OCturbo

There have been discussions previously regarding the difference, if any, of using pdk sport when manually shifting with the paddles. The owner's manual does not give a clear explanation regarding this. The past few days I have been experimenting with this and I can feel a difference when pdk sport button is pressed when the rpm's are over 8k (I can't feel a difference bellow this). It seems like the shifts are faster and the car almost surges forward when you make a shift in pdk sport. Just curious what others think about this? For the first 6 mo, I almost never used this feature, but now I find myself pushing 2 buttons after start up (exhaust and pdk sport).

bronson7

I totally agree. I drove the same for the first few months then I did the same, pushed the PDKs button in manual mode. I now also do the 2 button push at start up. Don't know for sure if its just my imagination or not but it does feel different.

Mike in CA

The only explanation I've seen in writing is in the technical introduction docs for the 991 GT3. These docs say that the "lightning shift" feature, which uses stored energy in the drivetrain to provide more rapid "torque enhanced" shifts, is implemented a) when PDK Sport is selected or b) whenever Manual mode is selected. To me, this means that pressing PDK Sport in manual mode is redundant.

I can't feel a difference when pushing the PDK Sport button when Manual mode is already being used, but others say they can. Maybe my brain is being influenced by my interpretation of what I read.

RFGGT3

Mike,
I agree. I have tried it and can't tell a difference. This tranny in PDK-S auto. is optimal on the track.

Ceepe

In my car, the "surge" during the shift is simply not there unless PDK Sport is on. The surge/push is kind of goofy to me, so I often leave it off. There is clearly a different nature to a manual shift with PDK Sport on and off.

Edit*, everything i wrote above is incorrect. Lol. I can't recall any surge in manual mode. Only when in Auto and Sport. I'm an idiot.

-eztrader-

I can't feel any difference.

Money2536

I agree with Mike.

bigkraig

always felt that with the sport button on and high rpm shifts under hard acceleration gave more of a slam into gear

Manifold

One source who seems to understand these cars well told me there's a very small difference in manual mode with PDK Sport on versus off, and advised me to leave it off on track. So that's what I do. I don't know if there's actually a difference, but if there is, I gather that it's indeed small. Different story of course in auto mode, where the difference is big.

shapiroeric

I can't feel a difference....I have enough trouble remembering to press the exhaust button let alone pressing 2 buttons anyways....I wish they defaulted to what the car was in when it was turned off....

sccchiii

Colonel Klink might have said...."I feel nu-ting"....

Alan C.

The one thing you can do with both sport and manual selected is get over revs recorded in range 1. Most feel it doesn't matter. The spread for range 1 is not very large. Also the tech bulletin says damage possible in range 1 which I don't believe was the case with previous engines and PDK.

Zulu Alpha

I can feel it. There is a "Surge" at high rpm when PDK Sport button ON in Manual mode.

ipse dixit

I think this (the "surge" you speak of) has more to do with the fact that you are anticipating the shift because you are doing it manually, yourself.

When in Auto, you don't really know exactly when the car is going to shift (whether it's above 8000, or somewhere else in the rev range).

OCturbo

I don't feel the "surge" as much when I'm shifting manually without pdk sport. Interestingly, it's a split vote (more no) regarding this topic. It would be nice to get a definitive answer from Porsche