DALLARA F305 CONTENTS Manual F305 VR -01 CAR VIEWS CAR INFO SET-UP SUSPENSION Front 7-11 Rear 13-14 DIFFERENTIAL 15-16 DAMPERS RIDE HEIGHT AERODYNAMICS 20-24 COOLING UPRIGHT ASSEMBLY 26-27 SYSTEMS Brakes Fuel Extinguishers GEARBOX SAFETY AND UTILITY NOTES TIGHTENING TORQUES CONVERSION TABLE...
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DALLARA F305 DALLARA AUTOMOBILI IS HAPPY WITH THE CHOICE YOU MADE BUYING THE DALLARA F305, AND WISHES YOU THE VERY BEST IN RACING IT. For any question, advice or idea you might have, please don’t hesitate to contact us. Dallara Automobili Via Provinciale 33 43040 VARANO MELEGARI –...
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 Hankook Yokohama Specification 180/55-13 180/55-13 180/55-13 180/550-13 190/50-13 Free radius (mm) 277.5 277.2 275.0...
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SETUP ADJUSTMENT Effects of the adjustments on the cars’ set-up. Positive change in: means: Height car rises toe-out Camber upper part of rim outward Castor lower part of rim points ahead FRONT REAR PUSHROD ADJUSTER Height change (mm) mono 4.37 twin 4.34 6.09 1TURN...
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[(Ks in Lb/in) / 56 = Ks in kg/mm] T = number of platform (C) turns 2 = mm / turn (for standard Dallara Koni damper top) SETTING PRE-LOAD (for mono and twin configurations) • Mount the damper-spring combination with the platform C just in contact with the spring •...
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FRONT CASTOR ANGLE SETTING When the car is flat (same ride height front and rear), the upright inclination angle (apparent castor) is 1.75° and the castor angle (build in castor) is 10.5°. With different front and rear ride heights: For instance, with 15 mm front and 28mm rear ride height, measured at wheel axis, (wheelbase is 2710 mm) you would measure a ‘apparent’...
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FRONT ANTI-ROLL AND ROLL PRE-LOAD You can use each of the Belleville stacks with or without pre-load. There are two types of pre-load, described in detail here below. The limit of the system is the rocker hitting the magnesium support when moving in lateral sense. Double stiffness pre-load •...
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PRE-LOAD SETTING PROCEDURES DOUBLE STIFFNESS PRE-LOAD • Mount the stack you want to use and turn the platform until in contact with the Belleville stack • Turn the platforms until distance A is the same on both sides • Check distance B to be less than 6.5mm, if more, replace adjustment spacer •...
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FRONT SUSPENSION ROLL CENTRE SETTING Front roll centre height can be changed by moving the spacer to its upper or lower position on the wishbone spherical joint. When choosing "low roll centre" configuration, push-rod length has to be shortened by 1.2 register turns ( 7 faces of the adjuster) to keep the car at the same ride height.. When adjusting the roll centre height camber gain versus wheel travel varies a little.
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@ static ride height with 10mm wheel travel + means longer 20’ 16’ -1.5 turns 24’ *D-1 23’ -0.5 turn *E-2 18’ -1.5 turns 22’ +1.5 turns 18’ Configuration B-2 needs special brackets for the front top mountings (these are available from Dallara).
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REAR ANTIROLL BAR STIFFNESS F305 features a rear anti-roll bar with two adjustable blades, long 80mm. Ø 40mm is the biggest possible RARB, Ø13mm is the softest RARB available. The two digits in this table represent the blade positions: 1=full soft, 5=full stiff.
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POWER FLOW DIFFERENTIAL This differential is designed with versatility as its major asset. Many parameters will lead you to the required setting. A car with good grip and low power may require a completely different arrangement than that required for a high power/low grip car. Working principles: Ten friction plates within the diff, six connected to the side gears, four to the diff casing, control the amount of ‘differential’...
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DIFFERENTIAL LAY-OUT • Check the plate arrangement is equal on both sides. • Side gear ring, diff end plate, diff wall and pre-load spacer all act as “B” plates • A bigger ramp angle transmits less thrust onto the plates than a smaller ramp angle.
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DAMPERS DAMPER DIMENSIONS Standard dampers are new: KONI 2812-925. Front and rear have the same open length and identical installation parts. Damper assembly dimensions are: full open length full closed length FRONT REAR Stroke FRONT REAR On Koni dampers you should always use the 3mm Teflon spacer on front mono assembly to prevent the rocker to lock.
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DAMPER GRAPH The new Koni 2812-925 is a special build damper for the new Dallara F305 car. The range of settings has been increased both passed the former (2812-140) minimum and passed the former maximum damping forces. Koni has also managed to decrease internal friction. The new damper also features a lower gas pressure.
