{"driver":"Joel Lach","game":"F1 25","records":[{"conditions":{"air_temp_c":21,"track_temp_c":31,"weather":"clear"},"date":"2026-06-21","game":"F1 25","lap_time":"1:06.179","lap_time_ms":66179,"notes":["New Time Trial PB 1:06.179 \u2014 beat 1:06.420 by 0.241s. The tuning paid off.","Tune vs previous record: front wing 39->42 (more front bite), rear ARB 17->14 (slow-corner rotation), brake pressure 90->86 (less front lock). On/off-throttle diff 100/30, brake bias 50.","These targeted the recurring issues the telemetry flagged: front-axle lock-up at T3 and front-end understeer across 3 of 4 corners."],"setup":{"brake_bias":50,"brake_pressure":86,"front_arb":6,"front_camber":-3.5,"front_ride_height":20,"front_toe":0.13,"front_wing":42,"off_throttle_diff":30,"on_throttle_diff":100,"rear_arb":14,"rear_camber":-2.0,"rear_ride_height":46,"rear_toe":0.1,"rear_wing":30,"tyre_pressures":[26.5,26.5,29.5,29.5]},"source_lap":19,"source_session":"session_20260621_111602.jsonl","track":"Austria (Red Bull Ring)"},{"conditions":{"air_temp_c":21,"track_temp_c":31,"weather":"clear"},"date":"2026-06-21","game":"F1 25","lap_time":"1:06.420","lap_time_ms":66420,"notes":["New PB 1:06.420 \u2014 beat previous 1:06.568 by 0.148s. Same proven setup (brake bias 50, pressure 90, rear ARB 17, off-throttle diff 30).","Remaining time is in T3: front-axle lock-up under braking (slip ratio -0.151) \u2014 trail the brake off ~15-20% before the apex instead of holding peak.","T2 hairpin: over-slowing to 66 km/h; brake ~10m later, aim 70-72 km/h apex.","T4: mild fast-corner understeer \u2014 a setup item (front bite), not a driving error.","Five clean laps clustered 1:06.4-1:06.6 \u2014 setup + technique now repeatable."],"setup":{"brake_bias":50,"brake_pressure":90,"front_arb":6,"front_camber":-3.5,"front_ride_height":20,"front_toe":0.13,"front_wing":39,"off_throttle_diff":30,"on_throttle_diff":100,"rear_arb":17,"rear_camber":-2.0,"rear_ride_height":46,"rear_toe":0.1,"rear_wing":30,"tyre_pressures":[26.5,26.5,29.5,29.5]},"source_lap":13,"source_session":"session_20260621_111602.jsonl","track":"Austria (Red Bull Ring)"},{"conditions":{"air_temp_c":24,"track_temp_c":36,"weather":"clear"},"date":"2026-06-20","game":"F1 25","lap_time":"1:06.568","lap_time_ms":66568,"notes":["New PB, beat 1:06.701 by 0.133s \u2014 telemetry-driven setup change.","Brake pressure 95->90 + bias 51->50 killed T3 front lock-up (slip ratio -0.293 -> -0.085), +10 km/h T3 apex speed.","Rear ARB 20->17 + off-throttle diff 20->30 stabilized the T2 hairpin rear-snap.","Gears: T1 4th, hairpin 2nd, T4 3rd; short-shift to 6th into the final complex."],"setup":{"brake_bias":50,"brake_pressure":90,"front_arb":6,"front_camber":-3.5,"front_ride_height":20,"front_toe":0.13,"front_wing":39,"off_throttle_diff":30,"on_throttle_diff":100,"rear_arb":17,"rear_camber":-2.0,"rear_ride_height":46,"rear_toe":0.1,"rear_wing":30,"tyre_pressures":[26.5,26.5,29.5,29.5]},"source_lap":24,"source_session":"session_20260620_150241.jsonl","track":"Austria (Red Bull Ring)"},{"conditions":{"air_temp_c":20,"track_temp_c":29,"weather":"clear"},"date":"2026-07-02","game":"F1 25","lap_time":"1:45.523","lap_time_ms":105523,"notes":["New Spa PB 1:45.523 \u2014 beat 1:45.753 by 0.230s.","Key change: front suspension dropped 40\u219230, softening the front platform. Rear suspension 9.","Setup changes from prev: rear wing 2\u21923 \u2713, front ARB 7\u21924 \u2713, brake bias 55\u219253 \u2713 all held.","Telemetry: