dallara F302, Manual

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5 TIRE INFORMATION
Tire dimensions depend on inflating pressure, rim width and camber angle.
These stiffness values are based on the recommended inflating pressure (hot tyres).
FRONT TIRE Avon Bridgestone Kumho Dunlop Yokohama
Specification 180/55-13 180/55-13 180/55-13 190/535-13 180/50-13
Free radius (mm) 277.5 277.2 275.0 268.0 278.0
Vertical stiffness (Kg/mm) 17.0 14.4 18.3 (1.2bar) 15.8 17.0
Hot tire pressure (bar) 1.50 1.50 1.50 1.60 1.60
REAR TIRE
Specification 250/57-13 240/57-13 240/57-13 230/57-13 240/45-13
Free radius (mm) 287.0 286.5 288.0 286.5 288.0
Vertical stiffness (Kg/mm) 17.5 16.7 19.6 (1.2bar) 21.6 17.8
Hot tire pressure (bar) 1.65 1.50 1.45 1.60 1.60
loaded radius depends on tyre make, tyre pressure and camber
SUGGESTED SETUP
These set-ups consider the complete car with the driver seated in it, ready to race.
FRONT Avon Bridgestone Kumho Yokohama
Ride height (mm) 15 16 16 15
Camber (deg) 2°45’ 3°30’ 3°45’ 3°45’
Toe (deg) (total two wheels) 20’ OUT 10’ OUT 20’ OUT 20’ OUT
Springs (lb/in) 800 700 700 800
Vertical Pre-load (mm) 8 6 6 8
Damper static length (mm) 335 335 335 335
Solid spacer (mm) 6 6 6 6
Push rod length (mm)
Roll centre setting STD LOWER STD STD
Roll bar setting <<<>>><<< <<>><<>> <<>><<>> <<>><<>>
Roll pre-load (notches) none none none none
REAR
Ride height (mm) 27 28 28 28
Camber (deg) 1°45’ 2°30’ 3°00 3°15’
Toe (deg) (total two wheels) 10’ IN 20’ IN 20’ IN 20’IN
Springs (lb/in) 900 800 800 800
Pre-load (mm) none none none none
Damper static length (mm) 335 335 335 335
Push rod length (mm)
Roll centre setting STD STD STD STD
Roll bar 21 OD 26 OD 21OD 21OD
Differential setting 60/80#4 60/80#6 60/80#4 60/80#4
A well balanced car will make the driver come closer to the car’s limit.
•
In fast corners aerodynamics (ride heights and wing settings) has more influence on the
balance than in slower corners.
•
In mid-and slow speed corners the weight distribution and the differential settings are most
important.
•
Tune the dampers to the chosen springs, not the springs to the dampers.
• Always pay attention to reach the correct tyre temperatures. No car can reach its limit on
too cold tyres. No car can be reasonably balanced with a significant difference between
front and rear tyre temperatures.
•
Run the car always as low as possible, although without going too stiff on springs for
running lower.