[LaYzEe]

I was just wondering...On my other car, I have tein s.tech springs with kyb agx shocks and i also changed my stock bumpstops to koni bumpstops. I did a quick search on this forum and didnt really find anything about our bumpstops at all. My question is: How come we dont change our OEM bumpstops if we change to aftermarket springs? Isn't suspension travel reduced when lowering springs are installed? Or is our OEM bumpstops are "good enough" that we dont need to change them? I've also heard some people that even cut them but I wouldnt do it IMO.

I took this from another forum:
Check this out from the e30m3performance website:

"The primary disadvantage of using shorter springs to lower a car is that the suspension travel is reduced... This happens because using a shorter spring brings the upper strut bearing (or camber plate) closer to the top of the strut housing. This pushes the bump stop down and since travel is defined as the distance between the bump stop and the top of the strut housing, travel is reduced. The only way around this is to either use a shortened strut housing or to cut the bump stop...

Cutting the bump stops may seem like a bad idea at first. After all, the bump stop is meant to cushion the impact when the limit of travel is reached due to a particularly large bump. But the fact is, most of the shorter springs that people install to lower their cars are also stiffer. Thus although a lower car has less suspension travel, it also needs less travel since a stiffer spring does not compress as far as a softer spring under identical conditions. So if you can achieve the proper combination of travel and spring rate, then your suspension is less likely to even reach the bump stops."


any comments welcome.

[SantaClawz]

funny you mention bump stops....

i just put these 20's on my car. i had A LOT of rubbing.

so first they rolled the fender, and it still rubbed, but not as much

Then i got realigned, and it still rubbed, but not as much

Then they shave/cut the fender off and it still rubbed on medium/large dips.

Then just today, i had differenet bump stops installed, and i hit the BIGGEST dips of my entire life today, and ZERO rubbing. What a god sent. My rubbing is now completely gone because of these bump stops.

[SantaClawz]

Supreme Power Spp A+++++++

[LaYzEe]

what bumpstops did u install? Did the ride quality change when you changed them also?

[KkSc]

what is bump stop..does anyone has pics about it??

[Sparky66]

Depends which ones we are speaking about here.Some "Bump Stop" rubbers are located inside the top part of the shock absorber and stops the shock absorber from bottoming out at it's extreme compression.

[Bimmer335i07]

A mechanic told me that I should cut the bump stop, when I install the H&R sports springs.

Is that correct?

SantaClawz, which bump stop did you get?

[LaYzEe]

Originally Posted by keith7872

what is bump stop..does anyone has pics about it??

IIRC, bump stops help out the shocks from bottoming out too much



It sits in the upper part of the shocks:

[LaYzEe]

any of you guys using aftermarket bumpstops?

[reggiecmah]

if you put these in the back springs would it raise it?
becuase the Xi's with H&R springs are really slamed in the rear. and i would want to even out the hieghts.