What is unique about Ironman leaf and coil springs?

The thing that makes Ironman leaf and coil springs unique is that they are designed to match driving style and vehicle use. Generally most 4×4 owners are totally obsessed by how much lift they can achieve for a vehicle.

Ironman 4×4 Suspension however concentrates on improving ride, handling, comfort and control while also providing lift. These design concerns are made without compromising safety and will make driving your vehicle a pleasure.

Ironman leaf and coil springs allow 4×4 owners to choose the right design of springs that suits their driving style. So whether you drive on road, off road or with a constant load you can find the Ironman spring that suits you. In some models we offer four different spring designs to cover all driving styles.

How much lift can I expect from Ironman 4x4 springs?

Ironman leaf springs lift vehicles around 50mm above new vehicle ride height.

Ironman coil springs lift vehicles around 40-50mm from new vehicle ride height.

Vehicles with Independent Suspension are limited to 25-50mm lift (vehicle dependant) due to the geometry restraints inherent by this design of suspension.

Will my vehicle feel firmer after fitting Ironman 4x4 springs?

Yes it can. However, nobody wants a rigid and stiff suspension. Ironman springs will firm the ride and support the load, but when used in conjunction with Ironman Shock Absorbers, the ride will also become noticeably smoother. With this combination you benefit from a strong and responsive handling vehicle, but with the comfort and flexibility you desire.

Can I use Ironman 4x4 Springs with standard length shock absorbers?


The standard length shock absorbers installed with new vehicles are designed to sit in the middle of their travel. Installing Ironman springs will make them to sit higher in their range of travel. This will not affect shock performance and you can enjoy the improved performance of Ironman springs.

* Except Competition Lift Kits.

Can I use Ironman 4x4 Shock Absorbers with standard height springs?


Ironman Shock Absorbers will sit slightly lower in their travel when installed to standard length springs. This will not affect shock performance. Ironman springs and shock absorbers have been "tuned" to work in conjunction, to produce a truly harmonized result.

* Except Competition Lift Kits.

Nitro Gas or Foam Cell. Which is better for me? Which Shock Absorber type do I choose?

4×4 Shock Absorbers used in smooth onroad conditions are judged upon their ability to provide a smooth controlled ride and handling, this means they must accommodate a stiffer valve performance to counter-act body roll and dive etc. An Ironman Shock absorber has been carefully designed to create the correct balance between firmness and comfort.

4×4 Shock Absorbers used in offroad applications generate enormous amounts of heat. Essentially, a shock absorber converts the energy of the spring movement into heat, it is vital to keep the shock absorber as cool as possible for maximum efficiency. Too much heat will cause "Shock Fade" and a poor vehicle ride and handling.

Ironman offers two distinct Shock Absorber concepts to cater for the needs of today’s 4×4 vehicles. 35mm piston, Nitro Gas Shock Absorbers are ideal for the general purpose user, with excellent performance in all terrain, from smooth tarmac surface through to the most demanding corrugations or rocks. Best for the all-rounder who mainly drives onroad, and the occasional adventure weekend and trip away.

41mm piston Foam Cell Shock Absorbers are constructed similar to the Nitro Gas, with the exception being their increase in piston size and the use of the cellular foam sleeve inside. The compact foam cell sleeve replaces the gas charge. The foam sleeve occupies less space inside the shock absorber than the gas charge, allowing more oil inside the shock absorber. The oil is the cooling agent required to expel the heat out of the shock absorber via the outer casing. More oil and the larger outer surface area results in a more efficient radiation of heat. The Foam Cell Shock Absorbers are perfect for use in very demanding and hot offroad environments. Foam Cell shock absorbers also operate very well in smooth onroad applications and will provide a marginally softer and supple ride.

What is the NATA?

NATA stands for National Association of Testing Authorities. It is Australia’s national laboratory accreditation authority which recognizes and promotes facilities competent in specific types of testing, measurements, inspection and calibration.

- Troubleshooting

My vehicle did not lift as high as I was expecting?

Possible causes:

1. modified suspension. The lift an Ironman kit provides is over the suspension of a new vehicle. With old vehicles, the suspension may have been replaced/modified by previous owners. An Ironman 2" inch lift will not further raise a vehicle that already has a 2" lift installed unless this vehicle has sagged.

2. incorrect application. By purchasing a comfort type "a" kit for a workhorse vehicle that carries heavy loads, the springs will sag under the additional weight. It is strongly recommended that before purchasing an Ironman kit, you explain to the distributor what you use your vehicle for so that they can recommend the correct application for your vehicle.

3. incorrect installation can result in an incorrect lift.

What type of steel is used in Ironman leaf and coil springs?

All Ironman springs are made of premium quality (SUP9) silicon manganese spring steel which is the same as supplied to spring makers to most car and truck manufacturers.

Will Ironman springs drop after a short time?

All Ironman leaf and coil springs are shot-peened and triple scragged to limit settling and provide longer life.

It is normal for any new spring to drop around 6mm soon after fitment as the springs "bed in".

What does N/S and D/S mean in the Ironman spring program and why the difference?

N/S stands for near side or passenger side while D/S stands for driver side. Quite often driver side springs are made higher to compensate for the torque of the motor and uneven weight, such as driver, fuel tank, battery, spare wheel etc. In Ironman springs this difference can be as much as 20mm.

If your vehicle exhibits a lean after installation, check to ensure the springs are installed correctly, also consider that if the weight distribution in your vehicle is disrupted by the weight of added accessories, the taller spring should be installed to the heavier side. In some cases trim packers may be required to fine tune the ride height.

*When emailing Ironman 4×4, please include: Name, Location, Vehicle Make & Model

Sales and General Enquiries:  enquiries@terraquip.co.nz
Suspension Technical Enquiries: info@terraquip.co.nz
Accessories Technical Enquiries: enquiries@terraquip.co.nz