Larry Cable

I wonder if the 991 MT pedal (instead of a GT3 variant which might be a very different part ... or not) could be directly substituted? Of course there would be NO
kickdown, but frankly I hate that feature anyway...

anyone got access to 991 PET catalog?

Larry Cable

my feelings exactly! any kickdown I have ever made the mistake of using always has that momentary surge to the redline ... its horrible and in my mind unusable in any situation other than in a dead straight line, and never ever on the track ...

if the 991 MT gas pedal could be plug-and-play substituted for in the PDK car I for one would do this and eradicate that feature forever, if I want a downshift I can always use the paddles ...

mschuster

The kick-down switch also kicks up. In Manual Sport mode, 1st gear, press the pedal hard to the floor but don't shift. On my test drive I found the car will auto up shift at redline through the gears. I expected manual meant manual not auto.. A light foot helps, but maybe replacing the kick-down spring with a stiffer substitute would help more?

Larry Cable

I wonder if that is a feature of the 'kick-up' switch or simply the PDK upshifting as it hits the redline?

stronbl

I have not experienced this "feature" in Sport Plus manual mode. I bounce off the rev limiter all day w/out upshift -- in Sport Plus auto mode, up shift at redline (rev limit) is built in and happens.

I have not tested same in Sport manual mode so that could be the difference.

Larry Cable

would anyone miss the kickdown switch if it simply disappeared I wonder?

I'm betting that it would be possible to switch out a MT accelerator pedal for the PDK version and eliminate the damn thing completely ... wiring harness is probably the same, the result of 'pressing' the kickdown would be a different signal to the ECU/DME ... no switch, no signal ...

Someone should order the part (I would if I had a car) and try it, if it doesn't work return the part!

mschuster

I read the switch is not a true switch, just a resistance device to provide feedback. Pedal position sensed electronically triggers the shifting behavior.

mschuster

Manual Sport also down shifts if you quickly tap the pedal, as long as the shift does not cause an over rev. My taps were light and quick, I don't think I hit the kick-down when this happened.

Larry Cable

ah crap...

Marc

Noah,

I did go the route of adding a tie wrap below the kick down sw. It works as planned and I have one less worry while at the track.

If I press really hard on the accelerator I can make it kick down, but this is a conscious effort, otherwise just pressing the accelerator with “normal” pressure it will not engage the sw.

Thank you for the advice

Vise

So I'd read about this a bit on 6speed but hadn't experienced in person on my car or the 991S I test drove extensively. Was doing some spirited driving today on the highway (light traffic) in Sport/Manual shift modes and was very surprised when a heavy stomp on the accelerator kicked it down to 2nd gear... as you can imagine on the highway going 65-70mph I was immediately up past 6k rpms and actually a bit stunned, took me a couple seconds to realize what had happened and shifted a few times to get back to a reasonable rev range.

I tested it again and with some practice I think I could avoid the kickdown but I must say I do not like it at all... its not remotely a deal breaker though, the rest of my drive was brilliant and the PDK performed like a champ. Plus the sound!

That said it is something I'd like to resolve/remove...

Not sure if Marc is still active but I'd be interested in understanding what exactly he did to prevent/block the kickdown switch from being activated. If I understand correctly it may actually be more about pedal travel than the switch itself but either way, if there is a simple fix that doesn't involve removing the pedal assembly I'm all ears!

Larry Cable

I personally think this is a BUG in the PDK system, I cant think of a situation while cornering that I would want a downshift (especially when I am in manual mode)

I'd love to know if swapping out the PDK accelerator pedal for the 7MT variant would get rid of the kickdown function completely... (this would only
work if the kickdown is a mechanical switch on the pedal assy ...)

Larry Cable

can you post a reference??

mschuster

Larry,

I don't remember the source, I think it was someone who removed the pedal assembly, posted photos, and showed that the switch is simply a resistance device with no electrical connection. As I mentioned, throttle position sensed electronically appears to an input to the shift computer system.

On my test drive, I found the kick-down switch will both down-shift AND up-shift depending on the situation, in Manual mode with Sport button engaged. I tried Sport Plus briefly, but decided it was a gimmick. With the car at the limit in the wet those abrupt shifts will cause a loss of rear traction and a spin. Do not try this in the wet at Road Atlanta accelerating downhill out of turn 12. But Sport Plus is fine for fun with the car below the limit, I suppose.

On my test drive I was impressed by PDK, and now after a year I am really glad I did not buy it. But what is with Porsche and this tall manual gearing?

Mike

Rocket_boy

What I see in PET,....."I250" is PDK car, "I487" is manual,.....so the all-in-one pedal is different between the two, but whether a switch or resistance device you would have to examine one up close and maybe even partially dismantle to tell the truth. There are no outside switches,....the pedal is a self contained entity.