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Discussion Starter #1
What is our motion ratio in front and rear? I'd like to get koni+ground control suspension but I need to know what spring rate to get, and in order to do that I need the motion ratio of our car! anyone knows?[scratch]
 

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You don't necessarily need the motion ratio to determine spring rate. In fact ground control will do it for you or already has for the coilover kit they sell (really stiff in my opinion for anything other than track use....about 425 in/lbs front and rear).

Here's one formula if you need to do it yourself. I have know idea what the Focus ball joint rate is so please don't ask.

http://www.proshocks.com/calcs/imotion.htm
 

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Discussion Starter #3
I'll check directly with Ground Control and see what spring rate they propose for the track.
 
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