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  #1  
Old January 12th 05, 02:36 PM
Tony
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Default DSG

Hi, I took a test drive in a Golf fitted with a DSG, very impressed. I
believe the gearbox uses 2 mechanical clutches instead of a torque
converter.I noticed that as soon as drive is engaged the car starts to
creep forward just like an auto with a torque converter. My question is
if the gearbox uses mechanical clutches then surely they will wear out
prematurely, especially if leaving the car in drive when sitting at
traffic lights.Is this the case or am I missing something?

Thanks
Tony
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  #2  
Old January 12th 05, 10:52 PM
Randolph
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Tony wrote:
>
> Hi, I took a test drive in a Golf fitted with a DSG, very impressed. I
> believe the gearbox uses 2 mechanical clutches instead of a torque
> converter.I noticed that as soon as drive is engaged the car starts to
> creep forward just like an auto with a torque converter. My question is
> if the gearbox uses mechanical clutches then surely they will wear out
> prematurely, especially if leaving the car in drive when sitting at
> traffic lights.Is this the case or am I missing something?
>
> Thanks
> Tony


One difference is that whereas a manual transmission uses (I am sure you
can find exceptions) a single dry plate clutch, the DSG uses two wet,
multi-disk clutches. See illustration at
http://www.moller.no/photoalbum/view/?size=org&id=1591
  #3  
Old January 13th 05, 08:45 AM
Tony
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Default

Randolph wrote:
>
> One difference is that whereas a manual transmission uses (I am sure you
> can find exceptions) a single dry plate clutch, the DSG uses two wet,
> multi-disk clutches. See illustration at
> http://www.moller.no/photoalbum/view/?size=org&id=1591


That helps to explain, I suppose wet clutches are less prone to
overheating and wear.
Tony
  #4  
Old January 13th 05, 08:37 PM
SFC
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Default

I wonder how it know's what (next) gear i'm going to choose......

SFC

"Randolph" > schreef in bericht
...
>
>
> Tony wrote:
>>
>> Hi, I took a test drive in a Golf fitted with a DSG, very impressed. I
>> believe the gearbox uses 2 mechanical clutches instead of a torque
>> converter.I noticed that as soon as drive is engaged the car starts to
>> creep forward just like an auto with a torque converter. My question is
>> if the gearbox uses mechanical clutches then surely they will wear out
>> prematurely, especially if leaving the car in drive when sitting at
>> traffic lights.Is this the case or am I missing something?
>>
>> Thanks
>> Tony

>
> One difference is that whereas a manual transmission uses (I am sure you
> can find exceptions) a single dry plate clutch, the DSG uses two wet,
> multi-disk clutches. See illustration at
> http://www.moller.no/photoalbum/view/?size=org&id=1591



  #5  
Old January 13th 05, 10:17 PM
Mike Smith
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Default

SFC wrote:

> I wonder how it know's what (next) gear i'm going to choose......


Your only choices are the next gear up, or the next gear down. (The "S"
is "DSG" stands for "sequential" - the shifter doesn't give you an
H-pattern where you can choose any gear.) I would imagine that if
you're accelerating, it assumes the next shift will be an upshift, and
vice versa.

--
Mike Smith
  #6  
Old January 13th 05, 10:50 PM
Randolph
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Posts: n/a
Default


Mike Smith wrote:
>
> SFC wrote:
>
> > I wonder how it know's what (next) gear i'm going to choose......

>
> Your only choices are the next gear up, or the next gear down. (The "S"
> is "DSG" stands for "sequential" - the shifter doesn't give you an
> H-pattern where you can choose any gear.) I would imagine that if
> you're accelerating, it assumes the next shift will be an upshift, and
> vice versa.
>
> --
> Mike Smith


Even if the next higher gear is already pre-selected, if what you want
is the next lower, the time needed change preselected gears would be
minimal. While this is taking place, you still have current gear engaged
and are getting torque to the wheels. So, the time penalty if the wrong
gear is preselected is probably insignificant.
  #7  
Old January 14th 05, 12:21 PM
SFC
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Default

I really love the 'simple' and clever design, typical vw/audi.

SFC

"Randolph" > schreef in bericht
...
>
> Mike Smith wrote:
>>
>> SFC wrote:
>>
>> > I wonder how it know's what (next) gear i'm going to choose......

>>
>> Your only choices are the next gear up, or the next gear down. (The "S"
>> is "DSG" stands for "sequential" - the shifter doesn't give you an
>> H-pattern where you can choose any gear.) I would imagine that if
>> you're accelerating, it assumes the next shift will be an upshift, and
>> vice versa.
>>
>> --
>> Mike Smith

>
> Even if the next higher gear is already pre-selected, if what you want
> is the next lower, the time needed change preselected gears would be
> minimal. While this is taking place, you still have current gear engaged
> and are getting torque to the wheels. So, the time penalty if the wrong
> gear is preselected is probably insignificant.



 




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