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Automatic transmissions (Read 3915 times)
Sprintcyclist
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Automatic transmissions
Oct 4th, 2020 at 8:08pm
 

Following from the amiable discussion on 4WDs I thought to start this thread.

Automatic transmissions, 90+ % of car sales are autos.

New Autos are great.
Some sales staff say Autos are 'sealed' and required no maintenance for the life of the car.

Well, depends on how long you want the life of your car to be !
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Re: Automatic transmissions
Reply #1 - Oct 4th, 2020 at 8:16pm
 
Sprintcyclist wrote on Oct 4th, 2020 at 8:08pm:
Following from the amiable discussion on 4WDs I thought to start this thread.

Automatic transmissions, 90+ % of car sales are autos.

New Autos are great.
Some sales staff say Autos are 'sealed' and required no maintenance for the life of the car.

Well, depends on how long you want the life of your car to be !


Hyundai? Apparently that's bunk.
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Re: Automatic transmissions
Reply #2 - Oct 4th, 2020 at 9:05pm
 
Modern Automatic transmissions are quite complicated really.

The amount of info they use to decide when to shift up or down is far more detailed than the old days.

However, in some ways they are quite "crude" ... imagine having a magnet in there to "suck up" all the fine metal filings that occur from normal wear inside ... that hasn't changed for yonks.

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Re: Automatic transmissions
Reply #3 - Oct 4th, 2020 at 9:39pm
 
Currently driving an auto for the first time in 4 decades.

Travelling 200K per day my left knee loves it - the rest of me hates it. It is good though.
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Re: Automatic transmissions
Reply #4 - Oct 4th, 2020 at 9:53pm
 
Captain Nemo wrote on Oct 4th, 2020 at 9:05pm:
Modern Automatic transmissions are quite complicated really.

The amount of info they use to decide when to shift up or down is far more detailed than the old days.

However, in some ways they are quite "crude" ... imagine having a magnet in there to "suck up" all the fine metal filings that occur from normal wear inside ... that hasn't changed for yonks.



I thought new autos were amazingly complex.
What do they have, 8 gears?
they change range within 0.2 of a second !!
the efficiency and smoothness of them is pretty much perfect.

I have an old 5 speed auto with 270,000 kms on it.
It's runs very well, quite complex.
Newer 6 or 8 speed autos kick it out of the ballpark.
You could not sell it nowadays.
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Re: Automatic transmissions
Reply #5 - Oct 4th, 2020 at 11:15pm
 
Generally the life of an auto is reputed to be around 350,000k - one issue I have with computer controlled autos is the length of time it takes them to consider their options before responding to the driver... kinda reminds me of the auto-pilot and the pilot wrestling for control of the aircraft ...

When I hit the pedal to get out of a tight spot - I want instant response - not ...

"umm.. Effendi.... let me think about this for a moment or ten... lessee now - you hit the pedal hard demanding instant performance which requires a gear change for maximum benefit...... ummmmm ... I see no need for that.... we're not on a hill or anything.... ummm-arrrgh.... do you really think you should be doing this, Dave ...... after eighteen months I feel I'm entitled to an answer..... but you're the boss after all...........OK - have it your way you stroppy bastard trying to avoid that farken truck... just don't blame me if it hits u------------"...
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Re: Automatic transmissions
Reply #6 - Oct 4th, 2020 at 11:20pm
 
Dnarever wrote on Oct 4th, 2020 at 9:39pm:
Currently driving an auto for the first time in 4 decades.

Travelling 200K per day my left knee loves it - the rest of me hates it. It is good though.


I'm happy with cruise control - my old knees and such don't get such a workout..
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“Facts are stubborn things; and whatever may be our wishes, our inclinations, or the dictates of our passion, they cannot alter the state of facts and evidence.”
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Grappler Racist Filth
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Re: Automatic transmissions
Reply #7 - Oct 4th, 2020 at 11:23pm
 
Sprintcyclist wrote on Oct 4th, 2020 at 8:08pm:
Following from the amiable discussion on 4WDs I thought to start this thread.

