Some questions on Auto Car.
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Hello,
just got a new auto car. previously drove a maunal car so it took a bit of time to get used to the auto. Just have a couple of questions,
Does auto cars have engine break? N would tt mean the same as manual car, as in just let go of the accelerator? I heard tt using engine break for auto car wears the engine out faster??
Also, at a long long long wait at the traffic light, would it be more advisable to switch to N, or just leave it at D?
Thanks!!!
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engine brake for auto cars are less prononced, because im sure u noticed, the moment u're off the brakes, there is a small amount of fuel going into the engine, hence the car starts moving when you get off the brake, even if you aren't on the gas yet.Originally posted by react81:Hello,
just got a new auto car. previously drove a maunal car so it took a bit of time to get used to the auto. Just have a couple of questions,
Does auto cars have engine break? N would tt mean the same as manual car, as in just let go of the accelerator? I heard tt using engine break for auto car wears the engine out faster??
Also, at a long long long wait at the traffic light, would it be more advisable to switch to N, or just leave it at D?
Thanks!!!
also, remember that in some auto cars, the software for the transmission may not be 100% effective, hence while u have have lifted your foot off the accel in 4th gear, but the transmission remains in 4th gear and does not downshift to 3rd or 2nd. as u know engine brake is less in a higher gear so that is a factor as well.
for the engine wearing out faster, it probably isin't true, but i would welcome any comments from anyone who can clear that up.
as for a long wait, leaving it in d or putting it into N is totally up to you. both ways are ok. in N, u need to shift it back into D b4 the lights turn green, so u have to pay attention, while in D, u must make sure u do not lift your foot off the brakes accident, so also must pay attention. -
For auto cars, frequent switching between 'N' and 'D' will cause the gearbox to wear out faster... So for traffic light situations, u r advised to leave it at 'D'
To do engine brake using auto cars, u can mk use of the overdrive... but bear in mind nt to use it excessively -
engine brake seldom kicked in for auto cars..that's y they have a harder brakers than manuel cars ..
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Comment from w2k_83 is also the same as what i read from magazine and asking the car mechanics.Originally posted by w2k_83:For auto cars, frequent switching between 'N' and 'D' will cause the gearbox to wear out faster... So for traffic light situations, u r advised to leave it at 'D'
To do engine brake using auto cars, u can mk use of the overdrive... but bear in mind nt to use it excessively
As for using overdrive mode... for overtaking i heard before... first time hearing to use it to slow down the car
downshift make the engine accelerate faster to cope with the initial high revolution from higher gear.
As my nick indicates, manual is better after myself driving a auto car now
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just use the foot brake for all types of brake lor... it's still cheaper to chnage your brakes pads anyway.
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i heard the same as well. for me, if i know i am likely to stop for more than 20 secs, i switch to "N" so as to save fuel; otherwise i leave it at "D". i never use engine brake unless i am going down a long slope - just switch to "2" or "L". when going up slope, no need to use "2" or "L" as what some ppl do. just step harder on the pedal and the car will go to lower gear automatically. overdrive OFF is for overtaking.Originally posted by w2k_83:For auto cars, frequent switching between 'N' and 'D' will cause the gearbox to wear out faster... So for traffic light situations, u r advised to leave it at 'D'
To do engine brake using auto cars, u can mk use of the overdrive... but bear in mind nt to use it excessively -
yes, when overdrive is off, the engine revs will increase, but the car will decelerate (unless the foot is still on the gas), as the gear ratio is different now.Originally posted by manualisbetter:Comment from w2k_83 is also the same as what i read from magazine and asking the car mechanics.
As for using overdrive mode... for overtaking i heard before... first time hearing to use it to slow down the car downshift make the engine accelerate faster to cope with the initial high revolution from higher gear.
As my nick indicates, manual is better after myself driving a auto car now
and yea, my future car will be a manual one; i'll love to have more control over my machine! -
yea true enough for smart transmissions. but read from somewhere (forgot from here or from the mags) that some transmissions may have trouble deciding on a suitable gear, so there may be troublesome re-engaging during the upslope climb. hence, engaging lower Ds will help make the transmission more decisive.Originally posted by y720:i heard the same as well. for me, if i know i am likely to stop for more than 20 secs, i switch to "N" so as to save fuel; otherwise i leave it at "D". i never use engine brake unless i am going down a long slope - just switch to "2" or "L". when going up slope, no need to use "2" or "L" as what some ppl do. just step harder on the pedal and the car will go to lower gear automatically. overdrive OFF is for overtaking. -
think there's a better chance of engine wear for autos leh bro. the point to consider is that the autos work on the principal of a torque convertor using viscous coupling to generate a turning effect. this means that the auto tranny is constantly "slipping" at a optimal level such that the engine doesn;t stall and the rpms remain reasonably low.Originally posted by HENG@:for the engine wearing out faster, it probably isin't true, but i would welcome any comments from anyone who can clear that up.
the downside of doing this as compared to a manual tranny is that the engine is always under a certain constant load whilst in the "d" position as it works against the torque convertor to maintain this condition. for a manual, the engine doesn't experience any load coz either the clutch is depressed or the tranny is in neutral (otherwise the car will stall wat) over prolonged periods, this would mean that a engine with manual tranny willl be subjected to less overall stress factors as compared with an auto equipped engine. -
ah.... so i'm guess that's y auto cars require higher maintenance than manual cars?
