The purpose of a vehicle's suspension is to support the weight of the vehicle and absorb impacts, maximising the tire's contact with the ground while maintaining stability and control.
When using a Land Rover off road the limits of the standard suspension are quickly realised when the lack of wheel travel affects traction and ultimately the vehicle's ability to maintain forward motion.
The added benefits of long travel suspension are exponential. Taller suspension allows larger tyres to be fitted as well as allowing greater suspension movement. Raising the suspension will also increase approach, departure and ramp over angles allowing your Land Rover to overcome larger obstacles.
The majority of Terrafirma Coil Springs are designed to lift the vehicle by approximately 2” (50mm). This is the optimum increase in ride height before the mechanical limitations of the suspension design become an issue requiring further modifications. Safety must be a consideration, raising the centre of gravity too high increases the risk of a roll over.
A vehicle lifted by 2” (50mm) using correctly matched Terrafirma Coil Springs and shocks will also improve on road handling, comfort and stability from the original set up.
To cover the widest range of applications Terrafirma provides a selection of Heavy Load standard ride height springs specifically for Land Rover Defenders and also to cater for the latest trend of fast road styling a range of standard rate lowered coil springs are also available. These combined with any of the standard travel Terrafirma shocks give a ‘squat’ appearance and remarkable road manners with suitable road biased tyres.
Terrafirma’s coil springs are produced by a hi-tech, ISO approved manufacturer using the highest quality steel. The springs are made to a strictly controlled design, manufacturing and testing process to exact tolerances that guarantees consistent sag free performance.
High quality coil spring manufacturing requires stringent key procedures to be followed and every single Terrafirma spring (not batch) has been through the following processes.
The precise heating of the correct length and diameter superior quality steel rods, followed by hot forming on computer-controlled precision mandrels, to ensure consistency.
Quenching in oil controls the cooling process to ensure the correct hardness & strength.
Heat treating eliminates hot spots and brittleness and improves elasticity which could otherwise cause failures in lesser quality springs.
Shot peening with hardened steel shot stress relieves the surface of the steel wire making it more durable and less susceptible to fatigue. An added benefit is a textured surface that acts as the perfect key for the powder coating.
Compressing every spring to the coil bound state to ensure it returns to its specified free length to prevent sagging and height loss (Scragging).
All Terrafirma coil springs are 100% load tested to ensure the spring conforms to the correct height with the specified load for that particular application.
Terrafirma coil springs are powder coated in a durable and protective quality grey finish then packed in sturdy anti rattle branded boxes for distribution and display.