rickd39
Fourth Place
www.duricaracing.com
Posts: 54
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Post by rickd39 on Oct 27, 2017 12:45:39 GMT -6
I am making some new rear shock mounts for my IMCA modified and would like to get some input on the placement of shocks and/or coil-overs on the rear axle.
Specifically how far below the axle centerline do most people mount their shocks and coliovers , infront of the rear and behind the rear, both right and left sides
Thanks
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Post by emptiness777 on Nov 20, 2017 10:35:16 GMT -6
Left rear behind absolutely, and right rear in front. Using the left rear behind you can adjust the indexing to keep the spring pre loaded during hike, which leaves you more available shock travel. Only thing is you’ll want to either run a fast rebound super slow compression shock, or a brake floater or combination of floater and slow speed compression shock to keep that corner up. With the right side I’d put it in front, reason being is you can use the lower link to help assist the indexing in a way that’s congruent with the changes you’re making to the arm angles if you change it. For example you want to free the car up, you can raise the lower RR bar it will add more steer and won’t index the birdcage as much which will help keep the car more free on entry from change in indexing and exit from steer change. If you want to tighten the car up, you can lower the RR bar, which will reduce roll steer and cause the RR spring to index more, tightening entry (more side bite) and the change in reduced steer will also tighten the car up on exit. Personally I like that better. As for location, the further out on the birdcage you install the springs the more they’re going to move. So it all depends on what you want. Having them closer to the center of rotation will make the indexing more stable, but will also require slightly larger changes to manipulate, having them further away is the opposite, they will index more, and small changes will make a bigger difference on it, honestly if you’re building your own.. I would play around with it a bit, maybe find a coil eliminator slider that’s easy to move up and down, and attach it to different spots in a temporary fashion to see what it’s doing, and if that’s what you want it to do or not. I would say anywhere from 5” to 6” drop is good on either side.
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