Don't expect significant change or for me no different. Car manufacturer use stronger steel composition for stiffness and complex dampeners (bushing position, type, insulation etc) for NVH. Dropping a metal bar does not equates to the sheer dynamic stress during driving nor the ability to absorb impact. It has to be design from the ground up taking into consideration vehicle dimension, weight, height etc etc.
If Polyurethane Foam injected into cavity spaces can stiffen a chassis, car manufacturers would have used it. Perceived improvement maybe from placebo effect. PU foam may reduce vibrations in thin metal panels but in hardened and thickened chassis framework, would have minimal benefits. Long term is risk from corrosion when water gets absorbed into the PU foam.
Actually if your car doesn't suffer flood or any other issues, there's no corrosion issue at all, my car has been filled with auto foam in the under carriage of the car, no signs of corrosion when doing undercarriage work 😊 but yeah maybe it will in the future
@@tooooooot5749 I know what you mean but fun fact is that my proton satria neo's a pillars are filled with foam, doesn't know if it's original or the previous owner done
Yes, PU is hydrophilic in nature ie it absorbed water over time. Some absorbed more than others, so i don't know about autofoam PU. Observed it when we change the cooling media from oil based to PEG and the PU roller swelled.
