Serpent 710 Guide de l'utilisateur
Setup Book
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CONTENTS
INTRODUCTION 3
SECTION A - BASIC SETUP 4
A1. DOWNSTOPS 4
A2. SHOCK ABSORBERS 5
A3. TRACK WIDTH 7
A4. RIDE HEIGHT 8
A5. CAMBER 9
A6. CASTER 10
A7. TOE 10
A8. ANTI-ROLL BARS 11
A9. SUSPENSION TWEAK 12
A10. REAR DIFFERENTIAL 14
SECTION B - ADVANCED SETUP 15
B1. ROLL CENTER 15
B2. DOWNSTOPS 18
B3. SHOCK ABSORBERS 18
B4. TRACK WIDTH 22
B5. RIDE HEIGHT 22
B6. CAMBER 23
B7. CASTER 24
B8. TOE 24
B9. UPSTOPS 26
B10. ANTI-ROLL BARS 26
B11. FRONT and REAR AXLES 28
B12. FRONT ONE-WAY AXLE 28
B13. SOLID FRONT AXLE (optional) 29
B14. FRONT BALL DIFFERENTIAL (optional) 29
B15. REAR DIFFERENTIAL 30
B16. REAR SOLID AXLE (optional) 31
QUICK REFERENCE 32
DEFAULT SETUP SHEET 34
All texts and images contained within this booklet are copyright of Serpent MRC ©2004
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INTRODUCTION
Setting up a racecar with fully independent suspension, like your
Serpent 710, 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 710.
• Section B: Advanced Setup - describes the effects of setup
changes.
Setup Order
We have determined that you should set up your 710 in the order
indicated in the table below. The order of the settings has been
determined as the most logical to set up your 710 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 setting.
For example, to set the car’s camber:
• attach the shocks
• detach the anti-roll bars
• attach the wheels
• use a at board
Downstops +
+
+
++
+
+
-/+
-/+
-/+
(-/+)
+
-
(-)
-
-
-
+
+
+
(+)
+ + +
+
+ +
attach or use this component or apparatus
DO NOT attach or use this component or apparatus.
component or apparatus may or may not be attached or used.
Anti-roll
bars WheelsShocks Set-up
System Flat Board
Shock Absorbers
Track-Width
Ride Height
Camber
Caster
Toe
Anti-Roll Bars
Suspension Tweak
Rear Differential
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SECTION A - BASIC SETUP
This section describes the default settings for the 710. 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 wishbones travel downward (which
determines how far upwards the chassis travels). Make sure you adjust
downstops so they are equal on both left and right sides.
Initial steps
A Shocks: It is not necessary to remove the shocks, however you must
be sure that 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.
B Front anti-roll bar: Loosen the setscrew from the front anti-roll bar
mounts and push the blades apart so that they are not touching.
C Rear anti-roll bar: Disconnect one ball-joint from the rear anti-roll bar.
D Wheels: Remove the wheels from the car.
Set-up apparatus
Check downstops with the chassis elevated above a reference surface. A
special, at reference board is available from HUDY (#108200 Flat Set-
up Board). We also advise you to use the downstop measuring set from
HUDY.
Measuring downstops
Using the measuring gauge, measure the
distance from the reference surface to the
bottoms of the front steering blocks / rear
uprights. Positive numbers indicate the
distance (in mm) ABOVE the level of the
elevating blocks (or, above the bottom of
the chassis). Negative numbers indicate
the distance (in mm) BELOW the level of
the elevating blocks (or, below the bottom
of the chassis).
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A1.1 Setting front downstops
Front downstop setting = 0mm
Set the front downstops so that the
bottoms of the steering blocks are at 0mm
on the gauge. (Actual measurement =
0mm above level of elevating blocks, or
level with the bottom of the chassis).
Adjust front downstops by turning the
front downstop setscrews in or out. Turn
the front setscrews IN to increase the front
downstop value. Turn the front setscrews OUT to decrease the front
downstop value. Make sure you adjust front downstops so they are
equal on both left and right sides.
A1.2 Setting rear downstops
Rear downstop setting = 7mm
Set the rear downstop screws so that the
bottoms of the rear uprights are at 7mm
on the gauge. (Actual measurement =
7mm above level of elevating blocks, or
above the bottom of the chassis).
Adjust rear downstops by turning the rear
downstop screws in or out. Turn the rear
setscrews IN to increase the rear downstop
value. Turn the rear setscrews OUT to decrease the rear downstop
value. Make sure you adjust rear downstops so they are equal on both
left and right sides.
A2. SHOCK ABSORBERS
Shocks, or shock absorbers, are a part of the suspension that allow the
wheels to keep as much contact with the running surface as possible.
The 710 features unique 4-step externally-adjustable racing shocks
that do not require you to change pistons or change shock oil to alter
the damping. Damping, mounting position, spring tension, and spring
preload are all characteristics that determine how the shock performs.
Initial steps
A Shocks: To adjust shock damping, remove the lower shock ball-joint
from the lower suspension arm. You do not need to disconnect the
shocks to adjust spring preload.
