4 way adjustable car damper - 8770 series
4 Way Adjustable Car Damper - 8770 Series
From £2550.00 + vat
The 8770 Series 4 Way Adjustable Car Damper is the latest product line introduced by Penske Racing Shocks. The need for a “true 4-way” damper presented itself over the last several racing seasons as teams requested more adjustment from their dampers because of limited testing sessions during race weekends.
Developing a 4-way adjustable car damper was the obvious solution although not new technology to Penske Racing Shocks.
The first 4-way car damper from the Penske Racing Shocks drawing office was designed and competed with in Formula One during the 1990 season with a win in its first race. Since then, the true 4- way design was upgraded and repackaged to be re-introduced in a new configuration in 1996. This design again enjoyed success in the form of 2 World Drivers’ and 1 Constructors’ Championships as well as 33 grand prix wins from 1996 to 2003. All in all, the Penske 4-way design has been a performance advantage on grand prix cars that won over 75 races to from 1990 to the present.
The 8770 car damper is the latest evolution of this true 4-way, which is destined to again enjoy success in motorsport. Other 4-way dampers exist from various manufacturers, but many have 3 compression adjusters and a single rebound adjuster. By offering high and low-speed compression and rebound, the 8770 offers the most versatility with external adjustment which reduces the need for revalves. Having 4 clearly defined adjusters, 2 affecting bleed and 2 affecting high-speed forces, chassis tuning becomes more simplified to the end user. The bleed adjusters target low-speed transient movements (pitch, roll, heave, and warp) of the chassis (sprung mass) within the 4 wheels while the high-speed adjusters tune the transmission of external road inputs into the chassis.
The 8770 is based on proven technology that gives considerable range of adjustment and winning performance in a compact, lightweight package for the serious racing team.
- True 4-way design
- Ø 9/16” shaft for reduced friction and weight
- Piggyback layout for packaging advantages
- Extensive Adjustability
- Low-Friction seal selection
- Easy bleeding with 3 bleed access ports
- Modular design for extensive versatility of radial reservoir and adjuster positions
- Ability to be offered with a Penske dual-bleed shaft if desired
- Ability to be offered with a Penske single-adjustable shaft if desired
- Offered in all body lengths in stock
High-Speed Compression Adjuster(65 clicks of adjustment – 3+ in/sec dyno curve range)
The High-Speed compression(HSC) adjuster consists of a spring loaded poppet valve using quick responding, low inertia titanium coil springs. The use of the titanium material provides a large range of adjustment for any main damper piston choice with a short free length spring, which in turn reduces the adjuster size. Dupont Vespel spring guides help eliminate friction and improve response as well. The poppet valve is Titanium as well with Titanium Nitride coating for good wear resistance and friction properties. The High-Speed Compres-sion adjuster is easily distinguished on the reservoir body by its gold color and bondus wrench access. The adjuster increases damping when turned clockwise.
Low-Speed Compression Adjuster(35 clicks of adjustment – 0 to 2 in/sec dyno curve range)
The Low-Speed Compression(LSC) adjuster consists of a tapered needle/seat arrangement. It is a simple bleed bypass past the high-speed compression adjuster to offer an extensive range of manipulation of the low-speed area or “nose” region of the compression dyno curve. The adjuster maintains its independence from the high-speed adjuster well as minimal “crossover” exists when making adjust-ments. The Low-Speed Compression adjuster is easily distinguished on the reservoir body by its silver color and knurled texture for easy manipulation with the fingers. The adjuster increases damping when when turned clockwise.
High-Speed Rebound Adjuster(15 clicks of adjustment – 3+ in/sec dyno curve range)
The High-Speed Rebound(HSR) adjuster consists of a preload-able cage arrangement that engages the base shim of the rebound stack to prevent the amount at which it opens when fluid flows through the main damper piston. This can be tuned with different shims to achieve any number of curve shapes or any amount of range. The 15 steps of adjustment are very linear and have a positive detent feel. The High-Speed Rebound adjuster is easily distinguished by its gold color (used to designate both “high-speed” adjusters), radial adjust-ment pin holes, and its position on the end of the shaft. It also is distinguished with larger Ø.094 pin holes. Again, rebound damping is increased by turning the adjuster clockwise.
Low-Speed Rebound Adjuster(55 clicks of adjustment – 0-2 in/sec dyno curve range)
The Low-Speed Rebound (LSR) adjuster consists of a needle/seat arrangement similar to the low-speed compression adjuster to allow flow to bypass the main piston. The LSR also manipulates the low-speed “nose” profile of the rebound curve. The Low-Speed Rebound adjuster is distinguished by its silver color and smaller Ø.062 radial holes and is found adjacent to the high-speed rebound knob. Low-speed rebound damping, as with the other adjusters, is increased by turning the adjuster clockwise.
2004 Dallara IRL Specifications
2004 G-Force Specifications
8770 Series - 4 Way Adjustable Car Damper Features
Click to view diagram and features of 8770 Series
To Find Out More or Order:
Tel: +44 01543 434580
Fax: +44 01543 434581