C2 front lock-up -0.27 still present (bias 53 slightly forward). All 3 corners show understeer (rear ARB 12 still stiff).","Correction: previous session front suspension was 40, not 30 as initially stated."],"recommended_setup":{"changes_from_record":[{"field":"brake_bias","from":53,"label":"Brake bias","to":51,"why":"Front lock-up at C2 (-0.27) \u2014 bias 53% still too far forward"},{"field":"brake_pressure","from":95,"label":"Brake pressure","to":90,"why":"Reduce peak clamp force to help modulation at big stops"},{"field":"rear_arb","from":12,"label":"Rear ARB","to":9,"why":"All 3 corners show understeer \u2014 rear ARB 12 (max) limiting rotation"},{"field":"front_wing","from":7,"label":"Front wing","to":8,"why":"Add 1 click front downforce if understeer persists after ARB change"}],"full_setup":{"brake_bias":51,"brake_pressure":90,"front_arb":4,"front_camber":-3.5,"front_ride_height":22,"front_suspension":30,"front_toe":0.02,"front_wing":8,"off_throttle_diff":30,"on_throttle_diff":20,"rear_arb":9,"rear_camber":-2.0,"rear_ride_height":40,"rear_suspension":9,"rear_toe":0.13,"rear_wing":3,"tyre_pressures":[26.5,26.5,29.5,29.5]},"label":"Spa v4 \u2014 reduce front lock, sort persistent understeer","rationale":"Brake bias 53% is still locking the front at the main stops. Rear ARB 12 (max) is generating understeer in all 3 detected corners. Front suspension at 30 is working \u2014 keep it."},"setup":{"brake_bias":53,"brake_pressure":95,"front_arb":4,"front_camber":-3.5,"front_ride_height":22,"front_suspension":30,"front_toe":0.02,"front_wing":7,"off_throttle_diff":30,"on_throttle_diff":20,"rear_arb":12,"rear_camber":-2.0,"rear_ride_height":40,"rear_suspension":9,"rear_toe":0.13,"rear_wing":3,"tyre_pressures":[26.5,26.5,29.5,29.5]},"source_lap_file":"20260702_094027_lap12_t10_1m45s523.lap","track":"Belgium (Spa-Francorchamps)"},{"conditions":{"air_temp_c":20,"track_temp_c":29,"weather":"clear"},"date":"2026-07-01","game":"F1 25","lap_time":"1:45.753","lap_time_ms":105753,"notes":["New Spa PB 1:45.753 \u2014 beat 1:46.314 by 0.561s.","Setup: rARB 15\u219212, bias 52\u219255 (overdid it \u2014 see recommended), fARB still high at 7.","Telemetry: C3 front lock -0.62 (worst) + lap-wide understeer in 5/7 corners = fARB 7 too stiff.","Reset at C7 Bus Stop \u2014 rear snap (rSlip 0.70) with rear wing 2. Fix: rear wing 2\u21923.","On-throttle diff 25 (very open) working well for rotation \u2014 keep.","Front/rear suspension not in telemetry struct: running front=30, rear=7.","Suspension correction: front was 40 (not 30 as initially stated); dropped to 30 for next session."],"recommended_setup":{"changes_from_record":[{"field":"rear_wing","from":2,"label":"Rear wing","to":3,"why":"C7 Blanchimont/Bus Stop rear snap (rSlip 0.70) \u2014 1 click rear stability without straight-line cost"},{"field":"front_arb","from":7,"label":"Front ARB","to":4,"why":"Lap-wide understeer in 5/7 corners \u2014 ARB=7 (max) kills front tyre compliance and rotation"},{"field":"brake_bias","from":55,"label":"Brake bias","to":53,"why":"Front lock-up at C1 (-0.29) and C3 (-0.62) \u2014 bias 55% too far forward, rears need to contribute more"},{"field":"rear_suspension","from":7,"label":"Rear suspension","to":9,"why":"Small step up to improve rear compliance vs the stiff rear ARB \u2014 better consistency through