Bilstein Bump Stop

Hi i am not sure if this is the correct section but i need new bump stops for my bilstein shocks, are these special bilstein ones or are they the same as standard fiat bump stops?

basically where can i buy new ones?

Cheers

Hi Hubby,

I dont know if Bilstein have special bump stops but I replaced my standard stop and got them from Alternative Autos. They have most parts and prices are good.

Search for their contact number on the site.

Regards

CollieD

hey collieD

can you remember how much they were?

Hubby..if you run the eibachs, you would need to shorten your bumpstops to prevent them from riding.

I got powerflex ones which are firmer but last longer than the standard fiat ones. These would need to be chopped down as well.

IIRC, £20 for the pair with strut sleeves/gaiters.

ah nice one kelv, any ideas where i can buy them from? where & how much do i need to cut off them?

Yep, kelv is spot on, you'd need to chop down an original set of bump stops by quite a bit or your nice Bilsteins will be doing very little.

I have a pair of Powerflex similar to Kelvs, if you look on the Powerflex web page they list a few different sizes, you don't need anything larger than 2" or you'll be limiting your travel.

Thanks jimbo i think these are these correct size?

old worn bump stops measured 57mm dia with 22mm hole, and 2" deep should be ok?

They look just like the ones I have

How much to cut really depends on several factors...one of it is how much your springs are sagging. The older they are, the more they sag..which means more to chop. I chopped mine quite abit.

The bumpstops I got are universal ones. For bore size, measure the shaft at the top of the shocker since you have yours off the car anyway. As for the depth, a short one is sufficient as you only need a lil bit for protection when it does bottom out. In my opinion, the one you have shown is too long and would require chopping.

its 52mm long do think its still to long at that? what would you recommend?

A spring won't sag that much over it's life, maybe only a few mm.
If I was you Hubby I would cut off one of those rings from the Powerflex bump stop to make it so you have a good amount of travel.

The Powerflex is more of a polyurathane sponge unlike the standard bump stop so it doesn't have to be half a mile long for it to work, all it needs to do is stop mechanical contact between the damper and top mount or the spring becoming coil bound.
I've never heard of either happening on a Bilstein/Eibach set up so you don't really need a big stop in there.

What the man says Hubby

cheers, will i also need to cut the rear bump stops?

Yeap but it'll probably break off in the process..so you might as well just remove it completely.

is it ok to remove the rear bump stops all together?

Are there bumpstops on front as well as back?

Hubby...Yes
addict..Yes

The bump stop on the rear lives inside the rear spring mounted at the top. They usually fall out (mot fail) or get removed (mot pass) and I've never heard of the rear end hitting the bump stop or metal to metal with it removed.

hi,
I am looking to replace my rear bumpstops.
I noted that they fell off recently when I replaced the rear dampers

The diameter is about 55mm
It has a depth of about 35mm (Hubby said it has a depth of 2 inches).
I am also not sure at all what is meant by bore size

I was reading the various threads, but I am still confused

Is this the correct link http://www.europerformance.co.uk/pages/products/product_info.mhtml?product=426618

for the size?
# Size: 54 x 57 dia (mm)
# Bore 18-22mm

Cutting them short should not be an issue, right?
The rear springs are standard, and the rear dampers are the original Boge.

Many thanks for your help
regards

They will only fit the front dampers, the rear bumpstop fits inside the spring and is located in the spring top mount by a plug.
Fiat will have the rear bumpstops and all you need to do is cut them down by a few inches.

Hi Jimbo,

many thanks for the advice..
I was thinking that they were for the rears.
I had my fronts and rear absorbers( or dampers) re-worked here locally, and they fitted the front dampers with "bumpstops" and dust-covers.

But they did not have rear bumpstops....hence the slight worry
will therefore get the original fiat coupe bumpstops (or fiat Marea as advised by the local distributor)

P.S. my dampers are now completely serviceable, using back the original casing (BOGE)
It is a twin tube design unlike the expensive Ohlins (mono-tube)
The oil used is silkolene.
They even dyno-tested each damper and the data showed a stiffer set up.
It does feel sharper without any crashing...very pleased with the results
regards

I wouldn't worry too much, lots of guys here run the rears with no bumpstops fitted. Unless you are riding seriously low, like 60mm at the rear then it will not bottom out.

Thanks JIMBO

My coupe uses stock springs all round
in 9 years it has just covered 30,000km
Seldom had passengers at the rear.
So I guess I don't have to worry too much then
It was just that moment when i saw "something FeLL off" that got me worried....very worried !!!