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Originally posted by tailslide:
u mean under engine braking? i mean under engine braking will engine wear out faster for auto car?
think there's a better chance of engine wear for autos leh bro. the point to consider is that the autos work on the principal of a torque convertor using viscous coupling to generate a turning effect. this means that the auto tranny is constantly "slipping" at a optimal level such that the engine doesn;t stall and the rpms remain reasonably low.
the downside of doing this as compared to a manual tranny is that the engine is [b]always under a certain constant load whilst in the "d" position as it works against the torque convertor to maintain this condition. for a manual, the engine doesn't experience any load coz either the clutch is depressed or the tranny is in neutral (otherwise the car will stall wat) over prolonged periods, this would mean that a engine with manual tranny willl be subjected to less overall stress factors as compared with an auto equipped engine.[/b] -
Using overdrive will cause the gearbox to downshift 1 gear (for my car its 3rd gear), if u step on accelerator, the power will come in for u to overtake, but if u step on brake it will allow u to brake very fast to a stop. I will use this method when i approach a traffic light junction at a high speed but need to brake fast in order not to beat the red-lightOriginally posted by manualisbetter:Comment from w2k_83 is also the same as what i read from magazine and asking the car mechanics.
As for using overdrive mode... for overtaking i heard before... first time hearing to use it to slow down the car downshift make the engine accelerate faster to cope with the initial high revolution from higher gear.
As my nick indicates, manual is better after myself driving a auto car now -
Hey react .... Welcome to the Lazy man's club ! (No offence to all who drive auto) I must admit that i am lazy thats why i choose an auto sunny over the manual one ... and it actually cost more .... but for some cases there is no choice over Auto or Manual.
1. If you are at the traffic light and want to switch to 'N' .. no problem ... it lightens the engine load especially if your car is fully loaded ... Dun put it to 'P' that will be stupid ....
2.if you want to engine brake , i agree with the rest use the O/D off switch ... it will go to high rev and wear the engine ...
3.Never Engine brake by going from 'D' to '2' ... it will MOST proberly over rev your car
4.NEVER rev high at 'N' then jam into 'D' if you want to wheel spin ... if you do that ... you can say 'bye bye' to ur gear box faster.
IF and it is IF you want to wheel spin ... throw your car to a reverse till it reaches about 20kph then jam it to 'L' or '1' for some cars, it saves the 'bye bye' from coming too soon ...
*my $0.02 again * -
interesting...one of these days i must give it a try (the braking part).Originally posted by w2k_83:Using overdrive will cause the gearbox to downshift 1 gear (for my car its 3rd gear), if u step on accelerator, the power will come in for u to overtake, but if u step on brake it will allow u to brake very fast to a stop. I will use this method when i approach a traffic light junction at a high speed but need to brake fast in order not to beat the red-light -
got some questions bout the OD in a nissan sunny. What does it do exactly?
When the O/D Off (Button on gear shift depressed) light lights up, the car seems to have more power and such, and when the OD Light (Button on gear shift not pressed) is off, the car seems to respond slower and pick-ups slower.
K...my questions are...which gives me more acceleration and more power? And which mode is more fuel-efficient? When should i use OD off, and when should i use OD on?
thanks in advance lar -
Hey hey hey Mer ... dun keep your OD off unless being challange ... O/D off means over drive off .. your gear will change at a higher RPM and that gives power packed acceleration ..... but kills your pocket (to petrol kiosk often) the other way if you want more pick ups and power when T-lights turn green is by shifting manually ... e.g. go to '1' then '2' then 'D' .... that will give slightly more power .... (dun be suprise u can even win a Lancer MR with this simple step!)Originally posted by mercur|al:got some questions bout the OD in a nissan sunny. What does it do exactly?
When the O/D Off (Button on gear shift depressed) light lights up, the car seems to have more power and such, and when the OD Light (Button on gear shift not pressed) is off, the car seems to respond slower and pick-ups slower.
K...my questions are...which gives me more acceleration and more power? And which mode is more fuel-efficient? When should i use OD off, and when should i use OD on? thanks in advance lar -
hey hey johncooper!
hmm i see...i always drive with the OD off...unless im going up slopes etc. i find that the sunny with OD on is not very good at its initial pick up...
hmm i heard of that manual shifting, but i remember being told that i should try not to switch gears when the car is moving (for auto cars) cause it'll wear down the gear box faster. is it true? -
hehe, missed out on this one.Originally posted by HENG@:u mean under engine braking? i mean under engine braking will engine wear out faster for auto car?
there's a few schools of tot for engine braking. some say that too much will stress your engine, others swear by it although there's no doubt that the majority of these are from the racing fraternity. the truth is, the engine doesn't go through any load under engine braking. loads only occur under the combustion cycle, when the engine is burning gas and pumping out power to move a car against it's weight. however, this is not the case when the car is slowing down under engine brakes. the only wear the engine will experience is the rubbing of the piston rings against the cylinder walls, which is perfectly acceptable if u ask me.
this i feel, does not really apply to auto cars as i understand, the engine is constantly putting in fuel even as u lift off the accelerator (ie no engine brake effect). notwithstanding the auto owner deliberately dropping to a really low gear.(which most auto gearboxes i know are incapable of) whether or not this causes more strain/wear on the engine has yet to be known (by me at least )