Supersport tyre pressures, what you running on your GT3
Discussion
Given the fact that Cups are manufactured with much stiffer side walls, Supersport will require a higher inflation.
Anybody on here with first hand experience as I will be chucking a set on for the winter exploits this coming week.
Thanks in advance
Last year I was running around 38 psi on the back and 35 psi on the front
L
Anybody on here with first hand experience as I will be chucking a set on for the winter exploits this coming week.
Thanks in advance
Last year I was running around 38 psi on the back and 35 psi on the front
L
I have done two track days on super sports . Ran 34 front and 36 rear.when hot. Seemed fine and similar to the pirellis they replaced. I am not the most experienced on track but the feel was very similar to what I have experiencd. Have a second set of wheels with Trofeo R' s which I am looking forward to testing. Just had the geo done and can't wait to see what - 2.5 on the front camber does. On road the super sports feel fantastic. I love my GT3
LindsayMac said:
Given the fact that Cups are manufactured with much stiffer side walls, Supersport will require a higher inflation.
L
why do you think that ?L
A stiffer side wall has no relevance to pressures imo.
You just run the same and get a nicer ride, the supersport is only a road tyre still, all be it a good one.
If you track it, you might need lower cold pressures as they will heat up more. They still over heat for track use.
mrdemon said:
why do you think that ?
A stiffer side wall has no relevance to pressures imo.
You just run the same and get a nicer ride, the supersport is only a road tyre still, all be it a good one.
If you track it, you might need lower cold pressures as they will heat up more. They still over heat for track use.
Really?A stiffer side wall has no relevance to pressures imo.
You just run the same and get a nicer ride, the supersport is only a road tyre still, all be it a good one.
If you track it, you might need lower cold pressures as they will heat up more. They still over heat for track use.
If your tyre side wall is less stiff then the tyre will tend to "roll" off the contact patch onto the side wall much earlier, therefor using the same pressures is incorrect.
I omitted to mention the pressures I quoted were all "hot" pressures.
Really to be honest the only was to determine the correct pressures is to utilise a contact pyrometer, this should indicate the correct pressures for your driving style with your given geo set up on the car, being a tight scotsman there is little change of that!
On searching an other forum I did come across some excellent work on Supersports
Good starting point http://www.6speedonline.com/forums/997/256730-choo...
LindsayMac said:
Really?
If your tyre side wall is less stiff then the tyre will tend to "roll" off the contact patch onto the side wall much earlier, therefor using the same pressures is incorrect.
I omitted to mention the pressures I quoted were all "hot" pressures.
Really to be honest the only was to determine the correct pressures is to utilise a contact pyrometer, this should indicate the correct pressures for your driving style with your given geo set up on the car, being a tight scotsman there is little change of that!
On searching an other forum I did come across some excellent work on Supersports
Good starting point http://www.6speedonline.com/forums/997/256730-choo...
I have a superb one in aluminium case that has only been used twice - yours for £50 (about a third of what it cost me from memory). If your tyre side wall is less stiff then the tyre will tend to "roll" off the contact patch onto the side wall much earlier, therefor using the same pressures is incorrect.
I omitted to mention the pressures I quoted were all "hot" pressures.
Really to be honest the only was to determine the correct pressures is to utilise a contact pyrometer, this should indicate the correct pressures for your driving style with your given geo set up on the car, being a tight scotsman there is little change of that!
On searching an other forum I did come across some excellent work on Supersports
Good starting point http://www.6speedonline.com/forums/997/256730-choo...
NOW SOLD
Edited by drmark on Monday 30th September 21:21
LindsayMac said:
Really?
If your tyre side wall is less stiff then the tyre will tend to "roll" off the contact patch onto the side wall much earlier, therefor using the same pressures is incorrect.
I omitted to mention the pressures I quoted were all "hot" pressures.
Really to be honest the only was to determine the correct pressures is to utilise a contact pyrometer, this should indicate the correct pressures for your driving style with your given geo set up on the car, being a tight scotsman there is little change of that!
On searching an other forum I did come across some excellent work on Supersports
Good starting point http://www.6speedonline.com/forums/997/256730-choo...
That does not change the fact that increased pressures will just kill the centre line of the tyre.If your tyre side wall is less stiff then the tyre will tend to "roll" off the contact patch onto the side wall much earlier, therefor using the same pressures is incorrect.
I omitted to mention the pressures I quoted were all "hot" pressures.
