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Fast Motorsports & Cloud 9 Racing

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Presentation on theme: "Fast Motorsports & Cloud 9 Racing"— Presentation transcript:

1 Fast Motorsports & Cloud 9 Racing
Karting 101 Jeff Cloud Erik Frank

2 Types of karts Sprint kart Sit up Weight ~ 350 lbs
Engines - 2 or 4 stroke 100cc Yamaha, Rotax 80 – 125cc dirt bike Briggs & Stratton HP - 8 ~ 40+ Top speed ~ 100 mph 125cc Shifter Kart

3 Types of karts Enduro kart Laydown Road racing only Engines - 2 stroke
Piston port (KT100 Yamaha, TKM) Reed/Rotary (DAP, Parilla, Komet, PCR) Top speed >100 mph Laydown Enduro Kart

4 Types of karts Super kart Wings Weight ~ 450 lbs Engines - 2 stroke
Rotax 257 Motocross bike (CR 250, YZ 250) 250cc Twin: Rotax 256, Yamaha TZ-250 (G.P. derived) HP (singles) 90+ (twins) Top speed ~ 150 mph Super Laguna Seca

5 Kart Engines 101 Yamaha KT100 100cc Reed Rotax Max FR125 SGM F/E
YZ-125 Rotax 257

6 Racing Formats Sprint Racing Tight, twisty tracks < 1 mile long
Speeds limited to <75 mph Short races (typically laps) Very quick pace Very physical Texas Sprint Tracks: Hill Country Kart Club (New Braunfels) North Texas Karters (Denton) Gulf Coast Karters (Houston) Waco NTK – Denton, TX

7 Racing Formats Road Racing Run on large road racing courses
Longer races (usually 30 minutes) High speeds - over 100 mph for some classes Large fields Regional Road Race Tracks: Texas World Speedway (College Station) Motorsport Ranch (Cresson) Oak Hill Raceway (Henderson) Hallet Motor Racing Circuit (Oklahoma) Typical 125cc Grid Oak Hill – Henderson, TX

8 Kart Racing Organizations

9 Kart vs. race car handling
Karts Very quick steering response Short wheelbase and wide track Direct acting steering linkage (typ. 1/3 turn lock-to-lock) Must be smooth to achieve quick lap times Cars Slower steering response Longer wheelbase vs. track Heavier Smooth is still fast

10 Kart vs. race car handling
Brakes Sprint kart brakes only on rear 125cc Shifter karts and Super karts also have front wheel brakes Approx. ~2G deceleration is possible Front Brake assy (Brembo) Rear brake assy (Brembo)

11 Kart chassis setup Kart setup seems to be contrary to conventional auto practice Stiffen chassis and increase weight transfer for low grip track Soften chassis and decrease weight transfer for high grip track Must lift inside rear tire to go around corner Solid axle wants to go straight King Pin Inclination (KPI) and caster cause inside front wheel to drop and outside front wheel to rise which tilts kart to outside of turn and lifts inside rear wheel (Jacking Effect) Caster and front track width (offset) alter jacking effect

12 Kart Cornering 101 Look!

13 Camber/Caster Orientation
Karts will never have zero caster, typically negative 15 degrees Karts typically run +/-1 degree camber (will go more negative as chassis flexes)

14 Kart Chassis Setup Center of Gravity Driver is largest mass
Location has critical effect on handling Raising driver increases weight transfer Low grip track - higher seat position High grip track - lower seat position Raising ride height also increases weight transfer

15 Kart Chassis Setup Track Width Adjustments Tire Pressure
Increase Rear track: (decreases rear grip) Increase Front track: (increases weight transfer) Up to a point! Tire Pressure Higher pressures  Increases temperatures  Increases grip

16 Safety Helmet Gloves Racing shoes Neck Collar
Safety is Important! Helmet Gloves Racing shoes Neck Collar Suit or heavy jacket and long pants Not fireproof, abrasion resistant Typically made of Cordura/Nylon

17 Data Acquisition Measured parameters Aim Sportsystems EVO 3 Lap time
Sector times RPM Speed Water temp Exhaust gas temp Lateral / longitudinal G Steering position Throttle position Tire Temps Etc… Aim Sportsystems EVO 3

18 Data Acquisition Analysis software versatility: Eliminate guessing
Solid foundation for setup changes Driver training / consistency Lap time comparisons Kart behavior at specific locations on track Engine performance Engine tuning aid Horsepower calculation Alfano Pro D/A Handling evaluation Oversteer/Understeer (driver or kart induced)

19 AIM Sportsystems Race Studio

20 AIM Sportsystems Race Studio

21 Kart Engine Tuning Overview
Intake Cylinder porting Ignition Exhaust source:

22 Kart Engine Tuning - Intake
Mixture setting is critical Carburetor adjustments: Main Jet Needle Fuel system (delivery) Reed cage setup reed material aftermarket options Keihin PWK Carb V-Force Reed Cage

23 Kart Engine Tuning - Porting
Exhaust Port timing is important Higher ports  “More top end” Lower ports  “More torque” Compromise between port area and piston/cylinder life Auxiliary “Boost” Ports Inlet Ports (piston port) Exhaust Ports Transfer Ports

24 Kart Engine Tuning - Ignition
Static Advance Stator setting on crankshaft Dynamic Advance Achieved by CDI box (on shifter engines) Digital Programmable systems available CDI Box Harness Coil Spark Plug Boot Rotor/Stator

25 Kart Engine Tuning Overview
Exhaust – Pipe Selection Determines Operating Powerband Experimental Pipe setup – YZ 125

26 Dyno Testing Optimization of YZ-125 for Roadracing Porting
Cylinder head Piston Intake Ignition Exhaust

27 Dyno Testing ~3 HP gain ~10 HP gain

28 Road Atlanta - Nov. 2002 12 turns – 2.54 miles
Substantial elevation changes 5000 ft. Long “straight” 250cc Super kart lap time: 1:34 (97.2 mph avg!)

29 Wrap-Up Questions? Show and Tell

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