A/T transmission

[amrodin]

ask ko lang po mga master hindi ba masisira yung transmission pag D to N
lage while the car is still running.
ginagawa ko madalas yun lalo na pag pa approsch sa hump or mag preno ako base kasi sa expirience ko mas malakas mag preno pag naka N.
anu po kaya tingin niyo mga master? tnx sa mag reply! god bless and more power

[tanatej]

I suggest you shift to N only on a full stop as from what I've read, coasting on N on an A/T car will shorten transmission life.

[batangtalyer]

tama... para tumagal pa ang life ng tranny mo. may engine breaking naman yan eh.

[ericbalajadia]

Coasting will not harm the transmission because it will just cut the fluid supply off but generally, it's considered bad practice and unnecessary to do such. Now, accidentally shifting to reverse while in drive will.
Before the prevalence of A/Ts, manual drivers often do that instead of downshifting to anticipate stalling and save on gas but in doing so, lose the engine's braking capability and control.
I'm not that aware of the brakes being stronger while in neutral; maybe it is, because there's no more forward thrust coming from the engine but if there really is a marked difference between braking in neutral and drive, then something is wrong with your brake system.

[oj88]

Frequently shifting in and out of N may add wear to the clutch packs. Just keep it in D unless you will be standing still for a significant amount of time.

Braking is perceived to be weaker in D because the car has a natural tendency to creep forward while in any forward gears (or reverse if in R).

Coasting in N is also not a good practice (it's even illegal in some countries). It wears out the brakes faster, heats them up quicker, and if you're driving a fuel-injected car, it does NOT save fuel.

[niky]

Frequently shifting in and out of N may add wear to the clutch packs. Just keep it in D unless you will be standing still for a significant amount of time.

Braking is perceived to be weaker in D because the car has a natural tendency to creep forward while in any forward gears (or reverse if in R).

Coasting in N is also not a good practice (it's even illegal in some countries). It wears out the brakes faster, heats them up quicker, and if you're driving a fuel-injected car, it does NOT save fuel.

Correct: coasting in N won't turn off the fuel injectors... coasting in D will.

BUT: it won't wear out your brakes. In fact, when coasting down to a stop, you can use less brakes because of the lack of "creep".

[oj88]

Correct: coasting in N won't turn off the fuel injectors... coasting in D will.

BUT: it won't wear out your brakes. In fact, when coasting down to a stop, you can use less brakes because of the lack of "creep".

I agree, I just failed to make the distinction . What you say is true with low-speed coasting (ie. <20 kph). But shifting to N while still moving at a considerable speed would bypass engine braking, forcing the brakes to take up the momentum on their own. This is amplified when coasting downhill.

[amrodin]

so mga master sa madaling salita di po mag tatagal yung tranny ko pag ganun lage ginagawa ko? tnx sa mga nag reply

[niky]

It won't destroy your transmission outright. In fact, I've yet to see a transmission destroyed from frequent shifting to "N".

BUT: There is no real reason to do this frequently. Best is to leave it in "D" until you come to a stop and switch to "N" only if you have to wait at a traffic light or in traffic for a half-minute or more.

I agree, I just failed to make the distinction . What you say is true with low-speed coasting (ie. <20 kph). But shifting to N while still moving at a considerable speed would bypass engine braking, forcing the brakes to take up the momentum on their own. This is amplified when coasting downhill.

Well... downhill, definitely a no-no, whether MT or AT. Coasting at speed... depends on the situation. I hypermile, and I sometimes neutral coast if the situation demands it. At higher speeds, you get negligible engine braking with modern transmissions, because they're set to default to the highest gear possible at highway speeds.

[ericbalajadia]

And besides, it defeats the purpose of why the "automatic". One of the reasons for designing such transmissions is to free both hands from frequent shifting so the driver can concentrate more on steering. More and more controls are redirected to the steering wheel; shifting, radio etc.
Moreover, if you're coasting on N and suddenly have to veer away fast to avoid hitting someone or something, the seconds it would take to shift back to drive, not to mention the presence of mind to do so would be crucial.

