On the Gillard we've got a rear torsion bar that clamps to the chassis rails with 4 cap screws. Its a pretty hefty item and the fastening is hefty too. If it was secured to one side only, I imagine that I could put my full body weight [around 75Kg] and it wouldn't rotate.
The steel bumper on the other hand is secured via compressed rubber. Its designed to move fore/aft in sitiu in order to absorb a tap from another kart from behind. A heavy hit will bend or break it. From a torsional perspective, it has very little in the way of rigidity. If I undo one side, I can twist it very easily with my hand. It moves around in the rubber mounting. Will the torsional rigidity of the rear of the kart be different with/without it ? Yes of course it will. By how much though ? From my own evidence, it would be miniscule at most.
I can feel the difference running with/without the rear torsion bar on the Gillard - my preference is to run without it most of the time - but I am unable to feel the difference in adjustments to the tension of the rear bumper. I'm an average driver and I respect that those better or more practised than I am, may be more sensitive and be able to detect such changes.
Hope this helps Aquila.
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