PDK Shift "sub-optimality" (Flare)
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Thread: PDK Shift "sub-optimality" (Flare)

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    PDK Shift "sub-optimality" (Flare)

    Out yesterday, I'd been driving spiritedly for maybe 45min/1hr. Lovely drive, great roads, little traffic. Not all-out 10/10ths, but properly enjoying the car (981C Base). I got to part of my route where the road narrowed, and I backed off to a more relaxed pace.

    It was then I noticed under very specific conditions some rev flare on upshift.
    -- Revs flared maybe only 50rpm or so - enough to hear as a rise, not the usual snap down, but not enough to feel or see on the tacho
    -- Only occurred on part throttle (say 30-70%) upshifts between 3000 and 4000 rpm. More or less throttle and all was well, higher or lower revs, again, all was well

    I then came behind some slow traffic for 10/15 mins, then everything was OK again (must have cooled down).

    I have noticed this once, maybe twice in the past. But it is obviously not that easy to replicate.

    --Has anyone else noticed anything other than shift-perfection, every time, from the PDK?
    --Is there a reset procedure I can do without the dealer? (It must be a calibration issue, not hardware, I feel)
    --Does anyone think it is worth the pain of taking it to a dealer (who wont be able to do anything cos they can't replicate it, but will manage to break something else...)

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    Re: PDK Shift "sub-optimality" (Flare)

    If you don't feel it or observe anomalous readings on the tach, what's the problem?

    Keep in mind that the transmission controller makes short-term adaptations to your driving style. Life on the roads around here consists of 99% soporific crawling and 1% fun. On the rare occasions when I can push the car a bit, the PDK's behavior in either mode, auto or manual, is noticeably different. After a few minutes' worth of driving in traffic, the behavior reverts to what I'm accustomed to.

    Your dealer can do nothing with the PDK except reset it, but I'm skeptical that will have any useful effects. Porsche doesn't allow them to take a wrench, a screwdriver, a hammer, or a soldering iron to it. This is a Good Thing.

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    Re: PDK Shift "sub-optimality" (Flare)

    I don't really think it is a problem in itself. And a calibration issue adjusting from spirited driving to something more relaxed could be the culprit - maybe it was indeed "fixed" as a result of re-adaptation, not any cooling down.

    But I wanted to hear if there were any other experiences. At one end of the spectrum maybe some folk would come along and say it's perfectly normal. Or some people may say "yep, mine did that and ended up completely broken 500 miles later" :-).

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    Re: PDK Shift "sub-optimality" (Flare)

    I don't expect perfection and sometimes I notice irregularities in shifting in my 1st gen 2009 car. The hardware and software are continuously attempting to get ahead of our next move and sometimes we can fool them but they recover quickly. I suspect either heat or adaptation mode and I wouldn't worry about it.
    2009 Cayman 2.9L PDK with a few tweaks
    PCA-GPX Chief Driving Instructor
    PCA Zone 8 TT/DE Chair
    PCA National DE Instructor

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