SUMMIT
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25
hex wrench engagement). The upper pivot ball is normally screwed
all the way in. Negative camber is achieved by screwing the pivot ball
of the lower control arm out.
Note:
When camber is changed, the toe
angle of the wheel has to be reset.
Static Camber Base Factory Settings
Front:
1-degree negative camber each side
Rear:
1-degree negative camber each side
Transmission Tuning
Adjusting the Slipper Clutch
The Summit is equipped with
an adjustable Torque Control
slipper clutch, which is built
into the large spur gear. The
purpose of the slipper clutch
is to regulate the amount of
power sent to the rear wheels
to prevent tire spin. When it
slips, the slipper clutch makes a
high-pitch, whining noise.
The slipper clutch is integrated into the main spur gear on the
transmission. The slipper clutch is adjusted using the spring-loaded
locknut on the slipper shaft and the supplied universal wrench.
To tighten or loosen the slipper nut, insert the 2.0mm hex wrench
into the hole in the end of the slipper shaft. This locks the shaft for
adjustments. Turn the adjustment nut clockwise to tighten (less
slippage) and counterclockwise to loosen (more slippage).
Tuning The Sealed Gear Differentials
When T-Lock is activated, the Summit’s differentials are locked for
maximum traction when climbing or traversing loose terrain. When
T-Lock is deactivated, the Summit’s differentials are “open,” allowing
the left and right wheels to spin at different speeds while turning so the
tires do not scuff or skid. This decreases the truck’s turning radius and
increases steering performance.
The performance of the differentials can be tuned for different driving
conditions and performance requirements. The differentials are filled
with silicone differential fluid, and are sealed to maintain consistent
long-term performance. Changing the oil in the differential with either
lower or higher viscosity oil will vary the performance characteristics of
the differentials. Changing to a higher viscosity oil in the differential will
reduce the tendency for engine power to be transferred to the wheel
with the least traction. You may notice this when making sharp turns
on slick surfaces. The unloaded wheels on the inside of the turn have
the least traction and tend to spin up to extremely high rpms. Higher
viscosity (thicker) oil causes the differential to act like a limited-slip
differential, distributing more equal power to the left and right wheels.
Summit will generally benefit from higher viscosity oil when climbing,
rock crawling, or racing on low-traction surfaces.
Note:
Heavier oil
will allow power to be transferred even with one or more tires off the
ground. This can make the vehicle more likely to overturn.
From the factory, both of Summit’s differentials are filled with SAE
100,000W viscosity silicone oil. Only use silicone oil in the differentials.
Traxxas offers SAE 10,000W, 30,000W and 50,000W viscosity oil to tune
the action of the differentials. Lower-viscosity oil allows the differential
to operate more freely. If most of your driving is done at high speed or
on high-traction surfaces, filling the differentials with lower-viscosity
fluid may improve handling. The differentials must be removed from
the vehicle and disassembled to change/replace oil.
WHEELS AND TIRES
Many types of aftermarket tires and wheels can be adapted for
use on your model. Most will affect the overall width and the
suspension geometry of the model. The offsets and dimensions
designed into the model’s wheels are intentional; therefore,
Traxxas cannot recommend the use of other non-Traxxas wheels
with different speciications. The diameter of the wheels is an
innovative design, and there is a variety of different tires available
for you to experiment with in addition to the tires included on the
Tighten
Loosen
TUNING ADJUSTMENTS
Positive camber
Negative camber
Use higher viscosity
(thicker) diff oil for:
• More power to the wheels
with the most traction
• Racing on low-traction
smooth surfaces
• Better performance for
climbing on uneven terrain
Using lower viscosity
(thinner) diff oil for:
• More power to the wheels
with least traction
• Racing on low-traction
rough surfaces
To achieve a good starting
point for the slipper clutch,
tighten the slipper clutch
adjusting nut clockwise until
the slipper clutch adjusting
spring fully collapses (do
not over tighten), and then
turn the slipper clutch nut
counterclockwise ¼ to ½ turn.
