32
directions VERY quickly during cornering. The second roll stop
insert with a slightly larger opening will have slightly less of this
effect. No roll stop insert (which is what we recommend for a
starting setting) will be the least aggressive for steering during
hard cornering.
WARNING! You must pay very close atten-
tion to tire diameter when using either of the roll stop in-
serts. This is because any difference in tire diameter (side
to side) may cause the dampener post to rest against the
roll stop insert.
Fig. 106
T-BAR THICKNESS AND FLEX Your RC12LC comes
with two T-bars. The #4522 T-bar has a thickness of .063" and
the #4520 T-bar is .075" thick. The .063" T-bar is the recom-
mended thickness for low traction conditions. The .075" T-bar is
recommended for high traction conditions. If you use the .075"
T-bar your car will turn more aggressively but will not be as
smooth accelerating though bumps The .063" T-bar will give
the car more rear traction and will seem smoother through
bumps. We recommend using the .075" T-bar when racing on
smooth carpet tracks with good traction.
Look at the back end of the of the T-bar at the "T" shaped
section. You will see there are three holes which can be used to
attach the T-bar to the lower rear pod plate. You have assembled
your RC12LC using only the two outer most holes. This setup
will make the rear suspension very active (soft) front-to-rear
with very little effect on the side to side stiffness. Your RC12LC
will have more rear traction and will accelerate through bumps
better than if you were using all three attachment holes. This
adjustment applies to both the .063" and the .075" T-bars. Try
using all three attachment holes when racing on smooth, high
traction conditions.
REAR AXLE HEIGHT ADJUSTERS Your car comes
with three sets of rear axle height adjuster inserts (fig. 107).
These inserts allow you to raise of lower the height of the back
of the car without changing tire diameters. Even through there
are only three offsets, they can be installed for a total of five
different axle heights as shown below.
Fig. 107
The #1-up position allows you to use the maximum diam-
eter tire and the #1-down position requires you to use the mini-
mum tire diameter. This adjustment allows you to get more useful
life from a set of tires by adjusting axle height as tire diameter
decreases. You can also adjust the overall height of your car for
high or low traction conditions. For high traction, smooth tracks
and four cell racing, try using the #2-down or #1 down posi-
tions. For low traction, bumpy tracks and six cell racing try us-
ing the #3 #2-up or #1-up positions. These positions will allow
you to use a larger tire which will increase traction and make
help stabilize your car and it also removes a small amount of
turn in steering. Toe-out will allow the car to turn in to a corner
quicker but will reduce stability exiting the corner. Both toe-in
and toe-out will scrub speed so try to use as little, of either, as
possible. You adjust the toe-in or toe-out by adjusting the length
of the steering tie-rod turnbuckles.
Fig.105
FRONT SUSPENSION SPRINGS are available in vari-
ous wire sizes as listed below. Changing springs will increase
or decrease steering. In general a softer spring (smaller wire
diameter) will add steering and a harder spring (larger wire di-
ameter) will decrease steering. Oval racing will normally re-
quire a harder spring than road course racing.
PART NUMBER WIRE SIZE
#4416 (.024")
Harder
#4417 (.022")
#4413 (.020")
#4414 (.018") std. kit.
#4419 (.016")
#4418 (.014")
Softer
DAMPENER PLATE SPRING ADJUSTMENTS The
spring tension on the two dampener plates is preadjusted for
you. If you decide you want to experiment and increase the
spring tension you can use Associated #7368 shims. We rec-
ommend using the standard tension for most track conditions.
The standard setting will make the car very predictable and
easy to drive. If you increase the dampener spring tension the
car will become much more responsive to steering input and
may be more difficult to drive in low traction conditions. It is
very important to keep the dampener plates CLEAN and lubed
for each race. We recommend using the Associated #6636 diff
lube that came with your kit or Green Slime from R/C Perfor-
mance Specialties.
DAMPENER PLATE ROLL STOP INSERTS, #4518,
are included with your kit (figs. 106 and 43). There are two
different size roll stops. Each stop will control the amount of roll
that the chassis can make during hard cornering. The stop with
the smallest side to side opening (in the middle) will reduce the
chassis roll the most. This stop insert will make the car change
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