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4-Link Suspension

 
 

Information about 4-Link Suspension.

  1. What is 4-Link
  2. Different Types of Multi-Link Suspension
  3. Building a 4-Link
 
 

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What is 4-Link

4-Link is a type of suspension for the rear axle that is most commonly used in drag racing.

The 4-Link suspension is used to adjust the movement of a rear axle and to avoid lateral and forward-backward movements. However, with a 4-Link, you can achieve all this while still maintaining vertical movement. It is common to switch to a 4-Link suspension with coilovers instead of leaf springs to achieve better suspension performance. Other types of wheel suspensions also switch to a 4-Link due to its adjustability in drag racing.

A 4-Link suspension is adjustable at 4 different points against the rear axle and as many attachments to the chassis. By adjusting the movement pattern, you gain new opportunities for grip that the original wheel suspension did not provide. A 4-Link suspension is difficult to adjust optimally and takes time to learn, but after testing on the track, the advantages are many once you start to find the right setup.
 
 

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Different Types of Multi-Link Suspension

Triangle / Triangulated 4-Link
  • No movement from side to side.
  • You can run with very tight clearance between the fender and tire.
  • Allows for more flexible installation.
  • However, you may encounter issues with interference from the exhaust system.
Parallel 4-Link
  • Can be perceived as easier to install as they can be mounted more flexibly since you can be very close to the frame and the upper link aligns with the lower one.
  • Requires a "Panhard Bar" or Watt Link to avoid lateral movement, which necessitates a slightly larger gap between the tire and fender.
  • Best solution for drag racing.
 
 

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Building a 4-Link

When building a 4-Link on your car, there are universal kits available for purchase, as well as individual parts such as tubes and uniballs if you are building it yourself.
When building a 4-Link, it is important to measure accurately so that the rear axle is in the correct position, ensuring that the height and pinion angle are correct.
 
 

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