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Blistein HD Bump Stop Mod


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Here are the steps to doing the Bilstein Bump Stop Mod:

 

http://i34.tinypic.com/e5fww2.jpg

 

Ah, the Blistein HD Strut.

 

http://i37.tinypic.com/25utbpc.jpg

 

First start off by removing the nut at the bottom of the strut.

 

http://i33.tinypic.com/ajte2c.jpg

 

Once the nut is removed, UNSCREW the strut with a screw driver instead of a hammer.

 

http://i35.tinypic.com/2ryjxur.jpg

 

Once you unscrew the strut, you can simply pull the entire strut out of the shock housing.

 

http://i37.tinypic.com/24qsh9v.jpg

 

From there, you want to remove the Bump stop from the strut itself.

 

http://i38.tinypic.com/10r1gt0.jpg

 

Measure half the bump stop and then use whichever desired tool you have to cut this in half.

 

http://i36.tinypic.com/2d7ec5d.jpg

 

Once done cutting, put the bottom half of the bump stop back on to the strut and then reassemble the strut using the instructions to remove it in reverse.

 

Proceed to either reassembling or assembling the strut itself with your choice of spring / top hat.

 

From there, Do the other side and bam you are on your way to gaining that "BMW" ride quality.

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Most people are installing lowering springs on their Bilsteins, i.e., Swift Sport Springs, or Tein H-Techs, which takes stroke distance away from the Bilsteins, and which ultimately puts the end of the strut 1-1.5" closer to the bumpstop. By removing part of the bump stop, you regain that strut travel, eliminate the "bump-up" from early bottoming out and smooth out overall strut operation.
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will this mod void bilstein warranty if new ?

 

And what is their new warranty? I think using other than stock springs would void the warranty... but that's just my initial thought

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  • 2 months later...
After reading this thread I'm just curious if this mod removes some of the HD Bilstein harshness? I'm debating whether or not its worth the effort getting another alignment, money for the align, etc. I'm fine with a little bounce that happens when you hit the stop, but if it eliminated some harshness it would be worth taking the struts out again.
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  • 3 weeks later...
Is the mod the same for Spec B Bilstein struts? Also, it looked like the bump stop was made of three sections. After you cut it, were you left with 1 1/2 sections?

 

Yes the mod is the same for Spec B Bilstein struts, or the JDM Bilstein struts for that matter too. TJ cut through the middle of the center section, effectively reducing the bump-stop length by half (or leaving 1.5 sections as you indicated).

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  • 2 weeks later...

Any idea on the torque requirements for the re-assembly?

 

What type of grease should be used when reinstalling the bumpstops and reinserting the strut?

 

Is it possible to take too much out of the bumpstops? I'm going to be running Progress springs (claimed -1.3" up front) so is the 1/2 cut appropriate or should it be less?

 

Thanks for the informative write-up!

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Any idea on the torque requirements for the re-assembly?

 

What type of grease should be used when reinstalling the bumpstops and reinserting the strut?

 

[...]

 

Thanks for the informative write-up!

 

:whore: I'm curious about these issues, too...

sorry...this forum practically blows goat nuts so im not always on here.
Team Pony Express

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Ok, I need a set

Where are you guys buying these?

Also I apparently need Spec B tops? Why, I dunno. I hope the fact that I have swifts for my 05' doesn't cause issues with the install.

 

I got mine from what's now Fred Beans Parts - http://www.fredbeansparts.com/servlet/the-987/Bilstein-Subaru-Legacy-GT/Detail

sorry...this forum practically blows goat nuts so im not always on here.
Team Pony Express

POSTED FROM MY COMPUTER USING A WEB BROWSER

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Any idea on the torque requirements for the re-assembly?

 

What type of grease should be used when reinstalling the bumpstops and reinserting the strut?

 

Is it possible to take too much out of the bumpstops? I'm going to be running Progress springs (claimed -1.3" up front) so is the 1/2 cut appropriate or should it be less?

 

Thanks for the informative write-up!

 

See the how-to R&R the struts/shocks manual excerpts below. Includes torque specs for both the front and rear struts.

 

WRT the grease, keep your work area clean and just capture the grease off of the bumpstop portion that you remove, add that back in to the strut base, and you should be good to go.

 

Not sure of the spring rate on the Progress, but starting at the top of the middle layer would seem to be a good starting point, and I'd definitely not go below the halfway point on that section. Just make sure that where you cut it, you have a full-width cross-section at the top and bottom of the bumpstop before you put it back in.

07 - Front Strut.pdf

06 - Rear Shock Absorber.pdf

- Pro amore Dei et patriam et populum -
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See the how-to R&R the struts/shocks manual excerpts below. Includes torque specs for both the front and rear struts.

 

WRT the grease, keep your work area clean and just capture the grease off of the bumpstop portion that you remove, add that back in to the strut base, and you should be good to go.

 

Not sure of the spring rate on the Progress, but starting at the top of the middle layer would seem to be a good starting point, and I'd definitely not go below the halfway point on that section. Just make sure that where you cut it, you have a full-width cross-section at the top and bottom of the bumpstop before you put it back in.

 

Thanks.

 

I have the shop manual for my LGT, I was looking for the torque specs for putting the Bilstein strut back together once you've opened it up to do the bump stop mod (i.e. that nut on the bottom and the strut itself).

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Sorry - forgot about that single nut. Here's a link to some bottom of the strut pictures for additional how-to clarity. There's no mention of the torque specs, but I'll keep looking.
- Pro amore Dei et patriam et populum -
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