Any reason you did not put rear sumo spring bump?
My van is a pretty light build and as
@Midwestdrifter said the weight/mass on the front suspension is pretty much set with the engine and transmission. Even with my light'ish van, the front suspension seemed very soft to me before the new Koni's and even after them the front spring rate is just too soft. I am not expecting AMG cornering and handling but it seems to blow through the entire travel very easily on minor hits.
- Van Compass now install Sumo's with most of their lifts including the rear so I was thinking about them.
- A set of front Sumo's SSF-401-54 were an open box item on Amzn so the price was right to give them a try.
- As stated above I think the front is under-sprung and felt this would add more of a 'progressive' spring rate if the Sumo rubber durometer is greater than the OEM bump stop.
After I installed every thing the front spring was about 4-5cm from the bottom of the bump stop so the composite spring will travel this distance prior to engaging with the Sumo. My hope was that this travel distance would suck up all the little cracks and small bumps in the road, then on the bigger bumps and hits the Sumo would increase the spring rate to help give the Koni a chance to dampen. Jury is still out on this, I "think" they have helped but that could be in my head trying to justify the mod.
One thing to remember is I replaced the upper spring rubber 'bushings'. The old ones I took out were about half the thickness of the new ones, so as these compress and break down that 4-5cm air gap stated above will decrease as the suspension sags back down. Its possible the OEM bump stop was also as trashed as the upper bushings the stops appeared in good shape but that is not a definitive method of testing.
The rear is just too stiff for me currently (2500 Cargo) so I will not be adding Sumo's since for me they are not needed along with the $$$. I still have some things to add for my build and then a full van stock up with gear, food, etc, then it will get weighed and things may get changed from there.
Fox remote reservoirs are great shocks and probably a massive step up from my Koni's and Bilstein's. I will be saving my shekles for my KTM 990, I want a kick ass suspension rebuild on that more than I do the van, priorities. . .
Cheers, CD