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Old 12-15-2012, 09:53 AM   #1
2000blackzx3
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Join Date: Jun 2004
Fan#: 9744
Location: QC, Canada, United States
What I Drive: 2002 SVT Focus

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Custom rear spring perches

I'm looking for ideas as far as getting some spring options in the rear. I have FK coilovers 400F/350R right now, and I'm considering using SWIFT coilover springs (at least for the front) with revalved Konis, but I may try to fab some rear perches that would allow me to fit standard diameter coilover springs on the rear control arms.

What have you guys done to get 400+ spring rates at the rear? What are the options without a custom bottom spring seat? Any spring seat I can source somewhere without making one? (My FKs are installed with the adjustable perch at the top, and the spring fits in the original control arm location at the bottom). I thought about bolting a machined spring perch through the arm, sandwiched with a plate (big washer) underneat.

What spring rates would you suggest for mostly autocross, and maybe some road racing? I'm thinking about 500F/500R as a starting point. I have 21mm F and 24mm R sway bars, and will run in FSP next year on C71 Z214 in 225/45/15 if budget allows. A Torsen LSD will be installed. The car was close to neutral this year, but could use a little more stiffness at the rear.

Here's a reference pic (not my car) :


Show us your setups!


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Canadian ASN FIA National Autoslalom Champion, 2012
Other championships won :
2013 Overall & SP, CADL / 2013 SP, Quebec Championship / 2012 ST & Overall, CADL / 2012 ST, Club Delta Quebec / 2011 Rookie of the Year, CADL

Last edited by 2000blackzx3; 12-15-2012 at 01:11 PM.
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