BMW M3 Forum (E90 E92)

BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read


Go Back   M3Post - BMW M3 Forum > E90/E92 M3 Technical Topics > Wheels + Tires Sponsored by The Tire Rack
  TireRack

KEEP M3POST ALIVE BY DOING YOUR TIRERACK SHOPPING FROM THIS BANNER LINK!
Post Reply
 
Thread Tools Search this Thread
      12-01-2011, 12:57 AM   #1
rourkem
Enlisted Member
 
Drives: 2012 M3 Coupe
Join Date: Nov 2011
Location: Burlingame, CA

Posts: 32
iTrader: (0)

Recommended Tire Pressures (Track / Spirited Driving)

What tire pressures would you recommend for general spirited driving? Assume I want to fine one level that works well enough for 100+ "casual" track driving but also general commuting which can be fast and agressive when overtaking people but generally settles to below 80mph.

I don't need a cushy road feel, but don't want a pressure setting that will negatively impact tire life in a big way. I also
__________________
2012 E92 M3 JZB | Fox Red Ex | ZCP | PP | CWP | 6MT (on order)
2005 E46 M3 Carbon Black | Cinnamon Leather | PP | SMG2 | Moonroof | HK | CWP
Retired: 2002 330Ci SP, PP, 5MT, Orient Blue & Sand Leather

Last edited by rourkem; 12-01-2011 at 04:38 AM. Reason: add emphasis to avoid confusion
rourkem is offline  
0
Reply With Quote
      12-01-2011, 03:08 AM   #2
Elementary
If you ain't first, you're last!
 
Drives: M Drei
Join Date: Aug 2011
Location: California

Posts: 112
iTrader: (0)

Who drives on the street casually at 100+?

Take it to a track, save a life and money in tickets.
Elementary is offline  
0
Reply With Quote
      12-01-2011, 04:37 AM   #3
rourkem
Enlisted Member
 
Drives: 2012 M3 Coupe
Join Date: Nov 2011
Location: Burlingame, CA

Posts: 32
iTrader: (0)

Quote:
Originally Posted by Elementary View Post
Who drives on the street casually at 100+?

Take it to a track, save a life and money in tickets.
Not I. I said I drove on a TRACK causally at 100+.

I say "casually" to differentiate from what I did 5 years ago when I had a separate set of tires at a very specific pressure for the track. I take it quite a bit less seriously now as it's more a fun thing to do and a way to enjoy my car at high speed in relative safety.
__________________
2012 E92 M3 JZB | Fox Red Ex | ZCP | PP | CWP | 6MT (on order)
2005 E46 M3 Carbon Black | Cinnamon Leather | PP | SMG2 | Moonroof | HK | CWP
Retired: 2002 330Ci SP, PP, 5MT, Orient Blue & Sand Leather
rourkem is offline  
0
Reply With Quote
      12-01-2011, 04:53 AM   #4
luis_m3
Low Pro...
 
Drives: 2011 E90 AW
Join Date: Dec 2010
Location: Arizona

Posts: 965
iTrader: (0)

I set my PS2s to 35/36 (cold)... they feel good "to me" both at the track and DD.
luis_m3 is offline   United_States
0
Reply With Quote
      12-01-2011, 10:07 AM   #5
auggiem3
Captain
 
auggiem3's Avatar
 
Drives: e92 M3 / former e46 M3 owner
Join Date: Jan 2009
Location: Washington, DC

Posts: 600
iTrader: (1)

Quote:
Originally Posted by luis_m3 View Post
I set my PS2s to 35/36 (cold)... they feel good "to me" both at the track and DD.
How can you run your tires at a cold 35/36 on a track day?

My PS2s need to drop down to 20-22 cold psi to keep them below 40-42 hot psi on track runs.

I ran them at a cold 26-28 psi last year and tested to a scary 52 psi after two 20 minute track sessions on a mild day (60 degrees f).

