• Turmoil ARR
www.sportwerksRC.com
Differential Fluids
Changing the viscosity of the fluid in the differentials affects the way the car
handles and performs. The Turmoil
™
differentials come pre-filled with 5000
wt. in the front and center and 1000wt. in the rear. For most conditions, this
is a good place to start.
Center
: Changing the fluid in the center differential affects the front-to-rear
drive. To conceptually understand how the front differential affects handling,
think of it as front-wheel vs rear-wheel drive. Heavier diff fluid gives more
rear-wheel drive effect, resulting in more acceleration and more on-power
steering. Lighter fluids in the front differential allow it to unload during
acceleration, giving more front-wheel drive and reducing power-on steering.
When your car under-steers during acceleration, try switching to heavier
fluid in the center differential. When your car over-steers during acceleration,
try switching to lighter weight diff fluid in the center. Typically the optimum
center differential fluid is between 3000 to 10,000wt. depending on the track
conditions (slick surfaces = lighter center diff fluids).
Front
: The viscosity of the fluid in the front differential affects overall
steering authority. Heavier fluid reduces steering while lighter fluid gives
more steering. However, if the fluid used in the front diff is too light, the
steering can become inconsistent, especially when accelerating from corners.
Typically the optimum front diff fluid is between 3000 to 7000wt.
Rear
: The fluid in the rear differential affects cornering traction and overall
steering. Lighter fluid in the rear diff gives more cornering traction and more
steering, while heavier fluid reduces rear side bite while reducing steering
authority. Some racers replace the fluid in the rear differential with thin
grease for even greater rear cornering traction. Nearly all the racers use
1000wt. fluid or light grease in the rear differential to get maximum rear end
traction.
Choosing Tires
The single most important factor affecting the car's handling is tires. Before
you begin changing your setup, it’s important to choose the best tire for the
conditions. While experimenting with various tread designs, compound and
liners is the optimum way to find the best combination, it’s time-consuming.
If time is limited, find out what tires the fast guys are using and duplicate
their selection.
Caster
The Turmoil offers two caster positions: arms forward and arms rearward.
Moving the clip in front of or behind the upper front arms easily changes
caster position. The rearward position gives slightly more steering in the
mid-section and exiting turns, while reducing the steering on entry. The arms
forward position gives more steering at corner entry, while slightly reducing
the midsection and exit cornering authority.
Shock Locations
The Turmoil offers 3 lower rear shock positions and 2 lower front positions.
Several upper shock locations are available.
Lower Shock Positions
Moving the lower shock mounting position will change the suspension’s
mechanical advantage. Moving the mounting position inward has a similar
effect as using softer springs and lower weight oil. Moving the lower
mounting position outward is similar to stiffening the spring weight and
increasing the oil weight. If the suspension is too soft (bottoming out),
moving the lower shock outward will increase the rate. If the suspension is
too hard (lack of traction), moving the lower suspension mounting position
inward will decrease the rate giving more traction. Remember, the optimum
setting is a fine balance between the front and rear.
Upper Shock Position
Moving the upper shock mounting position inward gives a more
progressive spring, and dampening rates increase more quickly. Standing
up the shocks “to their outer mounting positions” gives more linear
dampening and spring rate.
Note
: There are two sets of upper mounting positions located on
the shock tower. The uppermost holes are used when the shock is
positioned in the inner mounting position on the arms. The lower
set of holes is used when the shocks are mounted in the outer
suspension’s arm positions.
Set Up Tips
