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Can we shift to Neutral while down-sloping?

Discussion in 'Technical' started by Naughty, Jul 16, 2012.

  1. puntojith

    puntojith

    Messages:
    37
    Hyderabad
    Incidentally, is there any problem if the vehicle switches off in neutral?? I remember reading somewhere that the power steering or the brakes stop functioning if the car switches off in Neutral! Is this true??
    please let me know. Thanks.

    -puntojith
  2. SoumenPaul

    SoumenPaul Regolare

    Messages:
    325
    Bangalore
    Most horrific of all, irrespective of in gear or in neutral never let the car switched off while driving in any condition, brakes becomes hard and steering also becomes manual due to no power assistance (it might be active after switch off for a moment but eventually power assist goes off).

    I have heard of stories how the steering locked after driver turned key to switch off the vehicle in slope and accidents due to this !!!
    Last edited: Jul 17, 2012
    1 person likes this.
  3. Ganges

    Ganges Esperto

    Messages:
    3,121
    Driver Seat _/
    :
    Grande Punto 1.3
    one need to be very careful while driving in ghat sections,taking care of others safety makes yourselves in safer zone means dont do overtaking in ghats,however we see this happening :D
    During uphill sometimes 2nd gear also wont work when u slowed down completely,you need to shift to first gear.
    i would say a person driving in city,empty roads,highways is not same as driving in uphill or downhill areas,he/she needs to have one or two experiences to know his/her car very well about its pull capacity,handling and how to play with rpms in such uphill/downhill areas,these all dynamics ensures that your are not letting down your engine to go off, ultimately affecting steering and hard clutch pedal which is very dangerous.
    1 person likes this.
  4. vijays777

    vijays777 Regolare

    Messages:
    416
    Chennai
    Chennai
    Linea T-Jet
    Never keep in neutral in slope always engage a correct ratio gear because 50 to 70 of load is shared to engine while braking which minimises the wear and tear to brakes also gives you a good braking. if your complete load is in brakes after some time your brakes will get heated which leads the front brakes to fail as its disc its too risky.

    This situation will happen even if we are in gear mode , it all depends on the person behind the wheel , so in mountains drive with max load on engine and apply correct amount of braking to be on safer side.

    IN diesel engines we can do with gear braking meaning when you take your leg off the accelerator it will try to slow down fast the car which will be good , but in petrol oh no actually it will run than the normal speed of existing one.

    think petrol guys have experienced this more :)
    Last edited: Jul 17, 2012
  5. pammuluvcars

    pammuluvcars Regolare

    Messages:
    262
    IN
    Never ever do that.
  6. PatchyBoy

    PatchyBoy Esperto

    Messages:
    2,438
    Bangalore
    • When going down hill, if a gear is engaged, then the wheels will have to turn the engine. Therefore you will have better control
    • When you brake while going downhill, if the car is in neutral, the brakes will have to really work hard to stop all that force, especially with heavier cars
    • As pointed out by others, the brakes will overheat causing brake fade and will fail / lose their stopping power when you need it the most
    • Turning off the engine altogether is a sure fire way of crashing. You will neither have power steering, nor power brakes. Both will be manual and a lot harder. Try operating without turning on the ignition on level ground and you will know.
    • Turning off the ignition AND removing the key is 100% suicide on a ghat section, for the simple reason that your steering wheel will lock. So you will be headed towards a cliff, with no way of correcting the car's direction and not enough power to brake.
    If anyone wants to kill themselves driving down a ghat, please get yourselves some other non-FIAT car for that mission. I am sure your FIAT will be in more loving hands after you are gone :D

    Rajan
    Last edited: Sep 4, 2012
    3 people like this.
  7. mchanna

    mchanna Superiore

    Messages:
    989
    Pune
    Last edited: Dec 3, 2013
  8. s.rahus

    s.rahus Novizio

    Messages:
    27
    Chennai
    This is a classical "bad example" or "don't"s in driving. As Ravi rightly said the rule of the thumb is to drive downhill in the same gear the car would drive uphill (Ask any good old driver, he will tell you the same thing).

    The reason being that in this method the tyre speed is controlled by engine (engine break) and most of the time you will be moving downhill at the right speed, and if you want to further slow down you can always use breaks; so now that is dual breaking, one from engine and other from break pads in this way you have a better control over your vehicle.

    Trucks used to have a dedicated engine break (on the floor shaped like a thick round disc) between the clutch and break pedal to slow down the engine rpm thereby slowing down the vehicle. These days it is integrated into the normal breaks of the trucks it seems (not 100% sure though).
    1 person likes this.
  9. PatchyBoy

    PatchyBoy Esperto

    Messages:
    2,438
    Bangalore
    What exactly is the logic behind wanting to shift to neutral while going down hill? I assume it is the misconception that one will be saving fuel. Lets see how far that is true.

    When rolling downhill, if one engages neutral, then the car will be rolling downhill, assisted only by gravity, but the engine will be running and will be using fuel to keep the alternator going to generate enough power to charge the battery and supply the other accessories like your ICE, AC, etc.

    However, if a gear is engaged and the clutch released, of course, then the car will continue downhill, with the gravity still at work and the wheels now transferring the momentum to keep the engine going. Ideally, the wheels will now be turning the gears, the flywheel and the camshaft and in turn the pistons. This will in reality consume close to zero fuel and is a far more efficient - not to mention safer - way of driving downhill.

    Rajan
    6 people like this.
  10. mchanna

    mchanna Superiore

    Messages:
    989
    Pune
    Rajan Sir, I completely agree with you. modern engines have this fuel cut off when we take the foot off from pedal.
    Small doubt though, how does torque play the role here?

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