chicanes"}],"full_setup":{"brake_bias":53,"brake_pressure":95,"front_arb":4,"front_camber":-3.5,"front_ride_height":22,"front_suspension":30,"front_toe":0.02,"front_wing":7,"off_throttle_diff":30,"on_throttle_diff":25,"rear_arb":12,"rear_camber":-2.0,"rear_ride_height":40,"rear_suspension":9,"rear_toe":0.13,"rear_wing":3,"tyre_pressures":[26.5,26.5,29.5,29.5]},"label":"Spa v3 \u2014 fix front lock-up + understeer, add rear stability","rationale":"Brake bias 55% is over-corrected forward \u2014 causing front lock at both big stops. Front ARB 7 (max) is generating lap-wide understeer. Rear wing 2 leaving the rear nervous through Blanchimont. These three changes target the three remaining issues in the data."},"setup":{"brake_bias":55,"brake_pressure":95,"front_arb":7,"front_camber":-3.5,"front_ride_height":22,"front_suspension":40,"front_toe":0.02,"front_wing":7,"off_throttle_diff":30,"on_throttle_diff":25,"rear_arb":12,"rear_camber":-2.0,"rear_ride_height":40,"rear_suspension":7,"rear_toe":0.13,"rear_wing":2,"tyre_pressures":[26.5,26.5,29.5,29.5]},"source_lap_file":"20260701_222407_lap05_t10_1m45s753.lap","track":"Belgium (Spa-Francorchamps)"},{"conditions":{"air_temp_c":25,"track_temp_c":38,"weather":"clear"},"date":"2026-07-01","game":"F1 25","lap_time":"1:28.649","lap_time_ms":88649,"notes":["New Silverstone PB 1:28.771 \u2192 1:28.649 (-0.122s). ARB + suspension tune confirmed by telemetry.","Tune vs prior record: rARB 15\u219211, fARB 4\u21926, fSusp 41\u219230, rSusp 1\u21927, brake pressure 95\u219290.","Telemetry proof: C7 front lock-up cut from -0.210 \u2192 -0.079 (+0.131, best improvement of the session).","C2 front slip 0.263 \u2192 0.177 (-0.086) \u2014 understeer reduced across the mid-sector.","New issue: C5 (~3835m) rear snap oversteer (rear slip 0.693) \u2014 rear ARB 11 still too stiff for rear wing 2. Next: rARB 8-9 or rear wing 3.","Best clean lap this session: 1:28.838 (lap 4) \u2014 record pace is repeatable without resets."],"setup":{"brake_bias":50,"brake_pressure":90,"front_arb":6,"front_camber":-3.5,"front_ride_height":21,"front_suspension":30,"front_toe":0.01,"front_wing":12,"off_throttle_diff":25,"on_throttle_diff":70,"rear_arb":11,"rear_camber":-2.0,"rear_ride_height":40,"rear_suspension":7,"rear_toe":0.1,"rear_wing":2,"tyre_pressures":[26.5,26.5,29.5,29.5]},"source_lap_file":"20260701_180133_lap09_silverstone_1m28s649.lap","track":"Silverstone"},{"conditions":{"air_temp_c":25,"track_temp_c":38,"weather":"clear"},"date":"2026-07-01","game":"F1 25","lap_time":"1:28.771","lap_time_ms":88771,"notes":["New Silverstone PB 1:28.771 \u2014 beat 1:29.000 by 0.229s. First sub-1:29 clean lap.","Telemetry: C7 front lock-up worst of session (-0.21) \u2014 likely reset trigger. Brake pressure 95\u219290 recommended.","Lap-wide understeer every corner \u2014 rear ARB 15 + front ARB 4 imbalance. Next tune: rear ARB 11-12, front ARB 6-7.","Brake bias at 50% (floor) \u2014 correct, leave it.","Captured via new .lap binary architecture \u2014 first record sealed by the fixed LapBuffer."],"setup":{"brake_bias":51,"brake_pressure":95,"front_arb":4,"front_camber":-3.5,"front_ride_height":21,"front_toe":0.01,"front_wing":12,"off_throttle_diff":25,"on_throttle_diff":70,"rear_arb":15,"rear_camber":-2.0,"rear_ride_height":40,"rear_toe":0.1,"rear_wing":2,"tyre_pressures":[26.5,26.5,29.5,29.5]},"source_lap_file":"20260701_172641_lap02_silverstone_1m28s771.lap","track":"Silverstone"},{"conditions":{"air_temp_c":18,"track_temp_c":28,"weather":"clear"},"date":"2026-07-01","game":"F1 25","lap_time":"1:29.000","lap_time_ms":89000,"notes":["New