Cheers

Hi,
I had my bump-stops fitted today. It is not the original "spongy" orange color.
It is an after market product that appears to much better made than the original (approximately 9cm long). It is $120 for the pair, about £24
I replaced the top rubber plate (£10 a pair) above the rear springs too.

The originals were not damaged, but since I bought new ones.... a fresh pair would do no harm.

I must report that all the minor crashes that previously intruded into the cabin have now disappeared.
Very pleased with the car now
thanks Kelv, thanks JIMBO
cheers

Glad you got it sorted Saiful. Who supplied you with the parts? Price sounds very reasonable too.

The parts were supplied by a local shop that deals with Italian cars....MS Sprint (of Jalan Ipoh, Kuala lumpur )

I was told that these bumpstops are made from synthetic compound and rubber, perhaps from Thailand.

The bumpstops fit "Perfectly" in to the slot at the top part of the rear springs

There is no harshness that one would expect from "polyurethane" stuff.

The original fiat coupe bumpstops, although clearly inferior, costs 3 times more here in Malaysia

I wonder who goes about buying them.

Has anyone tried cutting them in situ..?
I reckon the rears wont be a problem but it'll be a big job dismantling the front struts again..

Cutting the fronts in-situ? Its possible but very difficult to cut it neatly.
As for the rears, it'll probably snap off before you're cutting it all the way through.

I did it successfully on the fronts (I still had OE Fiat ones on my Billies), will do the rears later.
I cut off the lowest "bulge" (of the two) and yes, it does feel a bit softer over small holes etc now. Not much but still.

Used a sharp knife and made sure it never scratched the shock piston. Then put back the rubber hose/sock over the last existing "buldge". Job done! Did'nt even have to take the wheels off..

It seems the car was actually lying on the bumpstops at the front, since it's ca 10mm lower now!

Some wheels have come off some cars completely in the past

The bumpstop is not there for fun, the suspension arm can hit the subframe and because the arm is cast iron can have one or more cracks after hitting seriously.

A mechanic advised me exactly like what CSP said, there will be some crack (somewhere where metal hits metal) if you hit a big hole.

Anyway, all the rattling noise at the rear of my coupe disappeared after i installed a fresh pair of rear bumpstops

I am very happy with the cushy ride over uneven surface now
Cheers

I have now cut all four bumpstops to half height, as the rears also were very close. I have Eibach's (-30mm or so they say, it seems like 40 to me). Bilstein B6 shocks.

Result: much smoother ride and a little lower front end.

This MUST be included in the guides, or people will miss this..

Yes shortening the bumpstop is essential with any lowered suspension setup. Riding on bumpstops is actually quite comfy but will result it quite a choppy ride as you're not utilizing the dampers properly.

Will look into the guides Per and amend accordingly. Thanks.

This thread has been awesome to read as I have been really disappointed with the ride of my car after fitting billies and eibachs especially over high speed bumps but from reading this it must be because the front is on the bump stops all the time thus providing no damping. I can't wait to go and cut my bump stops down now :-). Thanks guys.

I am in the middle of lowering my car, so also very interested in this thread.
The rear stops had come loose, so are now off the car completely.

My question is how much to take off the front stops to avoid the choppy ride Kelv mentions?

Difficult one to say Iain. It really depends on the condition of your springs (hence how much it would sag) and also the type of bumpstops you would be using. I would chop a portion at a time and see how it sits from there. I chopped a fair bit off mine and although this would still offer some protection to the struts, the reduction in material would result in a harsher bump when the strut tries to bottom out.

Cheers Kelv. My thinking is to take the 35mm that the springs will drop the car by off. Surely that would even things out. However you've got me thinking now, as what you say about the reduction and harshness I hadn't even considered.

Perhaps I'll do as you say and cut less first, then cut again if required. Bear in mind I won't have the option of a road test on these yet, as the car will remain SORN until I've finished all the work.

I cut the first bulb off;

[ ]
( )
( ) <- this one!

Did the trick on mine, I have the 30mm Eibach springs.

Cheers Per,

Just removed the struts today, and having inspected the bump stops came to the conclusion that removal of 35mm may be a bit harsh. This would leave precious little material.
If I remove the first bulb from the front bump stop though, this will remove the part of the stop that holds the attached dust sleeve in place.
I have tried the sleeve on the second bulb, and it appears to hold, but as this is not shaped to fit the sleeve correctly I am unsure if it will become loose or not over time.
Have you had any problems with yours?

Yeah exactly, I just pulled the sleeve over the next bulb!
They seem identical to me and it does still hold the dust-sleeve.

Excellent! Thanks for the confirmation. I'll cut these down in the morning, and should have them on the car by tomorrow night.
Many thanks.