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stownsen914 stownsen914 is offline
It's a 914 ...
 
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Join Date: Jan 2008
Location: Ossining, NY
Posts: 1,355
Re: modern bump stops, Mike referenced the Koni ones above. Penske also makes good racing bump stops. Koni and Penske bump stops are very different from the old rubber ones that came on 911s years ago. The rubber kind don't really compress much at all. When your suspension hits a rubber bump stop in compression, your spring rate goes essentially to infinity in a very short distance - like 1/8" or maybe 1/4". Handling is badly affected. Koni and Penske racing bump stops actually compress. They come in different heights, like 1", 2", etc. and are progressive. So they gradually go from whatever your effective spring rate is up to infinity as they compress, but handling isn't as badly affected since it happens over a much wider range of motion.

I'd agree though with comments above that with heavy torsions like you have, it's a bit odd that you're bottoming. Could the shocks be worn or have the wrong damping settings? Let's see if someone with a similar setup can comment, or call an experienced racing shop in your area that is familiar with 911s. Jerry Woods was suggested, definitely a respected shop.

Scott
Old 05-17-2018, 04:31 AM
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