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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
PDS shock workings and history.
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[QUOTE="blohman, post: 657655, member: 33652"] It is nice to finally hear the difference between the Ohlins and WP, that explains a lot as the bypass on the WP is deffinately restrictive. WP improved flow through the bypass after 98 but they are limited by shaft size, this is why they use an 18mm shaft. There is much more area available around the OD of the piston for bypass but the piston probably cannot form a tight seal against the shock body durring those last few inches of travel on the Ohlins limiting the amount of low speed damping that can be generated, perhaps that is not a problem. Do not use the KTM specs for pds spring comparisons, I have tested nearly all and the latest generation (5,6,7,8) are more progressive than 1,2,3,4. The newer springs get stiffer at about 1/3 travel and carry through hence offering more bottoming resistance but also more midstroke stiffness. I still prefer the new spring (today anyways) as for low to mid speed movements the bike handles better. I keep making the secondary stack softer and softer with good results while trying to find a good compromise between bottoming and midstroke stiffness. I think I will try Race Techs new spring so I can make the bottoming stack even softer. It is really interesting to see KTM's 04 setup. For that to work they will definately need the longer needle but with a really soft bottoming valve stack unless they found a way to create more bypass flow. It seems that right when I am ready to give up on this system some idea comes along to make it a little bit better. All of PDS advantages have nothing to do with bump adsorption except possibly one, the inertia of the sytem may be less than a linkage allowing it to react better if the hydraulic flow issues can be solved. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
PDS shock workings and history.
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