991 Turbo track car
#466
Three Wheelin'
Thread Starter
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
#467
Addict
Lifetime Rennlist
Member
Lifetime Rennlist
Member
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Interesting that you are internally debating AWD vs 2WD for your next project.
I’m not an experienced road guy, so take this with a grain of salt, but at Barber, after a few back to back sessions in a TTS and GT3 , I personally preferred the TTS. Both are awesome, but I enjoyed the higher off chamber turns at a higher speed in the TTS.
I’m not an experienced road guy, so take this with a grain of salt, but at Barber, after a few back to back sessions in a TTS and GT3 , I personally preferred the TTS. Both are awesome, but I enjoyed the higher off chamber turns at a higher speed in the TTS.
But a track purpose car such as the GT2RS has so much potential to be modified further, and make another 4-5 secs per 2 minute lap.
On the other hand the 992TT /
should quickly beat a 991GT2RS once good tuning and suspension work is done on it without going all out race setup, and being daily driven.
#468
Three Wheelin'
Thread Starter
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
I have to agree with this. The 992TT (991.3) already starts off with more torque than the GT2RS, which tells you the potential from there will be stellar. I can easily see adding a used 992TTS in a few years to take the pressure off the GT2RS for track work.
#469
Addict
Lifetime Rennlist
Member
Lifetime Rennlist
Member
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Autobild test 992 Turbo
Impressive acceleration from the 992 Turbo S:
0-100 kph 2.5s fastest car ever tested by Autobild.
0-200 kph 8.5s same as 991GT2RS.
0-300kph in 26s is 3 secs slower than GT2RS, but 3 seconds faster than the 991.2 turbo S.
But what they don't tell you is that Porsche seems to have made smart usage of gearing in 0-200kph for bragging rights, 2nd gear takes you almost exactly to 100kph (~120kph on the 991) and 4th gear to 200kph (~230kph on the 991), which will improve times from 0-200kph. Then at higher speeds it suffers because of a taller 5th gear and loses ground vs the GT2RS.
The 7200RPM limiter is surprisingly 300RPM less than the Carrera's same engine, with tuning and a 7500RPM limiter it will change things a lot. Also seems to suffer from some lag, mix of low compression of 8.7 with larger turbos that variable cams don't seem to offset enough.
The new PDK E-ready is heavier by around 50lbs but is rated at 1000NM so the tuning potential of this car is huge, the GT2RS torque was limited to safeguard the PDK.
In the video 2 seconds faster than a 991.2 turbo on the track is quite impressive also.
Impressive acceleration from the 992 Turbo S:
0-100 kph 2.5s fastest car ever tested by Autobild.
0-200 kph 8.5s same as 991GT2RS.
0-300kph in 26s is 3 secs slower than GT2RS, but 3 seconds faster than the 991.2 turbo S.
But what they don't tell you is that Porsche seems to have made smart usage of gearing in 0-200kph for bragging rights, 2nd gear takes you almost exactly to 100kph (~120kph on the 991) and 4th gear to 200kph (~230kph on the 991), which will improve times from 0-200kph. Then at higher speeds it suffers because of a taller 5th gear and loses ground vs the GT2RS.
The 7200RPM limiter is surprisingly 300RPM less than the Carrera's same engine, with tuning and a 7500RPM limiter it will change things a lot. Also seems to suffer from some lag, mix of low compression of 8.7 with larger turbos that variable cams don't seem to offset enough.
The new PDK E-ready is heavier by around 50lbs but is rated at 1000NM so the tuning potential of this car is huge, the GT2RS torque was limited to safeguard the PDK.
In the video 2 seconds faster than a 991.2 turbo on the track is quite impressive also.
The following users liked this post:
pepinozaur (06-14-2020)
#470
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Autobild test 992 Turbo
https://youtu.be/Ze9UWns4g-o
Impressive acceleration from the 992 Turbo S:
0-100 kph 2.5s fastest car ever tested by Autobild.
