Serpent Seven20 Guide de l'utilisateur
SETUP BOOK
1/10TH SCALE 4WD COMPETITION CAR
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CONTENTS
INTRODUCTION 3
SECTION A - BASIC SETUP 4
A1. DOWNSTOPS 4
A2. SHOCK ABSORBERS 5
A3. TRACK-WIDTH 6
A4. RIDE HEIGHT 8
A5. CAMBER 8
A6. CASTER 10
A7. TOE 10
A8. ANTI-ROLL BARS 12
A9. SUSPENSION TWEAK 12
SECTION B - ADVANCED SETUP 15
B1. ROLL CENTER 17
B2. DOWNSTOPS 19
B3. RIDE HEIGHT 20
B4. SHOCK ABSORBERS 20
B5. TRACK-WIDTH 24
B6. CAMBER & CAMBER RISE 24
B7. CASTER 26
B8. TOE 27
B9. ANTI-ROLL BARS 28
B10. CENTAX-3 CLUTCH 29
B11. 2-SPEED TRANSMISSION 32
B12. FRONT AND REAR AXLES 33
B13. DIFFERENTIALS 33
B14. FRONT AND REAR GEAR DIFFERENTIALS 33
B15. FRONT BALL DIFFERENTIAL (Optional) 35
B16. REAR BALL DIFFERENTIAL (Optional) 36
B17. FRONT ONE-WAY AXLE (Optional) 37
B18. FRONT SOLID AXLE (Optional) 37
QUICK REFERENCE 38
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INTRODUCTION
Setting up a racecar with fully independent suspension, like your Serpent
720, is necessary to make the car perform well. We have developed these
straightforward procedures to help you set up your car properly and easily.
Always follow these procedures step-by-step, in the order presented, and
always make sure that you make equal adjustments on both left and right
sides of the car.
These setup guidelines are divided into two major sections.
• Section A: Basic Setup - describes default settings for your Serpent 720.
• Section B: Advanced Setup - describes the effects of setup changes.
Setup Order
We have determined that you should set up your Serpent 720 in the order
indicated in the table below. The order of the settings has been determined
as the most logical to set up your Serpent 720 properly and easily. Also,
certain settings must be made before others, as changing one setting will
impact another setting.
The table below gives you a breakdown of what components need to be
attached on the car, and what you will need to measure the settings.
For example, to set the downstops:
• Detach the shocks.
• Detach the anti-roll bars.
• Remove the wheels.
• Use a setup system (downstop blocks & gauge)
• Use a at board.
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SECTION A - BASIC SETUP
Section A: Basic Setup describes the default settings for the Serpent 720 and
how to adjust those settings. We strongly recommend you thoroughly read
this section so you understand how the settings are adjusted.
The setup described here is a good starting point. After rebuilding the
chassis, or in case you become lost with your setup, always return to the
setup described here.
If you choose to adjust the settings to better suit different track conditions,
see Section B: Advanced Setup. Make small adjustments, one at a time, and
see if you nd any improvement in handling with each adjustment. We advise
you to keep track of your setup changes, and record which setups work best
at different racetracks under various conditions.
A1. DOWNSTOPS
Downstops limit how far the suspension arms travel downward (which
determines how far upward the chassis travels). Make sure you adjust
downstops so they are equal on both left and right sides of the car.
Initial Steps
A. Shocks: It is not absolutely necessary to remove the shocks, however you
must be sure they are long enough not to limit the suspension travel. Be sure
the suspension is reaching the downstop limits before the shocks are fully
extended. Also ensure that there is not an excessive amount of preload on
the shocks, or the downstop values may appear to be lower than actual.
B. Front anti-roll bar: Loosen the setscrew from the front anti-roll bar
mounts and push the blades apart so they are not engaged.
C. Rear anti-roll bar: Disconnect one ball-joint from the rear anti-roll bar.
D. Wheels: Remove the wheels from the car.
Setup Apparatus
Check downstops using a downstop measuring set and at reference surface
such as those offered by HUDY.
A1.1 MEASURING DOWNSTOPS
Using the measuring gauge, measure the
distance from the reference surface to the
bottoms of the front steering blocks / rear
hubs.
• Positive numbers on the gauge indicate
the distance (in mm) ABOVE the top
level of the elevating blocks (or, above
the bottom of the chassis).
• Negative numbers on the gauge indicate
the distance (in mm) BELOW the top
level of the elevating blocks (or, below the bottom of the chassis).
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A1.2 SETTING FRONT DOWNSTOPS
Front Downstop Default Setting = +1mm
Set the front downstops so the bottoms of
the steering blocks are at +1mm on the
gauge.
(Actual measurement = 1mm above top
level of elevating blocks, or 1mm above the
bottom of the chassis).
Adjust front downstops by turning the front
downstop setscrews into or out of the front
bulkheads.
• To increase the front downstop value, turn IN (CW) the front downstop
setscrews INTO the front bulkhead.
• To decrease the front downstop value, turn OUT (CCW) the front
downstop setscrews OUT OF the front bulkhead.
