia say its ok nd cn save fuel den will b glad 2 jump on d bandwagon.

That's not a good attitude to life, believe me. The world or everyone is not always right. Everyone or the world during Jesus Christ trial shouted, "Crucify him, crucify him!". As if that was not enough, they went on to shout, "Let his blood be on our heads and on our children's children's head", even though they were told by their leader that the man's hand they wanted his head was clean; even when they knew inside themselves that the man was innocent. I would advise you change that mindset.

As for what you said about your friend and how he uses his Honda, tell him that's too bad for him for abusing that transmission in that manner.

Ikenna

Its abuse like this topic that I explained in the DVD I produced, the need for people to always read their owners manual of any car they upgrade to. That you have been driving for years or owned million of cars doesn't mean you know the do's and donts of every car.

For some Peugeot owners manuals I have seen and read, Peugeot warned that one with Auto transmission should not be towed with the wheels the tranny propels on the ground, to a certain km. Better still, the wheels have to be off the ground. But most Nigerians do that with impunity. Tomorrow, if their Auto transmission fail, they would complain to the world that Peugeot cars are not reliable.

Besides, I wonder why Nigerians have become misers to the point that they don't want their cars to run with any form of energy. Anyone that is that crazy to go green should revert to bicycle, not even motorcycles.

Ikenna

dokilolo:
we need d gurus to respond to this question because I remember afriend told.me he practices it in his honda accord bulldog whenever he is traveling nd even within city.he has been using his vehicle for over 4 years and I still saw him last week and the ride transmission is as smooth as ever.he claims his fuel consumption is exceptionally low.
what he did d day I drove wit him was to accelerate to like 80 -100 den slip d gear to neutral nd uses d speed wit brake for a considerable distance b4 accelerating again.
I have neva tried it before, but if our car specialist hia say its ok nd cn save fuel den will b glad 2 jump on d bandwagon.

9icetoo:
Its not really advisable to put your auto trans in neutral to coast for considerable periods of time. With parts still moving, the pump in your trans needs to be pumping the fluid round to keep things cool in there. Secondly, accelerating and then coasting in neutral and then accelerating again, isn't going to give you really good fuel economy. I have monitored my real time mpg figures using a scan tool while driving and came to realize that this method doesn't really give good fuel economy. Maintaining a steady speed on the other hand does.
Most new cars have fuel cut off technology that automatically cuts off fuel when a vehicle is coasting with high RPMS. This usually happens when going downhill. So shifting your gear to N will take away this function. In N, the ecm will still inject small amounts of fuel to keep the engine running while if it was in D, the momentum of the tires and crankshafts linked together by the gear will keep the engine ticking but without using any fuel. The fuel cut off is usually around 1500 rpm on most cars. When going downhill, leave your gear in drive and take ur foot off the accelerator. It gives you engine braking, fuel cut off and enough time to react if anything goes awry.

Its even better to turnoff your engine at high speeds to save fuel.
The logic is,
switch of your car at speed,
Lock your steering and breaks,
Have an accident,
destroy your car,
No car, no need to buy fuel.

Trust me this is a smart move and its a lot cheaper than a New transfer case for your transmission.

.

My own question to the OP is why did you buy a car with Automatic Transmission when you wanted to enjoy coasting as done with the Manual Transmission??

You choose one, you loose the other.....Can't eat your cake and have it back.

Merde!!!

Thank you all for your smooth reply, but the reason why I asked this question was to learn, I have never pulled my transmission from D to N on speed I just asked a question inorder not to join the band wagon of transmission abusers.

But a well explained reply will still be appreciated from guru's in the house.

Always learning new things about cars everyday whenever I visit Car talk...
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