rFactor 2: unstable over kerbs — what to change
What it feels like
Touch a kerb and the car jumps, gets unsettled, and you end up avoiding kerbs to keep it.
Why it happens and what we're after
Unstable over kerbs: soften the bars, raise ride height and lower the dampers' bump so the car absorbs the kerb hit instead of jumping.
What to change, exactly
Ranges, steps and defaults are the REAL ones for this sim. The amount is expressed in the game's own unit so you can apply it without converting anything.
Parameters flagged as “estimated range” do not come from a verified in-game capture: the direction of the change is right, the exact magnitude may differ on your car.
1.Front anti-roll bar
Lower ↓ by 11 slider stepestimated rangeRange: 1 – 8 · Default: 4
Front axle roll resistance (position scale). rF2 models it as a physical bar diameter converted internally to stiffness via a non-linear formula (not a direct N·m/° value) — shown here as a position scale, same approach as the rest of the catalogue. Stiffer = less relative front grip. (concept confirmed, scale estimated)
What changes when you move it this way
Softer front = more front grip and rotation; fixes understeer.
2.Rear anti-roll bar
Lower ↓ by 11 slider stepestimated rangeRange: 1 – 8 · Default: 3
Rear axle roll resistance (position scale). Same criterion as the front. Stiffer = sharper rear and less rear grip. (concept confirmed, scale estimated)
What changes when you move it this way
Softer rear = more traction and rear stability; fixes oversteer.
3.Front ride height
Raise ↑ by 2 mm2 slider stepsestimated rangeRange: 25 – 90 mm · Default: 45 mm
Front axle reference height. NOTE: in rFactor 2 this value is the physics model's INNER SUSPENSION PIVOT reference point, not the real floor-to-ground distance (motorlaps.com). It still works to compare 'higher/lower' between setups, but don't read it as the exact physical floor height. Lower = more aero load. (concept confirmed with caveat, range estimated)
What changes when you move it this way
Raising gives more travel for kerbs/bumps and less bottoming, costing some aero grip.
4.Rear ride height
Raise ↑ by 2 mm2 slider stepsestimated rangeRange: 30 – 100 mm · Default: 55 mm
Same caveat as the front: it's the suspension inner-pivot reference point, not real ground clearance. With the front it sets the rake that loads the diffuser. (concept confirmed with caveat, range estimated)
What changes when you move it this way
Raising the rear adds rake: more aero load and rotation, until it gets unstable if overdone.
5.Front slow bump
Lower ↓ by 300 N/(m/s)3 slider stepsestimated rangeRange: 500 – 8000 N/(m/s) · Default: 2500 N/(m/s)
Front damper resistance to slow COMPRESSION, in newtons per metre/second of shaft speed (weight transfer under braking/turning). This batch models only the slow channel (no fast/kerb channel). (unit confirmed, value estimated)
What changes when you move it this way
Lower = the front dives more freely (more mechanical grip), with more pitch.
6.Rear slow bump
Lower ↓ by 300 N/(m/s)3 slider stepsestimated rangeRange: 500 – 8000 N/(m/s) · Default: 2200 N/(m/s)
Rear damper resistance to slow compression. Affects how the rear squats on power. (unit confirmed, value estimated)
What changes when you move it this way
Lower = the rear squats more freely (more exit traction), with more movement.
How to apply it without losing your afternoon
- 01Change ONE thing at a time and run three clean laps before judging. Two changes at once and you no longer know which one worked.
- 02Start with the first parameter on the list: they are in the order the engine applies them, from the one with most authority to the fine tuning.
- 03If the change goes the right way but falls short, repeat the same step again before touching another parameter.
- 04If it gets worse, put it back. A setup you don't understand is slower than a baseline you do.
Where this sim stores its setups
rFactor 2 stores setups as .svm files in [Steam]\steamapps\common\rFactor 2\UserData\<your_name>\Settings\<track>\ (one folder per circuit). To import a community setup you drop the .svm into the matching track folder and load it from the garage screen. Le Mans Ultimate (same developer) inherits this exact file system. (folder structure by analogy with LMU; not verified against a real rFactor 2 install in this session)
Want the exact values, not just the direction?
The generator takes your car, your track, the weather, grip and fuel, and returns the full setup with the reasoning behind every number. Free to start.
Car classes covered in this sim: GT3
Free to start: you only need an account, no card.
If that wasn't it
Symptoms get confused with each other: what feels like poor traction is very often oversteer on throttle. These are the other diagnoses for this sim.
- Understeer on corner entryYou turn in and the car keeps going straight: it washes wide before the apex.
- Mid-corner understeerMid-corner, at steady speed, the car refuses to hold the line and you have to unwind the wheel.
- Understeer on corner exitAs you get on the throttle the car pushes wide and runs out of road on exit.
- Oversteer on corner entryAs you release the brake and turn in, the rear steps out and the car rotates too much before the apex.
- Mid-corner oversteerMid-corner the rear keeps sliding on its own and you are correcting with the wheel the whole way through.
- Snap oversteer on throttleYou get on the power on exit and the rear snaps sideways: spin, or a big correction.
- Unstable under brakingBraking hard in a straight line the car moves around, the rear tries to come round or you lock up.
- No traction on corner exitOn exit the driven wheels spin and the car won't hook up: you lose time down the next straight.
- Tyres overheatingGrip falls off after two or three laps and temperature or pressure climbs past the window.
- Tyres not coming up to temperatureThe first laps the car slides everywhere and the tyres take forever to switch on.
- Car bottoming outOver fast sections or compressions the floor hits the track, the car bounces and you lose grip exactly there.
The same problem in other sims
Same symptom, different parameters: each game exposes different sliders, with other units and other ranges.