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Track day

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Viren
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Track day

Post by Viren » Mon Jul 02, 2018 11:45 am

I'm off to bedford autodrome next Monday and was curious what tyre pressures people are finding work on track? Usually start with 30-32 which ends up at late 30's. But heard some people run quite a bit more from cold.

Also if your there feel free to pop by and say hello, I'll be in a blue z4m.

Fyi I run 18s on standard tyres.
07 Z4MC standard spec

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R60BBA
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Post by R60BBA » Mon Jul 02, 2018 11:56 am

That’s too high.

I recommend 28 on the fronts and 30 on the rears.
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Viren
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Track day

Post by Viren » Mon Jul 02, 2018 12:45 pm

R60BBA wrote: Mon Jul 02, 2018 11:56 am That’s too high.

I recommend 28 on the fronts and 30 on the rears.
Assume those a cold pressures?
07 Z4MC standard spec

brillomaster
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Post by brillomaster » Mon Jul 02, 2018 1:12 pm

i run 33/36 hot. which normally equates to about 25/28 cold.

best thing to do would be to get a tyre pressure gauge, then come in when the tyres are warm and see what the pressures are. but on road tyres you'll know when you've overheated them as they'll lose a lot of grip and you'll start to push. similar situation if the front tyre pressures get too high.

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exdos
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Post by exdos » Mon Jul 02, 2018 1:22 pm

I keep checking pressures and find that 30/32 when hot gives the best grip and using a IR thermometer these pressures give the best temperature gradients across the full width of the tyres. :thumbsup:

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Post by R60BBA » Mon Jul 02, 2018 1:33 pm

Viren wrote: Mon Jul 02, 2018 12:45 pm
R60BBA wrote: Mon Jul 02, 2018 11:56 am That’s too high.

I recommend 28 on the fronts and 30 on the rears.
Assume those a cold pressures?
Yep.

Enjoy your track day :thumbsup:
Current: 2002 E46 M3
Current: 2004 R53 Cooper S
Current: 2005 997 Carrera S
Gone: 1998 E31 840Ci Sport
Gone: 2007 Z4 E86 3.0Si Sport
Gone: 2001 Z3 E36/7 2.2i San Remo Individual
Gone: 2015 F21 116d M Sport
Gone: 2012 A3 Sportback 1.2TFSI

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Post by Vanne » Mon Jul 02, 2018 6:13 pm

28/29 cold. :wink:
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Post by Viren » Mon Jul 02, 2018 7:47 pm

You guys are awesome, thanks!
07 Z4MC standard spec

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TomK
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Post by TomK » Tue Jul 03, 2018 3:03 pm

The correct answer is as exdos alluded to is that... there is no correct answer.
It depends on so many things, your tyres, your driving style, etc. It's all about getting the correct pressures when your tyres are hot and have been worked.
So drop the psi by say 2 at least all round before going out, do a few laps. Come back in and as quickly as possible check the pressures and adjust accordingly. Again exdos' suggested would be a good starting point. You'll find for instance that the front left will be most likely a couple of psi higher than the right, balance it all out.
Enjoy!
Eta, sorry I misread the post slightly! Generally on track I find that running lower than stock is better for me, so I aim for no more than 30 hot, and usually 28 on the front. Again though there is no right answer really, small adjustments can make a difference to the balance, it's a personal preference and depends on the spec of your car (geo).
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Post by bradz » Tue Jul 03, 2018 10:54 pm

Basically what has been said above.

If you have any issues on the day send me a PM, I'm local with a garage full of tools and a few spares!

Adam
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Post by Viren » Wed Jul 04, 2018 4:50 pm

bradz wrote: Tue Jul 03, 2018 10:54 pm Basically what has been said above.

If you have any issues on the day send me a PM, I'm local with a garage full of tools and a few spares!

Adam
Thats really nice of you! Hopefully I won't need to though!
07 Z4MC standard spec

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Post by BMWZ4MC » Thu Jul 05, 2018 12:41 pm

TomK wrote: Tue Jul 03, 2018 3:03 pm The correct answer is as exdos alluded to is that... there is no correct answer.
It depends on so many things, your tyres, your driving style, etc. It's all about getting the correct pressures when your tyres are hot and have been worked.
So drop the psi by say 2 at least all round before going out, do a few laps. Come back in and as quickly as possible check the pressures and adjust accordingly. Again exdos' suggested would be a good starting point. You'll find for instance that the front left will be most likely a couple of psi higher than the right, balance it all out.
Enjoy!
Eta, sorry I misread the post slightly! Generally on track I find that running lower than stock is better for me, so I aim for no more than 30 hot, and usually 28 on the front. Again though there is no right answer really, small adjustments can make a difference to the balance, it's a personal preference and depends on the spec of your car (geo).
I’m with Exdos and Tom.

In general, I run my Zed around 30C hot front and rear, and my Westfield about 20C hot on the track.
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