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For track use, as in on the clock track use/ class based sprints/ road rallying/ point to point, I would take PDK with SC every time. Always delivers the max available power with the least risk - it always delivers faster starts and nearly always delivers faster lap times particularly with technical circuits/stages. Recently witnessed yet another GT4 3rd gear failure and one blown engine - both manuals.
BGB, very interested to see where you go with the S, please do lots of before and after dyno work - starting from stock so that we can make a good assessment of the engine gains relative to the performance gains. The GTS turbos really open the car up from 3.5/4k to redline - importantly you always have boost, as boost is well held off throttle (from braking to ~apex). Nicely sized turbines and compressors mated with good sized actuators/wastegates.
Well, as predicted the weather wasn't too good for the on the clock runs - one dry session . The rest suffered from rain, ranging in intensity from light showers to torrential down pours. This made driving difficult, more so as some corner surfaces had been shaved - the result being loads of grip immediately followed a lot less grip where the old rubber infused surface remained. C'est la vie
Limited data to follow - see below:
Conventional distance velocity plot. Blue circles - braking scaled to pressure, red circles - throttle position scaled to percentage open - (first fast lap).
Distance yaw plot (positive values - track bears left, negative values track bears right (Blue and red circles as above).
and the perennial favourite ........ boost PSI (all data - unfiltered for acceleration and braking).
Point to note: The MPSC2 N1 were very, very sketchy in the wet, in fact they performed very poorly relative to the Advan 050s as used by most other competitors.
Next event - two day road rally, 25 stages and 300kms
Quiet thread - confirms the observation that few 991 series cars including GT cars see much active track duty (other than occasional DE days). Very different to the 997 and 996 generations.
Perhaps a thread entitled "The impact of deviated stitching and contrasted PTS colours on yaw rates" might generate more feedback
Not sure that is true (but very well might be). I think people that track their cars will track their 991 as much as they tracked any car before it. What may have happened is the refinement of the 991 has brought non trackers into 911 sphere. I still thiink there are as many P cars at the track as ever based on my observations.
I am a recent 991.2 buyer. Havent taken it to the track (Im still using a 94 Miata for that) but have driven the .1 cars and the .2 cars at porsche sport drving school multiple times. Have never seen any have a single issue and they get driven hard all day on a fairly regualr basis. Last time I went it was over 100F, never saw oil temps go above 230F on the read out FWIW.
991 is a great car and fun to track, but it’s also designed as a road car first. At my local track there’s always a variety of 991 cars (C2S, GT3, etc). I responded earlier on the thread on basic upgrades I did to run mine sporadically on the track, brake pads and fluid are key and tires help. I strongly prefer running my Cayman Clubsport for track time as it’s a dedicated track car, but another realm with tire costs, etc,
Have a 991.2 GTS.
Okay ran at Autoclub this past weekend, 92F in the afternoon, and at the end of a 30 minute run, the oil temp only got up to 242F ( but I have the third center radiator added).
Not sure if I needed to add it to this car as the base radiators seem to be pretty good.
I got it as I often got to 270F or over on my cayman 981 GTS on some of these same desert tracks in the summer.
Well, a cool car is a happy car.
Have only seen boost pressures up to 19 psi, but I am not monitoring it. Car is great on the track.
Ran pirelli pzero corsa tires ( the PZC4s) and was pleasantly surprised by them.
Quiet thread - confirms the observation that few 991 series cars including GT cars see much active track duty (other than occasional DE days). Very different to the 997 and 996 generations.
At PCA events I run at, boxsters and caymans are the largest group followed by older 911's.
There are a good numbers of GT3's and GT4's, but not a lot of 991 non GT cars yet.
Most wont take a new car to the track. ( unless its the lastest GT3RS).
Running a 2018 GTS here ( but with lots of track tape)
Got my car last week. Night Blue Metallic, 991.2 Base, 7MT non PSE, quad exhaust tips, Sport Chrono, 20" wheels, sport seats and a few other options. Mostly "Enthusiast Spec".
Completed track alignment (as far as the car will go from factory). Fitted MPSC2 (N0 as I had a set of new ones left over from my 991.1 GT3 days).
Next up is Castrol SRF. I have also ordered Souls first set of Cat Bypass pipes (with cat spacers). Hoping these will arrive before my first track day 19 May followed by my second on 20 May.
Struggling with pads. Only choices Ive found to date are RSL-1, RSL29 by Pagid and Endless ME22. Really dont want to run Pagid for their loud road manners but concerned Endless may not go the distance as Ive had both good and bad experience with endless pads on my 993 and GT3. Maybe Ill just run the factory pads till I decide. they may not last very long but they are cheap to replace.
With regards the Sport Chrono data export and manipulation. I went for a 100 mile shake down drive today and made a brief recording. Added the additional channels before I hit the "start". Have now exported as CSV but really stuck in taking this raw data and manipulating it on my PC like you have done. im not a mathematician or a scientist! Any clues would be useful :-)
Hope to report with track data soon (will use my AIM as well - but shame no protocol for the 991.2 ECU yet).
I have a 2018 C2 stick, only has 2000kms on it, so I’m still breaking it in, but it does not feel as fast as the above numbers, the weird part is the turbo boost gauge shows NO boost unless I’m on the hwy at high speed acceleration.
from a stand still to 60 or more no boost showing, and that’s me shifting between 3 and 4000 rpm!
Anyone with a similar issue or is this normal?
I have 850km on mine and it pulls well above 4000. Dont baby it, get it nice and warm then start working those gear and revs - youll find it quite strong 3500-6500. The boost comes in hard in that range...
That’s all fine but you don’t need high revs or full throttle for boost to come in and show on the boost gauge on screen. Even on a slight throttle boost should be showing and slowly increasing. If it doesn’t, take it to the dealer.
04-14-2018, 03:50 AM
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