Hi,

If there is anybody here who owns and races GT3/GT3 RS and also tried new TT with PDK on a track - could you voice your opinion of new TT car`s handling pls? I just was quite suprised to read in that issue of
Panorama of new TT considered by Walter Roehl as equal substitute of GT3 RS so it woul be interesting to hear from somebody who has first han experience with both cars.

Sorry, if this was already discussed point me to the thread as I did not find it.

thanks, Paul.

 

Interesting question, let's wait for some real life answers

 

I've driven the 997.2 S pdk on the track and it would take a very well driven gt3 to touch it, I can only imagine the turbo.

 

Wow, that's saying a lot considering the weight and horsepower advantage the GT3 has. I know PDK is good, but that good?

 

I've driven a 996 (street version) GT3 on the track several times and used to race a 996 GT3 cup car. While I haven't driven my new 997 TT PDK on the track, I've driven it just as hard as the 996 GT3 (street version) on some of the back roads around here (though not quite as hard as the cup car, due to lack of cage and nature of public roads).

Both of the 996 GT3s handled much better than my new 997 TT PDK. That said, the acceleration of the 997 TT PDK feels like it is more than enough to make up for the handling deficit (relative to the street version GT3) on any track. I don't think the 997 GT3s have enough incremental power to make up that gap.

So, bottom line, I think it depends on what you are after. On the track, the GT3 will handle much better and may "feel" somewhat more satisfying (though it may also be more prone to bite you in the butt), while the TT PDK will more than make up for its girth and softer suspension on the straights.

 

Remember, the pdk sport plus mode keeps the rpm's between 4-7000 all the time (always in the power band) with lightning fast shifts. The wt difference on a street gt3 vs a 997.2S is minimal. As for the HP differential, the 3.8DI motor is certainly torque superior while the HP is very close. Unless the gt3 is driven perfectly, the S pdk will take it 9 times outta ten on a road course, (both with cups) imo.
Yes, it's that good. Drive one and see for yourself, I did.

 

One question that I had in reference to the PDK. I know that these gearboxes have been upshifting at blistering speed, but what is the time delay on pulling the trigger and an actual down shift?

I have heard that there is a bit of a delay, is this accurate?

Thanks,

Erik Johnson
GBox Performance Transaxle
(303) 440-8899 work
(303) 895-4828 cell
www.gboxweb.com

 

Zero delay in up or downshifts !

 

Agree, zero delay.

 

My next TT will have the PDK and I know I can shift fast and maintain boost.

 

Not so in the car I'm driving...
Eric, I'm presuming you're asking about shifting manually.
At least, there is a noticeable difference in the speed of upshifts as opposed to downshifts. Upshifts are instantaneous while downshifts, even in Sport + mode, are fast but nowhere near as fast as upshifts.
If you are in Normal Mode, then the delay in downshift is even more noticeable.

If you have it in drive and Sport + mode though and you're not using the manual shifters, you find yourself almost 100% of the time in the right gear.
Upshifts are electrifyingly fast and downshifts happen brilliantly as you brake and the engine RPM decelerates such that you feel your connection with that car's PDK gearbox is telepathic.
Going into corners in Drive and Sport+, the PDK will hold the lowest gear that it got to during your approach braking and just before it detects the turn-in angle began, which should leave you in the right gear to exit out of the corner hard.

That's been my experience with my .2TT PDK.

 

One thing to keep in mind is that the PDK preselects the next gear, so upshifts are always instantaneous. But on downshifts, especially multiple downshifts it can take longer if the gear selected is not the one preselected already. Also the shift is slower due to the need for the ecu to match revs during the downshift.

So for instance the dual clutches packs traditionally have one for gears 1,3, and 5 and the other for gears 2,4, and 6 because the next gear is always on the next clutch pack it is always preselected and the one clutch packs disengages and in 8 ms the other one already is engaged.

So on the way down say if you in 4th gear and you click for one downshift which is already slower engagement due to needing to allow time for the throttle blip. Then you click down again after 3rd had already been preselected it has to go back to the clutch pack that was just waiting to hand off the power to the other clutch pack.

So its could be noticeably slower than the upshift but most of the time except for the situations above its quicker to downshift than a single clutch auto-manual. So normally upshifts are around 8 ms, downshifts 600 ms and the odd non preselected down changes as slow as 1100 ms.

 

Oh! That's why down shift is delay.

 

I drove the 2S PDK at the Porsche school. The instructors said the PDK was worth more in terms of track time than NA v. TT. Seriously.

I race bikes and don't like the PDK for a "sport car," but on the track, no question its significantly faster and easier. If you had to pay the rent from money you made racing, .. you'd have a PDK, I'm 100% sure.

 

Paddle shifting alone and being able to keep both hands on the wheel by itself is huge, and then you add in only 8 ms of tractive force being lost per shift which really is almost none. Then you add up the number of shifts and how much time is spent with the car not putting power to the ground and the effect is staggering!