tibbs.james Posted April 21, 2012 Share Posted April 21, 2012 Hello to All I thought I would share my 300zx adjustable Spring setup consisting of the following 2.5" Coil over Springs in OEM spring Location 100mm Steel Threaded Adjusting platforms Spherical Ball Lower mount & spring seat Modified Control arms with oem spring perch cut off I wasn't happy with the typical Ground Control non-captive setup that i have seen elsewhere for the Z31. The other issue I hoped to solve was coil over springs binding due to the Upper and lower spring seat being quite misaligned. The 52mm ID Threaded platform sits snug on the Z31's upper mount. I then cut off the oem spring seat, cut out a piece of 3mm MS flat plate to reinforce the spring mount area and tacked it into position. I then mapped out the Center line of the upper spring seat onto the LCA so that i could see where to position the spherical bearing in the intermediate position so that no spring binding occurred. The spherical bearing mount is from a set of JIC Coil overs and is rated to take the weight of the car - the only change here is that it is mounted on the control arm. My Upper shock mounts have already been section and welded 30mm further into the car so that the shock still has plenty of travel without bottoming out. With a Trolley jack under the control arm pumped up until it lifts the car off the chassis stands The Measurements for Middle of wheel to top of guard: Standard height 300lb king springs = 440mm 180mm 450lb springs with keepers would fully down = 380mm off for tig welding and a NDT report on Saturday Quote Link to comment Share on other sites More sharing options...
PurePontiacKid Posted April 22, 2012 Share Posted April 22, 2012 Just an FYI, the 280ZX has a coilover design stock, this is Z31/S12 specific. Quote Link to comment Share on other sites More sharing options...
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