Experiment - GT4 Track Setup Wiki:
#482
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Its well documented that substantial additional rear toe fixes rear stability issues under hard braking. You need rear toe links and about 3 mm per side. The LSD can impact this but when my GT4 was new with a fresh LSD, braking was an issue.
#483
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Hypothetically sure, but you would feel the difference between a worn one and a new one. We've had cars with 10 track miles feel the exact same under hard braking as those with in excess of 20k track miles. Of 50ish GT4's we've serviced since their release, we have yet to have an LSD fail or perform differently from new to warrant replacement.
#484
Three Wheelin'
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camber is -2.0 in rear
toe is 3.1 mm total (1.5/1.6)
Soft/hard sways
^^ these were recommended setting from Tom @ TPC For 50/50 street track alignment
#485
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tchan@tpcracing.com
__________________
PCA National Instructor
TPC Racing stats:
2023 Porsche Sprint Challenge 992 Cup Am Champion
2023 Porsche Sprint Challenge GT4 Pro-Am Team Champion
2022 Porsche Sprint Challenge 992 Cup & 991 Cup Champion
2020 IMSA GT3 Cup Challenge 2nd Championship
2018 IMSA GT3 Cup Challenge 2nd Championship
2016 IMSA GT3 Cup Challenge Champion
2013 IMSA GT3 Cup Challenge Champion
2006 Rolex-24 @ Daytona GT Champion
2004 Grand-Am SGS Class Champion
PCA National Instructor
TPC Racing stats:
2023 Porsche Sprint Challenge 992 Cup Am Champion
2023 Porsche Sprint Challenge GT4 Pro-Am Team Champion
2022 Porsche Sprint Challenge 992 Cup & 991 Cup Champion
2020 IMSA GT3 Cup Challenge 2nd Championship
2018 IMSA GT3 Cup Challenge 2nd Championship
2016 IMSA GT3 Cup Challenge Champion
2013 IMSA GT3 Cup Challenge Champion
2006 Rolex-24 @ Daytona GT Champion
2004 Grand-Am SGS Class Champion
#486
Three Wheelin'
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Can stiffen the rear rebound via DSC. Email me I have a mapping with stiffer rear rebound during braking.
tchan@tpcracing.com
tchan@tpcracing.com
Ok sounds good Tom.
#487
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I think all GT4's wander a bit in the rear when braking at high speed. I have found coming onto the brake a bit softer and then increasing pressure helps quite a bit. I think it just lets the weight transfer to even out a bit. I also run the DSC controller and would look to upgrade the software if it helps.
#489
Three Wheelin'
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Camber plates and Elephan racing pucks in. Really made the different in adjustability
Camber F-3.5 R -2.5
Caster 9
Toe 1/16F. -3/16 R
Swaybar Soft/hard
I was able to fit 265/285 Re71r. Zero rubbing and wheels are nicely centered. See pic.
Before the camber plates and caster pucks, I was only using shims - caster was at 10.9 and camber at -2.8. Outside of tires got eaten up
Tires pics posted below.
Camber F-3.5 R -2.5
Caster 9
Toe 1/16F. -3/16 R
Swaybar Soft/hard
I was able to fit 265/285 Re71r. Zero rubbing and wheels are nicely centered. See pic.
Before the camber plates and caster pucks, I was only using shims - caster was at 10.9 and camber at -2.8. Outside of tires got eaten up
Tires pics posted below.
#490
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myBailey07 OP Michiels car makes a return trip to COTA this last weekends Austin Schnell Fest
now owned and tracked by Brad W. PCA instructor
many of us remembered the car and Michael and told a few stories
glad to see Brad run some laps
now owned and tracked by Brad W. PCA instructor
many of us remembered the car and Michael and told a few stories
glad to see Brad run some laps
#491
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#492
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Any recommendations on a GT4 harness bar and belt set up? I am looking at the "Agency Power Bolt in harness" or equivalent system.
I just traded my 991.1 C4 w/PDK for a GT4 and am very glad to be shifting gears again.
I will check search the other sections too for some instruction on bolting all the belts in securely.
Lots of good data here on setup - very cool!
I just traded my 991.1 C4 w/PDK for a GT4 and am very glad to be shifting gears again.
I will check search the other sections too for some instruction on bolting all the belts in securely.
Lots of good data here on setup - very cool!
#493
Three Wheelin'
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Any recommendations on a GT4 harness bar and belt set up? I am looking at the "Agency Power Bolt in harness" or equivalent system.
I just traded my 991.1 C4 w/PDK for a GT4 and am very glad to be shifting gears again.
I will check search the other sections too for some instruction on bolting all the belts in securely.
Lots of good data here on setup - very cool!
I just traded my 991.1 C4 w/PDK for a GT4 and am very glad to be shifting gears again.
I will check search the other sections too for some instruction on bolting all the belts in securely.
Lots of good data here on setup - very cool!
https://www.bkauto.com/R_1046_Should...t_p/r-1046.htm
They mount behind the seats to the cross member so you don't need to run a separate bar which makes for a cleaner install and doesn't take as much room behind the seats. I installed mine with an additional custom roll hoop
![](https://cimg9.ibsrv.net/gimg/rennlist.com-vbulletin/2000x1504/dsc_5112_2649ff5dac9212e486197aa47ff001e274475bf9.jpg)
![](https://cimg8.ibsrv.net/gimg/rennlist.com-vbulletin/2000x1504/dsc_5106_8c5c085c3cd4c0fa1bf070cce7ede40d4bab1da6.jpg)
Last edited by ajw45; 12-30-2018 at 04:11 AM.
#494
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Very nice looking setup in your GT4 and thanks! I see Brey Krause has all the lap belt and sub-belt connection parts I need, My GT4 has the CF Buckets too so getting the seat to fully roll back for easy vehicle entry and exit was a concern.
*Which under-seat rail sub-belt connection option did you use? It looks like there are some options our manual seat slider used for the CF Buckets.
*Which under-seat rail sub-belt connection option did you use? It looks like there are some options our manual seat slider used for the CF Buckets.
#495
Three Wheelin'
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Very nice looking setup in your GT4 and thanks! I see Brey Krause has all the lap belt and sub-belt connection parts I need, My GT4 has the CF Buckets too so getting the seat to fully roll back for easy vehicle entry and exit was a concern.
*Which under-seat rail sub-belt connection option did you use? It looks like there are some options our manual seat slider used for the CF Buckets.
*Which under-seat rail sub-belt connection option did you use? It looks like there are some options our manual seat slider used for the CF Buckets.
https://cantrellmotorsport.com/produ...ub-belt-mount/