Michelin PSS

[simpelton]

What pressures you all running? Mine are 36 psi according to the TPM. Have not calibrated or changed pressures since receiving. Will pump up to 39 am thinking.

[robbo mcs]

Hi,

I run 32 cold (ie checked first thing in the morning before being driven), which warms up to around 34-36 warm. This is what is recommended on the tyre placard (2.2bar for two passengers, which is 31.9psi).

My car came from the dealer with 40psi cold, and the handling and traction was noticeably worse. I actually find that this car / tyre combination is very sensitive to pressure, particularily for rear wheel traction under heavy throttle. I found a lot more DSC intervention / wheelspin at the higher pressures

[simpelton]

Interesting, was told that I'll increase wear by running at 39 or even 41 but good to know your thoughts. I looked at the placard but did not understand our take the time to interpret bars into psi. Will try running at various pressures including 32 cold to see the difference. Cheers

Edit: meant to say decrease wear by increasing to 39 or 41

[brownb_2]

why not just run the stock pressures?
only reason for playing with that would be if youre tracking or dragging i thought? but it will affect wear.

on a side note, to the F80 come with TPMS? like actual pressure sensors in the wheels? or like our E90s just have the Flat tyre monitor that measures rolling speed of the wheels to guess a tyre is flat?

[Stuart@BMRAutowerkes]

Originally Posted by brownb_2

on a side note, to the F80 come with TPMS? like actual pressure sensors in the wheels? or like our E90s just have the Flat tyre monitor that measures rolling speed of the wheels to guess a tyre is flat?

'TPMS' (with sensors in the wheels) is an option.

If it's not optioned, then it will run off ABS like the E9X platform

[simpelton]

The F80 had it as an option. I.e. pressure sensors in the wheels. F80 LCI - its standard.

No reason not to run recommended pressures. My pressures out of show room were 36. Seems 32 is the recommended (based on carriage of two passengers).

Was looking for observations by those running different pressures on tyre wear and car dynamics.

[purecrema]

Most of the performance driving courses recommend >38

[robbo mcs]

Originally Posted by simpelton

The F80 had it as an option. I.e. pressure sensors in the wheels. F80 LCI - its standard.

No reason not to run recommended pressures. My pressures out of show room were 36. Seems 32 is the recommended (based on carriage of two passengers).

Was looking for observations by those running different pressures on tyre wear and car dynamics.

Tyre wear is completely different to handling and dynamics. You will get better tyre wear (and fuel economy) by running a higher pressure in the high 30's, but it will be at the expense of vehicle dynamics.

[simpelton]

Did they mention why >38?

Originally Posted by purecrema

Most of the performance driving courses recommend >38

[simpelton]

Originally Posted by robbo mcs

Tyre wear is completely different to handling and dynamics. You will get better tyre wear (and fuel economy) by running a higher pressure in the high 30's, but it will be at the expense of vehicle dynamics.

Am aware of that. So I assume running 32 provides greater surface contact with the road but also increases wear.

Running >38 will reduce wear and reduce contact and thus dynamics? I have a friend that runs 41 because he likes riding with a "stiffer side wall" (275 section but different tyre).
Makes no sense to me, side walls stiffness would be based on manufacturing design and process and to my mind, higher pressures or stiffer side walls (regardless of any correlation) would cause the car to skip over undulations in the road?!?!?!

Perhaps no difference on track until the tyres are well over

[AC-S]

I think my TPS option was $500, you get pressure and temperature on the display which is cool

[slowie]

32 is purely for comfort.

36-38 for spirited driving.

[robbo mcs]

Originally Posted by slowie

32 is purely for comfort.

36-38 for spirited driving.

If your idea of spirited driving is losing traction and hanging the tail out.

Way more grip at 32 cold (around 35-36 hot on the street).

I've tested at the track with pyrometers as well, 35 hot is where it is at for lap times. On the track that means starting somewhere from 24-30 cold depending on how hard you drive.

[simpelton]

Sweet...I'll muck around with the pressures over the next few months and see what I like

[Hazey82]

If your going to do any sort of hard driving and you do actually push the car, >38 cold and you will be up into the high 40s. Great for reducing sidewall scrub which looks horrible but not so good for the middle of your tyre (increased wear)

[WAY]

Originally Posted by robbo mcs

If your idea of spirited driving is losing traction and hanging the tail out.

Way more grip at 32 cold (around 35-36 hot on the street).

I've tested at the track with pyrometers as well, 35 hot is where it is at for lap times. On the track that means starting somewhere from 24-30 cold depending on how hard you drive.

100% agree. Need to run these cars at fairly low pressure. I also run 32 cold. Also, the ride of these things get a bit jiggly if you go up to 38+!

TPMS used to be an option but now it's standard.

[slowie]

Originally Posted by WAY

100% agree. Need to run these cars at fairly low pressure. I also run 32 cold. Also, the ride of these things get a bit jiggly if you go up to 38+!

TPMS used to be an option but now it's standard.

I'm running 295/275/19 combo.

Would 32 still apply?

[Xtabi]

Originally Posted by brownb_2

why not just run the stock pressures?
only reason for playing with that would be if youre tracking or dragging i thought? but it will affect wear.

on a side note, to the F80 come with TPMS? like actual pressure sensors in the wheels? or like our E90s just have the Flat tyre monitor that measures rolling speed of the wheels to guess a tyre is flat?

You forgot one reason to adjust the tire pressure.

3.) Curb jumping...