2018 991.2 GT3's - can we run Slicks on the Track?
01-26-2018, 05:31 PM
#1
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2018 991.2 GT3's - can we run Slicks on the Track?
Just got my new 2018 991.2 GT3 picking up next week. I use to have a 2015 991.1 GT3 which Porsche said I could not run slicks on the track it would void the warranty. Does anyone know if that still holds for the 991.2 GT3's?
Thanks,
Jerry
Thanks,
Jerry
01-26-2018, 05:44 PM
#2
Manual still says no slicks on the .2s
01-27-2018, 04:07 PM
#7
When you say we can run... does it mean we can fit R7s or that the warranty is ok with it...
My understanding is that Porsche will not warranty any issues that appear during track time, or related to track. Although many dealers will still honor the warranty as good faith to their loyal customers.
My understanding is that Porsche will not warranty any issues that appear during track time, or related to track. Although many dealers will still honor the warranty as good faith to their loyal customers.
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01-27-2018, 04:28 PM
#8
When you say we can run... does it mean we can fit R7s or that the warranty is ok with it...
My understanding is that Porsche will not warranty any issues that appear during track time, or related to track. Although many dealers will still honor the warranty as good faith to their loyal customers.
My understanding is that Porsche will not warranty any issues that appear during track time, or related to track. Although many dealers will still honor the warranty as good faith to their loyal customers.
As for track use, unlike previous models, the 991 GT3 is explicitly covered for track use and a booklet explaining the additional service intervals that must be followed is included with the rest of the documentation that comes with the car. No doubt there are circumstances where Porsche might refuse to cover a car used in competition, but for normal DE's or autocross, for example, there should be no problem.
01-27-2018, 04:43 PM
#9
Depending on your dealer and as long as you use DOT certified, street legal tires and keep up the additional maintenance you are OK with a .1. I don't believe that Hohos fall into the DOT certified, street legal tires category.
From The Tirerack:
WARNING: DOT labeled Hoosier Racing Tires meet Department of Transportation requirements for marking and performance only and are NOT INTENDED FOR HIGHWAY USE. It is unsafe to operate any Hoosier Racing Tire, including DOT tires, on public roads. The prohibited use of Hoosier Racing Tires on public roadways may result in loss of traction, unexpected loss of vehicle control, or sudden loss of tire pressure, resulting in a vehicle crash and possible injury or death.
It may therefore be best to have a 2nd set of wheels and use the OEM wheels with the OEM tires.
All depends on your dealer. RL posts need to be taken with a grain of salt since dealers vary.
From The Tirerack:
WARNING: DOT labeled Hoosier Racing Tires meet Department of Transportation requirements for marking and performance only and are NOT INTENDED FOR HIGHWAY USE. It is unsafe to operate any Hoosier Racing Tire, including DOT tires, on public roads. The prohibited use of Hoosier Racing Tires on public roadways may result in loss of traction, unexpected loss of vehicle control, or sudden loss of tire pressure, resulting in a vehicle crash and possible injury or death.
It may therefore be best to have a 2nd set of wheels and use the OEM wheels with the OEM tires.
All depends on your dealer. RL posts need to be taken with a grain of salt since dealers vary.
01-27-2018, 10:00 PM
#10
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19" slicks work well on the 991.1 GT3, looking to do the same on a .2 model soon.....
Regarding the warrantee, it all depends on your local dealer......
Regarding the warrantee, it all depends on your local dealer......
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James F. Sofronas | President & Owner
Global Motorsports Group ™
E: james@gmgracing.com
P: +1 (714) 432-1582
F: +1 (714) 432-1590
A: 3210 South Shannon Street, Santa Ana, California 92704
W: gmgracing.com
01-27-2018, 10:14 PM
#11
Hoosiers are DOT certified fully and street legal to the letter of the law. Due to the depth of the groves they will fall below street legal limits in terms of tread depth from virtually the moment they turn a wheel, but I don’t think Porsche can void a warranty because the tires don’t have enough tread. Thus my read is that they qualify; if anyone has heard of the warranty not being honored due to running them I’d like to hear about it...
01-28-2018, 11:24 AM
#12
Race Director
Wouldn’t running slicks put a lot more strain on the suspension, brakes, etc? I am just asking, but it seems like if you increase the mechanical grip like that something else is going to pay the price.
01-28-2018, 11:35 AM
#13
It should be noted that fatigue life is highly non-linear; slightly more load can mean a lot less life, so it’s incorrect to assume that a 20% increase in grip results in a proportional decrease in life. In reality it’s likely more like half the life assuming the same factor of safety.
01-28-2018, 11:42 AM
#14
Race Director
Higher G loads will effect engine oiling, etc, and yes suspension loads go up with grip. More stress on these components means the time change interval on rear hubs (6000 track miles with the stock rubber), etc are no longer valid and need to come down; how much depends on how sticky the rubber is and where on the fatigue curve the parts lie. That’s likely why Porsche will not honor the warranty with slicks mounted- stuff’s going to break sooner.
It should be noted that fatigue life is highly non-linear; slightly more load can mean a lot less life, so it’s incorrect to assume that a 20% increase in grip results in a proportional decrease in life. In reality it’s likely more like half the life assuming the same factor of safety.