Penske Racing Shocks 75DBDRAG-STRUT - Manual (Page 10)

PS-75DBDRAG-STRUT · Pro Drag Strut 2010/2011
10
Track Tuning:
Compression Adjuster:
Compression adjustments control how much the front of the car will compress as the car travels down
track. This will gain aero performance which will improve MPH. Compression will also help keep the car
more stable or level as the front wheels return to the track after the initial launch. If the compression is
too stiff, the car will go into a “pogo affect” and the rear tires will lose traction and spin.
Rebound Adjuster:
Rebound adjustments control the attitude and weight transfer of the car as it leaves the starting line.
The stiffer or slower the rebound, the more the car will “squat” initially which will induce bite into the
tire. The softer or faster the rebound, the more the car will pick the front end up and travel out off the
starting line before weight can be transferred to the rear tires. This increases wheel speed due to the
lack of initial bite in the tire.
Gas Pressure:
We do not recommend altering the factory gas pressure setting of 75 psi.
Troubleshooting:
Signs of Fluid:
If the area around the shaft bearing and shaft exhibits a small amount of moisture, this is normal. In
order to reduce friction in the system, seal squeezes are slightly relaxed which serves the purpose to
allow a small amount of fluid to be wicked onto the shaft when the strut operates. If you see excessive
amount of fluid that may “pool” on the top of the shaft bearing, you may have a seal problem. Contact
your Penske representative at once.
Loss of Gas Pressure:
If the strut for some reason loses its gas charge, the data may show that the velocity of that corner is
much reduced. Also, a tell-tale sign of reduced or no gas pressure is that the strut (without a spring)
when compressed, will not return to its fully extended position.
Failure of Shaft to Extend:
If the strut has lost pressure or lost excessive fluid, you may find that the strut shaft does not extend
fully when compressed. In some situations, you may need to physically “pull” the shaft out in order for
it to reach full extension.