The concept of coilovers is frequently discussed among car enthusiasts, whether it's in the heat of a race paddock, on spirited internet forums, or over casual conversations at the pub. But precisely, what is coilover suspension, and how does one determine the right coilover spring rate for their car? This fundamental query is crucial for those looking to enhance their vehicle's handling and performance.
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What is a coilover?
What exactly is a coilover? It’s a specific type of suspension system, often termed as screw type suspension due to the screw threads on the strut that allow for the adjustment of the car’s ride height. This adjustment is achieved through a pair of threaded rings that can raise or lower the vehicle at each corner.
The term ‘coilover’ is actually an abbreviation for ‘Coil spring over shock’, which succinctly describes its configuration. Beyond just ride height, a coilover provides the added benefit of tailored handling performance, each damper can offer the flexibility to fine tune the rebound and compression settings, a feature that appeals to driving enthusiasts and professionals alike who seek custom suspension tuning for their rides.
Spring rates
So how do we measure a spring rate? well before we get into that you may have already noticed there are 2 units of measurement commonly thrown around the internet.
The metric measurement is as follows:
8k is an abbreviated version of a spring rate, it stands for 8kgs/mm. Quite simply this means that if you apply 8kgs of force on top of that spring, it will compress by 1mm. Another 8kgs here will also compress it a further 1mm.
An imperial measurement is a very similar way of working. Also known as pounds per inch.
For example, it could be that a spring rate is 400lbs/inch. Do you want to guess how we work this out? Exactly, it would take 400lbs of force on the top of that spring to compress it 1 inch.
There seems to be a lot of information out there on this subject equally in different units of measurement.
To work this out, you can use the following sums to convert the from metric to imperial and vice versa.
- To convert kgs into lbs inches
Take the KG number and times it by 56.
For example an 8kg spring x 56 would equal a 448 lbs per inch.
- To convert lbs inches into kgs
Take the LBS number and divide it by 56.
For example a 500Lb spring / 56 would equal a 8.92kg per mm
These conversions are essential when comparing coilover spring rates and selecting the proper spring rate for your coilovers, ensuring compatibility with your performance suspension needs.
Why choose coilovers?
Why opt for coilovers over traditional shock absorbers? The coilover suspension system is a popular upgrade for two primary reasons,the desire to lower the vehicle for a sleeker profile and to enhance vehicle handling.
The versatility of coilovers comes from their adjustable nature, offering precise control over compression and rebound settings. This adjustability is crucial for those who demand a suspension system that can transition seamlessly from daily road use to high performance track conditions.
Indeed, it’s the broad range of tuning options that makes coilover kits particularly appealing. Whether it’s for aesthetic appeal or for fine tuning your car’s suspension tuning, coilovers provide a significant advantage in customising your driving experience.
How to choose the right coilover spring?
Linear springs are characterised by their uniformity, they maintain a consistent spring rate throughout their compression, which is visually evident through the even spacing between the coils. This consistency offers a predictable handling experience and steady feedback, which is especially beneficial for precise driving conditions and those looking for suspension tuning for track days.
On the other hand, progressive springs demonstrate variable spacing between the coils, which results in a spring rate that increases progressively with compression. This design allows for a dual character handling, a more compliant ride at lower speeds and a firmer response during aggressive driving maneuvers like cornering at high speeds.
Choosing between these springs depends on your vehicle handling preferences and the demands of your driving style. Whether you’re aiming for stability in high-performance scenarios or a balanced ride for everyday use, it’s important to consider the spring rates conversion and how spring rate is measured to match your coilover set up with your expectations.
For those seeking comprehensive advice on how to choose the right coilover spring, resources such as Maxpeedingrods delve into the intricacies of coilover spring rates and offer expert guidance to optimise your suspension system for an unparalleled driving experience.
Coilover kits
There are various types of coilover kits, this is a very brief way of breaking it down.
- Basic: Features would allow for ride height adjustment on the screw thread.
Ideal for those who want to lower their car for looks and an improvement in handling.
- Performance: In addition to the ride height adjustment, other features would include compression and rebound adjustments.
Ideal for those who want to engage a little more with the vehicle setup. Also giving the driver more options to optimise their handling for on track conditions.
- High Performance: Features would include higher quality components, with even more adjustability options. This may include high and low speed to both compression and rebound adjustors. Other adjustments can include, camber and castor angles.
Ideal for those who are regular on track days or at a club racing level. Extra knowledge is required when using these settings to get the most out of them.
- Adaptive Electronic adjustable: These adaptive dampers often come with high end sports and GT cars. A multitude of sensors around the vehicle are used in conjunction with each other to constantly fine tune the settings during each run. These dynamic settings can be referred to as Comfort, Sport and Race.
Due to the expense this rarely comes as an aftermarket option.
Cars will need to be equipped with such adaptive settings before upgrading each damper.
Conclusion
There’s a good reason why some of the slickest sports cars come equipped with coilovers straight from the factory. If your ride didn’t, installing a coilover kit is a fantastic way to level up your car’s performance suspension. Remember, quality parts like shock absorbers for cars don’t come cheap, but they’re built to last and can transform your driving experience.
Before splashing out, think about whether you really need the upgrade. If your car’s vehicle handling is already solid, a suspension upgrade might not be the most cost effective move. However, if you’re aiming to turn a standard road car into a track ready machine, then coilovers can offer massive benefits, giving you the freedom to adjust spring rates, ride heights, and damping to your heart’s content.
This is where DRS Motorsport comes into play. Elevate your motorsport and track day experience with DRS Motorsport’s top tier Tracking and Four-Wheel Alignment services, conveniently located in Central Scotland
And if you’re serious about racing or becoming a regular at track days, getting your suspension adjustment just right is crucial. With the right setup, you’ll feel the difference every time you get behind the wheel just make sure the benefits match your driving ambitions.
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