If I would have started at 35, I would have well exceeded the maximum pressure and probably experienced a blowout assuming I didn't lose it from lack of grip...
auggiem3 is offline   United_States
0
Reply With Quote
      12-01-2011, 10:38 AM   #6
jphughan
Brigadier General
 
jphughan's Avatar
 
Drives: 2011.75 M3 E92 6MT
Join Date: Mar 2011
Location: Austin, TX

Posts: 3,020
iTrader: (0)

Quote:
Originally Posted by auggiem3 View Post
How can you run your tires at a cold 35/36 on a track day?

My PS2s need to drop down to 20-22 cold psi to keep them below 40-42 hot psi on track runs.

I ran them at a cold 26-28 psi last year and tested to a scary 52 psi after two 20 minute track sessions on a mild day (60 degrees f).

If I would have started at 35, I would have well exceeded the maximum pressure and probably experienced a blowout assuming I didn't lose it from lack of grip...
You wouldn't have this problem if you used nitrogen rather than air. My dealer filled the tires with nitrogen for free, didn't even have to ask.
__________________
11 M3 E92 Le Mans | Black Nov w/ Alum | 6MT | Premium 2 | Convenience | 19" | EDC | Prem Audio | Moonroof | BMW Apps | Vorshlag Adjustable Camber Plates | StopTech ST-60 380mm BBK | Castrol SRF Fluid | ModMyNav.com rear camera | OEM Euro Sunglasses Holder

Last edited by jphughan; 12-01-2011 at 11:02 AM.
jphughan is online now   United_States
0
Reply With Quote
      12-01-2011, 11:00 AM   #7
luis_m3
Low Pro...
 
Drives: 2011 E90 AW
Join Date: Dec 2010
Location: Arizona

Posts: 965
iTrader: (0)

Quote:
Originally Posted by auggiem3 View Post
Quote:
Originally Posted by luis_m3 View Post
I set my PS2s to 35/36 (cold)... they feel good "to me" both at the track and DD.
How can you run your tires at a cold 35/36 on a track day?

My PS2s need to drop down to 20-22 cold psi to keep them below 40-42 hot psi on track runs.

I ran them at a cold 26-28 psi last year and tested to a scary 52 psi after two 20 minute track sessions on a mild day (60 degrees f).

If I would have started at 35, I would have well exceeded the maximum pressure and probably experienced a blowout assuming I didn't lose it from lack of grip...
I track at the Nurburgring and take 20-30min breaks between laps. Also, weather temp makes a difference (45-50 the last two times). The pressure went up to 44 after 4 laps during my last visit; that was the highest.
luis_m3 is offline   United_States
0
Reply With Quote
      12-01-2011, 01:06 PM   #8
Merked M3
First Lieutenant
 
Merked M3's Avatar
 
Drives: E90 M3 6MT
Join Date: Apr 2011
Location: Sunnyvale, CA

Posts: 344
iTrader: (0)

I do not like to get the pressures higher than 42 HOT. So a good starting point is 32 rear and 34/36 front. If you are doing any hard braking go with 34.

I am pretty OCD about tire pressures at events, and I can tell you from experience that once the PSI gets over 42 you will start to loose traction. It was a hot day and the car started cutting loose under trail braking; after lowering the pressures to 38 HOT I had better traction again.
__________________
Merked M3 is offline   United_States
0
Reply With Quote
      12-01-2011, 01:16 PM   #9
rourkem
Enlisted Member
 
Drives: 2012 M3 Coupe
Join Date: Nov 2011
Location: Burlingame, CA

Posts: 32
iTrader: (0)

Interesting that there's such importance in temp when measuring. I remember that wen I used to fill to a specific temp for the track I used a small portable pump powered from the cig lighter outlet to make sure I was measuring the "cold" level.

