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HOW TO'S   WHAT IF'S
What you need to know for your VW Torsion Bars

Sway-A-Way has greatly expanded the Tech Room. Customers can find updated technical and application information here on our complete line of Sway-A-Way Suspension Components and accessories.

ON LINE CALCULATORS are available to calculate spring rates, wheel rates, dual spring rates, torsion bar rates and more for a variety of different suspension designs. The nature of suspension products lends them to many varied applications of one part number. Proper selection, use, installation, and maintenance may require prior suspension knowledge and familiarity with your particular performance requirements. Feel free to utilize the tools in this Tech Room and/or our experienced staff to assure the best selection and use of Sway-A-Way products.

AXLE LENGTH MEASUREMENT INSTRUCTIONS - VW and PORSCHE


VW GUIDES

VW Torsion Bar Application Guide

Buggy Type 1000 Series21 3/4" 1100 Series 24 11/16" 1200 Series 26 9/16"
Single Seat Buggy 23-25mm 24-26mm 24-27mm
Two Seat Buggy 24-27mm 24-27mm 25-28mm
Baja Bug 25-27mm 26-28mm 26-29mm
Street Bug 24-26mm 25-27mm 26-28mm
SHOCK REBUILD / REVALVE
SUSPENSION WORKSHEET
CALCULATORS
INSTALL INSTRUCTIONS
DIAGRAMS
VW GUIDES
  AXLE LENGTH MEASUREMENT INSTRUCTIONS
  VW TORSION BAR APPLICATION GUIDE
  VW MAXIMUM ANGLE
OF TWIST
  PORSCHE PRELOAD ANGLES
  VW PRELOAD ANGLES
  VW TORSION BAR RATES

VW Maximum Angle of Twist (Standard Bars)

Bar Diameter 1000 Series21 3/4" 1100 Series 24 11/16" 1200 Series 26 9/16"
23mm 31.0 degrees 36.7 degrees 39.3 degrees
24mm 29.7 degrees 35.2 degrees 37.6 degrees
25mm 28.5 degrees 33.7 degrees 36.1 degrees
26mm. 27.5 degrees 32.5 degrees 34.8 degrees
27mm 26.4 degrees 31.3 degrees 33.5 degrees
28mm 25.5 degrees 30.1 degrees 32.2 degrees
29mm 24.6 degrees 29.1 degrees 31.1 degrees
30mm 23.8 degrees 28.1 degrees 30.1 degrees

 

VW Maximum Angle of Twist (Race Bars)

Bar Diameter 1000 Series 21 3/4" 1100 Series 24 11/16" 1200 Series 26 9/16"
23mm 41.4 degrees 47.7 degrees 51.7 degrees
24mm 39.6 degrees 45.6 degrees 49.5 degrees
25mm 38.0 degrees 43.8 degrees 47.5 degrees
26mm. 36.5 degrees 42.1 degrees 45.7 degrees
27mm 35.2 degrees 40.6 degrees 44.0 degrees
28mm 34.0 degrees 39.2 degrees 42.5 degrees
29mm 32.8 degrees 37.8 degrees 41.0 degrees
30mm 31.7 degrees 36.5 degrees 39.6 degrees

 

Porsche 911, 912, 924 & 944 Torsion Bar Preload Angles

Instructions: Before taking apart the suspension, level the car and measure and record the spring plate angle for later reference. The spring plate angle is measured with no pre load on the torsion bar. Find the new bar diameter and pre load angle in the chart. Use the pre load angle from the table for setting the new bars to get stock ride height.

Application Stock Preload Angle
Porsche 911, up to 1968, 23mm diameter 36
911, 1968 & up, 22 mm diameter 39
912, Pre 1968, 23 mm diameter 33
912, 1968 and up, 22 mm diameter 36

NOTES: These values are approximate. The angle reference is the top edge of the spring plate from horizontal down with no pre load on the torsion bar. All angles are calculated to maintain stock ride height. The ride height changes by 1” for each 3 ½ degreed of pre load, EXAMPLE: If you want to lower the car by 1”, reduce the table pre load by 3.5 degrees.

Diameter 911, Pre 68
24 11/16”
911, 68 & up
24 11/16”
912, Pre 68
24 11/16”
912, 68 & up
24.6875
22 mm  43.12 38.97 39.47 36.08
23 mm 36.09 32.62 33.04 30.21
24 mm 30.44 27.52 27.87 25.48
25 mm 25.86 23.37 23.67 21.64
26 mm 22.1 19.98 20.23 18.5
27 mm 19 17.18 17.4 15.91
28 mm 16.43 14.85 15.04 13.75
29 mm 14.28 12.91 13.07 11.95
30 mm 12.47 11.27 11.41 10.44
31 mm 10.94 9.88 10.01 9.15

Approximate Wheel Rates

Diameter 911 & 912
LB/IN
924 & 944
LB/IN
22 mm 106.44 98.03
23 mm 127.15 117.11
24 mm 150.74 138.84
25 mm 177.48 163.47
26 mm 207.63 191.24
27 mm 241.46 222.4
28 mm 279.27 257.22
29 mm 321.36 295.98
30 mm 368.03 338.97
31 mm 419.61 386.47
 
Suggested VW Preload Angles for Sway-A-Way Torsion Bars

Instructions: Before taking apart the suspension, level the car and measure and record the spring plate angle for later reference. The spring plate angle is measured with no pre load on the torsion bar. Find the new bar diameter and pre load angle in the chart. Use the pre load angle from the table for setting the new bars to get stock ride height.

Application Stock Preload Angle
Bug, up to 1960, 24 11/16” long bar, 24 mm diameter               13
Bug, 1961-1968, 21 ¾” long bar, 22 mm diameter 16 1/2
Bug, 1969 & up, 26 9/16” long bar, 22 mm diameter 20 1/2
Type 3, all, 26 9/16” long, 23.5 mm diameter 23 1/2

NOTES: These values are approximate. The angle reference is the top edge of the spring plate from horizontal down with no pre load on the torsion bar. All angles are calculated to maintain stock ride height. The ride height changes by 1” for each 3 1/2 degrees of pre load.
EXAMPLE: If you want to lower the car by 1”, reduce the table pre load by 3.5 degrees.

Diameter 21 ¾” 24 11/16” 26 9/16”
22 mm 16.52 19.07 20.71
23 mm 13.83 15.96 17.33
24 mm 11.67 13.46 14.62
25 mm 9.91 11.44 12.42
26 mm 8.47 9.78 10.61
27 mm 7.28 8.41 9.13
28 mm 6.3 7.27 7.89
29 mm 5.47 6.32 6.86
30 mm 4.78 5.52 5.99

Approximate Wheel Rates

Diameter 21.75 LB/IN 24.68 LB/IN 26.56 LB/IN
22 122.85 106.44 98.03
23 146.75 127.15 117.11
24 173.99 150.74 138.84
25 204.85 177.48 163.47
26 239.65 207.63 191.24
27 278.7 241.46 222.4
28 322.34 279.27 257.22
29 370.91 321.36 295.98
30 424.78 368.03 338.97
31 484.31 419.61 386.47
 

VW Torsion Bar Rates (in LB/ *of Twist)

Bar Diameter 1000 Series21 3/4" 1100 Series 24 11/16" 1200 Series 26 9/16"
20mm 401 339 317
21mm 488 413 385
22mm 598 497 464
23mm. 702 593 554
24mm 832 703 657
25mm 979 828 773
26mm 1145 968 904
27mm 1333 1126 1052
28mm 1651 1303 1217
29mm 1774 1499 1400
30mm 2031 1716 1603
 
 
 
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