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Registered
Join Date: Jul 2002
Location: Sydney, Australia
Posts: 2,477
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Bump stop mod for rear Bilstein shocks - recommended?
Is this mod recommended? (ie. choppping off the top 1" of the bump stop to prevent bottoming out)
I have seen recommended by a few places (can't find any of the links...) I ask because I have just had my shocks rebuilt and they are about to go back into my 2.7RS replica race car. With a full cage and 30mm rear torsion bars the car is pretty stiff. I am wondering whether bottoming out is likely to be a problem. However, I also do tarmac rallies in the car and these are hard on everything. Cheers - Ryan 2.7RS replica (race car) 79 930 Porsche/KREMER (street car - very sensible choice...) |
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Registered
Join Date: Jan 2002
Location: Long Beach CA, the sewer by the sea.
Posts: 37,750
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You need some of the bump stop. IMHO, the originals were designed as a damper/stop. You got a little cushion if you bottomed. If you're not worried about the cushion, cut 'em. But if the shock bottoms out metal to metal, there is likely to be damage to the shock or the mount.
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Registered
Join Date: Jul 2002
Location: Sydney, Australia
Posts: 2,477
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Thanks Milt - the mod I have seen does not entail removing all of the bump stop just cutting off about the top 1" (there is an existing groove around the bump stop where the cut is made) I don't think this would allow the shock to bottom out completely.
I am more concerned as to whether you actually gain anything from this mod - ie. what is the advantge of the little extra shock travel or, to put it another way, later bump stop activation? Ryan |
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Formerly bb80sc
Join Date: Aug 2001
Location: Hollywood Beach, CA
Posts: 4,361
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The info is on the smart-racing.com site;
http://www.smart-racing.com/ProdCat/Suspensions 911/Susp911.htm Scroll down the page, it's an SRP TechTip near the bottom. You basically cut off 2 of the 3 rubber pieces. I did it and it works great, especially for a lowered car.
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Cheers -Brad 2015 Cayman GTS 2015 4Runner Limited |
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Registered
Join Date: Jan 2002
Location: Sydney, NSW, Australia
Posts: 1,520
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Quote:
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Registered
Join Date: Jul 2001
Location: Lawrenceville GA 30045
Posts: 7,378
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Is there a certain amount of lowering where this mod is suggested/required? I'm about to install new Bilsteins front and rear on my daily driver (stock torsion bars) and plan on lowering around Euro height. The Smartracing sight doesn't give any specific information on this.
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Mark '83 SC Targa - since 5/5/2001 '06 911 S Aerokit - from 5/2/2016 to 11/14/2018 '11 911 S w/PDK - from 7/2/2021 to ??? |
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Back in the saddle again
Join Date: Oct 2001
Location: Central TX west of Houston
Posts: 56,053
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yeah, that's my question, when should you perform this mod??
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Steve '08 Boxster RS60 Spyder #0099/1960 - never named a car before, but this is Charlotte. '88 targa ![]() |
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Formerly bb80sc
Join Date: Aug 2001
Location: Hollywood Beach, CA
Posts: 4,361
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My SC is at Euro ride height and I noticed a difference right away, especially in hard turns. One caveat, though, if you run wider wheels/tires up front, you may experience slight rubbing after the mod since the shock travels further. I run 225's on my SC and it did rub a bit where as it didn't before. 22mm torsion bars cured all problems. I think this mod is intended for a more aggressive setup anyway, though.
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Cheers -Brad 2015 Cayman GTS 2015 4Runner Limited |
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