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Fox RP3

DHPeteinSC

DHPeteinSC

Monkey
Nov 17, 2006
484
0
In the KY (jelly) E-town
Anyone know if the damper shaft on the RP3 is pressurized with nitrogen, or can it be bled like the DHX5? My Pro pedal and rebound have stopped working and was thinking of adding '' moar shimz'' anyways:rofl: Any help would be great.
 
slimshady

slimshady

¡Mira, una ardilla!
Dec 20, 2007
5,410
3,267
A long time ago, in a galaxy far, far away...
Manifesto said:
oxygen is 70 something percent nitrogen....science tells me this will make you 32.089124765% faster, can't argue with science
Click to expand...
That's air, not Oxygen. Air is composed of 78% of Nitrogen, 21% of Oxygen, and about 1% of Carbon Dioxide and other rare gases such Argon, Krypton, Xenon, etc.

BTW, I think just BoostValve (cough, SPV, cough) equipped shocks are pressurized. Look for the BV sticker. If you can't find it, then yours isn't. Fox offers BV shocks with standard pressure settings: 175, 225 and 250 PSI IIRC, but for several bike companies they have manufactured shocks with custom pressures.
 
Last edited:
Lelandjt

Lelandjt

Turbo Monkey
Apr 4, 2008
2,514
827
Breckenridge, CO/Lahaina,HI
slimshady said:
I think just BoostValve equipped shocks are pressurized.
Click to expand...
No, all Fox shocks are pressurized. Because the piston displaces fluid during the stroke you have to have an IFP with air or nitrogen on the other side. If it was just at atmospheric pressure the shock would cavitate so it has to be pressurized. BV equiped shocks have a pressure sensitive valve so changing this pressure affects compression damping as well as spring rate. In non BV/SPV shocks the IFP pressure only affects spring rate so custom pressures aren't offered.
 
slimshady

slimshady

¡Mira, una ardilla!
Dec 20, 2007
5,410
3,267
A long time ago, in a galaxy far, far away...
Lelandjt said:
No, all Fox shocks are pressurized. Because the piston displaces fluid during the stroke you have to have an IFP with air or nitrogen on the other side. If it was just at atmospheric pressure the shock would cavitate so it has to be pressurized. BV equiped shocks have a pressure sensitive valve so changing this pressure affects compression damping as well as spring rate. In non BV/SPV shocks the IFP pressure only affects spring rate so custom pressures aren't offered.
Click to expand...
Great! Thanks for making things clear. I now have a better understanding of how shocks work :thumb:
 
DHPeteinSC

DHPeteinSC

Monkey
Nov 17, 2006
484
0
In the KY (jelly) E-town
Thanks guys! Until I find the right needle to re-pressurize the IFP chamber, I think I'll hold off on the custom tune. Have 2 needles for moto shocks, but discovered they are too big. Got an email in to RaceTech to see if they have the correct size, so hopefully I can do some tuning this week. Thanks again.
 
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