I'm a bit less anal now and generally drive the ten blocks of so to a service station and fill it up then. Should I consider that a hot, cold or in-between temp? Would it be better for me to fill up after driving a bit more?
__________________
2012 E92 M3 JZB | Fox Red Ex | ZCP | PP | CWP | 6MT (on order)
2005 E46 M3 Carbon Black | Cinnamon Leather | PP | SMG2 | Moonroof | HK | CWP
Retired: 2002 330Ci SP, PP, 5MT, Orient Blue & Sand Leather
rourkem is offline  
0
Reply With Quote
      12-01-2011, 01:19 PM   #10
elh0102
Captain
 
Drives: E92 M3
Join Date: Apr 2010
Location: USA

Posts: 704
iTrader: (0)

Almost every high performance street tire I have used on cars of generally balanced weight distribution have worked well at around 38 hot. Obviously, cold pressure will vary greatly, depending on temperature and use. If I’m checking pressures cold, for street use, I’ll usually set them at 35. For track, starting pressure could be in the upper 20’s to low 30’s.
__________________
2011 Space Gray Coupe, DCT, ZCP, StopTech ST-60/ST-40 BBK.
elh0102 is offline  
0
Reply With Quote
      12-01-2011, 01:22 PM   #11
persian54
Lieutenant General
 
persian54's Avatar
 
Drives: SL550. Prev: E93 M3/335i/Z435i
Join Date: Jun 2009
Location: The Valley, SoCal

Posts: 15,667
iTrader: (281)

For my CS3s, I ran 32-33 cold if it wasn't hot out, and reached about 40hot

if it was hot, i would run about 31cold

on my RS3s, I run 29 cold to reach a 40 hot
Dropped to 27 cold but it still went to 40 hot lol.
persian54 is offline   United_States
0
Reply With Quote
      12-01-2011, 01:37 PM   #12
Merked M3
First Lieutenant
 
Merked M3's Avatar
 
Drives: E90 M3 6MT
Join Date: Apr 2011
Location: Sunnyvale, CA

Posts: 344
iTrader: (0)

Quote:
Originally Posted by rourkem View Post
Interesting that there's such importance in temp when measuring. I remember that wen I used to fill to a specific temp for the track I used a small portable pump powered from the cig lighter outlet to make sure I was measuring the "cold" level.

I'm a bit less anal now and generally drive the ten blocks of so to a service station and fill it up then. Should I consider that a hot, cold or in-between temp? Would it be better for me to fill up after driving a bit more?
10 blocks is "cold" especially if it's just city driving. You could always check the pressures when you leave the house and when you get there, minus whatever they heated for the true cold temp, and that would be the ultimate M3 nerd solution.

"Hot" would be after 30 minutes of driving including some highway OR just a few minutes of spirited driving w/ hard braking and acceleration. Once on a sunny day I heated up my tires from 32r/36f to 38r/42f in literally 1min30seconds because there was a large braking zone (was competition.)
__________________
Merked M3 is offline   United_States
0
Reply With Quote
      12-01-2011, 09:23 PM   #13
ShadeD1
First Lieutenant
 
Drives: 2010 Jerez Black E92 DCT
Join Date: Feb 2010
Location: Houston, TX

Posts: 319
iTrader: (0)

On Hoosier R6 34-35 hot
On Yokohama AD08 38 hot
__________________
Evolve Tune, Ground Control Suspension, Stoptech BBK 380/355, Square 18x10 Nitto NT01
ShadeD1 is offline   United_States
0
Reply With Quote
      12-01-2011, 09:32 PM   #14
Ateam
Banned
 
Drives: M3
Join Date: Sep 2011
Location: USA

Posts: 1,109
iTrader: (0)

Quote:
Originally Posted by auggiem3 View Post
How can you run your tires at a cold 35/36 on a track day?

My PS2s need to drop down to 20-22 cold psi to keep them below 40-42 hot psi on track runs.

I ran them at a cold 26-28 psi last year and tested to a scary 52 psi after two 20 minute track sessions on a mild day (60 degrees f).

