tiptronic transmission shifting

[almoncius]

Hi Everyone,

I was wondering if someone already had this issue with their car: I have a 2006 Carrera 2, with 18000 miles on it, and in high rpms it shifts upwards slowly, downwards it is fine and quick. Does anyone know what might be the issue and how to fix it (the diagnostic computer did not show any faults)

[alpine-al]

I think that I was wondering the same thing when I first took my 2007 C2 for a test drive. Here's what I dug up.

Here's an excerpt from the owner's manual:

"Unwanted upward shifts, e.g. before bends, are prevented by swiftly releasing the accelerator pedal."

And, here's an excerpt from the sales brochure:

"In contrast with conventional automatic transmissions, Tiptronic S

will not perform an upshift before

entering a corner, only to

shift

down on exit because the speed

has dropped off. This assists

smooth

and uninterrupted

acceleration out of corners.

Mid-corner gearshifts are also

prevented, thereby

enhancing

stability and safety."

Hmmm... this is not my father's Oldsmobile.

Edited March 14, 2012 by alpine-al

[almoncius]

this is the issue: it always upshifts slow even in manual mode while in 7000 rpms

[RFM]

Are you sure the tire and wheel sizes are conform, Tiptronic gearboxes are very sensitive to such matters. The programmed shift diagrams are than no longer match.

[almoncius]

235/40-18 265/40-18 these are the tire sizes on the original wheels, maybe somoene has any other suggestions I should check

[RFM]

You'd also perform an oil and filter change as inexpensive solution, you name it "shifts upwards slowly" but is that really true, has already an experienced person driven the car? Keep also in mind that it is a Tiptronic and no PDK.

[alpine-al]

I can't speak for the orignal poster, almoncius. After reading that his Tiptronic upshifts slowly when in manual mode above 7000 rpm, I suspect that his car might have a problem.

By design, in automatic mode and at higher RPMs (like above ~ 5500), when the driver lifts his foot off the accelerator pedal, the Tiptronic S does not upshift (say from 3rd to 4th) for several seconds. As a result, the RPMs will be high and drop off gradually and then it will upshift after several seconds (unless the driver stomps the accelerator again). This is by design. It's not a malfunction. And, if you are used to driving with a conventional automatic transmission, it might feel and sound very strange. In contract, a conventional automatic transmission will upshift right away when the driver lifts his foot off the accelerator pedal.

[PAULSPEED]

The tires shoud be 19 and not 18.

See if you can test drive another similar car.

Paul

[Loren]

The tires shoud be 19 and not 18.

See if you can test drive another similar car.

Paul

That is incorrect - his tire size ARE approved tires for his car.

Please check the 997-1 TSB 28/08 4440 Approved Summer Tires, Wheels and Spacers (C2, C2S)