IMPORTANT!
Make sure you adjust front downstops so they are equal on both left and
right sides.
A1.3 SETTING REAR DOWNSTOPS
Rear Downstop Default Setting = 7mm
Set the rear downstop screws so the bottoms
of the rear hubs are at +7mm on the gauge.
(Actual measurement = 7mm above top level
of elevating blocks, or 7mm above the bottom
of the chassis).
Adjust rear downstops by turning the rear
downstop setscrews in or out of the rear lower
arms.
• To increase the rear downstop value, turn IN (CW) the rear downstop
setscrews so they protrude more below the arms.
• To decrease the rear downstop value, turn OUT (CCW) the rear
downstop setscrews so they protrude less below the arms.
IMPORTANT!
Make sure you adjust rear downstops so they are equal on both left and right
sides.
A2. SHOCK ABSORBERS
Shock absorbers, or shocks, are the suspension components that allow the
wheels to keep as much contact as possible with the track surface. The
Serpent 720 has fully-independent front and rear suspension, meaning that
the suspension at each corner of the car (front left, front right, rear left, rear
right) moves and may be adjusted independently of the others. As such,
there is a shock absorber at each corner of the car.
Damping, mounting position, spring tension, and spring preload are all
characteristics that determine how the shock performs. The shock absorbers
on the 720 must be disassembled to change the shock oil and pistons in
order to alter the damping.
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Initial Steps
A. Shocks: To adjust shock damping, remove the shocks from the car
by unscrewing the upper and lower shock pivotballs. You do not need to
disconnect the shocks to adjust spring preload (for ride height adjustment).
Setup Apparatus
None
A2.1 ADJUSTING SHOCK ABSORBER DAMPING
Front and Rear Default Shock Oil = 35W
To adjust shock absorber damping, disassemble the shocks and change the
pistons or shock oil.
• To get softer damping, use a piston with more holes or use thinner
shock oil.
• To get harder damping, use a piston with less holes or use thicker
shock oil.
IMPORTANT!
After reassembling the shocks, make sure you bleed the shock properly.
A2.2 SETTING THE FRONT SHOCK
ABSORBERS – UPPER MOUNTING
POSITION
Front Shock Default Upper Mounting
Position = 2ND LOWEST HOLE
Attach the front shock upper pivotball to the
2nd lowest hole on the front shock tower.
A2.3 SETTING THE FRONT SHOCK
ABSORBERS – LOWER MOUNTING POSITION
There is only one shock mounting position on the front lower arm.
A2.4 SETTING THE REAR SHOCK
ABSORBERS – UPPER MOUNTING
POSITION
Rear Shock Default Upper Mounting
Position = 2ND LOWEST HOLE
Attach the rear shock upper pivotball to the
2nd lowest hole on the rear shock tower.
A2.5 SETTING THE REAR SHOCK
ABSORBERS – LOWER MOUNTING POSITION
There is only one shock mounting position on the rear lower arm.
A3. TRACK-WIDTH
Track-width is the distance between the outside edges of the wheels, front or
rear. It is important that front and rear track-width is adjusted symmetrically,
meaning that the left and right wheels (at one end of the car) must be the
same distance from the centerline of the chassis.
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Initial Steps
A. Shocks: Attach front and rear shocks.
B. Wheels: Mount all four wheels on the car.
Setup Apparatus
Measure track-width with the car resting on a
at measuring surface, such as the HUDY Flat
Setup Board which has graduated markings to
measure track-width.
A3.1 MEASURING TRACK-WIDTH
Measure front track-width on the outside edges of the front wheels.
Measure rear track-width on the outside edges of the rear wheels.
A3.2 SETTING FRONT TRACK-WIDTH
Front Track-width Default Setting =
199mm
Set the front track-width to 199mm.
(The outer edge of each front wheel should be
99.5mm from the centerline of the chassis.)
Adjust front track-width using the pivotballs in
the front steering blocks:
• To increase front track-width, turn OUT
both upper and lower pivotballs equally.
• To decrease front track-width, turn IN both upper and lower pivotballs
equally.
IMPORTANT!
Make equal adjustments on both left and right sides. Track-width must be
symmetrical on both left and right sides of the car.
Changing front track-width will also affect the front toe setting.
A3.3 SETTING REAR TRACK-WIDTH
Rear Track-width Default Setting =
200mm
Set the rear track-width to 200mm.
(The outer edge of each rear wheel should be
100mm from the centerline of the chassis.)
Adjust rear track-width with the two lower
pivotballs in the rear uprights, and also the
rear upper camber link.
• To increase rear track-width, turn OUT
both pivotballs equally, and lengthen the camber link.
• To decrease rear track-width, turn IN both pivotballs equally, and
shorten the camber link.
IMPORTANT!
Make equal adjustments on both left and right sides. Track-width must be
symmetrical on both left and right sides of the car.
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A4. RIDE HEIGHT
Ride height is the distance between the bottom of the chassis and the
reference surface on which the car is resting. Adjust ride height with the car
ready-to-run but without the body.