If I would have started at 35, I would have well exceeded the maximum pressure and probably experienced a blowout assuming I didn't lose it from lack of grip...
Just so everyone knows the usual 50 or 52 listed on a tire as "max" psi is a COLD psi value. 50 is not the max when it is a hot temperature. Not saying you run it to 50 cold but a tires "max" when hot is much closer to 75 psi range as they are pretty conservative when listing a max cold psi.

Also never heard so many people using "hot" psi measurements to guage tire pressure. Bmw specifies 35 psi cold on all 4 corners
Ateam is offline  
0
Reply With Quote
      12-01-2011, 09:54 PM   #15
ShadeD1
First Lieutenant
 
Drives: 2010 Jerez Black E92 DCT
Join Date: Feb 2010
Location: Houston, TX

Posts: 319
iTrader: (0)

Quote:
Originally Posted by Ateam View Post
Also never heard so many people using "hot" psi measurements to guage tire pressure. Bmw specifies 35 psi cold on all 4 corners
track junkies doing DE's usually measure their tire pressures after a 20-30 min run session. I find that my car feels best to me if I come off track at around 38 psi on street tires and 34 psi on slicks. Of course YMMV
__________________
Evolve Tune, Ground Control Suspension, Stoptech BBK 380/355, Square 18x10 Nitto NT01
ShadeD1 is offline   United_States
0
Reply With Quote
      12-02-2011, 01:11 AM   #16
luis_m3
Low Pro...
 
Drives: 2011 E90 AW
Join Date: Dec 2010
Location: Arizona

Posts: 965
iTrader: (0)

Quote:
Originally Posted by Ateam View Post
Just so everyone knows the usual 50 or 52 listed on a tire as "max" psi is a COLD psi value. 50 is not the max when it is a hot temperature.
I did not know that... good info! I always go by cold anyways, and check the pressure after a couple of laps around the track; just in case I guess.
luis_m3 is offline   United_States
0
Reply With Quote
      12-02-2011, 01:18 AM   #17
Ateam
Banned
 
Drives: M3
Join Date: Sep 2011
Location: USA

Posts: 1,109
iTrader: (0)

Quote:
Originally Posted by ShadeD1 View Post
track junkies doing DE's usually measure their tire pressures after a 20-30 min run session. I find that my car feels best to me if I come off track at around 38 psi on street tires and 34 psi on slicks. Of course YMMV
Thanks I did not know that is what the track people do! For regular non-track driving its typically the "cold" psi people go by and what is reccomended. Guess it makes more sense on the track because depending on how hard you push the car, the hot psi could vary quite a bit, whereas on the street you are probably pretty consistently getting the same "warm" temperature and psi in your tires as there is limits to city driving.
Ateam is offline  
0
Reply With Quote
      12-02-2011, 08:44 AM   #18
klammer
Brigadier General
 
Drives: 11 spc gry m3 e90, 07 X5
Join Date: Jan 2010
Location: chicago

Posts: 3,184
iTrader: (0)

I run around 40-42 hot on AD08's on track, anything over that and the wheels get a bit greasy on track. Our cars are sooo sensitive to tire pressure that it is really a personal preference thing. Took me a full year of track days (20 events) to really dial this in for me, but man, when you get that right, neutral setup, this car can just take a beating on track. Street driving I usually just add a few PSI as I will NEVER get my tires as hot off track as I will on. In response to those that run really low PSI and still get high hot readings, have heard that under inflating adds more rolling resistance and the like which can heat up the tires faster and hotter than a higher more proper temp. Just like our M's it's about balance and precision, might take some time, but just another way to really learn/know our cars, just another level of connection, enjoy
__________________
mods: akra evo, dinan 3.45 diff, ess akra tune, dinan stg.3, Alcon bbk, HRE P40
klammer is offline  
0
Reply With Quote
      12-02-2011, 11:40 AM   #19
asw19
Enlisted Member
 
Drives: 08 E92 Silver
Join Date: Sep 2010
Location: saturn

Posts: 49
iTrader: (0)

My local dealer in Houston just returned my car to me after scheduled service with my front left tire at 72PSI.