Really to be honest the only was to determine the correct pressures is to utilise a contact pyrometer, this should indicate the correct pressures for your driving style with your given geo set up on the car, being a tight scotsman there is little change of that!
On searching an other forum I did come across some excellent work on Supersports
Good starting point http://www.6speedonline.com/forums/997/256730-choo...
It's not to off set roll.
Hence the geo has to be matched to your tyre/sus,ARB and why I think it's funny people ask what geo is best.
If you want a harder side wall , you will have to buy another brand, I use race maxx which is 98 load rating and quite stiff.
If you do not want to spend the time with temps and chalking up your tyres it will always only be at 70%
Without extra pressure to support the soft sidewall of the supersport on track/fast corner driving the shoulders roll over and wear excessively. They also chunk from overheating.
So taking tyre temps would back up the need to add pressure since the shoulders would be much hotter than the rest of the tyre surface without higher pressure to assist. These need to be up close to 38/40psi. At this pressure the sidewalls no longer allow the shoulders to roll and the tyre surface temp evens out. You can run extra camber to try and help out the tyre but without more pressure the shoulders still roll.
So in short, you specifically need extra pressure to compensate for the softer sidewall.
On general road driving, the shoulders aren't pushed in the same way and lower pressures are better.
+1
fioran0 said:
Without extra pressure to support the soft sidewall of the supersport on track/fast corner driving the shoulders roll over and wear excessively. They also chunk from overheating.
So taking tyre temps would back up the need to add pressure since the shoulders would be much hotter than the rest of the tyre surface without higher pressure to assist. These need to be up close to 38/40psi. At this pressure the sidewalls no longer allow the shoulders to roll and the tyre surface temp evens out. You can run extra camber to try and help out the tyre but without more pressure the shoulders still roll.
So in short, you specifically need extra pressure to compensate for the softer sidewall.
On general road driving, the shoulders aren't pushed in the same way and lower pressures are better.
So taking tyre temps would back up the need to add pressure since the shoulders would be much hotter than the rest of the tyre surface without higher pressure to assist. These need to be up close to 38/40psi. At this pressure the sidewalls no longer allow the shoulders to roll and the tyre surface temp evens out. You can run extra camber to try and help out the tyre but without more pressure the shoulders still roll.
So in short, you specifically need extra pressure to compensate for the softer sidewall.
On general road driving, the shoulders aren't pushed in the same way and lower pressures are better.
LindsayMac said:
On searching an other forum I did come across some excellent work on Supersports
Good starting point http://www.6speedonline.com/forums/997/256730-choo...
That is what you would call a comprehensive post! Good starting point http://www.6speedonline.com/forums/997/256730-choo...
Very informative though.
Stevorocket said:
32F and 39R like the (2004) GT3 manual says - there are no variations for type of tyre.
If we are talking about SuperSports then we are talking about 997s though. The 997 GT3 has appreciably lower handbook pressures than the 996 or indeed the 997 Carrera as its OE tyres are Cups... Even OPCs don't always know what they are supposed to be doing with them and have on occasion sent people home with PS2s on a GT3 at far too low a pressure than they should be or Cups which were appreciably overinflated (we are talking about 5-7psi here). As an aside - if you were running Cups on your 996 at handbook pressures you would be wasting a lot of available grip : they ought to be a fair bit lower (29/33 f/r used to work well for me when I had a 996 on Cups, which is essentially what the 'book says for the 997. Equally, the 31/38 that I used to run for PS2s is closer (but below - it is lighter though) what Porsche would tell you to set those tyres to on a 997 Carrera).In short (as covered by fiorano later in the thread) not all tyres should necessarily run at the same pressure for optimal performance. Further there are no N rated Supersports in the fitment for GT3s so far, so there is no such thing as a factory recommended pressure for them either. If I were to run Supersports on a 997 I would start at 31 on the front and 37 on the rear from what I've been told about them though
SFO said:
DiscoColin said:
If I were to run Supersports on a 997 I would start at 31 on the front and 37 on the rear from what I've been told about them though
this would mean that the TPM would be beeping too high pressure ...SFO said:
DiscoColin said:
If I were to run Supersports on a 997 I would start at 31 on the front and 37 on the rear from what I've been told about them though
this would mean that the TPM would be beeping too high pressure ...Gassing Station | Porsche General | Top of Page | What's New | My Stuff