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This is a common discussion I have.
A "Dual Perch" coilovers does not provide better performance, but it provide more ride height adjustment flexibility.
The main advantage is the compression and rebound travel ratio are set (base on the springs pre-load).
Raising or lowering the ride height does not change this ratio, and that mean the suspension will function at either extreme (the highest or the lowest ride height) setting.
The disadvantage depending on how the suspension was designed is that it can lack total damper travel.
Another point brought up is while the damper will function, it is possible for other parts to get in the way at extreme setting.
I personally prefer the dual perch design as it mean you can design a system that will work within it's available ride height adjustment.
You won't get complain of harsh ride quality from bottoming out the damper at the lowest setting.
The long as the suspension are optimised reasonably, then you will get a good performance as well as flexible ride height adjustment.
As far as using longer travel damper and incorporate helper springs to optimise rebound travel, it is something we have done.
But it isn't applicable in the GT86 / FRS / BRZ chassis as there simply isn't the room available without severely limiting ride height adjustment range.
Jerrick
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