No, a 2" reduction in coil length will not inherently result in a 2" drop in the cars height. That only works out so simply in a mcpherson strut where the spring is straight up and down at the end of the suspension motion. On a Spitfire, the spring is mounted a bit inboard on the arm, and at an angle. You need to take both factors into account to really get an accurate estimate on drop. Off hand, I'd expect a 2" coil reduction to produce more like a 3" car drop on a Spitfire.
Yes, reducing spring rate by the same percentage as vehicle weight reduction is a reasonably accurate starting point. There's a bit more to it, particularly the rebound frequency, but you probably aren't interested in that aspect. As for suppliers, any of the shops specializing in smaller coils can provide them for you. Even places like Jegs will have them. All you need is the diameter, which I can't remember at the moment. _______________________________________________ Support Team.Net http://www.team.net/donate.html [email protected] http://autox.team.net/mailman/listinfo/spitfires http://www.team.net/archive
