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Sonoma Raceway SpeedSF - May 9-11 2025 - BMW M340i
chrispy
ロケーション:
United States
レベル:
Amateur
chrispy
ラップデイ : 12 May, 2025
1分 52.24秒 (-3.43s)
Sonoma Raceway (Long)
BMW M340i xDrive 2021 (chrispy/AR-1)
ミディアム
タイヤ: 100 AR-1
フロントパッド: CSG C21
リアパッド : CSG C11
タイヤサイズ: 265/35/18
公開日 21 Sep, 2025

Tires: Fri and most of Sat on AR1s, 275/35 CRS on Sun
Weather: Fri was hot, Sat was less hot, Sun was nice

Setup changes/maintenance:
- played around with dampers, ended with +7/+13 front and +7/+12 rear
- changed oil to Motul 5W-40

Crazy weekend with back-to-back-to-back days at Sonoma. Friday wasn't in the original plan, but I wanted to just hang out, help with novice instruction, and get some laps in. After 3 days on AR1s, I had lost a lot of confidence in myself and the tires, so I wanted to rebuild some of that so I can be better when I put the CRS on. Friday was super hot though with track temps over 100F, so that was rough. Saturday was much better, and I even had a chance for a 48 while still on AR1s. To be fair to the tires, they still had plenty of life when I got rid of them. On a lighter car, they would be an excellent lapping tire and wouldn't fall off so quickly in a session. If/when I start tracking a better (aka lighter) car, I might try them again.

As for the CRS, they're def fast. The turn-in isn't as good/immediate as RE71RS, but mid corner grip once the tires are loaded is insane. It'll take some time to get better at them for sure. Their heat tolerance was also impressive. I've never run a tire where my pressures would actually drop 1-2 PSI while not on a cooldown. Now that I'm back on a much grippier tire, the car is back to pushing out of corners. I'm also not getting any entry rotation either, so I'm going to put my rear sway bar back to full middle. I think I'm okay with how my dampers are set, so I'll leave those alone.

Sunday could have been the day to really put down good laps, but I was so tired at that point. Next up will be at Laguna in a couple weeks. Need to recover mentally and physically from all these track days so I can do well on these grippy tires though.

1.49 laps
35:51 could've been a 48 but made a couple big mistakes
1:05:29 maybe a 48 but I left A/C on, nice one idiot

8:26 should have tried drifting down
9:41 car could not turn
17:53 drift fail
19:22 I hate AR1s
21:43 this GT2RS clubsport ruined my session, oh well
25:38 holy smokes look at Gary W
36:02 too much ambition on T1
37:10 backed off too late, messed up my inputs, had to bail on the esses
49:04 I don't know how to drift a downhill corner
53:11 really trying to kill my tires now
56:37 I really missed that meaty feel of grip
57:07 the tires felt so good man
1:05:12 easily the fastest I've ever apexed T10 but it was too fast for my skills
1:06:18 nice mid corner throttle steer to get a good exit
1:11:47 good save I guess
1:12:42 looks like I gave up a 49 because scary C8 with aero and GT3 buddy coming in hot
1:14:03 I noticed my driver side tire pressures were wayyy too high so I called the session early

0:00 Fri session 3
5:55 Fri session 4
11:38 Fri session 5
19:41 Sat session 1
30:28 Sat session 2
38:51 Sat session 3
54:06 Sat session 5 (CRS for a few laps just to get a cycle in)
59:50 Sun session 1
1:07:33 Sun session 2
1:14:47 Sun session 3 (w/ passenger)

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