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Shocks, dampers, and springs

Shocks, dampers, and springs. Joe Filomeno George Lapaan AJ Spagnoletti Matt Tucker. Suspension Rules.

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Shocks, dampers, and springs

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  1. Shocks, dampers, and springs Joe Filomeno George Lapaan AJ Spagnoletti Matt Tucker

  2. Suspension Rules • 1. The car must be equipped with a fully operational suspension system with shock absorbers, front and rear, with usable wheel travel of at least 50.8 mm (2 inches), 25.4 mm (1 inch) jounce and 25.4 mm (1 inch) rebound, with driver seated. The judges reserve the right to disqualify cars which do not represent a serious attempt at an operational suspension system or which demonstrate handling inappropriate for an autocross circuit. • 2. All suspension mounting points must be visible at Technical Inspection, either by direct view or by removing any covers.

  3. Compressed Gas Rules • Working gas must be nonflammable (nitrogen) • The gas cylinder/tank must be of proprietary manufacture, designed and built for the pressure being used, certified by an accredited testing laboratory in the country of its origin, and labeled or stamped appropriately. • The pressure regulator must be mounted directly onto the gas cylinder/tank. • The gas cylinder/tank and lines must be protected from rollover, collision from any direction, or damage resulting from the failure of rotating equipment and cannot be in the cockpit. • The gas cylinder/tank must be securely mounted to the Frame, engine or transmission. • The axis of the gas cylinder/tank must not point at the driver

  4. Theory • Modeled the car with a quarter car model Equations of Motion:

  5. Components • Frame • A-Arms • Rocker • Push Rod • Shock • Spring • Sway Bar Video

  6. Option 1 • Ohlins DB-1 Damper • 200mm free length • 57mm stroke • 4way adjustable with independent high and low speed adjustments for compression and rebound. • Small diameter, twin tube design • Nitrogen gas charge in external reservoir • Adjustable spring preload • Ohlins Spring Kit • Includes 16 springs • 4 x 150lb/in • 4 x 175lb/in • 4 x 200lb/in • 4 x 225lb/in • Other spring rates available but sold separately

  7. Option 2 • FOX DHX RC4 - .99 lbs (without reducers or spring) -Externally adjustable velocity sensitive damping(DSC)-High speed compression-Low speed compression-Bottom-out progressiveness-Rebound-Coil Spring preload -7.875 in eye to eye, 2.25 inch stroke • FOX 300 lb to 600 lb springs (50 lb increments) Other spring rates available but require different sized shocks

  8. Push Rod and Rockers • Push rod and rockers will be required • Will require frame geometry • Will work with frame on this Yanelle Push Bar Rocker

  9. Sway Bar • Will design sway bar • Implementation of sway bar pending on handling of car without one • Once rockers are designed, sway bar will be designed

  10. Cost Ohlins Fox dhxrc4 • $610 per damper • $175 for spring kit • $30 per additional spring • Total = ($610*4)+$175 = $2615 • Running Cost = ($610*4) + ($175/16)*4 = $2483.75 • $585 per spring and damper • Total = $585*4 = $2340 • Running Cost= $2340

  11. Questions?

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