09-21-2021, 08:30 PM | #1 |
New Member
82
Rep 11
Posts |
First track event with my G80 M3 Comp
Got a chance to run my m3 at the local track this past weekend. Oh wow, I am impressed that such a big heavy car can do so much so well. Acceleration is strong, pulls hard out of corners. Brakes are firm and fade free. Trail braking is a breeze. Turn in is immediate and transitions are super quick with barely any scrubbing. The car corners so well for a 3800 lbs heavy weight. The carbon seats were amazing, held me in place. Engine and Exhaust sounds good, even though I think most of it is fake noise from the speakers.
The not so good, tire wear is pretty significant. Fuel consumption is scary, have to fill up after 2 sessions. Tank was full, did about 24 laps and computer said 20 miles remaining. I used 5 tanks of gas to commute to track and did about 60 laps. That’s like 2 mpg. Could also use a louder exhaust. Also, the front proximity sensors kept going off every time I braked with a car in front and one time it slammed on the brakes on its own. Super annoying. Here is a video. Question to those that track. 1.What tire pressures are you running, I was at 28psi cold, and after a session, tires are at 38psi and about 190 degF. 2.Worth going to stainless steel brake line? Pedal pressure is good with no fade. Also worth going to a more track focused pad? 3.Running stock wheel set up, was thinking about going to a square set up to facilitate rotation, would a square set up work? That is, I’d buy 2 rear wheels for the front. 4.anyway to turn off the brake proximity warning and intervention? It’s super annoying for it to chime every time I go into a corner with a car in front of me. And one time, it auto braked as it must have sensed too high a closing speed. Thanks in advance for your advice. |
09-21-2021, 09:29 PM | #2 |
Colonel
3768
Rep 2,700
Posts |
4. You have to turn off the safety stuff with the little button on the dash. (see pic)
You hold it for a few seconds to turn everything off.
__________________
Fun/HPDE: 2023 M3 6MT Individual Malachite
Past:2023 M4 CSL, 2022 M4C Vert, 2020 M340i, 2018 M2, 2015 M235i, 2008 135i 550whp Daily: 2023 X5 45e Daily/Family: 2021 Atlas Cross Sport 3.6 |
Appreciate
1
Pistolerom581.50 |
09-22-2021, 01:15 PM | #3 |
Track Rat
1760
Rep 403
Posts |
1. I use front 38psi, and rear 36psi HOT. Measured immediatly after every session, and adjusted as needed. 2 lower on the rear for a bit more grip on acceleration out of the turns.
2. Absolutely, and throw in some good quality high temp brake fluid too. 3. Individual choice with minimal noticable performance difference on a track unless you happen to have the skill level of a pro driver. In which case, what the Hell are you doing at an HPDE event? 4. Already covered.
__________________
IOMG // Full Tartufo Leather // MP HAS // Vorshlag Camber Plates // SS Brake Lines
|
Appreciate
1
Pistolerom581.50 |
09-22-2021, 08:28 PM | #4 |
Captain
1449
Rep 924
Posts |
I get 4 mpg while tracking. Started with a full tank and did just about 60 miles in one hour long session and had 20 mile range left.
In have thought about tires too, I did one day on my mps4s and ran 26 cold 38 hot. No issues with traction. Check your shoulders to see if they are wearing to the end of the shoulder treads, over too high, under too low.. I git a set of 963m wheels with cup2s and they are stickier. I mainly went that route to preserve my 4s set for daily driving. I might experiment with different tires over time. Next time I mount my track tires ill throw the rears up front and see whats what and of its even possible to run that size up front. They are .4% larger circumference and diameter than front
__________________
2023 F90 M5
Retired - 2021 G82, 2019 440xi, 2020 X7, 2019 X5, 2013 F10, 2010 F10 |
Appreciate
2
Pistolerom581.50 PLF693767.50 |
09-28-2021, 08:11 AM | #5 |
Lieutenant Colonel
2519
Rep 1,773
Posts |
Most of your questions depend on level of experience and how close to the limit you are driving. Keep it stock till you feel you are approaching that limit. Then make incremental changes. As for TP, haven't tracked a g80 yet but based on experience of cars with similar power/weight, 38-40 hot is about where you want the tires (assuming Michelin Pilot Sport 4s).
|
Appreciate
0
|
09-28-2021, 09:15 AM | #6 | |
Captain
1449
Rep 924
Posts |
Quote:
I ran on my MPS4S before my track tires came, and got excellent wear at 34 hot. Would start at 29 cold and get the tires to 160 degrees and see what your pressure does. BTW - The in car pressures and temps are not that accurate, especially the temps, they read about 25 degrees cooler than actual, since they are measuring air temp inside the tire, and not the tire temp itself. I know this because I run the cup2 connects which has the sensor actually against the physical tire and it reads hotter.
__________________
2023 F90 M5
Retired - 2021 G82, 2019 440xi, 2020 X7, 2019 X5, 2013 F10, 2010 F10 |
|
Appreciate
1
nizona30.00 |
09-28-2021, 02:38 PM | #7 | |
Lieutenant Colonel
2519
Rep 1,773
Posts |
Quote:
|
|
Appreciate
0
|
09-28-2021, 02:43 PM | #8 | ||
Captain
1449
Rep 924
Posts |
Quote:
39 is insane and perhaps on a much lighter car Call jackson motorsport, thats who michelin directed me to for temps and pressures, they will ask your car, tire size, and track, and surface type and give you recommendations Edit: Rennlist GT3 forums poll - https://rennlist.com/forums/991-gt3-...ith-mpsc2.html
__________________
2023 F90 M5
Retired - 2021 G82, 2019 440xi, 2020 X7, 2019 X5, 2013 F10, 2010 F10 Last edited by beachBmmr; 09-28-2021 at 03:49 PM.. |
||
Appreciate
0
|
09-28-2021, 03:50 PM | #9 | |
Lieutenant Colonel
2519
Rep 1,773
Posts |
Quote:
https://www.pca.org/sites/default/fi...r-TTW-2018.pdf Page 23 there for Michelin's own recommendations. Last edited by BMWRacer523; 09-28-2021 at 03:57 PM.. |
|
Appreciate
0
|
09-28-2021, 04:06 PM | #10 | ||
Captain
1449
Rep 924
Posts |
Quote:
__________________
2023 F90 M5
Retired - 2021 G82, 2019 440xi, 2020 X7, 2019 X5, 2013 F10, 2010 F10 |
||
Appreciate
0
|
Post Reply |
Bookmarks |
|
|