tiptronic ("S shift mode")
The short answer is: There is no need to let off the gas.
The long explanation is: The transmission is electronic--there's no actual direct linkage between the transmission shifter and the transmission itself as would be the case with a manual transmission. The shifter is merely a control that tells one of many computers what position you want the transmission in. The computer is what actually does the shifting.
That said, even in "S mode" you aren't really even directly controlling many shifts. For example, in S mode "4", you're not telling it to shift into 4th gear. You're telling it to shift into "4th range", meaning the computer will determine "the most appropriate gear in the range of first through fourth gears".
This generally has the effect of downshifting if you're already in a gear that's higher, or "allowing an upshift to take place under the right conditions" if you're currently in a lower gear.
The tranny is doing nothing different than it would do if you were just in "D".
-Dan
|