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RIDE HEIGHT CHECK AND REFERENCES • Ride height is fundamental to setting and changing the aero balance of the car. • A lower car generally generates more down-force than a higher car. • A lower car improves performance as it features a lower centre of gravity. •...
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FRONT WING FRONT WING CONFIGURATIONS Note: For medium downforce settings we propose a specific front flap (more narrow than std flap); for high downforce and ultra high downforce you can use the same front flap, the std flap. FRONT WING SIDEPLATE...
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15° 16° 17° 18° 19° 20° 21° 22° 23° 24° 25° These configurations show various settings of the F305 and F304 with equivalent down force level (shown are rear wing angles) F305 F304 LOWER 7° 7° LOWER 9° 17° 14°...
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POLAR DIAGRAM POLAR DIAGRAM DRAG REAR (upper wing) FRONT (flap) LDF = Low Down Force (single small) no flap MDF = Medium Down Force (twin small) MF = Medium Flap HDF = High Down Force (small and mid combined) SF = Standard Flap UHDF = Ultra High Down Force (twin mid) idem •...
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AERODYNAMIC INFORMATION • Front wing main-plane and rear lower wing are set relative to the chassis reference plane. • The optimum setting for the front main-plane is -1° (minus 1°). Any chassis rake angle will alter this setting. • Front flap inclination is intended to be the angle, relative to the chassis reference plane, measured on top of the flap front and inside the Gurney ‘corner’.
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COOLING ADJUSTMENT • Depending on the ambient temperature and the engine manufacturer requested water temperature you may need to adjust the cooling capacity of the radiators. • Cooling efficiency increases by sealing any eventual leakage in the inlet ducts to the radiators.
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HUB ASSEMBLY The following procedure explains how to change front and rear hub bearings • Removal of bearing a) Remove spigot by removing the 6 screws A; b) push off drive flange by using two 6x1 screws set on thread B; c) remove circlip C;...
SYSTEMS ENGINE OIL SYSTEM The distance between the oil cap and the oil surface should be about 115 mm. Less oil may cause cavitation and lead air into the oil circuit. More oil may cause excessive power consumption due to the oil squash. Typically you would need a total of 4.5 litres to fit in the oil tank (including the oil in the engine and hoses).
BRAKE SYSTEM BREMBO BRAKE CALIPER ASSEMBLY Note: the dark piston is the bigger in diameter from both. The car features four different callipers. TRAVEL DIRECTION BRAKE DISC ASSEMBLY...
FUEL SYSTEM F305 features twin electrical-submerged low pressure fuel pumps as a redundant caution in case one pump fails. The driver can switch one or the other low pressure pump from the cockpit. Available at Dallara is a ‘SAFETY’ filling system with a dry-brake valve.
EXTINGUISHER SYSTEM LAYOUT DETAILS The LIFELINE system is an electrically triggered Halon or foam spray fire extinguisher system. The system uses an actuator to operate the valve located on the pressurised container, containing the extinguishing liquid. These are triggered remotely using a battery powered power pack. In order to guarantee reliable operation the actuator follow military specifications.
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GEARBOX & DIFFERENTIAL GEARBOX information The F305 car mounts a Hewland 6 speed sequential gearbox, it is an updated version of the FTR- 200. The crown-wheel and the differential casing are new. Only use the specific tools to ensure proper maintenance. Hewland has written a technical manual, including a spare parts list, for the FTR-200.
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• do not remove from high- and mid-downforce rear top wing assembly the small profile for use as rear low downforce wing because these are not reinforced. Use the specific wing profile, available at Dallara; • when running the car with a rear ride height of 40mm or more, check the height of the rear wing endplate.
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SUSPENSION • ball joint A, used in the front lower and rear lower wishbones, must be fitted with sharp-edge side in contact with circlip B, as shown in following drawing TIGHTENING TORQUES This table lists suggested tightening torques. For additional security use LOCTITE 242 or 243. Tightening torques lbs ft Pinion bearing nut...
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SWG & CONVERSION TABLES Table shows conversion from SWG (Std Wire Gage) to metric units for sheet-metal thickness Metric (mm) 4.064 3.251 2.642 2.032 1.626 1.219 0.914 CONVERSION TABLE Length 1 inch=25.4 mm 1 millimeter=0.03937 in 1 foot=304.8 mm=12 in 1 centimeter=0.3937 in 1 yard=914.4 mm=3 ft 1 meter=39.37 in...
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25000 Km. It holds true if necessary maintenance and checks are provided and if the car had no incidents from the origin. DALLARA is not responsible for incorrect chassis repairs, if made outside its factory or in centres not- recognised by FIA.
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