complete, what next?
Join Date: Oct 2012
Location: United Kingdom
It sounds like the springs are incorrect, possibly lower rate (2.0L) springs. Did you notice it sit lower when you fitted them? Have you got a previous photo you could refer to look at wheel arch to wheel clearance?
Springs are rated in N (Newtons=mass x acceleration(g)) per mm of travel, the heavier the weight, the higher the rate. If you put the 2.0L springs on the 3.0L, even though they start out the same length they will deflect much more, because they are rated for a lighter mass. This will only get worse when driving as acceleration (bumps & cornering) x mass = force(N) & force(N)/spring rate(N/mm)=deflection. Your shocks will not stop the deflection, they only control the rate(speed) that the compression and re-bound occur. If they are rubbing, then it IS your springs.
Check the part number you were sent; even if it is correct it doesn't mean the rates are right. I was testing a vehicle with a selection of springs that were rated and colour coded. We were getting very odd and unexpected results on the accelerometers so we put the springs on a tester and the rates as supplied (from Korea :-( )were all wrong; we had to re-rate all the springs and mix and match the ones that were similar.
Question: did you replace the bump stops? People sometimes assume they're unnecessary, but they are an important part of the suspension system, they raise the spring rate at the limit of spring travel to prevent rubbing!
"When I see an Alfa Romeo I lift my hat" - Henry Ford