PS-75DBDRAG-STRUT Strut, Pro-Drag, Dual-Bleed TECHNICAL MANUAL Main Office 150 Franklin St. • P.O.
PS-75DBDRAG-STRUT · Pro Drag Strut 2010/2011 Table of Contents: Introduction Terminology Getting Started Adjusters Rebound Adjuster Compression Adjuster Factory Settings Warnings Track Tuning Troubleshooting Technical Support p.3 p.4 p.5 p.5-6 p.6 p.7 p.8 p.9 p.10 p.10 p.
PS-75DBDRAG-STRUT · Pro Drag Strut 2010/2011 Introduction Thank you for your purchase of your new Penske Racing Shocks Pro Drag Strut! The Pro Drag Strut is the result of many years of development in drag racing combined with 20+ years of shock absorber technology used with success in the highest levels of Motorsport. The Pro Drag Strut is intended for use (and is approved for competition) in NHRA Pro Stock, NHRA Pro Mod, ADRL, IHRA Pro Stock, and IHRA Pro Mod classes.
PS-75DBDRAG-STRUT · Pro Drag Strut 2010/2011 Terminology: COMPRESSION ADJUSTER REBOUND ADJUSTER JAM NUT (NYLON) SHAFT BUMP RUBBER SHAFT BEARING CAP BODY RIDE HEIGHT ADJUSTER THRUST WASHER/BEARING LOWER SPINDLE HOUSING INFLATION VALVE 4
PS-75DBDRAG-STRUT · Pro Drag Strut 2010/2011 Getting Started: The Pro Drag Struts are set from the factory at recommended starting settings for your application. They are pressurized and ready to go. The starting pressure for the Pro Drag Strut is 75 psi. Adjusters: The dual-bleed adjusters are nested within the same mechanism. This means that when making a compression adjustment, the rebound adjuster will NOT turn. When making a rebound adjustment, the compression knob will rotate. This is normal.
PS-75DBDRAG-STRUT · Pro Drag Strut 2010/2011 To adjust, follow the procedure as follows (if this procedure is not followed in the recommended sequence, the intended settings may not be achieved in practice): To Set Adjusters: 1.) Turn REBOUND Hex full clockwise until it stops. 2.) Turn COMPRESSION Allen full clockwise until it stops. 3.) Turn the COMPRESSION Allen counterclockwise to desired setting. 4.) Turn the REBOUND Hex counterclockwise to desired setting. 5.
PS-75DBDRAG-STRUT · Pro Drag Strut 2010/2011 Adjustment Range: COMPRESSION (20 Clicks) The adjustment range of the compression adjuster works primarily in the low-speed area of the velocity spectrum. This is from 0-2 in/sec in strut velocity. Testing has shown that this is the area where transients to the chassis can be tuned depending on driver preference and down-track aero performance. Force (lbs) CD-20 CLICKS.CVP CD-0 CLICKS.CVP CD-1 CLICK.CVP CD-2 CLICKS.CVP CD-4 CLICKS.CVP CD-6 CLICKS.
PS-75DBDRAG-STRUT · Pro Drag Strut 2010/2011 Factory Settings: Adjusters: -20 (Compression) -10 (Rebound) depending on application Gas Pressure: 75 psi -20 LF -13 RD.CVP 128.3 0 -200 Factory Dyno Curve Force (lbs) -400 -600 -800 -10 -1,000 -1,200 -1,272.7 0.00 0.5 1.0 1.5 2.0 2.5 Velocity (in/sec) 8 3.0 3.5 4.0 4.5 4.
PS-75DBDRAG-STRUT · Pro Drag Strut 2010/2011 Warnings: Do not remove the bump rubber from strut in use. The travel requirements of the Pro Drag Strut were achieved from multiple years of testing and observance of strut travels. The limiting devices installed on the strut allow sufficient travel and protect seals from the tightening flats on the shaft. Failure to comply may lead to improper function of the strut seals and strut unit.
PS-75DBDRAG-STRUT · Pro Drag Strut 2010/2011 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.
PS-75DBDRAG-STRUT · Pro Drag Strut 2010/2011 Technical Support: 8:30 AM – 5:00 PM (EST) Penske Racing Shocks – Technical Center 150 Franklin Street Reading, PA 19602 United States 610.375.6180 Penske Racing Shocks Midwest 12666 U.S. Route 12 Brooklyn, MI 49230 United States 517.592.6681 www.penskeshocks.com Rev.
