Tracking tyre pressure

Brci · 07-01-2014, 02:35 AM

Hi,

Could you please guys help how much to deflate the tyres for track use of F10 M5? I'm having the 343 M wheels in 20" size.

Thank you.

RPiM5 · 07-01-2014, 06:14 AM

If your going to be tracking the M5 on a hot day, I'd go to about 32psi on all 4 tires. If it's really hot out, you'll see temps over 120 degrees in the tires.

Northern X5M · 07-01-2014, 09:10 AM

After a hard 20 minute lap session, the pressure in my tires went up 8-10 psi.

Brci · 07-01-2014, 09:13 AM

thank you so much for the answers

gmd2003 · 07-01-2014, 06:14 PM

Quote:

Originally Posted by Brci

Hi,

Could you please guys help how much to deflate the tyres for track use of F10 M5? I'm having the 343 M wheels in 20" size.

Thank you.

After the first session come in immediately and check your tire pressure . This will be your hot pressure which should be within 1 psi of where you were on track . The PSS likes to be at 34-36 psi hot temp . Depending on you're experience level , ambient temp , track surface temp , humidity in you're tires ( most important factor ) the tire temps on a 600 hp 4xxx pound car on track can increase 8-10 psi !! So throughout the day you will be releasing air from your tires to maintain optimal pressure . If you don't then you will run over pressure and loose a significant amount of traction , bc of reduction in tire contact patch .

thebishman · 07-02-2014, 08:58 AM

Some ultra high performance street tyres have small 'triangles' slightly raised on the top of the sidewall tread showing where the maximal contact patch should be. If you aren't noticing that the tread wear is coming over to those triangles you are over inflated; if the tread wear is past the triangles, then you are under inflated. Just another data point to use. What is the gold standard of course is tyre temperature which you should have someone measure for you in the hot pits. You will be attempting to have the same hot temperatures across the whole of the contact patch. Furthermore, remember that you most probably will have to have different psi in the tyres, front, rear, side to side, depending on the layout of the track and whether it is clockwise versus anti clockwise.

Taking the time to get tyre pressures right is vital not just for safety or increased speeds and better handling, but also in tyre longevity. Having a $400 tyre 'chunk', (throw off tread blocks), and be ruined makes for a very expensive weekend! lol

Good luck and have fun.

07-01-2014, 02:35 AM	#1
Brci New Member 6 Rep 8 Posts Drives: M5 - individual Join Date: Mar 2014 Location: Europe iTrader: (0)	Tracking tyre pressure Hi, Could you please guys help how much to deflate the tyres for track use of F10 M5? I'm having the 343 M wheels in 20" size. Thank you.
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07-01-2014, 06:14 AM	#2
RPiM5 Major General 2872 Rep 7,885 Posts Drives: Black M5 Join Date: Apr 2012 Location: Earth 616 iTrader: (0)	If your going to be tracking the M5 on a hot day, I'd go to about 32psi on all 4 tires. If it's really hot out, you'll see temps over 120 degrees in the tires. __________________
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07-01-2014, 09:10 AM	#3
Northern X5M Captain 105 Rep 806 Posts Drives: 2014 Tanzanite Blue M5 Join Date: Oct 2010 Location: Edmonton, Alberta, Canada iTrader: (0)	After a hard 20 minute lap session, the pressure in my tires went up 8-10 psi. __________________ 2014 ///M5 CP Tanzanite Blue/Cohiba - 11.15 @ 128.8 & 1.84 60' (2150' DA) - BPM Tune - MSR Intake - SSP DCT - SS DPs & HFC Mid Pipes/X-Over - E Race Muffs - 19" MT DRs... On to a new home.
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07-01-2014, 09:13 AM	#4
Brci New Member 6 Rep 8 Posts Drives: M5 - individual Join Date: Mar 2014 Location: Europe iTrader: (0)	thank you so much for the answers
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07-02-2014, 08:58 AM	#6
thebishman Major 550 Rep 1,164 Posts Drives: ‘24 iX M60 Join Date: Sep 2012 Location: Overland Park, KS iTrader: (0)	Some ultra high performance street tyres have small 'triangles' slightly raised on the top of the sidewall tread showing where the maximal contact patch should be. If you aren't noticing that the tread wear is coming over to those triangles you are over inflated; if the tread wear is past the triangles, then you are under inflated. Just another data point to use. What is the gold standard of course is tyre temperature which you should have someone measure for you in the hot pits. You will be attempting to have the same hot temperatures across the whole of the contact patch. Furthermore, remember that you most probably will have to have different psi in the tyres, front, rear, side to side, depending on the layout of the track and whether it is clockwise versus anti clockwise. Taking the time to get tyre pressures right is vital not just for safety or increased speeds and better handling, but also in tyre longevity. Having a $400 tyre 'chunk', (throw off tread blocks), and be ruined makes for a very expensive weekend! lol Good luck and have fun.
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