C4S tiptronic Overdrive?

[brendel]

Hi everyone,

I have a C4S from 2006, in the morning I climb a hill to drive the kids to school, the speed is limited 30 KMH ( 20 MPH) the slope is regular and the road straight for about one mile, I climb the hill from cold start on the 2nd gear, when my car pass on the 3rd gear once it is a bit warmed up the revs go down one time and 2 seconds later a second time like 200 rev less while staying on the 3rd gear, It was always like this but I never really paid attention

It is not an issue but I was wondering if there is a kind of overdrive or something?

Thanks

[mxt_77]

Probably the lock-up of the torque converter. This decreases slippage with the primary purpose of helping improve fuel efficiency.

I did a google search and found a good post by Loren in the 996 forum. Unfortunately, I can't easily copy/paste from my phone, but maybe you can find it by searching for "tiptronic torque convertor lock-up".