Silverstone PB 1:29.000 \u2014 beat 1:29.253 by 0.253s using the recommended v2 setup.","Proof the tune worked: C1 front lock-up improved from -0.128 \u2192 -0.079 (+0.049), apex speed up 22 km/h (119 \u2192 141).","Setup changes from leaderboard: rear wing 0\u21922, on-throttle diff 100\u219280, front ARB 8\u21926, brake bias 51\u219250.","Remaining: rear lock-up at C1/C2 still present (bias 50 slightly rear-heavy). Try bias 52-53 next."],"setup":{"brake_bias":50,"brake_pressure":95,"front_arb":6,"front_camber":-3.5,"front_ride_height":21,"front_toe":0.01,"front_wing":12,"off_throttle_diff":25,"on_throttle_diff":80,"rear_arb":15,"rear_camber":-2.0,"rear_ride_height":40,"rear_toe":0.1,"rear_wing":2,"tyre_pressures":[26.5,26.5,29.5,29.5]},"source_lap":19,"source_session":"session_20260624_194610.jsonl","track":"Silverstone"},{"analysis":{"conditions":{"air_temp_c":18,"track_temp_c":28,"weather":"clear"},"corners":[{"apex_kmh":119,"entry_kmh":296,"finding":"Biggest loss. Fronts locking under peak braking \u2014 trail-brake release over 20\u201330m before turn-in instead of snapping off. Front ARB=8 (max) compresses contact patch and worsens locking.","front_lock":-0.128,"gear":3,"handling":"front lock-up + understeer","name":"C1 (~795m \u2014 Copse)","priority":"\ud83d\udd34","rear_lock":-0.087},{"apex_kmh":224,"entry_kmh":327,"finding":"Throttle reapplied 260m after apex (at 2220m vs apex 1960m) \u2014 coasting because the push makes you cautious. With cleaner C1 entry confidence builds; target throttle at ~2150m.","front_lock":-0.071,"gear":5,"handling":"understeer","name":"C2 (~1855m \u2014 Becketts complex)","priority":"\ud83d\udfe0","rear_lock":-0.072},{"apex_kmh":195,"entry_kmh":248,"finding":"Manageable. Mild push, exits cleanly. No immediate action needed \u2014 fix C1/C2 first.","front_lock":-0.032,"gear":6,"handling":"understeer (mild)","name":"C3 (~3470m \u2014 Stowe)","priority":"\ud83d\udfe1","rear_lock":-0.079},{"apex_kmh":123,"entry_kmh":288,"finding":"Rear locking harder than front (-0.099 vs -0.058) \u2014 snap oversteer risk into a critical braking zone. Moving brake bias rearward from 51 to 49 will protect this corner specifically.","front_lock":-0.058,"gear":3,"handling":"understeer + rear locking","name":"C4 (~5430m \u2014 Vale/Club chicane)","priority":"\ud83d\udfe0","rear_lock":-0.099}],"max_speed_kmh":329,"summary":"Every corner shows understeer \u2014 rear_wing=0 is the root cause. Generates no rear downforce so balance is biased forward. Valid trade for top speed on Silverstone's long straights, but it costs you in every braking zone."},"conditions":{"air_temp_c":18,"track_temp_c":28,"weather":"clear"},"date":"2026-06-24","game":"F1 25","lap_time":"1:29.253","lap_time_ms":89253,"notes":["New Silverstone PB 1:29.253 \u2014 beat previous 1:29.629 by 0.376s. Leaderboard-inspired setup with rear wing 0.","Telemetry: C1 front lock-up -0.128 under braking (trail brake more progressively, try bias 49-50).","Persistent understeer all 4 corners \u2014 rear wing 0 + front wing 12 is the root cause. Try rear wing 3-4.","C2: throttle reapply 260m after apex \u2014 commit earlier (~2150m). Front ARB 8 (max) contributing to lock; try ARB 6.","C4 (final chicane): rear locking harder than front (-0.099 vs -0.058) \u2014 risk of snap oversteer. Brake bias 51->49."],"recommended_setup":{"changes_from_record":[{"field":"front_arb","from":8,"to":6,"why":"ARB=8 (max) worsens front lock-up under