anyone knows how is difference beteen gear"D" and gear"S" and how does gear"S" work?
thanks for help

It just changes the up and down shift points

I know it is coverd in your owners manual also

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Based on my 2006 A3 with DSG, "S" mode changes gears up in around 4000 rpm under the normal acceleration. This, of course, depends on how you send gas to the motor, though.
But be careful. When you dash agressively from the standing position in "S" mode, you surely have to handle wheel spins thanks to the high torque generated by 2.0T FSI.

Have a safe driving...

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2006 A3 2.0T DSG Lava-Gray/Gray
Premium-Cold-Nav-Sound-BiXenon

Yeah "S" mode in the DSG is way more aggressive then a regular trans

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I would say DSG is the most advanced transmission technology we can get in the market !!

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2006 A3 2.0T DSG Lava-Gray/Gray
Premium-Cold-Nav-Sound-BiXenon

And you just wait the 7 speed DSG in the Bugatti that does 250mph you bet your *ss it finds its way into one of our cars

Oh man that will be sweet

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I reject reality, and substitute my own