48
b) Adjusting the Shock Absorbers
The spring elements of the all-wheel suspension of the chassis consists of a
coil spring each with an oil-pressure shock absorber in the centre. The oil-
pressure shock absorbers are fastened to the lower control arms and the top of
the shock tower on the differential housings. On the top, the coil springs rest
against a knurled nut on the outer tube of the shock absorber and the spring
attachment on the bottom end of the piston rod. The spring travel of the piston
rods is limited by silicone sleeves on the lower part of the piston rods.
Twisting the knurled nut upwards relieves the spring. Twisting downwards
increases the pre-tension of the spring. The spring preload can thus be finely
adjusted according to surface and manner of driving.
• A low spring pre-tension lets the chassis sink lower due to its inherent weight.
• A harder setting lifts the chassis.
In this way, a certain higher or lower position of the chassis can be achieved
(setting ground clearance). Hence, adjusting the damping not only affects the
ability of the model to “even out” road unevenness but also its behaviour in
bends.
This is called “oversteering” or “understeering” driving behaviour.
Oversteering driving behaviour
The model "pulls" into the curve, the rear tends to swerve (too little traction on the rear axle or too much traction on the steered front axle). As a counter measure
the suspension should be set softer at the rear (or harder at the front).
Understeering driving behaviour
The model is difficult to steer around the bend, "pushes" the front wheels outwards (too much traction of the rear axle or too little traction of the steered front axle).
As a counter measure the suspension should be set harder at the rear (or softer at the front).
Over-steering or under-steering driving behaviour can be the result of uneven cornering powers of front and rear axle due to incorrect setting of the camber.
As a basic setting the front axle should be approx.. 5 mm lower than the rear axle!
Check the impact of the shock absorbers
• Lift the model at the rear axle and drop it.
• The model should not deflect until lock and only top out once without any reverberation!
• Test the shock absorbers of the front axle in the same way.
Setting the spring preload
• Increasing spring preload: Turn the knurled nuts on the outer tube of the shock absorber clockwise.
• Decreasing spring preload: Turn the knurled nuts on the outer tube of the shock absorber counter-clockwise.
Tuning
By selecting the right shock absorber oil, you can influence the shock absorbing characteristics. The oil normally used in the shock absorbers is perfectly suited
for most applications.
• On mainly smooth ground, we recommend more viscous oil (high viscosity).
• On open terrain, however, you should use less viscous oil (low viscosity).
Do not use any standard engine oil. We generally recommend using pure silicon shock absorber oil only. To further optimize the damper characteristics
we offer silicon oil for the shock absorbers in different viscosities in our accessories.
Summary of Contents for Carbon Breaker Pro
Page 122: ...114 ...
Page 123: ...115 ...
