Sway Bars

Most SL-Cs don't have sway bars, but I purchased the cockpit-adjustable Race Sway Bar upgrade. The driver makes adjustments by moving a lever, one for the front and one for the rear, which rotates a "blade arm" 90 degrees from vertical to horizontal. The firmest setting is when the blade arm is vertical (i.e., on edge) and the softest setting is when the blade is horizontal (i.e., flat). I decided to replace the manual levers with linear actuators. The primary reason for this is that while the levers look cool in a race car, they don't fit with the super-car-like interior I'm trying to achieve. In addition, the levers have only five fixed positions whereas the actuators allow an infinite number of positions. Lastly, since the actuators I'm using have position feedback, I can add presets (e.g., Street, Race, Wet, etc.).

One end of each sway bar has a barrel with TBD bearing(s) held in place with a snap ring. A crank plate is attached to the back of the blade arm which is attached to the cable via a ball joint.

As you can see in the pictures below, clearance from the upper control arms is very tight!

Qty. Part Number Description Unit Price Ext. Price
1   Superlite Cockpit Adjustable Sway Bars $4,999.00 $4,999.00
2 Custom Genesis Technologies 1-3/8" Billet Pillow Block (Extended) $69.95 $139.90 
2 Custom Genesis Technologies 1-3/8" Billet Pillow Block $49.95 $99.90 
4   1/4"-28 Zerk Fittings    
4   ??? Grade 8 Screw    
4   ??? Grade 8 Washer    
4   ??? Socket Head Cap Screw    
    ??? 3/8" Aluminum Cone Spacer    

New Bars

1 PA-06-2-180 Progressive Automations Linear Actuator Stroke 2.5", Force 180 lbs, Speed 0.47"/sec, 12 VDC $269.99

1 MC-206-75MM AiM Linear Travel Potentiometer, 75mm (2.95") Stroke $254.99

Stroke Min Max
Sensor 2.95" 8.58" 11.54"
Actuator 2.50” 10.37” 12.87”
Delta +0.45” -1.79” -1.33”
Mount 2.5” 10.595

Sensor has 0.45” more stroke so we want min length to be half that amount (0.225”) shorter to put position in the middle. Sensor is 1.79” shorter so we want to make bracket span 1.79 - 0.225 = 1.565 shorter. Split that in two to get the offset of .783.

Notes:

  • Sway bar blades are 3/8”-24

  • Linear potentiometer:

Linear Actuator and Control Chain

Qty. Part Number Description Unit Price Ext. Price
1 FA-PO-150-12-4 Firgelli Linear Actuator with Feedback; 4" Stroke; 150 lb Force $139.99 $139.99
1 MB6 Bracket for Linear Actuator $4.00 $4.00
2 GEN-GC1069 Genesis Techonogies Quick disconnect 10-32 Control Cable Ball Joint  $7.15 $14.30
2 GEN-GC1046 Genesis Techonogies Sway Bar Cable Mount $15.29 $30.58 

Drop Links

Drop links are required to connect the lower control arms to the sway bar. The easiest way to get an accurate measurement for length is to mock them with threaded rod and to use female tie rod ends. I fabricated drop links from 5/8" aluminum hex bar. 

[2] PCYMR6T QA1 3/8” High-Misalignment Rod End $9.99

Qty. Part Number Description Unit Price Ext. Price
4 60645K83-RH Right Hand 3/8"-24 Thread Ball Joint Rod End $4.59  $18.36
4 60645K83-LH Left-Hand Thread 3/8"-24 Thread Ball Joint Rod End, $4.59  $18.36
4   Right Hand 3/8"-24 Jam Nut, Grade 5 Steel, Zinc-Plated    
4   Left Hand 3/8"-24 Jam Nut, Grade 5 Steel, Zinc-Plated    
1   4' of 5/8" Wide 6061 Aluminum Hex Bar    
2   3/8"-24 x ??? Grade 8 Screw    
    3/8" Grade 8 Washer    
    3/8" Grade 8 Nyloc    
    ??? Aluminum Cone Spacer    

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