Camber gain, weight transfer, 4-corner loads, balance — understand WHY your car grips.
Static camber ≠ corner camber. As the suspension compresses, camber changes. The RATE of change = camber gain.
When you set -2° camber at static ride height, that's NOT what the tire sees in a corner. As the car rolls, the outside suspension compresses, and the camber gets MORE negative.
Camber gain is how much camber changes PER mm of suspension compression. Measured in °/mm.
High camber gain (0.3-0.5°/mm): Tire gets very negative in corners. Great for lateral grip. Can lose straight-line grip because static camber is mild.
Low camber gain (0.1-0.2°/mm): Camber stays consistent. Less peak corner grip but more predictable and more straight-line grip.
The Kinematics tool in the RC Tuner shows camber gain in real-time. Open it, roll the car, and watch the camber number change. This is your setup truth.
Grip follows load. Weight transfer determines which tires have the most grip at any moment.
Weight transfer is physics: when the car accelerates, brakes, or corners, load shifts between tires. The formula is:
Lateral Weight Transfer = (CG Height × Lateral G) / Track Width
Higher CG = more weight transfer. Wider track = less weight transfer. More lateral force = more transfer.
Why it matters: A tire with more load can generate more FORCE (more grip). But the relationship is not linear — doubling load doesn't double grip. This is why weight transfer management = speed.
Because tire grip curves are non-linear, a balanced load across all 4 tires generates MORE total grip than one heavily-loaded tire and three light ones. Low CG + wide track = better total grip.
At any moment, each corner carries different weight. The LIMITING tire is the one with the MOST load.
In steady-state cornering, load distribution looks like this (typical touring car):
Outside-rear: Highest load (braking + cornering combined) → this is your LIMITING tire
Outside-front: Second highest (cornering, less weight transfer)
Inside-rear: Lightly loaded
Inside-front: Lightest (can almost lift off ground in extreme corners)
Your fastest lap is limited by the tire with the MOST load — because that tire reaches its grip limit first (grip curves are non-linear).
You can't gain corner speed by adding more load to a tire — beyond a certain point, more load = less grip coefficient. The key is balancing load across all 4 tires.
Corner weight scales measure your static weight distribution. Use them to check front/rear balance and left/right symmetry.
The balance between front and rear defines your handling character. Find the sweet spot.
Neutral: Front and rear grip limits reached simultaneously. Ideal but unstable — any perturbation causes spin.
Understeer (push): Front reaches grip limit BEFORE rear. Car won't turn as much as steering input demands. Safer but slower in transitions.
Oversteer (loose): Rear reaches grip limit BEFORE front. Car rotates more than steering demands. Fast but requires skill.
Touring car tuning target: Slight understeer at corner entry (safe, predictable), transitioning to neutral or slight oversteer at corner exit (rotation on throttle).
Every track is different. Learn the track TYPE, then pick your base setup before fine-tuning.
Don't start from scratch every track. Categorize first, then start from a known-good base, then tweak for specifics.
Track categories:
🏎️ High-speed: Long straights, sweeping corners. Priority = stability, low drag.
🔧 Technical: Short straights, many direction changes. Priority = rotation, agility.
🎯 Mixed: Balance of both. Priority = adaptability, neutral base.
🏁 Stop-start (speedway): Tight hairpins, very short straights. Priority = corner exit power delivery.
Higher FDR = shorter gear = COOLER motor (more RPMs per speed, motor works in efficient range). Lower FDR = taller gear = HOTTER motor (less RPMs, more load).
This is counter-intuitive. Remember: "Higher = Hoter" is WRONG. "Higher = Cooler" is correct.