braking \u2014 dropping to 6 gives the tyre more compliance without losing stiffness for fast corners"},{"field":"brake_bias","from":51,"to":49,"why":"Rear locking at C4 + front locking at C1 both point to bias slightly rearward; 49 balances both axles better"},{"field":"rear_wing","from":0,"to":2,"why":"Adds a small amount of rear stability to fix the lap-wide understeer; costs ~0.05\u20130.1s on straights but recovers it in C1/C2 rotation"},{"field":"on_throttle_diff","from":100,"to":80,"why":"100% fully locked diff causes rear snap on throttle in medium-speed corners \u2014 80% gives cleaner exits without losing traction drive"}],"full_setup":{"brake_bias":49,"brake_pressure":95,"front_arb":6,"front_camber":-3.5,"front_ride_height":21,"front_toe":0.01,"front_wing":12,"off_throttle_diff":25,"on_throttle_diff":80,"rear_arb":15,"rear_camber":-2.0,"rear_ride_height":40,"rear_toe":0.1,"rear_wing":2,"tyre_pressures":[26.5,26.5,29.5,29.5]},"label":"Balanced v2 \u2014 fix the understeer, protect the pace","rationale":"Current setup (rear_wing=0) is a leaderboard trick that works but leaves the car on a knife-edge. These changes tighten the handling window while recovering most of the lap time through better corner entry \u2014 aim is sub-1:29.0."},"setup":{"brake_bias":51,"brake_pressure":95,"front_arb":8,"front_camber":-3.5,"front_ride_height":21,"front_toe":0.01,"front_wing":12,"off_throttle_diff":25,"on_throttle_diff":100,"rear_arb":15,"rear_camber":-2.0,"rear_ride_height":40,"rear_toe":0.1,"rear_wing":0,"tyre_pressures":[26.5,26.5,29.5,29.5]},"source_lap":18,"source_session":"session_20260624_194610.jsonl","track":"Silverstone"},{"conditions":{"air_temp_c":24,"track_temp_c":35,"weather":"clear"},"date":"2026-06-21","game":"F1 25","lap_time":"1:29.629","lap_time_ms":89629,"notes":["New Silverstone PB 1:29.629 \u2014 beat baseline 1:30.714 by 1.085s. The tune delivered.","Tune vs baseline: front ARB 5->8, rear ARB 18->15, brake bias 53->51, brake pressure 100->95.","Telemetry proof: T1 front lock-up cut from -0.221 (baseline) to -0.095 (tuned) \u2014 more than halved.","Next: mild front lock-up remains in sector 1; rear locks slightly at the final chicane. Trail brakes off a touch earlier."],"setup":{"brake_bias":51,"brake_pressure":95,"front_arb":8,"front_camber":-3.5,"front_ride_height":21,"front_toe":0.01,"front_wing":12,"off_throttle_diff":25,"on_throttle_diff":100,"rear_arb":15,"rear_camber":-2.0,"rear_ride_height":40,"rear_toe":0.1,"rear_wing":0,"tyre_pressures":[26.5,26.5,29.5,29.5]},"source_lap":7,"source_session":"_sil_latest.jsonl","track":"Silverstone"},{"conditions":{"air_temp_c":24,"track_temp_c":35,"weather":"clear"},"date":"2026-06-21","game":"F1 25","lap_time":"1:30.714","lap_time_ms":90714,"notes":["Initial Silverstone benchmark on baseline setup \u2014 pre-tune.","Telemetry flagged: T1 front lock-up (slip -0.221) and track-wide understeer across 6 corners (front slip > rear).","Planned tweaks: front ARB 5->7, rear ARB 18->15 (kill the push), brake bias 53->51 + pressure 100->95 (T1/T9 lock-up). Will retest."],"setup":{"brake_bias":53,"brake_pressure":100,"front_arb":5,"front_camber":-3.5,"front_ride_height":21,"front_toe":0.01,"front_wing":12,"off_throttle_diff":25,"on_throttle_diff":100,"rear_arb":18,"rear_camber":-2.0,"rear_ride_height":40,"rear_toe":0.1,"rear_wing":0,"tyre_pressures":[26.5,26.5,29.5,29.5]},"source_lap":8,"source_session":"_silverstone_last.jsonl","track":"Silverstone"}]}