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Building
and tuning the Double X4 buggy
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Richard Taylor is
one of the most experienced off road racers in Europe and the UK
today, His racing career covers in excess of 15 years, during
which time he has Competed at all levels from Club to World
Championships.
During this career he has won multiple British National off-road
championships in both 2 and 4 wheel drive as well as countless
European Podiums!
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Building
Tips.
When building the gearbox don't fully tighten the fixing
screws; instead
just back them off a little and this will help make the
gearbox spin more freely.
Also put a little of the White thrust race grease on the
gears this will also reduce wear and increase efficiency.
With the rear kick up shims cut one side out of the
screw hole so you don't have to take the screw fully out
to change them instead you can just slide them in and
out, this will make adjustments to the rear a lot easier.
Put some oil on the shock cartridge o-rings before
inserting the shock shaft, and also only insert the
shaft from the piston end. This will help to stop any
damage being done to the seals.
After fitting the shock cap and seals to the shock shaft,
measure the length of each shock shaft with the ball
joint on and then adjust them so that both the front
shafts and the rear shafts are the same length as each
other before you finally assemble the shocks.
To help free up the bearings try soaking them in motor
cleaner and spinning them on a shaft to remove excess
grease, that is used in the manufacturing. Then re-oil
them with some light bearing oil.
Another tip to make the bearings run even freer you can
remove the inside (the non-visible when fitted in the
car) shield. Make sure you leave the shield on the side
that is exposed, it helps keep dirt out and increases
the life of the bearings.
Although the build quality is very good it is always
worth checking that no
shims are needed in any of the wishbones etc. to remove
any sloop.
Another simple tip is to pre-tap the threads into the
plastic carefully, this will help to make sure you do
not snap a screw or strip the head.
Racing Tips.
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Tuning
Tips
Understeer.
1) Shorten the front camber link.
2) Lower front camber link.
3) Raise the outside of the front camber link on the
caster block.
4) Move the batteries forward.
5)Shorten the rear camber link on the shock tower.
6) If the understeer is on the way in, decrease front
rake/kick up this will load up the front on deceleration
into the corner.
7) If on the way out, increase the front camber for more
steering out of the corner, this will also give less
into the corner.
Oversteer.
1) Lengthen the front camber link.
2) Raise front camber link.
3) Lower the outside of the front camber link on the
caster block.
4) Move the batteries back.
5) Lengthen the rear camber link on the shock tower.
6) If the oversteer is on the way in, increase front
rake/kick up this will lessen the load on the front on
deceleration into the corner.
7) If on the way out, decrease the front camber for less
steering out of the corner, this will also give more
into the corner.
Bad on the rough:
1) Lengthen the wheelbase.
If the car is grounding out badly try:
1) Harder springs.
2) Thicker oils.
3) Increase the pack i.e. go from an orange piston to a
red piston (smaller piston holes = more pack). If this
makes the car feel too stiff in roll, you can at the
same time lower the weight of the oil, by 5 to 10 weight,
this will still make the car stiffer initially but still
have a soft feel once moving.
Raise the car slightly.If the car is bouncing of the
bumps or not riding them:
1) Softer springs.
2) lighter oils.
3) Decrease the pack i.e. go from an orange piston to a
blue piston (bigger piston holes = less pack). If this
makes the car feel too soft in roll, you can at the same
time increase the weight of the oil, by 5 to 10 weight,
this will still make the car feel softer initially but
will still have a stiffer feel once moving.
4) Increase the rear squat if the car is kicking up.
Poor rear traction.
1) Put less rear squat on the car.
2) Move the batteries back.
3) Decrease the pack i.e. go from an orange piston to a
blue piston (bigger piston holes = less pack). If this
makes the car feel to soft in roll, you can at the same
time increase the weight of the oil, by 5 to 10 weight,
this will still make the car feel softer initially but
will still have a stiffer feel once moving.
4) Make the rear camber link longer on the shock tower.
5) Loosen the slipper clutch if it is just wheel
spinning.
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Helger Racing
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