Orthojoe's GT4 track thread and ramblings
07-30-2016, 11:53 PM
#766
Not out yet. Coming soon: https://rennlist.com/forums/gt4/9464...-status-2.html
Email from TR today said they expect to have fronts by third week of Aug. and rears by early Sept.
07-31-2016, 07:11 AM
#767
08-07-2016, 10:51 PM
#768
Joe you're and animal. Just watched the 1:39.2 at Laguna. Wow.
08-07-2016, 11:53 PM
#769
Nordschleife Master
Thread Starter
Ha. Thanks. Only 0.2 seconds faster, but still knocking on the 1:38 door. According to the data, I lost 0.3 seconds and 5mph from hesitating through T1 because it seemed like the 911 race car was slowing down. It was tough to get open space to run a clean lap on this day because of all the traffic. Start watching the 3rd lap and you'll see what I'm talking about.
During the last session, I got to chase a former USTCC driver in his friend's GT4. I got to see where I was really deficient and how someone really drives the track well. He did 1:39 as well, but he had a passenger, and track conditions were slower at the end of the day. I was only doing 1:41 at this point. I'm pretty confident he can do 1:37 with no passenger and a morning cool session. Watch him use the entire track and not wimp out like I do when exiting a turn. I really need to work on this. Watch at 8:18 he drops 2 wheels off at the exit of 5, but keeps going without ever lifting and ever losing control.
A few things:
1) I moved my front bar from middle to soft. I couldn't really notice a difference. The car still understeers
2) I had DSC running this time, whereas last time I didn't. I am a few tenths faster, but I'm also used to the way the car drives now. On 9/9 I will have someone randomly remove the unit on me and see what happens.
3) I ran the RE71 after flipping them inside to outside. The tires still perform the same and I'm evening out the wear. By doing this I think I can get 5 days out of the tires instead of 3, which would be great.
During the last session, I got to chase a former USTCC driver in his friend's GT4. I got to see where I was really deficient and how someone really drives the track well. He did 1:39 as well, but he had a passenger, and track conditions were slower at the end of the day. I was only doing 1:41 at this point. I'm pretty confident he can do 1:37 with no passenger and a morning cool session. Watch him use the entire track and not wimp out like I do when exiting a turn. I really need to work on this. Watch at 8:18 he drops 2 wheels off at the exit of 5, but keeps going without ever lifting and ever losing control.
A few things:
1) I moved my front bar from middle to soft. I couldn't really notice a difference. The car still understeers
2) I had DSC running this time, whereas last time I didn't. I am a few tenths faster, but I'm also used to the way the car drives now. On 9/9 I will have someone randomly remove the unit on me and see what happens.
3) I ran the RE71 after flipping them inside to outside. The tires still perform the same and I'm evening out the wear. By doing this I think I can get 5 days out of the tires instead of 3, which would be great.
08-14-2016, 05:19 PM
#770
Rennlist Member
Not sure if it was mentioned earlier is this thread, however, I remember hearing that you like a lot of rear toe-in. Just in case no one else noticed it, apparently this is consistent with the Porsche factory recommended specs for the clubsport racecar.
https://rennlist.com/forums/gt4/9188...l#post13023948
The road car Porsche factory recommended specs:
10 arcminutes toe-in each side = 2 mm each side using whole tire diameter = 1.5 mm each side using 20 inch toe sticks on hub
The clubsport racecar Porsche factory recommended specs:
17 arcminutes toe-in each side = 3.4 mm each side using whole tire diameter = 2.5 mm each side using 20 inch toe sticks on hub
https://rennlist.com/forums/gt4/9188...l#post13023948
The road car Porsche factory recommended specs:
10 arcminutes toe-in each side = 2 mm each side using whole tire diameter = 1.5 mm each side using 20 inch toe sticks on hub
The clubsport racecar Porsche factory recommended specs:
17 arcminutes toe-in each side = 3.4 mm each side using whole tire diameter = 2.5 mm each side using 20 inch toe sticks on hub
08-14-2016, 09:28 PM
#771
Nordschleife Master
Thread Starter
Originally Posted by Yargk
Not sure if it was mentioned earlier is this thread, however, I remember hearing that you like a lot of rear toe-in. Just in case no one else noticed it, apparently this is consistent with the Porsche factory recommended specs for the clubsport racecar.
https://rennlist.com/forums/gt4/9188...l#post13023948
The road car Porsche factory recommended specs:
10 arcminutes toe-in each side = 2 mm each side using whole tire diameter = 1.5 mm each side using 20 inch toe sticks on hub
The clubsport racecar Porsche factory recommended specs:
17 arcminutes toe-in each side = 3.4 mm each side using whole tire diameter = 2.5 mm each side using 20 inch toe sticks on hub
https://rennlist.com/forums/gt4/9188...l#post13023948
The road car Porsche factory recommended specs:
10 arcminutes toe-in each side = 2 mm each side using whole tire diameter = 1.5 mm each side using 20 inch toe sticks on hub
The clubsport racecar Porsche factory recommended specs:
17 arcminutes toe-in each side = 3.4 mm each side using whole tire diameter = 2.5 mm each side using 20 inch toe sticks on hub
Last edited by orthojoe; 08-14-2016 at 10:34 PM.
08-15-2016, 10:45 AM
#773
Three Wheelin'
Rear Toe in fixes breaking instability. What are the downsides of toe in
The braking instability seems very uncomfortable mentally and makes downshift harder but all in all car seems fine. Its just me that suffers.
