[graaja]

Originally Posted by Sutripta

Are you sure about the wet clutch in AMTs?

Regards
Sutripta

Now that you ask, I am not 100% sure. I was under the impression that except for some gearboxes which are dry clutch boxes, all the other gearboxes have oil bathed clutch.

[Sebring]

I've seen AMTs heat up. In fact they heat up a lot, due to the mechanical action being more. Even on TeamBHP I have come across these reports. On the hills you can always see the AMTs take a breather.

Originally Posted by mxx

My question is, why is AMT not prone to such overheating? If I am not mistaken AMT also has mechanical gears and clutches like DSG. Hence the question.

[Reinhard]

Originally Posted by Sutripta

Are you sure about the wet clutch in AMTs?

Originally Posted by graaja

Now that you ask, I am not 100% sure. I was under the impression that except for some gearboxes which are dry clutch boxes, all the other gearboxes have oil bathed clutch.

As long as the donor car's transmission is conventional and has clutch in oil - its a wet clutch AMT isn't it? AMT makes absolutely no change to the actual transmission. Just that the actuation is done via electronic and hydraulic drives instead of a driver pulling and pushing around link arms and cables. So if a manual car has wet clutch - its AMT variant has a wet clutch too. Pretty much most economy car AMTs around us are wet type I believe. AMT in our country is mainly for "cheaper" automatic. That means its applied in simpler conventional wet-clutch transmissions and not advanced dry clutch cars.

[Sutripta]

Originally Posted by Reinhard

Pretty much most economy car AMTs around us are wet type I believe.

Could you list out a few cars with wet clutches.

Regards
Sutripta

[Reinhard]

Originally Posted by Sutripta

Could you list out a few cars with wet clutches.

You don't need to play man! If all commuter cars are dry clutch you can simply say so eh?

[Sutripta]

^^^
Fast changing technology. One never knows.

Normally motorcycles have wet clutches, manual gearbox cars - SDP - single dry plate.

Leosashi - he of the Maruti parts catalogue and workshop manuals to the rescue then.

Regards
Sutripta

[graaja]

Originally Posted by Sutripta

^^^
Fast changing technology. One never knows.

Normally motorcycles have wet clutches, manual gearbox cars - SDP - single dry plates

I checked with some friends. And you are right. The gearbox in most of the cars come with dry clutch. Only the DSG boxes that handle high torque come with wet clutch.

So I was under the wrong impression. Apologies

[Reinhard]

Thats a revelation! Then does it mean that our average Joe (me!) is better at clutch modulation than the DSG? How come the DSG dry clutch suffered so much in creep conditions (off late seems to be better though)?

There are still sporadic reports of Hector DCT, Polo GT TSI etc showing high transmission temperature warnings in traffic conditions.

[graaja]

Originally Posted by Reinhard

Thats a revelation! Then does it mean that our average Joe (me!) is better at clutch modulation than the DSG? How come the DSG dry clutch suffered so much in creep conditions (off late seems to be better though)?

There are still sporadic reports of Hector DCT, Polo GT TSI etc showing high transmission temperature warnings in traffic conditions.

It seems so. I think human logic is still far better than a DSG as far as clutch modulation goes.

I have seen so many instances of clutch wear in the Polo GT TSi at less than 50k kilometres.

[Sutripta]

A slipping clutch (half clutch for us humans) will generate heat. If creeping forward involves a slipping clutch, and creeping time is significant, you are in trouble.
Not just DSGs. Maruti AMTs develop problems with clutch judder.

Regards
Sutripta

[audioholic]

After having driven these automatics both in India and Germany, I have concluded and will stick to the Torque Converters. The very reason for this is, TCs have improved a great deal over the last few years and can no longer be attributed to being inefficient, sluggish, etc and are proven to last a long time, and can definitely stand more abuse than a DSG. However, it depends upon what is the benchmark used for these transmissions. I can never choose a 4-5 speed TC from Hyundai or Maruti instead of the 7DSG. Give me the 7 G Tronic from Mercedes and I would choose this instead of the DSG. But given the best of the category, I would choose the best TC over the best DSG

[Robocop]

I voted for DSG, as I currently own and enjoy every bit of driving with the Skoda Rapid TDi. Driving experience is similar to that of the BMW 328i which of course had superior dynamics and braking power, although was a naturally aspirated gasoline engine.

[mxx]

Originally Posted by Sebring

I've seen AMTs heat up. In fact they heat up a lot, due to the mechanical action being more. Even on TeamBHP I have come across these reports. On the hills you can always see the AMTs take a breather.

Thanks. If possible can you share some links of the same. I want to better understand the scenarios where these problems happen.


BTW, does that mean as far as DCT and AMT is concerned, both are equally prone to heating issues?

[Sandeep500]

Torque converters have improved a lot and considering reliability they score above DSG. Amt,s are way inferior than the both above.

[NICHE]

My preference is in the order - TC, CVT, DCT, AMT.
TC is the first because I consider it as the real / original autobox.
CVT is okay but the disadvantage of rubber band effect weighs more than the advantage in FE.
DCT is not yet proven.
AMT is just work around solution.