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Technical
Information and Installation Tips
Tuning the JounceShock-
The JounceShock comes with a general tuning that should work
well in most applications. However, vehicle handling and dynamics is
a matter of personal preference and this system can be tuned to suit
individual tastes and uses. There are four parameters of the JounceShocks
that may be tuned; the initial nitrogen pressure, the compression damping,
the rebound damping, and the oil fill.
Tuning Nitrogen Pressure-
The primary tuning parameter, and the one that makes the biggest performance
difference, is the initial nitrogen pressure or charge. The nitrogen
can be discharged and recharged to a different setting. To do this
the JounceShock must be removed from the vehicle, but it does not need
to be disassembled. The oil in the JounceShock is mixed with the nitrogen
so care should be taken when discharging the nitrogen to assure that
no oil is lost. It is recommended that the JounceShocks be stored with
the shaft end (Schrader valve) up for 20-30 minutes prior to being
discharged. This will allow the oil and nitrogen to separate and the
oil to fall to the bottom of the JounceShock. Then the JounceShocks
may be carefully and slowly discharged while keeping the Schrader valve
upright to avoid oil loss. Access to the Schrader valve is gained by
removing (unthreading) the contact foot at the end of the shaft (e.g.
Domed Foot or Cupped Foot). You will see a yellow Schrader valve cap
recessed in the end of the shaft.
The yellow Schrader cap must be removed to access the Schrader valve
for both charging and discharging. A Fill Extension (#25515) is required
to charge the JounceShock as the Schrader valve is recessed in the
end of the shaft. The nitrogen charge in the JounceShock is preset
at 80 psi for the 3" travel (#25715) and 150 psi for the 1.5" travel
(#25710) . We do not recommend charging below 40 psi or above 500 psi.
Screw the Fill Extension onto Schrader valve body and snug hand tight
to get a good seal. (Warning: Care should be taken when installing
and removing the Fill Extension. Over tightening of the Fill Extension
could cause the Schrader body to back out when removing.) Nitrogen
is recommended for charging as it is inert and has good temperature
characteristics. An air chuck will work to charge the shock by engaging
the end of the Fill Extension. Set the nitrogen tank regulator to the
desired pressure and engage the air chuck long enough to assure that
the pressure has equalized in the JounceShock. Remove the air chuck
quickly to minimized pressure loss.
Tuning Compression and Rebound Damping-
Compression and rebound damping can be adjusted externally without
removing the JounceShock from the vehicle. There are two ports crossed
drilled in the shaft end that accept a 1/8" hex key. These ports are
shown in Figure 3. The compression damping port is marked with a "C"
and the rebound is marked with an "R". Turning the adjuster clockwise
will increase the damping. These adjustments are for fine tuning and
can be turned all the way in (clockwise) or all the way out (counter
clockwise) up to the snap ring retainer. Care should be taken when
adjusting to full open so as to not force the adjuster past the snap
ring, causing possible depressurization.
Tuning Oil Fill-
Oil level in the JounceShock is set at the factory. The oil level is
adjustable, but tuning of oil level is complex. The factory setting
for the oil level will work in the majority of applications.
The easiest practice is to measure the oil drained during rebuild and
refill The JounceShock with the same quantity of oil. Oil may be purchased
separately (Torco Shock Oil Part No. T830007).
See Rebuild Kit instruction sheet 98712 for more information on disassembly
and reassembly. |
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