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      12-06-2018, 05:20 PM   #1
codylikerice
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Tyre Temps & Pressure on Track

Hi guys,

Anyone have data or preferred temps & pressures when on track?

I'm running MPS4S, but I don't know what the 'optimal' operating temps are. The tyres get greasy at high temps but I feel my experience is anecdotal and wonder if anyone knows what it is.

I try to keep the pressure around 2.5 bar when 'hot'.

What's your experience, either if you use the MPS4S on track, or others, what's your target pressure and temps?
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      12-06-2018, 06:09 PM   #2
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Quote:
Originally Posted by codylikerice View Post
Hi guys,

Anyone have data or preferred temps & pressures when on track?

I'm running MPS4S, but I don't know what the 'optimal' operating temps are. The tyres get greasy at high temps but I feel my experience is anecdotal and wonder if anyone knows what it is.

I try to keep the pressure around 2.5 bar when 'hot'.

What's your experience, either if you use the MPS4S on track, or others, what's your target pressure and temps?
I try to run mine at 35 psi hot.
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      12-07-2018, 08:20 PM   #3
booya_45
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Originally Posted by landapanda View Post
I try to run mine at 35 psi hot.

Thats what I try to do as well.

Last edited by booya_45; 12-20-2018 at 05:46 PM..
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      12-15-2018, 05:33 PM   #4
codylikerice
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Do you guys try to run those PSI regardless of what tyre or size you are using?
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      12-15-2018, 09:41 PM   #5
GasBurnlife(landapanda)
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Quote:
Originally Posted by codylikerice View Post
Do you guys try to run those PSI regardless of what tyre or size you are using?
I'd say so, yes. Look through a few threads here and you'll see some tires like 33s, while others mid to high 30s. But 35 hot is a good starting point.
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      12-16-2018, 12:06 AM   #6
chiefsubjugator
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Same here, 35PSI hot.
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      12-16-2018, 08:19 PM   #7
pruettfan
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I have a couple of days on the PS 4S on track, 34-36 seems to be fine for pressures. They are decent on track but rather than tearing up my daily tires I went with a dedicated set of wheels and tires (cup2) and that has been a very nice track mod. The car is much more stable under heavy braking then with the 4S, not that the 4S is terrible.
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      12-17-2018, 06:48 PM   #8
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Yes i used to run ps4s on track but I found they got incredibly greasy at high temps and would overheat too quick for my liking.

I switched to cup2 for track and as would be obvious the higher temp performance is much better.

Ran 35ish-37ish hot and it seemed to work, although started at 28ish cold.

I run large tyres on the stock wheels tho, 265/35R19 front and 285/35/R19 rear.

Worked well
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      12-19-2018, 02:19 PM   #9
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I started running RE71s at around 30psi hot and like the way they are wearing better than at the higher pressures.

Bottom line, just experiment and keep an eye on wear and rollover.
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      12-24-2018, 10:32 AM   #10
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I've run the 4S on track. Even at 35-36 PSI, they'd grease-up during early in the 20 min sessions. Eventually went to the 71R on track rims. Much better. That said, if it's going to rain all weekend, I'll leave the 4S on. Really good on a wet track.
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      01-02-2019, 01:20 PM   #11
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36pis+ starts getting squirrelly IMO. Some people seem to run like 40psi+ though so this might be a subjective topic... or people are just clueless and you should test for yourself.

I personally bleed down between sessions to try to hit 34 front 32 rear running Hankook (80tw td's). I usually go on at around 26psi and the front pick up the extra 2psi due to turning... I seem to get more grip running pressure on the lower side. No clue why this is such a confusing topic as logically it makes sense that less pressure = more grip. Lot's of conflicting articles though... depends on tire construction as well. Some tires won't be able to maintain shape with low pressure. Something like an re-71r has a soft sidewall that sees a lot of deflection...

Last edited by bbnks2; 01-02-2019 at 01:26 PM..
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      01-02-2019, 07:03 PM   #12
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Quote:
Originally Posted by bbnks2 View Post
36pis+ starts getting squirrelly IMO. Some people seem to run like 40psi+ though so this might be a subjective topic... or people are just clueless and you should test for yourself.

I personally bleed down between sessions to try to hit 34 front 32 rear running Hankook (80tw td's). I usually go on at around 26psi and the front pick up the extra 2psi due to turning... I seem to get more grip running pressure on the lower side. No clue why this is such a confusing topic as logically it makes sense that less pressure = more grip. Lot's of conflicting articles though... depends on tire construction as well. Some tires won't be able to maintain shape with low pressure. Something like an re-71r has a soft sidewall that sees a lot of deflection...
Are you on standard staggered set up? I normally see people target lower starting pressure on fronts and slightly higher rear, what's your opinion on running higher front and lower rear?

For me I find the front pressure increases more rapidly than the rears on track so setting lower front than rear seems to work for me
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      01-03-2019, 07:17 AM   #13
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Quote:
Originally Posted by codylikerice View Post
Are you on standard staggered set up? I normally see people target lower starting pressure on fronts and slightly higher rear, what's your opinion on running higher front and lower rear?

For me I find the front pressure increases more rapidly than the rears on track so setting lower front than rear seems to work for me
I might start at lower front than rear. It all depends on how much rise I get out of the front tires which really depends on the track. I bleed down so I see around 34/32 hot. I like to see 2psi more up front because I have a square wheel setup and neutral spring rates and sways. The higher front tire pressure helps keep the car balanced slightly toward under-steer and helps keep the front tires from rolling over too much.
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      01-04-2019, 02:48 PM   #14
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Higher pressures in the front by about 2 lb makes the car very neutral.
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