So I am wondering what the downsides are in other parts of the track?
The braking instability seems very uncomfortable mentally and makes downshift harder but all in all car seems fine. Its just me that suffers.
So I am wondering what the downsides are in other parts of the track?
08-15-2016, 10:51 AM
#774
Nordschleife Master
Thread Starter
Originally Posted by MarcD147
Rear Toe in fixes breaking instability. What are the downsides of toe in
The braking instability seems very uncomfortable mentally and makes downshift harder but all in all car seems fine. Its just me that suffers.
So I am wondering what the downsides are in other parts of the track?
The braking instability seems very uncomfortable mentally and makes downshift harder but all in all car seems fine. Its just me that suffers.
So I am wondering what the downsides are in other parts of the track?
1) more drag when accelerating down a straight. Negligible
2) more outer edge wear. On the cup2 I never saw any, but I do get some with the re71r. Nowhere near as bad as the outer edge wear in the front.
08-27-2016, 11:51 AM
#775
Rennlist Member
I ran at Sonoma yesterday after having the TPC offset toelinks and DSC module installed. I also had Tarett monoballs installed and the car aligned to TPC ¾ track specs with 1.5mm toe in at each of the rear wheels. (thanks to Tom Chan at TPC for the specs). While I am not near as fast as Joe I did get a new PB of 1:57, a second and a half better from my old time. I can say with certainty that this set up cured a lot of the car's twitchyness under hard braking and the car was more stable in the transitions (1-2, 3-3a and the esses). Money well spent AFAIC.
Last edited by RDCR; 08-27-2016 at 12:18 PM.
08-27-2016, 11:58 AM
#776
Nordschleife Master
Thread Starter
Originally Posted by RDCR
I ran at Sonoma yesterday after having the TPC offset toelinks and DSC module installed. I also had Tarett monoballs installed and the car aligned to TPC ¾ track specs with 1.5mm toe at each of the rear wheels. (thanks to Tom Chan at TPC for the specs). While I am not near as fast as Joe I did get a new PB of 1:57, a second and a half better from my old time. I can say with certainty that this set up cured a lot of the car's twitchyness under hard braking and the car was more stable in the transitions (1-2, 3-3a and the esses). Money well spent AFAIC.
I'm headed to Sonoma tomorrow myself!
08-27-2016, 01:54 PM
#778
Instructor
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Any idea what lap times are the gt4 clubsports running at Laguna?
Ha. Thanks. Only 0.2 seconds faster, but still knocking on the 1:38 door. According to the data, I lost 0.3 seconds and 5mph from hesitating through T1 because it seemed like the 911 race car was slowing down. It was tough to get open space to run a clean lap on this day because of all the traffic. Start watching the 3rd lap and you'll see what I'm talking about.
1:39.2 at Laguna Seca with the GT4 TMR/POC 8/6/16 - YouTube
During the last session, I got to chase a former USTCC driver in his friend's GT4. I got to see where I was really deficient and how someone really drives the track well. He did 1:39 as well, but he had a passenger, and track conditions were slower at the end of the day. I was only doing 1:41 at this point. I'm pretty confident he can do 1:37 with no passenger and a morning cool session. Watch him use the entire track and not wimp out like I do when exiting a turn. I really need to work on this. Watch at 8:18 he drops 2 wheels off at the exit of 5, but keeps going without ever lifting and ever losing control.
SeanGT4 - YouTube
A few things:
1) I moved my front bar from middle to soft. I couldn't really notice a difference. The car still understeers
2) I had DSC running this time, whereas last time I didn't. I am a few tenths faster, but I'm also used to the way the car drives now. On 9/9 I will have someone randomly remove the unit on me and see what happens.
3) I ran the RE71 after flipping them inside to outside. The tires still perform the same and I'm evening out the wear. By doing this I think I can get 5 days out of the tires instead of 3, which would be great.
1:39.2 at Laguna Seca with the GT4 TMR/POC 8/6/16 - YouTube
During the last session, I got to chase a former USTCC driver in his friend's GT4. I got to see where I was really deficient and how someone really drives the track well. He did 1:39 as well, but he had a passenger, and track conditions were slower at the end of the day. I was only doing 1:41 at this point. I'm pretty confident he can do 1:37 with no passenger and a morning cool session. Watch him use the entire track and not wimp out like I do when exiting a turn. I really need to work on this. Watch at 8:18 he drops 2 wheels off at the exit of 5, but keeps going without ever lifting and ever losing control.
SeanGT4 - YouTube
A few things:
1) I moved my front bar from middle to soft. I couldn't really notice a difference. The car still understeers
2) I had DSC running this time, whereas last time I didn't. I am a few tenths faster, but I'm also used to the way the car drives now. On 9/9 I will have someone randomly remove the unit on me and see what happens.
3) I ran the RE71 after flipping them inside to outside. The tires still perform the same and I'm evening out the wear. By doing this I think I can get 5 days out of the tires instead of 3, which would be great.
08-27-2016, 03:48 PM
#779
Nordschleife Master
Thread Starter
Originally Posted by RDCR
Post video! One thing I felt helped me as well yesterday was short shifting into 4th after 7A which I picked up from watching your last Sonoma video.
Originally Posted by cooperyau
Any idea what lap times are the gt4 clubsports running at Laguna?
08-27-2016, 03:50 PM
#780
