Originally posted by salaki
Is '04 GF210 really Progressive Springs?
I am still confused.
Heres the low-down on springs, coilovers, struts, etc.
The Gf210 cil spring is geared more wowards performance and track use due to its more linear rates and higher spring rate, but is completely suitable for daily driving.
Regarding progressive and linear rates, there is a lo of misinformation on the internet as to what is better, why and what to look for. Many people tend to ask "Are they progressive or linear?" For a standard coil spring that mount to OEM style shocks and struts, they cannot be one or the other.
Standard automotive coil springs (with the exception of fixed diameter springs for adjustable coilover suspension) are both linear and progressive. For drivability and ride cumfort, a portion of the spring uses a progressive rate, while the majority is linear. One thing that sets different manufacturer's springs apart is the precentage of progressive 'coils' on the spring versus the linear 'coils'
Typically the progressive coils are wound tighter together and are located on the top and bottom of the spring. The center portion has evenly spaced coils, which is the linear rate.
What dictates how many progressive coils a spring should have? This can only be determined through R&D, and is dependent on many factors, including upper and lower OEM spring perch, weight of the vehicle and several others.
The progressive coils located on the top and bottom of the spring help with daily driveability and work to absorb some of the shock from irregular road conditions.
A common misconception is that the struts dictate driving performance. Struts, also called dampeners, work in conjunction with the spring to ensure that the bound and rebound of the suspension is not too quick , or too slow. The majority of suspension travel and handling is performed by the coil spring. If a shock (or adjustable coilover in many cases) is valved too stiffly, it is not allowing the spring to perform it's function. The huge misconception with many people who are looking for adjustbale coilovers and look strickly at the dampening stiffness as a gauge of 'performance.' A stiff damper does not compress nor rebound quickly, which means the contact patch of the tire with the ground is not optimal or 0% on bumpy or rough surfaces. A proper spring/strut combo or adjustble coilover suspension will have a spring rate and internal valving that is mated to complement each other.
"Stiffer is not always better"
Tires are the only thing connection your car to the road, if the contact patch is not optimal or non existant, then handling performance is degraded.