Penske Racing Shocks PS-Mustang-Strut User Manual

Main Office

Strut; In

-

line or Remote, Single, Double, or Triple Adjustable

PS-Mustang-Strut

TECHNICAL MANUAL

150 Franklin St. • P.O. Box 1056

Reading, PA 19603

[phone] • [phone] Fax

Table of Contents:

Introduction p.3
Terminology p.4
Getting Started p.5
Adjuster’s p.5
Rebound Adjuster p.6
Compression Adjuster p.7
Disassembly p.9
Piston Selection p.10
Reassembly p.12
Warnings p.15
Parts List p.16
Technical Support p.19

Mustang Strut 2011/2012

2

Mustang Strut 2011/2012

Introduction:

Thank you for your purchase of your new Penske Racing Shocks Mustang package!

The Mustang package can be used in all forms of racing. This manual will explain the details of the strut,
give torque specifications, and give all part #’s.

All of the fundamental attributes found in any Penske Racing Shock have been incorporated into the
Mustang Strut including:

• Standard Penske 45mm bore size which allows use of wide array of piston types

• Low-friction shaft and piston seals

• Hard-chromed 4130 main shaft for strength, durability, and low breakaway friction

• Durable ACME thread body that allows quick adjustment of spring preload (.100” per turn)

• Simple, in-line design

• All Penske user friendly adjusters can be utilized in the strut. Single adjustable, Double

adjustable, our industry leading Dual Bleed Adjuster, Triple, and even Four Way adjustable

configurations can be used.

• Winning heritage – Penske Racing Shocks continue to help our customers win races and

championships in all forms of Motorsport.

• Made in U.S.A. – The Mustang Strut has been 100% designed, machined, assembled, and tested

for quality in the United States.

3

Mustang Strut 2011/2012

BRAKE LINE TAB MOUNT

INNER TUBE

SPING PRELOAD ADJUSTER

SWAY BAR MOUNT BOLT

SWAY BAR MOUNT

OUTER BODY

LOWER MOUNT BOLTS

-

LOWER MOUNT

REBOUND ADJUSTER

COMPRESSION ADJUSTER

LOCK RING

SPING

RETAINER

INFLATION VALVE

Terminology:

AVAILABLE FOR 2.25” OR 2.5” SPRINGS

AVAILABLE FOR 2.25” OR 2.5” SPRINGS

QTY-1 USED TO JAM PRE-LOAD ADJUSTER

QTY-2 USED TO JAM SWAY BAR MOUNT

TL-COMPUNIT IS THE REQUIRED TOOL TO

CHECK AND FILL PRESSURE

TORQUE TO 30 FT/LBS

NOT USED ON DRAG APPLICATION

NOT USED IN ALL APPLICATIONS

TORQUE TO 30FT/LBS

ADJUSTABLE RIDE HEIGHT

4

Mustang Strut 2011/2012

COMPRESSION

REBOUND

Getting Started:

The Mustang 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 Mustang Strut is will range from

75-225 psi, depending on application.

Adjusters:

The most popular and common adjuster are the dual-bleed adjusters, these 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. If the
rebound adjuster turns when you are making a compression adjustment, you may be side loading the
knob or you may have “locked” them together. Check for debris in the threads and or check the
straightness of the screws.

The Dual-Bleed adjuster mechanism provides the following ranges:

• Compression Adjuster (Black Hand Knob): 40 clicks

(stiffer = clockwise; 0 = full hard, -40 = full soft)

• Rebound Adjuster (Red Hand Knob): 40 clicks

(stiffer = clockwise; 0 = full hard, -40 = full soft)

**you will get more clicks than 20, depending on your valving, -20 clicks is typically full soft.**

KNOB

KNOB

Do not over-tighten the adjusters. When making adjustments, they will have a positive stop. In order to

close off the bleed, you do not need to continue to turn the knob for it to seal.

5

Mustang Strut 2011/2012

LF CD+ C-15 R-15.cvp

LF CD+ C-20 R-20.cvp

LF CD+ C1-0 R-10.cvp

LF CD+ C-0 R-0.cvp

LF CD+ C-5 R-5.cvp

-0

-5

-10

-15

-20

-10

-15

-20

-5

-0

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 full clockwise until it stops.

2.) Turn COMPRESSION full clockwise until it stops.

3.) Turn the COMPRESSION counterclockwise to desired setting.

4.) Turn the REBOUND counterclockwise to desired setting.

5.) During track tuning, simply turn adjusters as needed until the adjuster stops which would signify
you are at the end of the adjustment range.

Adjustment Range: REBOUND (40 Clicks)

The rebound adjustment range is extensive but within the typical tuning window for all chassis and track
conditions. The adjuster has most effect in the 0-5 in/sec velocity range of the strut.

297.8

250

200

150

100

50

0

Force (lbs)

-301.7

-50

-100

-150

-200

-250

-300

0.5 1.0 1.5 2.0 2.5 3. 0 3.5 4.0 4.5

0.00 5.04
Velocity (in/sec)

6