Originally Posted by JIM1
Cars such as the Serpent 733 actually have the same length springs all round. I was also under the impression that spring length is not directly proportional to tension?
Directly no, it's not. However, the total length of the wire matters. So if you make two springs, both with the same diameter wire, same diameter coil and same coil spacing but make one longer, it will therefore have a longer total length of wire and be softer.
If you used the exact same length of wire, the longer one would have a wider coil spacing so that both springs had the same amount of coils and would therefore have about the same spring rate.