The car was pulling to the right and the road noise was noticably higher, so I let some air out...didnt have a guage. Still pulling right so I let out more. At this point I was just guessing high pressure because they added air to that tire right before I left.

When I got home I put the guage on it and it was 69PSI after letting the air out.
asw19 is offline  
0
Reply With Quote
      12-02-2011, 01:18 PM   #20
auggiem3
Captain
 
auggiem3's Avatar
 
Drives: e92 M3 / former e46 M3 owner
Join Date: Jan 2009
Location: Washington, DC

Posts: 600
iTrader: (1)

Quote:
Originally Posted by klammer View Post
I run around 40-42 hot on AD08's on track, anything over that and the wheels get a bit greasy on track. Our cars are sooo sensitive to tire pressure that it is really a personal preference thing. Took me a full year of track days (20 events) to really dial this in for me, but man, when you get that right, neutral setup, this car can just take a beating on track. Street driving I usually just add a few PSI as I will NEVER get my tires as hot off track as I will on. In response to those that run really low PSI and still get high hot readings, have heard that under inflating adds more rolling resistance and the like which can heat up the tires faster and hotter than a higher more proper temp. Just like our M's it's about balance and precision, might take some time, but just another way to really learn/know our cars, just another level of connection, enjoy
Thanks Klammer - so many variables impact pressure (ambient temp, track temp, weight deltas associated with instructors, driving styles and most obviously the track itself).

I agree that something in the hot high 30s feels best on my e92 but I backed into my cold pressure the old fashioned way....ran sessions and released hot air until I got it to the right feel (about 38-40 hot psi). Then let her cool off over night and tested cold in the am (actually TPS went off before I even got out of the parking lot)....22 cold on all 4 corners.
auggiem3 is offline   United_States
0
Reply With Quote
      12-02-2011, 01:44 PM   #21
Mr. ///M3 RD
Major General
 
Mr. ///M3 RD's Avatar
 
Drives: E350 & 280 SL on Weekends :)
Join Date: May 2010
Location: GTA, Ontario - Canada

Posts: 7,859
iTrader: (0)

Garage List
Quote:
Originally Posted by rourkem View Post
What tire pressures would you recommend for general spirited driving? Assume I want to fine one level that works well enough for 100+ "casual" track driving but also general commuting which can be fast and agressive when overtaking people but generally settles to below 80mph.

I don't need a cushy road feel, but don't want a pressure setting that will negatively impact tire life in a big way. I also
I recommend driving normal on the streets and when on the track use track wheels and tires and talk to other track fellows driving similar or the same car as yours ... driving on streets like you describe is not legal and eventually you might hurt yourself or someone else.

Besides you give all of us a bad name if you drive reckless on the street.
__________________
Cheers, Rolf-Dieter

Life will take us to some interesting places, fortunately The ///M3 will too with a many of us know this very well
---> Click here for some good stuff I found
Mr. ///M3 RD is offline   Canada
0
Reply With Quote
      12-02-2011, 06:49 PM   #22
sarddenso
Private First Class
 
Drives: E90 M3
Join Date: Sep 2011
Location: Sydney

Posts: 114
iTrader: (0)

Quote:
Originally Posted by asw19 View Post
My local dealer in Houston just returned my car to me after scheduled service with my front left tire at 72PSI.

The car was pulling to the right and the road noise was noticably higher, so I let some air out...didnt have a guage. Still pulling right so I let out more. At this point I was just guessing high pressure because they added air to that tire right before I left.

When I got home I put the guage on it and it was 69PSI after letting the air out.

Glad you made it home ok!
I know on PS2's they say 50PSI max!
sarddenso is offline  
0
Reply With Quote
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 09:00 PM.




m3post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST