I view all these posts about sub-frame connectors, is the main purpose to stiffen the body from sub-frame to rear spring perch? What is the reasoning to connect the connector to the sub-frame?
I'll give you my take on them. I think the original idea for subframe connectors was to transfer the thrust from the rear end to the subframe in a high horsepower situation. Otherwise, the thrust is transferred into the body shell at the front spring perches and then through the body mounts to the subframe. The subframe, front suspension, and engine/trans is a substantial portion of the mass of the car so you are stressing the body mounts that way. I've never understood how subframe connectors stiffen the car since you'd need a substantial attachment at the rear of the subframe to resist bending at that point, which they don't have. I'm sure others will disagree. I don't have first hand experience driving a car before and after adding connectors.
I've never understood how subframe connectors stiffen the car since you'd need a substantial attachment at the rear of the subframe to resist bending at that point, which they don't have.
Bob, as a person that has 25+ in metal fabricating I totally agree with what you said in your statement that I reposted above.
You will always have flexing (pivot area) at attachment point of the sub-frame & sub-frame connector. Now if a person had solid sub-frame bushings and the sub-frame connectors were welded along side (sistered) the sub-frame that would be much more logical. I would think the inner & outer rocker panels along with roof (coupe) give plenty of lateral support.