Greetings all,

I have the before mentioned auto and am curious if you can assist. Second gear on this tiptronic model has a slight dip on the gearing around 40mph or so. It does not climb steadly but seems to climb level out for a moment then start taking off.

thanks for any comments.

1998
tiptronic
37k

 

Well, I think what you are describing is: your car starts out as you get on the throttle hard, and accelerates rapidly, and then at about 40 mph (or did you mean kph?) there is a dip in acceleration for a moment where it does not accelerate, and then it acccelerates hard again.

There could be two normal causes:

First, these engines have a variable cam and there is a noticeable dip in torque at around mid range where the profiles shift. that would be at somewhere around 40 mph in 2nd. But you have to be VERY sensitive to pick this up. I can't feel it in my car, although when I had it dynoed to verify output, the dip was there, just like the owner's manual shows.

If you are talking about this happening at full throttle acceleration, I imagine this is just the shift from 1st to 2ndgear. Since Tiptronics (at least mine) start out from a standing start in 2nd unless you really get on it hard (or drive it in manual mode and manually shift to 1st ever time you come to a stop) in normal driving you get used to thinking and expected that it starts in 2nd and stays in that initial gear quite a while, usually until about 60 (at full throttle: and I don't know the exsactly speeds because I am notfamiliar with the gearing on your specific car). But when you get on the throttle hardhard, the transmission automatically dips into 1st from a standing start, a gear it will then shift out of somewhere around 35 mph, into second, and there is a very noticeable pause in acceleration as it does so.