Auto car on neutral gear down slope

[Dumb]

Maybe in the near future car makers may include this as a feature. Auto disengage of transmission when going down a slope. LOL...

 

Since now a lot of cars have this function call start/stop to help on FC why not this one?

 

 

Somw in post #5 already said, no a single drop of petrol is burned if you lift off the pedal. I find that hard to understand. How could an engine be alive with a single drop of petrol.

[Watwheels]

Somw in post #5 already said, no a single drop of petrol is burned if you lift off the pedal. I find that hard to understand. How could an engine be alive with a single drop of petrol.

I forgot to put "sacarstic mode" lah.

 

Engine still have to maintain idle rpm, fuel will still be burning. To me it makes no difference.

[Deckbuild]

Auto car engine brake is minimal, dosen't make much of a difference. My concern now is whether will it damage the gear transmission in the long run..

 

 

Auto car engine brake is minimal because you let it be auto, try releasing the OD button or shift it to 2 at high speed and you will feel the engine pull.

 

Not sure about the CVT though

[Felipe]

Auto car engine brake is minimal, dosen't make much of a difference. My concern now is whether will it damage the gear transmission in the long run..

if u dun shift back into gear when moving, should be ok.

[Happily1986]

A mechanic from TCM said it is not recommended to push the gear to neutral while going down slope because when you shift back to drive mode, the gears wont have enough power to shift back properly?

 

why would you even think of slotting your gear selector into N before the vehicle descends a slope? for fuel savings?

 

there is a good reason why N is in between R and D shift selection. N is intended to disengage the torque convertor and the gearbox if you decide to switch between R and D. especially those tims when you think it's okay to switch from R to D or vice versa when the vehicle is in motion.

 

This is what N is meant for on the auto slushbox, not for you to freewheel your vehicle!

[ER-3682]

Maybe in the near future car makers may include this as a feature. Auto disengage of transmission when going down a slope. LOL...

 

Since now a lot of cars have this function call start/stop to help on FC why not this one?

The lastest Porsche 911's P.D.K. already got this 'coast' function,take your leg off the throttle it auto drop to idling speed.

[Terratoss]

I have been driving that way for more than 4 yrs and my mileage was 130k. No damage!!! And I had let my car roll on free gear for 7km at above 80to 130 kph a few times.

hm.. ok.. what car are you driving?

[Terratoss]

why would you even think of slotting your gear selector into N before the vehicle descends a slope? for fuel savings?

 

there is a good reason why N is in between R and D shift selection. N is intended to disengage the torque convertor and the gearbox if you decide to switch between R and D. especially those tims when you think it's okay to switch from R to D or vice versa when the vehicle is in motion.

 

This is what N is meant for on the auto slushbox, not for you to freewheel your vehicle!

Yes, I agree with you but now the issue is I am not sure if it is safe to do so or will it cause any damage to the transmission. I did experiment on it before and it give me an extra 70-100km yield on my per tank mileage. So If it is proven that it does damage the transmission, I wouldnt want to do that just to strech the mileage.

[Hamburger]

if u dun shift back into gear when moving, should be ok.

dont anyhow advice if you dont know.......

 

putting to N while car is cruising will fry the autotrans

[Deckbuild]

This topic have been discuss before, auto transimssion might over heated when moving in neutral.

[Seanboi]

Yes, I agree with you but now the issue is I am not sure if it is safe to do so or will it cause any damage to the transmission. I did experiment on it before and it give me an extra 70-100km yield on my per tank mileage. So If it is proven that it does damage the transmission, I wouldnt want to do that just to strech the mileage.

 

Shifting to N can yield you extra 70-100km of mileage?!

I would not do so for safety reasons (traction) unless it is a long straight road with little traffic.

[W124]

I did try that once - shifting to Neutral when the car was in motion...but stopped when I was advised that the transmission was going to take a lot of wear and tear when I shifted back into gear with the car moving

 

Actually if I was going down slope, I would step a little on the accelerator pedal just a bit above idling and let the car cruise. While the fuel savings may not be as great as leaving the gear in Neutral, I'm mindful that a gearbox overhaul costs thousands depending on the car model. And if the torques converter is damaged, that's a brand new unit being indented with separate freight charges. Torque converters are frequently sealed units and unlikely it can be overhauled (not in Singapore!) although I've heard some shops do cut it open and replace the bearings and gears before welding it back. How good the workmanship is is anybody's guess

[Xanavi]

I did try that once - shifting to Neutral when the car was in motion...but stopped when I was advised that the transmission was going to take a lot of wear and tear when I shifted back into gear with the car moving

 

Actually if I was going down slope, I would step a little on the accelerator pedal just a bit above idling and let the car cruise. While the fuel savings may not be as great as leaving the gear in Neutral, I'm mindful that a gearbox overhaul costs thousands depending on the car model. And if the torques converter is damaged, that's a brand new unit being indented with separate freight charges. Torque converters are frequently sealed units and unlikely it can be overhauled (not in Singapore!) although I've heard some shops do cut it open and replace the bearings and gears before welding it back. How good the workmanship is is anybody's guess

 

Hope it will help enlighten those who are penny wise, pound foolish..