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  1. #1
    mnt bike laws of physics
    Reputation: yogiprophet's Avatar
    Join Date
    Jan 2006

    Tuning a Fox RP2 shock

    I am wanting to find out info on how to tune the Boost Valve (IFP Pressure) and Velocity Tune on a new RP2 Fox shock myself. Can it be done? I am willing to buy tools if necessary.

    What i want is to decrease the IFP pressure to 175 psi and to increase the Velocity Tune to its maximun - this would equate to maximum Pro-Pedal. I've never taken a Fox apart but I have taken DT Swiss shocks somewhat apart and Leftys completely apart so I'm no tard.

    Any help with this would be very appreciated.

  2. #2
    mtbr member
    Join Date
    Feb 2010
    Not sure how the "boost valve" fox shocks work. IFP pressure on the fox inline shocks without "boost valve" doesn't seem to be a tuning element. Too little pressure and you risk cavitation etc.

    If you know what you're doing, pull it apart and give us a look at the internals. From that it should be possible to work out what sort of tuning potential there is.

    If all else fails, you can always put it back together and send it away for a service or tune.

  3. #3
    Reputation: derby's Avatar
    Join Date
    Jan 2004
    This thread may give the details of changing IFP pressure in a Float shock.

    Breaking and entering the damper circuit on a Fox air shock

    The "Boost" valve is pressurized by the IFP pressure to the damper oil, and then Boost damping is progressive increased from shock shaft compression raising the IFP pressure. For the Float PR shocks with Boost 225 psi is the minimum pressure Fox uses for a "light" internal tune.

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