Quote:
Originally Posted by chrisbalich
I agree with Scott & Magnus.
Switching to coilovers doesn't diminsh the loads through the banana arms. Much of your thrust, engine braking, and rear braking forces run through those mounts. The spring plate takes some of those forces, but not all.
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I mean to say the forces on the tube it self are much less without the torsion bars. All the system does now is locate the control arm pivot point.
With the design of the early 911 rear suspension, the loads for braking and acceleration are mostly held by the spring plate mount. I am using the Elephant racing ASP rear suspension and have of course used the reinforcement weld on plates.
Basic math will tell you that the inner LCA mount takes about 20-30% of load inline with vehicle. This is not a small amount so reinforcement is absolutely required. I believe the boxing of the control arm mounts to the cut tube and opening cut in the chassis is enough, but triangulating the tube to the chassis and perhaps adding additional tube supports could be worth while.
I've put about 500 (hard) miles on the setup and have been inspecting everything often. No issues yet... My car is making about 350whp/tq currently.