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Orthojoe's GT4 track thread and ramblings

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Old 06-05-2016, 04:40 AM
  #496  
Leong72
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Cool video Joe
Your tracks have so many fast turns - that's where the faster guys make up their time. Must be quite difficult to pass safely if you come up behind a slightly slower car.

We had a trackday today. I know you guys probably won't use MPSC2s any more, but I had a new pair on the front and half worn and probably heat cycled pair on the rear. Bars were medium front and hard rear and the car still had slight tendency to understeer. Not bad though, managed a 1.12.8, 0.2 off my best ever time. Track in good condition, ambient temp 59F. Don't think I'll have a problem using up the half worn rears.
Old 06-05-2016, 07:32 AM
  #497  
rraustin
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Originally Posted by orthojoe

4) That being said, I love the RE71R. Lap times rose and peak speeds were dropping from 133 down to 128mph after I switched to OEM cup2, but that was after lunch when the heat really started to come down hard. I don't think anything fair can be said about performance difference. That being said, both handled the heat well, and I felt like both were similar in performance. However, I did noticed that the re71 talked to me more than the cup2. Cup2 talk as well, but the re71r gives you plenty of warning and time that the car is about to break loose. When it does, it is very progressive and controllable. I'm an official believer of the re71r tires. I won't be going back to cup2.
Just spent 4 days on RE71R's in a GTR on the Nurburgring. Outstanding tire in terms of performance and grip. It also seemed to have at least half the tread left after about 450 miles of track time. Seemed pretty good for a very heavy car. It was also very good in the wet. Spent at least an hour driving in rain and pouring rain and the tire was very good and had much more grip then I expected.

Hope to see 20 inch replacement sizes for the GT4 soon.
Old 06-05-2016, 11:26 AM
  #498  
orthojoe
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Originally Posted by Shockwave
Great video Joe!!

What were the lap times on your GT3?
On this particularly hot day, 2:00.0 flat. I can normally do 1:58. Hopefully this means I might be able to squeeze out a sub 2:00 with better weather in the gt4?
Old 06-05-2016, 03:00 PM
  #499  
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Originally Posted by orthojoe
On this particularly hot day, 2:00.0 flat. I can normally do 1:58. Hopefully this means I might be able to squeeze out a sub 2:00 with better weather in the gt4?
Based on one of your data files a theoretical best around 11am was a 2:00:15 so I'm almost positive you can hit that target!

Thanks for the help in T7, btw. Watching the improvement on video shows how obvious it was that your suggested change made the difference.
Old 06-05-2016, 07:46 PM
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Originally Posted by katmeho
Based on one of your data files a theoretical best around 11am was a 2:00:15 so I'm almost positive you can hit that target!

Thanks for the help in T7, btw. Watching the improvement on video shows how obvious it was that your suggested change made the difference.
What was the turn 7 suggestion?
Old 06-05-2016, 09:26 PM
  #501  
orthojoe
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Originally Posted by Mech33
What was the turn 7 suggestion?
Flat out!!! Lol!
Old 06-05-2016, 09:32 PM
  #502  
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Originally Posted by orthojoe
Flat out!!! Lol!
I have the same issue over turn 9. I watched your latest vid you get on the gas way earlier than I do. I still don't feel 100% confident doing that.
Old 06-05-2016, 10:04 PM
  #503  
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Originally Posted by bk_911
I have the same issue over turn 9. I watched your latest vid you get on the gas way earlier than I do. I still don't feel 100% confident doing that.
T9 is early turn in and early throttle. The uphill climb allows you to go faster than you think and prevents you from washing out far to the right. It is one of the more difficult turns because you can't see the exit point. You have to do it by memory. Lots of time to be gained if you nail his corner, but if you go off to the right, it's very rough terrain. A LOT of time can be shaved if you nail 6,7,8,9 together.
Old 06-05-2016, 11:48 PM
  #504  
orthojoe
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Ok, here are some pictures of the re71r
This is after about 120 miles. I only used them for 1/2 the day, but the mileage corresponds to about a normal track day, albeit in very hot temps:

Driver side front tire:
nice and even wear


Passenger side front tire:
There is still some outer edge wear and some beveling of the center rib, but not bad


Driver side rear tire:
even wear


Passenger side rear tire:
just a touch of more outer edge wear compared to the other side


The inner barrels of the OZ wheels all look ok EXCEPT for one. You can see scraping of the finish, but nothing gouging into the metal


There is some scuffing of the caliper, but not much. Most of the scuffing was from test fitting an 18" wheel 2 months ago. There are black scuff marks on the caliper that you can only see when the wheel is taken off that were a result of the OZ wheel. If this bothers you, pick a different wheel. I'm ok with it.


Front cup2 tire after 2.5 track days:
Fairly even wear, but wears too fast given what these tires cost.
Old 06-05-2016, 11:49 PM
  #505  
Mech33
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Originally Posted by orthojoe
Flat out!!! Lol!
Well, duh!
Old 06-05-2016, 11:50 PM
  #506  
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I have no idea why I'm compelled to wash the car since I'm headed to Laguna next weekend...


Old 06-06-2016, 10:55 AM
  #507  
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Last video re-rendered with new software. Dashware has become a disaster. I'm now using race render. Video now synced


Last edited by orthojoe; 06-06-2016 at 11:40 AM.
Old 06-06-2016, 12:06 PM
  #508  
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Originally Posted by orthojoe
Last video re-rendered with new software. Dashware has become a disaster. I'm now using race render. Video now synced

GT4 at Thunderhill in the extreme heat - YouTube
Great video!! I wish TV coverage of racing had similar videos!!
Old 06-06-2016, 02:00 PM
  #509  
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It was fun driving with norcal buddies at Orthojoe's thill day and meeting new people. Wished weather was a bit cooler. boy it was FREAKING hot!

Joe - I agree on race render and dashware has now become a junk software. I have used both mac version and windows version. Windows version works better/faster from my experience.

t9 - i over brake every single time. very tricky turn due to blind crest

damn u are fast on those street tires!!!!

Sorry this is not a gt4 video - i will have videos of some fellow RL's that I chased around.


Last edited by DC640; 06-06-2016 at 08:33 PM.
Old 06-06-2016, 10:00 PM
  #510  
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Originally Posted by DC640
It was fun driving with norcal buddies at Orthojoe's thill day and meeting new people. Wished weather was a bit cooler. boy it was FREAKING hot!

Joe - I agree on race render and dashware has now become a junk software. I have used both mac version and windows version. Windows version works better/faster from my experience.

t9 - i over brake every single time. very tricky turn due to blind crest

damn u are fast on those street tires!!!!

Sorry this is not a gt4 video - i will have videos of some fellow RL's that I chased around.

Thunderhill Orthojoe day - 6/3/16 - 3 mile Course - YouTube
Nice driving, man! I need learn how to exit 15 as well as you do. I never track out far enough. It was fun sharing the track with you again!


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