Cutting Down Bilstein Internal Bump Stops

[jeffnhiscars]

Maybe a dumb question, but do billy sport rears have internal bump stops also?

I cant say with 100% certainty that they dont, but the rear is a shock vs a strut and so would not come apart the same way. I have also never heard of one bottoming which is the only reason to consider cutting it down.

[randomtask37]

Maybe a dumb question, but do billy sport rears have internal bump stops also?

[eLKuRLy]

bumping this thread to find out how much are people cutting off on ix HD's?

[MR 325]

Not my picture but this is how we did it:

[Ryann]

it's pressed in , not screwed in. Get a chisel or similar and gently drive the silver cap off. It is attached to the damper rod and you are not entering the fluid cavity (pressurized) part of the strut. This will expose the bump stop, remove however much you want with a razor blade.

Edit: Also, the yellow outer shell is just a covering, it's inner surface is not what the shock piston rides on (seals against) like a conventional strut. Gently clamping it in a vice is fine.

nice!

[AE86]

We just did this to a friend's car a week or so ago, it was very easy and it rides great on Bilstein HD with IE3 springs.

How much did you cut?

[MR 325]

We just did this to a friend's car a week or so ago, it was very easy and it rides great on Bilstein HD with IE3 springs.

[JGood]

Thanks for this info and pics! Will be doing this to both of my e30's.

[M-technik-3]

Wish I saw this before installing my Billy Sports

Not hard to remove them and on another note you might be able to do a harder durometer for stops.

[kennyvb]

Wish I saw this before installing my Billy Sports

[ak-]

Put the cap back on and tap it on the floor a few times.

[AE86]

nrubenstein or LJ851, how do you re-install the BOTTOM CAP that holds the shocks together? I read from your posts that you were able to "un-screw" and/or "tap out" the cap, so what method do you use to re-install? Thanks for your input, I'm gonna be taking apart my HD's soon.

[jeffnhiscars]

Just curious but does anyone know if Billy HD's and Sport's have the same length and style bump stops?

The half I just removed is 1.5" so figure 3" on a Bilstein Sport PN P30 0334 HO. Keep in mind thats for the 45mm housing and is a 30mm strut VS 36mm for the ones that go in the 51mm housing. The PN on this stop is B36-126A 6 FWIW

[AE86]

Just curious but does anyone know if Billy HD's and Sport's have the same length and style bump stops?

[jeffnhiscars]

For what it's worth, I used channel locks to grab the bottom cap and twisted it off.

I did try that. Perhaps its cause I have the 30mm strut or just the way the Sport is built, but I couldn't get a decent grip on it.

The sad part is that now I have to pull the other strut and cut IT down...unless there's a thread titled "What Happens If I Drive My Car with One Cut Down Bump Stop and One Whole One and Can I Compensate by Increasing Toe In on One Side":-?