Automatic transmissions, 90+ % of car sales are autos.

New Autos are great.
Some sales staff say Autos are 'sealed' and required no maintenance for the life of the car.

Well, depends on how long you want the life of your car to be !



Nooot really - they still should have the fluid changed etc... it's just that there are no inlet pipes or outlet plugs and you have to remove the entire casing from underneath and drain it, then refill it with difficulty.

My trannie (sic) fluid is a bit murky - no magnetic plug there - I want to replace it and put in Nulon etc to prolong gearbox life and make it smoother... but I need Nulon in the spine these days just to get down there, and without a plug draining is a messy job as is refilling without a pipe.

It's designed to keep mechanics in business over-charging at double the going real rate.
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“Facts are stubborn things; and whatever may be our wishes, our inclinations, or the dictates of our passion, they cannot alter the state of facts and evidence.”
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Re: Automatic transmissions
Reply #8 - Oct 4th, 2020 at 11:47pm
 
Dnarever wrote on Oct 4th, 2020 at 9:39pm:
Currently driving an auto for the first time in 4 decades.

Travelling 200K per day my left knee loves it - the rest of me hates it. It is good though.

So you travelling for work or adventure?
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Re: Automatic transmissions
Reply #9 - Oct 4th, 2020 at 11:52pm
 
Captain Nemo wrote on Oct 4th, 2020 at 9:05pm:
Modern Automatic transmissions are quite complicated really.

The amount of info they use to decide when to shift up or down is far more detailed than the old days.

However, in some ways they are quite "crude" ... imagine having a magnet in there to "suck up" all the fine metal filings that occur from normal wear inside ... that hasn't changed for yonks.


Really? That sounds really cleaver to me. But you know, I never had any aptitude for mechanical things.
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Re: Automatic transmissions
Reply #10 - Oct 5th, 2020 at 12:08am
 
The work car is manual transmission. I get to drive it as I am old enough to be one with a manual licence. I drive an automatic car for my personal car. Although it has some get up and go, it is not as powerful as other cars I have driven. But it can get moving when I floor it down the highway.
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Sprintcyclist
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Re: Automatic transmissions
Reply #11 - Oct 5th, 2020 at 2:55am
 
Grappler Racist Filth wrote on Oct 4th, 2020 at 11:23pm:
Sprintcyclist wrote on Oct 4th, 2020 at 8:08pm:
Following from the amiable discussion on 4WDs I thought to start this thread.

Automatic transmissions, 90+ % of car sales are autos.

New Autos are great.
Some sales staff say Autos are 'sealed' and required no maintenance for the life of the car.

Well, depends on how long you want the life of your car to be !



Nooot really - they still should have the fluid changed etc... it's just that there are no inlet pipes or outlet plugs and you have to remove the entire casing from underneath and drain it, then refill it with difficulty.

My trannie (sic) fluid is a bit murky - no magnetic plug there - I want to replace it and put in Nulon etc to prolong gearbox life and make it smoother... but I need Nulon in the spine these days just to get down there, and without a plug draining is a messy job as is refilling without a pipe.

It's designed to keep mechanics in business over-charging at double the going real rate.


' ............ they still should have the fluid changed etc..  ............ '  Yes

The 'new' 6 speed autos have no dipstick.
Very hard to change the fluid. I have watched a few youtubes, it is complex.

Someone might find and easy way, I hope.
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Re: Automatic transmissions
Reply #12 - Oct 5th, 2020 at 5:53am
 
theres no doubt a manual is cheaper and lasts longer.

again sprint , like the covid stuff...follow the money.

toyota have always had the reputation for longevity.

great for the consumer

terrible for toyota.

you really want built in redundancy now .

look at your apple i phone 10 or sansumg 20.

they want you buying the new model.

its good for the corporate profit.

the consumer has been sold on the idea that you turn a car over after 7 or 8 years. (i dont).

its environmentally very bad.

in order to force the consumer out of the car and into the new one, you need a catastrophic failure at about 7 years and thats the auto trannie in many cases.

