BRP ski-doo MACH Z 1000 SDI, Руководство пользователя

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SECTION 11 - COMPETITION PREPARATION
MMC2005-001_11A.FM
11-3
Track
• Best performance and speed is achieved by in-
stalling a 136” x 15” with 1.75” lug height.
• 136” Track extension kits are available in limited
quantities. Contact Ski-Doo Race Dept. for avail-
ability and information.
Transmission
• Clutch setups will be similar to Sno Cross. Due
to higher speeds than Sno Cross, an increase in
gearing is required, depending on length and
steepness of course.
HILL CLIMBING
Front Suspension
• Use soft springs. You want the skis to compress
very easily and not transmit any upward force
into the chassis.
• Use minimal compression and medium re-
bound dampening in the shock absorbers and,
the gas pressure can be reduced to 1379 kPa
200 PSI.
Center
• Use medium spring pressure. You need some
track pressure for traction but the front arm
must be able to compress easily to absorb
bumps.
• Use minimal compression and medium re-
bound dampening in the shock absorbers.
• The limiter strap should be fairly short to keep
front end lift to a minimum. Two to three inches
of lift is plenty. A balance must be maintained
between having enough traction and keeping
the front end down for steering.
Rear Suspension
• Spring pressure should be kept firm in order to
reduce weight transfer and help keep the front
end down on the ground.
• Medium amount of compression and enough
rebound to control the stiffer spring settings to
prevent the rear of the machine from “pogoing”.
Track
• Use a “finger” type track with a 1.75” to 2.00”
lug height profile. Beginning of season or fresh
snow, use a track with a 1.75” lug height and
later in the year when the hill has a lot of ice,
use a 2.00” lug height track.
• Use a 144” X 15” track for best performance.
• For information regarding chassis extension
kits, contact Ski-Doo Race Dept.
• Check with the race organization for rules re-
garding changing of tracks.
Transmission
• Good backshifting is important. Use a few
pounds more than normal preload on the driven
pulley.
• Adjust the TRA to maintain optimum RPM.
Driving Style
• Contrary to popular belief, constant full throttle
is not always the fastest way to the top. Use
your thumb to adjust for the conditions. Some-
times you need to back out of it to keep the
track from spinning excessively. You need to
keep your momentum up but you must keep
the sled on the ground so your track is hooked
up and the skis can steer you around any obsta-
cles.
DRAG RACING (ICE AND GRASS)
Special Rules
• Snow flap must be retained by 3 mm (1/8 in)
diameter cable.
• Double limiter straps are required by many orga-
nizations.
Front Suspension
• Lower the ride height by installing shorter
springs, limiter straps or spacer inside the
shock to limit suspension travel. Maximum
shock length is 360 mm (14.7 in) with 15 mm
(.59 in) of spring preload.
• Trim the rubber blocks under the ski legs to re-
duce and adjust the amount of heel pressure on
the ski.
• Use steel runners on the grass and stock trail
carbide runners on the ice.