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Track day tyre pressure?
https://forums.tipec.net/viewtopic.php?f=8&t=4593		 Page 1 of 1
Author:  Pepi1677 [ Sun May 31, 2009 8:10 pm ]
Post subject:  Track day tyre pressure?
I have a 996 C2 and I run the tyre pressure as set out in the manual. I was wondering how every one manages the tyre pressures on a track day?
Author:  DavidWH [ Sun May 31, 2009 10:32 pm ]
Post subject:  Re: Track day tyre pressure?
hot temps (i.e. as you come off track) should be set as per cold temps on the sticker attached to the car in the first instance.

That's assuming you are running road tyres ?

David
Author:  Brett928S2 [ Sun May 31, 2009 10:48 pm ]
Post subject:  Re: Track day tyre pressure?
Pepi1677 wrote:
I have a 996 C2 and I run the tyre pressure as set out in the manual. I was wondering how every one manages the tyre pressures on a track day?



Hi :)

The way to do it is this.....

Say your road tyre pressures are set at ...say 36psi as an example......

Go for a COUPLE or maybe 3 hot laps and when you get back to the pits check your pressures.......you will find they have gone UP by around 4 psi....which you then let out to go back to 36...

Then another couple of hot laps and measure again...you will probably find they have gone up by around 2 to 3 psi....which you let out again....

Eventually after several times you will find that the pressures stabilise at 36 psi.....which is how you leave them for the rest of the day....

2 IMPORTANT POINTS....

1, After the days racing DO NOT forget to use a compressor (or nearest garage compressor) AFTER the tyres have cooled to put the pressures BACK UP.....

2. Use an ACCURATE gauge....and I dont mean a 70p Halfords special....mine is a Snap-On one that cost around £30....which I use all the time even in garages as its MUCH more accurate than garage ones that have been kicked around...

Hope this helps :)

All the best Brett :)
Author:  Pepi1677 [ Mon Jun 01, 2009 3:52 am ]
Post subject:  Re: Track day tyre pressure?
Thanks for that, I normally run F36 R40 as per sticker on car.
Author:  DavidWH [ Mon Jun 01, 2009 9:46 am ]
Post subject:  Re: Track day tyre pressure?
ok;
then as Brett says, start of with these pressures; then each time you come in off track immediately check your pressure and reduce down to the original sticker pressures, bit by bit. Kepp checking throughout the day, but most of the change wil take place in the first couple of sessions. Dont forget to re-check after lunch if they have had time to cool right down & be careful on your out laps
Doing this will also give you a good idea of how you are using the car, i.e. using the front or rear tyres more.

and dont forget to add air when you're ready to go home.i'd also stop after 20 mins or so at a garage and re-check ideally.
better safe than sorry !
Author:  Pepi1677 [ Mon Jun 01, 2009 3:47 pm ]
Post subject:  Re: Track day tyre pressure?
Thanks I think I will look out fot a good tyre pressure gauge, I have a mini compressor.
Author:  Paul Mabley [ Mon Jun 01, 2009 3:50 pm ]
Post subject:  Re: Track day tyre pressure?
That's exactly what I do.

I think the standard is 36F, 44R and you will find that starting 4psi lower from cold does the job as Brett said.

However, I have found that generally those quoted pressures are a little high but this is personal preference for experimentation.
Author:  Pepi1677 [ Tue Jun 23, 2009 5:59 pm ]
Post subject:  Re: Track day tyre pressure?
Thanks for all the info. I did one session and the pressures rose by 4psi all round so lowered them to F36 R44. I then did a second session and they rose by 4psi all round again lowered them back down to 36-44. They then stayed at these pressures for the rest of the day.

Had a cuppa before I left and checked pressurses and they dropped 4psi, inflated to road pressure, checked the next day and had dropped by 4psi.
Author:  Sean Smallman [ Tue Jun 23, 2009 7:19 pm ]
Post subject:  Re: Track day tyre pressure?
Good to meet you last night, even better hearing you leave :twisted:
Author:  Pepi1677 [ Tue Jun 23, 2009 7:22 pm ]
Post subject:  Re: Track day tyre pressure?
Great to meet you at last, glad you enjoyed it!
Author:  Sean Smallman [ Tue Jun 23, 2009 8:09 pm ]
Post subject:  Re: Track day tyre pressure?
Seeing as you had started the bon voyage salute, it would have been rude not to follow suit.

We might be barred next month :D
Author:  blue turbo [ Mon Oct 19, 2009 4:58 pm ]
Post subject:  Re: Track day tyre pressure?
the garage i bought mine from, set them at 28F and 32B, so not much letting out on my first track day :mrgreen: they said that these where what they favour, as it gets the best out of the car while being driven.
Author:  DavidWH [ Tue Oct 20, 2009 2:32 pm ]
Post subject:  Re: Track day tyre pressure?
hmm I'd be careful at those pressures

Porsche do tend to know a thing or two about their cars.
I'd go with book pressures initially for road driving, then tweak in small increments to personal taste
Author:  Paul Mabley [ Tue Oct 20, 2009 3:05 pm ]
Post subject:  Re: Track day tyre pressure?
For normal road driving (I don't do trackdays) I am about 4psi below the manufacturer but as David says I changed in increments to suit my taste. This gives 32F and 40R in my case.

The 32R figure seems incredibly low for road use (12psi below recommended) given all the weight is above the rear wheels and I'd worry the rim could touch the ground under higher speed cornering if the tyre wasn't hot enough.

Willing to be proved wrong though!
Author:  blue turbo [ Tue Oct 20, 2009 3:21 pm ]
Post subject:  Re: Track day tyre pressure?
next time i get it out, going to put what it says and take it from there.
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