some are made as sealed units, so they cant be serviced.

and you certainly cant rebuild a modern automatic transmission.

the "fixed price servicing" is also designed to ensure your car fails, just after the fixed price service period ends.

the engineers know you can stretch an oil change out to 20000 km like they do in the new navara.
they know you can seal the trannie and it will last 5 or 6 or 7 years.
the very high tech fuel injectors also cost 1000's to replace.
they know if they change the fuel filter every 40 , they will last longer, so they change it every 100.

they know you can put a timing chain on the engine that never breaks, so they put a timing belt on which inevitably breaks and then you have to junk the car.

the germans are very very cunning.

they put parts like starter motors in really inaccessible places, so you have to disassemble half the negine to replace it at a cost of maybe a 1000 in labour.
they put the fuel pump inside the petrol tank so you have to take the whole tank off the car to replace it.

they know that the plastics they put to hold the brake cylinders and the power steering assembly will fail and crack after so many cycles of being hot and cold...designed to fail after 5 to 7 years (depending on the warranty Wink).

with regards auto trannies specifically.

if you must have an auto (and increasingly you have no choice) do some research and dont get one made by Jatco.
try to get one you can service.

do NOT flush (that stirs up the particles and screws them generally).
do NOT try to service if it is not something you will do regularly. so if its done 200,000 and never been done, leave it alone, the bits of crud now are part of the working mechanism and if you remove them it will fail.

and above all, baby that transmission. nice gentle acceleration up hills especially if towing.

i do all my services twice as regaular as the dealers say.

in fact, never go back to a dealer (though they can be the best source of genuine parts if you can get friendly with a guy in their service department.

do your oil and filter every 10 k.

again , manufacturers are being pricks.
the new hilux has a system of nuts and bolts and retaining screws and difficult access just to change the dammed filter.

drop all the coolant out every 60 and replace.
the little bits of grit in the coolant are what wreck your head gasket.
do your air filter every 40 especially if its dusty.

change out your power steering fluid and you gear box, transfer case and diff oil every 80.

spray a good rubber protecting spray on all the hoses every 6 months

put your battery on the charger every year at least (modern cars only charge to 70 %) and they last better if you put a 100 % charge into them

buy yourself a generic scan tool on ebay ($100) and you can check all the codes and the data.

all the best.

i love driving 15 yo 4 wds that still go beautifully.

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Re: Automatic transmissions
Reply #13 - Oct 5th, 2020 at 7:27am
 
All oils degrade over time.

All transmissions cop a hiding.

The biggest enemy of transmissions and oil is heat.
If you have an auto and tow anything, you need to have the tranny oil changed regularly.

I have a 4x4, recently purchased.
The working temps for trannys and the oil therein should never exceed 130 degc.
The hotter the oil, the shorter the tranny life. THIS IS A KNOWN FACT
Seals, which are critical for the tranny to function, will start breaking down the hotter they get.
The oil starts to loose its lubricity and viscosity as it gets hotter, allowing wear and damage to parts.

I fitted a scangauge to my 4x4 when I purchased it to monitor key engine and tranny paramaters.
Towing my boat from the CC to Sydney, the tranny temp hit 110  a couple of times, the ideal temp for a tranny is 80 ish degc.
Tranny temps cooled less effectively than engine coolant temps.
The coolant hit 95 deg c on one hill but cooled very quickly once the hill flattened out.
(diesels run around 85deg c, petrol around 100 deg c)
The tranny took several kilometers to cool.

Autos are generally much better for off roading, but this will be argued by those traditionalists who like manuals.
But an auto can make changes far faster and more in line with engine demands than any manual.

I have my tranny oil changed every second service and a tranny cooler will be fitted when I get my caravan.

I worked with mining machinery for 30 years and these facts are known in that industry.
I have seen tha damage when the tranny oil dies and it aint pretty
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Re: Automatic transmissions
Reply #14 - Oct 5th, 2020 at 10:40am
 
good post valkie

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