0-200 kph 8.5s same as 991GT2RS.
0-300kph in 26s is 3 secs slower than GT2RS, but 3 seconds faster than the 991.2 turbo S.
But what they don't tell you is that Porsche seems to have made smart usage of gearing in 0-200kph for bragging rights, 2nd gear takes you almost exactly to 100kph (~120kph on the 991) and 4th gear to 200kph (~230kph on the 991), which will improve times from 0-200kph. Then at higher speeds it suffers because of a taller 5th gear and loses ground vs the GT2RS.
The 7200RPM limiter is surprisingly 300RPM less than the Carrera's same engine, with tuning and a 7500RPM limiter it will change things a lot. Also seems to suffer from some lag, mix of low compression of 8.7 with larger turbos that variable cams don't seem to offset enough.
The new PDK E-ready is heavier by around 50lbs but is rated at 1000NM so the tuning potential of this car is huge, the GT2RS torque was limited to safeguard the PDK.
In the video 2 seconds faster than a 991.2 turbo on the track is quite impressive also.
https://youtu.be/Ze9UWns4g-o
Impressive acceleration from the 992 Turbo S:
0-100 kph 2.5s fastest car ever tested by Autobild.
0-200 kph 8.5s same as 991GT2RS.
0-300kph in 26s is 3 secs slower than GT2RS, but 3 seconds faster than the 991.2 turbo S.
But what they don't tell you is that Porsche seems to have made smart usage of gearing in 0-200kph for bragging rights, 2nd gear takes you almost exactly to 100kph (~120kph on the 991) and 4th gear to 200kph (~230kph on the 991), which will improve times from 0-200kph. Then at higher speeds it suffers because of a taller 5th gear and loses ground vs the GT2RS.
The 7200RPM limiter is surprisingly 300RPM less than the Carrera's same engine, with tuning and a 7500RPM limiter it will change things a lot. Also seems to suffer from some lag, mix of low compression of 8.7 with larger turbos that variable cams don't seem to offset enough.
The new PDK E-ready is heavier by around 50lbs but is rated at 1000NM so the tuning potential of this car is huge, the GT2RS torque was limited to safeguard the PDK.
In the video 2 seconds faster than a 991.2 turbo on the track is quite impressive also.
#471
Racer
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
I found that video of the ZR1 doing a 1:55.9 at VIR. Yeah, his video description says it's October 2018 and he's on scrub slicks, but I've been on track with him before and he's been very fast. To further my point, sadly only a month later he crashed that ZR1 at Summit Point and now drives a C7 Grand Sport very quickly instead.
BTW what software was he running. Pretty impressive graphs
#472
Three Wheelin'
Thread Starter
#473
Racer
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Once finished your car with all the great modifications, you will be recording street car lap records across the board, the GT2RS Clubsport lap times will be definitely within your reach. You should go to a few tracks around the US to compare your data.
My 991TT is done for the circuit, not pushing it any further, now eyeing the 992TT and go full mods, or a GT2RS to be modified. I expect the 992TT to be 2 seconds faster than the 991.1TT on a 1 minute Hockenheim type of circuit.
My 991TT is done for the circuit, not pushing it any further, now eyeing the 992TT and go full mods, or a GT2RS to be modified. I expect the 992TT to be 2 seconds faster than the 991.1TT on a 1 minute Hockenheim type of circuit.
With that said, one of the things i really enjoy about my car is how easy its to drive at the limit. Have not driven a 2RS, but have driven both a 991.2 GT3 RS and 991.2 GT3 Cup, and in both instances found it easier to make a mistake. This is mostly due to the 4WD vs 2WD but also found a good difference under breaking but i'm attributing this to setup rather than the car itself.
Then the question is, do you want to modify a $350k car this much? it would be fun though.