[lazyfoot]

Frequently shifting in and out of N may add wear to the clutch packs. Just keep it in D unless you will be standing still for a significant amount of time.

Braking is perceived to be weaker in D because the car has a natural tendency to creep forward while in any forward gears (or reverse if in R).

Coasting in N is also not a good practice (it's even illegal in some countries). It wears out the brakes faster, heats them up quicker, and if you're driving a fuel-injected car, it does NOT save fuel.

Shifting in and out of D and N also contributes to the destruction of engine mounts

[oj88]

Shifting in and out of D and N also contributes to the destruction of engine mounts

I disagree. It should not amount to any more damage than engaging and disengaging the clutch on a manual.

[ericbalajadia]

To add, the mounts are stressed already even when shifting from P, so during coasting the mounts would be just working around their normal function.

[desert fox]

Kaya Automatic ang tawag....wag malikot sa kambiyo......baka mahuli ni misis... jk.

[ericbalajadia]

Kaya Automatic ang tawag....wag malikot sa kambiyo......baka mahuli ni misis... jk.

Hehe.. Sometimes, it's just a force of habit. When I was new to automatics, I used to move my left foot a lot which felt very uncomfortable doing nothing. When I learned to relax it, it's my right hand naman that yearns to do "something"! Now, I just rest my hand on the lever from time to time.
Really, there is no need to coast, one can only be just justify the habit saying brakes are stronger ( I probed it, driving at 20 and 40 kph in N and D and brake-effort difference is negligible ) or it saves gas ( which it doesn't ).

[imperialv]

naala ko tuloy, may kilala akong driver ginawang M/T ang A/T...

Every time he drives, he will start at 1 then, 2 and D...

hehehehe..


M/T

[ericbalajadia]

Now, I don't know the logic of some, like BMW to incorporate an option in their automatic transmission to have manual shifting?! Maybe the best of both worlds?

[oj88]

naala ko tuloy, may kilala akong driver ginawang M/T ang A/T...

Every time he drives, he will start at 1 then, 2 and D...

hehehehe..


M/T

Actually, it's in the manual na pwede gawin yan if you want to emulate M/T.

Now, I don't know the logic of some, like BMW to incorporate an option in their automatic transmission to have manual shifting?! Maybe the best of both worlds?

Yes, definitely. There are situations where the driver wants full-auto and just kick back, and then there are situations where they want to change gears in their own terms.

[desert fox]

Hehe.. Sometimes, it's just a force of habit. When I was new to automatics, I used to move my left foot a lot which felt very uncomfortable doing nothing. When I learned to relax it, it's my right hand naman that yearns to do "something"! Now, I just rest my hand on the lever from time to time.
Really, there is no need to coast, one can only be just justify the habit saying brakes are stronger ( I probed it, driving at 20 and 40 kph in N and D and brake-effort difference is negligible ) or it saves gas ( which it doesn't ).

Ano ba yung tawag sa pang exercise ng kamay bro? parang hand grip yata yun, i have that inside my car, once in a while ganun lang...

dito nga sa Saudi, kakatuwa (use your imagination na lang),

kaliwang paa, nakapatong sa door panel malapit sa side mirror, isang kamay nakacellphone....

hanep.

[desert fox]

Now, I don't know the logic of some, like BMW to incorporate an option in their automatic transmission to have manual shifting?! Maybe the best of both worlds?

not only BMW bro, mga makabagong sasakyan halos meron na yan...

Sportronic....pwede AT/MT..

Yung iba, me Paddle shift na parang F1 na....

Naenjoy ko Sportronic, di na kailangan ang clutch pedal, kung hanggang saan RPM mo ibirada sasakyan depende na sa iyo with a little push on the gear stick.

Halimbawa, nakalimutan mo magchange gear,mataas na at critical na sa engine ang RPM at naka Sports mode ka , kusa siya magshift para sa iyo....

Kung relax mode ka, lagay uli sa D.....