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Message: <blockquote data-quote="am_izham" data-source="post: 2095256" data-attributes="member: 5892">and couple more arguments. u did mention linear and progressive spring rates. well, not all aftermarket springs have progressive rates. why? and why most of race cars are using linear rates? to answer this u need to understands how springs and shocks work and what are the purpose of both of these parts. i will assume that most of us already knows about this so i'm going simplify my arguments.first, the springs. it's main purposes are 1. to support the weight of the car, 2. to isolate the sprung weight (chassis, engine, occupants, etc.) from the unsprung weight (wheels, tyres, brakes, etc.) to maximise comfort and/or traction.second, the shock absorber. it's job is to suppress the spring's tendency to bounce nonstop. u see, if without shocks even long after ur car hits a bump it will continue to bounce. or simply said, if ur car doesnt have a shock absorber ur car will be bumpy on ur ride from home to office and it will only stop when the car is not moving.that's why it's very important to match the shocks damping ability (valving, piston size, oil viscosity & level, gas pressure on both compression and rebound) with the spring rate. that means, harder springs will need a harder shocks,as are softer springs will need a softer shocks, shorter springs will need a shorter shocks, as are longer springs will need a longer shocks. this is to make sure that the shocks can suppress/absorb the excess energy created by the springs.now we know why race cars, most aftermarket springs, and manufacturers use linear spring rates, because its easier to make a shocks that responds only to one spring rate. and up until now i have yet to find a shock absorber that has a progressive damping.also, that's why most people complains that after they fit a harder/lower spring (cut, compressed, aftermarket, or race) to their car they now have a very bumpy ride. this is because they match it with their stock shock absorber and now the shocks cannot absorb the force of the spring properly thus resulting in a very bumpy/bouncy ride.for more, visit these sites: 1.<a href="http://auto.howstuffworks.com/car-suspension.htm" target="_blank">Howstuffworks "How Car Suspensions Work"</a>2.http://www.geocities.com/gkurka2001/CarTech/tech_index.htm#Suspension3.http://www.carbibles.com/suspension_bible.html</blockquote>

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