More on Spring Rates real quick. 8K is the shortening metric measurement of the spring rate in this example 8 kg/mm (Pretty Common). What this means is that if you apply 8 kilograms of weight to the top of the spring it will compress 1mm. If you apply another 8 kilograms (16kg total) of weight it will compress another 1mm. The other spring is being measured in pounds per inch; in this case 500 lbs / inch. If you apply 500 lbs of weight to the top of the spring it will compress 1 inch. Now if you apply another 500 lbs of weight it will compress another 1 inch so (1000 lbs will = 2″ of compression). The Formula to calculate Spring rate Kilograms to Lbs, Kilograms x 56 = Spring rate in lbs/in, so 8k x 56lbs = 448lbs And do the opposite to go from Lbs to Kilograms, Lbs Spring Rate / 56 = Spring rate in KG/mm so 500lbs/56lbs = 8.9k

Thanks for the info. Enjoy your videos.

Very good video. excellent explanation of how coilovers work. I just changed out the Tein coilovers, which I never really liked, on my Z to Powetrix R/T's with Swift 7/5 springs. The Teins were quite harsh even at the softest setting. The Powertrix are perfect for the street. Haven't been on the track with them yet.

dude, thanks *soo* much for just giving out super valuable info like this. i cant find anything this helpful and straightforward anywhere on the internet

Are you saying 8 Kg equals 500 lbs and 6 Kg equals 336 lbs?