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      11-09-2021, 02:19 AM   #1
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first ever track day in the G80

I went to Streets of Willow (CW) this Saturday for the first time (ever) in the G80. Incredible experience. Car was completely bone stock and handled great. No issues.

The instructor was really impressed by how capable the car was (even at the hands of a mediocre driver like myself lol). Best lap time was 1:30:15.

My only complaint was that the P Zeros started to lose a ton of grip after about 5 laps or over 150F, but perhaps someone with more track experience can speak to that or why that is.

Anyways, let's get to the good stuff.




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      11-11-2021, 03:45 PM   #2
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Very nice! It seems like you had a great time!

M3s of all generations are the perfect jack of all trades. In a single car you can tear it up at the track and then drop your kids off at school, pick up your inlaws from the airport, etc etc

The tires that come with the car are not designed for the track. There are some track worthy tires that are perfectly streetable, like the RS4, RT660, RE71, A052, etc etc. Those will maintain their performance with more extended track use and are friendly enough to drive every day
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      11-11-2021, 09:57 PM   #3
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Quote:
Originally Posted by mlc50 View Post
My only complaint was that the P Zeros started to lose a ton of grip after about 5 laps or over 150F, but perhaps someone with more track experience can speak to that or why that is.
Maybe your pressures were too high? I found the most grip was around 150-170 F.

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Originally Posted by SYT_Shadow View Post
M3s of all generations are the perfect jack of all trades. In a single car you can tear it up at the track and then drop your kids off at school, pick up your inlaws from the airport, etc etc
Have you ordered your G80 yet?
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      11-12-2021, 09:53 AM   #4
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You need to manage your tire pressures. Buy yourself a good tire pressure gauge and let some air out when they over heat

The turn to jelly when hot and pressure gets too
High

PZeros are perfectly fine for someone doing their first or occasional track day. No need for
Track tires at this point. Invest in your driving skills first with more track days and instruction

Track tires will over heat too and need to their pressures to be managed carefully also
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      11-13-2021, 01:15 AM   #5
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Quote:
Originally Posted by Ximian View Post
Maybe your pressures were too high? I found the most grip was around 150-170 F.



Have you ordered your G80 yet?
I also kinda realized I made this mistake after the fact. Was running 33-32PSI cold so probably like 37-40 hot *facepalm*. What pressure do you run cold before hopping on the track?
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      11-13-2021, 01:20 AM   #6
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Quote:
Originally Posted by SYT_Shadow View Post
Very nice! It seems like you had a great time!

M3s of all generations are the perfect jack of all trades. In a single car you can tear it up at the track and then drop your kids off at school, pick up your inlaws from the airport, etc etc

The tires that come with the car are not designed for the track. There are some track worthy tires that are perfectly streetable, like the RS4, RT660, RE71, A052, etc etc. Those will maintain their performance with more extended track use and are friendly enough to drive every day
Thank you! Bucket list experience for sure.

I realized I was not managing my PSI correctly, but still in my newb opinion I agree. These P Zeros overheat/degrade very quickly on a more tight/technical track.
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      11-13-2021, 01:21 AM   #7
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Quote:
Originally Posted by mlc50 View Post
I also kinda realized I made this mistake after the fact. Was running 33-32PSI cold so probably like 37-40 hot *facepalm*. What pressure do you run cold before hopping on the track?
BMW says not go below 27 so started with that after the initial warm up. I got it up to a good warm temperature (150F) and readjusted to below the stock pressure so when hot, it'll be at the stock pressure. Took 2-3 stops into the hot pits to get the just the right pressure, but I got the hang of it quickly afterwards for the next days. Just can't let the tires cool off otherwise you'll be below 27 PSI.

You do have the pressure and temperature monitoring screen on the car - isn't it one of the default views in Sport mode?
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      11-13-2021, 01:27 AM   #8
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Quote:
Originally Posted by Ximian View Post
BMW says not go below 27 so started with that after the initial warm up. I got it up to a good warm temperature (150F) and readjusted to below the stock pressure so when hot, it'll be at the stock pressure. Took 2-3 stops into the hot pits to get the just the right pressure, but I got the hang of it quickly afterwards for the next days. Just can't let the tires cool off otherwise you'll be below 27 PSI.

You do have the pressure and temperature monitoring screen on the car - isn't it one of the default views in Sport mode?
Thank you that's helpful.

Yup I had it open I just have a poor memory lol.

So you're shooting for stock temps (33 - 32PSI) while the tires are hot? I guess I figured the cold temps were already factoring in some buffer for heating up.
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      11-13-2021, 09:29 AM   #9
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Tire operating ranges are dependent on the weight of your vehicle and the tire optimal grip temps.

The optimal temperature is static so the manufacturer would specify the right hot temp, then you need to take temperatures across the tread to see of youre over or under inflated. Hi temps in middle too high, etc..

Cold pressure is just a reference starting point.

I.e on my Michelin cup2 the optimal temp range is 180-200. And pressure for the g82 load range is 32- 33 psi hot as provided by jackson motorsports

In order to achieve that, I need to start at 26 cold. Another way is to start at 30 cold and continuously air down as the tire heats up.

When the tires get to 220 and higher they have much lower grip, so temp management is key.


Also, the in car tire temps are about 15 degrees lower than tire surface temps. The in wheel sensor is reading air temp inside the wheel. I have cup2 connects with the sensors on the tire and they measure hotter always. So you need to add about 15 degrees to what tpms reports

Edit, you should also chalk you shoulders to see if your wearing to the right spot, too low add pressure, too high, reduce.
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      12-09-2021, 01:30 PM   #10
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Quote:
Originally Posted by beachBmmr View Post
Tire operating ranges are dependent on the weight of your vehicle and the tire optimal grip temps.

The optimal temperature is static so the manufacturer would specify the right hot temp, then you need to take temperatures across the tread to see of youre over or under inflated. Hi temps in middle too high, etc..

Cold pressure is just a reference starting point.

I.e on my Michelin cup2 the optimal temp range is 180-200. And pressure for the g82 load range is 32- 33 psi hot as provided by jackson motorsports

In order to achieve that, I need to start at 26 cold. Another way is to start at 30 cold and continuously air down as the tire heats up.

When the tires get to 220 and higher they have much lower grip, so temp management is key.


Also, the in car tire temps are about 15 degrees lower than tire surface temps. The in wheel sensor is reading air temp inside the wheel. I have cup2 connects with the sensors on the tire and they measure hotter always. So you need to add about 15 degrees to what tpms reports

Edit, you should also chalk you shoulders to see if your wearing to the right spot, too low add pressure, too high, reduce.
this is golden set of tips.

Thank you.
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