#474
Rennlist Member
Join Date: Jan 2013
Location: West Vancouver and San Francisco
Posts: 4,260
Received 1,225 Likes
on
603 Posts
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
But what they don't tell you is that Porsche seems to have made smart usage of gearing in 0-200kph for bragging rights, 2nd gear takes you almost exactly to 100kph (~120kph on the 991) and 4th gear to 200kph (~230kph on the 991), which will improve times from 0-200kph. Then at higher speeds it suffers because of a taller 5th gear and loses ground vs the GT2RS.
Also seems to suffer from some lag, mix of low compression of 8.7 with larger turbos that variable cams don't seem to offset enough.
I'm surprised to hear about the lag - 991.2 Turbo minimized it already with clever trickery and I hoped they would continue making progress there. Lower compression usually helps reduce lag because there is more energy left in the exhaust gasses due to shorter expansion cycle (hence higher compression engines being more efficient because they are able to capture more energy from the fuel into engine work).
#476
Racer
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Update: My friend took the advice, bled them down to low 30's hot and his grip issues disappeared! Thanks again.
Yeah, I come in to the pits if I hit 35psi front or back. I go out cold at 26psi and creep around a lap or two (still faster than most people) until I get up to 30/30 and then let her rip. I don't have any issues with grip unless I am driving like a crazy green student. It's certainly tire pressure and driving technique - patience. When the car is straight, it bites like crazy. When exiting a turn, he needs to add throttle gradually until straight. Also possible he's entering turns to fast - slow in, fast out. If he needs more downforce, he needs to remove the grills under the fender vents, and change to the highest setting on the rear wing. Finally, maybe he needs to get the camber increased (more negative...you know what I mean). I just turned a whole mess of 1:56/1:57's at VIR this past week on sketchy Cup2R tires...I've never seen any street car do that, even on slicks. It's not a problem with the car, but maybe tire pressure, camber, and technique. He should really seek some coaching if these issues don't fix this experience. This is not meant to be critical, only constructive.
#477
#478
Addict
Lifetime Rennlist
Member
Lifetime Rennlist
Member
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
You're right and it looks like it was perceived lag by the test driver, he must have confused lag with gear ratios, to find out turbo behavior and lag, one needs to look at in-gear acceleration in higher gears:
80-120kph (~50-75mph) in 5th gear:
991 Turbo S: 3.7 sec
992 Turbo S : 3.6 sec (no additional lag here clearly)
Whats funny are the numbers below:
80-120kph in 6th gear:
991.2 Turbo S: 4.9s
992 Turbo S: 5.8 s (huge difference, because of gear ratios)
80-120kph (~50-75mph) in 5th gear:
991 Turbo S: 3.7 sec
992 Turbo S : 3.6 sec (no additional lag here clearly)
Whats funny are the numbers below:
80-120kph in 6th gear:
991.2 Turbo S: 4.9s
992 Turbo S: 5.8 s (huge difference, because of gear ratios)
#479
Three Wheelin'
Thread Starter
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
You're right and it looks like it was perceived lag by the test driver, he must have confused lag with gear ratios, to find out turbo behavior and lag, one needs to look at in-gear acceleration in higher gears:
80-120kph (~50-75mph) in 5th gear:
991 Turbo S: 3.7 sec
992 Turbo S : 3.6 sec (no additional lag hear clearly)
Whats funny are the numbers below:
80-120kph in 6th gear:
991.2 Turbo S: 4.9s
992 Turbo S: 5.8 s (huge difference, because of gear ratios)
80-120kph (~50-75mph) in 5th gear:
991 Turbo S: 3.7 sec
992 Turbo S : 3.6 sec (no additional lag hear clearly)
Whats funny are the numbers below:
80-120kph in 6th gear:
991.2 Turbo S: 4.9s
992 Turbo S: 5.8 s (huge difference, because of gear ratios)
The following users liked this post:
pfbz (06-18-2020)
#480
Racer