Ligier JS F4  ·  JRI Dampers  ·  Pirelli  ·  Putnam Park
F4-21 / HPD K20c1
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Name
Type
Track
Circuit
Ref
🔧 Geometry (Camber fixed by shim — not field adjustable)
FL Camber
FR Camber
−3.4°
−2.7°
RL Camber
RR Camber
−3.3°
−2.8°
ToeFront (per wheel)
mm
ToeRear (per wheel)
mm
CasterFront (ref)
°
📏 Ride Heights & Pushrods
RH Frontmeasured in cm
cm
RH Rearmeasured in cm
cm
Pushrod Front1 flat=1.17mm RH
mm
Pushrod Rear1 flat=1.68mm RH
mm
🌀 Springs — JRI F4 Spec (500 / 550 / 900 lb/in only)
Front
Rear
🎚️ Dampers — JRI F4 Spec (0=soft, 45=stiff · compression only)
LSC FrontCompression only
clk
LSC RearCompression only
clk
⚖️ Anti-Roll Bars
FRONT ARB (1=softest, 5=stiffest)
Left
Right
REAR ARB (A=softest arm, C=stiffest)
Left
Right
🏎️ Aerodynamics
Front wing angle: fixed (no adjustment). Gurney flap only.
Gurney FlapFront wing
Rear WingRow A–F · Col 1–2
🛑 Brakes
Brake Balance% Front
%
⚙️ Transmission
Diff PreloadSadev
Nm
⛽ Tyres — Pirelli
Pressure Front
psi
Pressure Rear
psi
📐 Corner Weights — Scales
Front Left
kg
Front Right
kg
Rear Left
kg
Rear Right
kg
📝 Session Notes
Wheelbase
2748 mm
Min Weight
550 kg
MR Front
1.22
MR Rear
1.53
RC Front
−1.25"
RC Rear
+3.75"
Rake (live)
19 mm
Brake Bal
56% Ft
Live Wheel Rates (spring ÷ MR²)
Front
Rear
Corner Weights
FL
FR
RL
RR
Enter corner weights from scales to see balance analysis
Balance Tendency
◀ UNDERSTEER NEUTRAL OVERSTEER ▶
Neutral
Tyre Stress — Pirelli
FL
Normal
FR
Normal
RL
Normal
RR
Normal
⚙️
Adjust any parameter on the left
to see cascading effects and compensation recommendations
🤖
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