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US BUMPER DAMPERS questions....?

Hi PPMs,

I'm managing an amortising system for my 935 bumpers, using US bumper dampers to help protecting the body and keep safe the engine bay as much as possible.....

I just want to know how are they made, inside...?....what's the technology...and can I screw at the bottom....?

Thanks for your answers.....










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Old 02-02-2008, 08:30 AM
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Smart idea. 911s are totaled out by fairly minor rear-end crashes, and the trend to 'save weight' by using fiberglass can mean the end of a dream - from a minor collision.

You might want to reinforce that rear bar with a strip welded in the channel.

I believe the US shocks are gas filled and are pierced when a collision occurs, ths damping the impact.
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Old 02-02-2008, 10:01 AM
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Craig, I want to leave the bumper completly free in case of crash, only sliping under the rear fenders...no screws on the body / wings, or nylon screws, being afraid of wringing the rear fenders...I'll probably fit a reinforcement, but not welded, probably screwed with the possibility of moving...I'll think about that.....
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Old 02-02-2008, 11:06 AM
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I meant just add a piece into the forward section of the channel you made - it will reinforce the cut/welded sections you did to achieve the two curves towards the middle of the rear bumper.

J'ai signifié juste ajoute un morceau dans la section effrontée de la chaîne que vous avez fait - il renforcera les sections coupure/soudé que vous avez faite atteindre les deux courbes vers le milieu du pare-chocs postérieur.
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Old 02-02-2008, 12:37 PM
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Ok...sorry...I didn't understand...I thought you meant ..at the end...Yes...great reinforcement..... I'll do it with iron plates....and also, probably another plate in the meddle between the 2 dampers, but welded 90° / main surface....

About the weight, anyway, loosing 3 or 4 kilos is nothing, compared with loosing the rear end of the car....
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Old 02-02-2008, 12:47 PM
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Right on, looks good to me and a lot safer for road use!
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Old 02-02-2008, 01:01 PM
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Works on prgress.....

Here are some more pics about my rear bumper reinforcement.......

The bumper will only been attached with a little bracket at each end, with an adjustable plate screwed on the main steel part: on each side, I add 3 "twolock' nuts with "prisonner" rings and screw-cuttings on the steel to maintain and adjust precisely the bumper....















And in case of racing.....

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Last edited by 935TURBO; 02-24-2008 at 10:56 AM..
Old 02-24-2008, 10:48 AM
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Very nice! I keep meaning to do something like that for under my fiberglass bumper but something always seems more important. I hope I don't reqret that
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Old 02-24-2008, 04:17 PM
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+1

Quote:
Originally Posted by 125shifter View Post
Very nice! I keep meaning to do something like that for under my fiberglass bumper but something always seems more important. I hope I don't reqret that
Old 02-24-2008, 06:03 PM
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+2 but I just hate putting any wieght in that spot.
How about aluminum? I have plenty of aluminum tubing, would be better than nothing which is what I have now.
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Old 02-24-2008, 08:58 PM
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Brian, of course...you're true...but stock bumpers are aluminium...and heavier than my iron one......and anyway....what are a few kilos more compared to keep safe the rear body of my collector...

The other problem is the welding of the parts...I don't have the right tools.....here, all the welds are stainless steel and home made with my little welding station....hope to be right that time.....
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Old 02-25-2008, 12:45 PM
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I was under the impression that the US dampers would rebound after 5 mph (or less) impact. That was the intent of the NHTSA regulation. If they were rendered inoperable after impact, than Porsche could have just used the euro tubes, no?
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Old 02-25-2008, 12:58 PM
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