Initial Steps
A. Shocks: Connect front and rear shocks.
B. Anti-roll bars: Disconnect front and rear anti-roll bars.
C. Wheels: Mount a set of wheels/tires with diameters of 62mm front /
63mm rear.
Setup Apparatus
Measure ride height with the car resting on
a at reference surface (such as a Flat Setup
Board offered by HUDY).
A4.1 MEASURING RIDE HEIGHT
Measure the ride height from the very end
points at the front and rear of the car, using
calipers or a ride height gauge (such as those
offered by HUDY).
IMPORTANT!
Make equal adjustments on both left and right
sides of the car.
A4.2 SETTING FRONT RIDE HEIGHT
Front Ride Height Default Setting = 6mm
Adjust front ride height by increasing or decreasing the preload on the front
shock springs.
• Increase front ride height by tightening the spring preload collars on
the front shocks (increasing the preload). This moves the collars DOWN
the shock bodies.
• Decrease front ride height by loosening the spring preload collars on
the front shocks (decreasing the preload). This moves the collars UP the
shock bodies.
A4.2 SETTING REAR RIDE HEIGHT
Rear Ride Height Default Setting = 7mm
Adjust rear ride height by increasing or decreasing the preload on the rear
shock springs.
• Increase rear ride height by tightening the spring preload collars on
the rear shocks (increasing the preload). This moves the collars DOWN
the shock bodies.
• Decrease rear ride height by loosening the spring preload collars on
the rear shocks (decreasing the preload). This moves the collars UP the
shock bodies.
A5. CAMBER
Camber is the angle of a wheel to the surface on which the car is resting
(with wheels and shock absorbers mounted) when looked at from the front or
rear of the car.
• Zero degrees (0°) of camber means the wheel is perpendicular to
the reference surface.
• Negative camber means that the top of the wheel is leaning inward
(toward the centerline of the car).
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• Positive camber means that the top of the wheel is leaning outward
(away from the centerline of the car).
Initial Steps
A. Shocks: Connect front and rear shocks.
B. Anti-roll bars: Disconnect front and rear anti-roll bars.
C. Wheels: If measuring camber using a setup system, remove the wheels
and following the instructions included with the setup system. If measuring
camber using a camber gauge, mount the wheels and set the car on a at
reference surface.
Setup Apparatus
Wheels on:
Measure camber using Serpent’s Camber Gauge #1460 and a at reference
surface (such as a Flat Setup Board offered by HUDY).
Wheels off:
Measure camber using a setup system and a at reference surface (such as
those offered by HUDY).
There may be differences in measurements depending on whether you
measure camber using a camber gauge or a setup system. The reason is that
tires (especially the rear tires) have a tendency to lay at on the reference
surface. If this happens (that is, if the tires are not pre-coned), the camber
readings may differ as much as 0.5° from the reading you would get with a
setup system.
A5.1 MEASURING CAMBER
Measure the camber using the camber gauge or setup system. Before
measuring camber, lift and drop the end of the car (front or rear) a few cm’s
to let the suspension settle.
A5.2 SETTING FRONT CAMBER
Front Camber Default Setting = -2°
Set the front camber to –2° (top of front
wheel leaning inward).
Adjust front camber using the upper pivotball
in the front steering block.
• To get more negative camber (more
inclined), turn IN the front upper
pivotball.
• To get less negative camber (more
upright), turn OUT the front upper pivotball.
IMPORTANT!
Make equal adjustments on both left and right sides of the car.
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A5.3 SETTING REAR CAMBER
Rear Camber Default Setting = -3.0°
Set the rear camber to –3.0° (top of rear
wheel leaning inward).
Adjust rear camber using the upper pivotball
in the rear upright.
• To get more negative camber (more
slanted), SHORTEN the rear upper
camber link.
• To get less negative camber (more
upright), LENGTHEN the rear upper camber link.
IMPORTANT!
After you set the camber, re-check the ride height settings. Camber and ride
height settings affect each other, so be sure to check each one when you
adjust the other.
A6. CASTER
Caster is the forward/rearward angle of the front steering block with respect
to a line perpendicular to the ground.
Initial Steps
None
Setup Apparatus
None
A6.1 SETTING FRONT CASTER
Front Caster Default Gap = 3mm
(1+2mm spacers in front of upper arm, 4mm
spacer behind)
Put the 1+2mm spacers in front of the front
upper arm, and the 4mm spacer behind the
front upper arm.
A7. TOE
Toe is the angle of the wheels when looked at from above the car.
• Wheels parallel with the centerline of the car have a 0° toe value.
• Wheels that are open toward the front have a negative toe value
(toe-out).
• Wheels that are closed toward the front have a positive toe value
(toe-in).
Initial Steps
A. Shocks: Connect the front and rear shocks.
B. Wheels: Remove all wheels from the car.
Setup Apparatus
Measure and adjust front and rear toe using a setup system on a at
reference surface (such as those offered by HUDY).
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