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Interesting acceleration anomaly today

Recommended Posts

2004 986 Tiptronic 2.7


Beautiful day today and towards the end I decided to try something I haven't done very much. There are some stop lights on the highway near where I live and being first in line, wanted to do a little brake torque start on the green light.


The Tip was in Manual mode, which is how I normally drive it, and was in first gear. I held the rpm at about 1500 for a second then simultaneously released the brake and pushed the throttle to the floor. Normally the computer will shift from first to second at a little over 6700 rpm (as logged by Durametric), but this time was very different! It shifted somewhere around 5200 or so - it took me by surprise so I'm not 100% sure - and really powered into second with a lot more oomph, then it felt like the engine had a lot more power than normal and revved more quickly than normal and then shifted early into third. The car felt quite a bit quicker 0-60 than I'm used to.


So my question is - what happened?


Did the torque converter not lock at all through second gear allowing more revs per mph than what it would be when locked?


Did the brake torque put the system into some kind of launch mode that changed engine mapping for increased power? (Doubtful)


Was a UFO using a tractor beam to pull me along? (Also doubtful, but I wasn't looking up so . . . )

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