Set-up apparatus
None
Adjusting the shock absorbers
Pull out the piston rod and turn it slightly until it locks in the shock body.
Turning the piston rod fully CW aligns 2 piston holes (hardest setting);
turning the piston rod fully CCW aligns 5 piston holes (softest setting).
There are four positions (2-3-4-5 holes aligned), each of which can be
felt by a slight “click” when you turn the piston rod.
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A2.1 Setting the front shock absorbers
- damping
Front shock damping setting= 3 holes open
Adjust the front shocks to 3 holes open.
Turn completely CW, then turn 1 click CCW.
A2.2 Setting the rear shock absorbers
- damping
Rear shock damping setting= 3 holes open
Adjust the rear shocks to 3 holes open.
Turn completely CW, then turn 1 click CCW.
A2.3 Setting the front shock absorbers
– upper mounting position
Front shock upper mounting position =
second hole
Attach the front shock upper mount to the
hole that is 1 hole above the bottom hole
on the front shock tower.
A2.4 Setting the front shock absorbers
– lower mounting position
There is only one shock mounting position
on the front lower arm.
A2.5 Setting the rear shock absorbers
– upper mounting position
Rear shock upper mounting position =
bottom hole
Attach the rear shock upper mount to the
bottom hole on the rear shock tower.
A2.6 Setting the rear shock absorbers
– lower mounting position
Rear shock lower mounting position =
outer hole
Attach the rear shock lower mount to the
outer hole on the rear lower arm.
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A3. TRACK-WIDTH
Track-width is the distance between the outside edges of the wheels,
front or rear. It is important that front or rear track-width is adjusted
symmetrically, meaning that the left and right wheels must be the same
distance from the centerline of the chassis.
Initial steps
A Shocks: Attach front and rear shocks.
B Wheels: Mount all four wheels on the car.
Set-up apparatus
Place the car on a at measuring surface. We recommend using a HUDY
Set-Up Flat Board, which has graduated markings to measure track-
width.
Measuring track-width
Measure front track-width on the outside edges of the front wheels. It is
important that front track-width is adjusted symmetrically, meaning that
the left and right wheels must be the same distance from the centerline
of the chassis.
Measure rear track-width on the outside edges of the rear wheels. As
with front track-width, it is important that rear track-width is adjusted
symmetrically, meaning that the left and right wheels must be the same
distance from the centerline of the chassis.
A3.1 Setting front track-width
Front track-width setting = 200mm
Set the front track-width to 200mm; the
outer edge of each front wheel should be
100mm from the centerline of the chassis.
To increase front track-width, turn OUT
both upper and lower pivotballs equally. To
decrease front track-width, turn IN both
pivotballs equally.
Note that changing front track-width will also
affect the front toe-in setting.
A3.2 Setting rear track-width
Rear track-width 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.
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To increase rear track-width, turn OUT the
rear upper pivotball AND both rear lower
pivotballs. To decrease rear track-width,
turn IN the rear upper pivotball AND both
rear lower pivotballs; do this equally for
both right and left sides.
A4. RIDE HEIGHT
Ride height is the distance between the bottom of the chassis and the
reference surface on which the car is sitting. 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 /
62mm rear.
Set-up apparatus
Measure ride height with the car sitting on
a at reference surface (such as a HUDY
setup board).
Measuring ride height
Measure the ride height using a HUDY ride
height gauge or calipers from the very end
points at the front and rear of the car.
A4.1 Setting front ride height
Front ride height setting = 6mm
Set the front ride height to 6mm.
Increase the front ride height by tightening
the shock preload collars on the front
shocks. This moves the collars DOWN the
shock body.
Decrease the front ride height by loosening
the shock preload collars on the front
shocks. This moves the collars UP the
shock body.
Make sure you change the shock preload on both front shocks equally.
A4.2 Setting rear ride height
Rear ride height setting = 6mm
Set the rear ride height to 6mm.
Increase the rear ride height by tightening the shock preload collars on
the rear shocks. This moves the collars DOWN the shock body.
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Decrease the rear ride height by loosening
the shock preload collars on the rear
shocks. This moves the collars UP the
shock body.
Make sure you change the shock preload
on both rear shocks equally.
A5. CAMBER
Camber is the angle of a wheel to the surface on which the car is resting
(with wheels and shock absorbers mounted). Zero degrees (0°) of
camber means that the wheel is perpendicular to the reference surface.
Negative camber means that the top of the wheel is leaning inwards
towards the centerline of the car. Positive camber means that the top of
the wheel is leaning outwards from the centerline of the car.
Camber affects the car’s traction.
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 set-up system, remove the
wheels. If measuring camber with the car sitting on a at surface,
mount the wheels.
Set-up apparatus
Measure the camber using Serpents camber gauge #1460.
Note: You can measure camber using the HUDY Set-Up System (on
a at reference surface), but you may get slightly different camber
readings than those from using Serpent camber gauge. The reason is
that tires (especially the rear tires) have a tendency to lay at on the
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 the HUDY Set-Up System.
Measuring camber
Measure the camber using the Serpent
camber gauge. Before measuring camber,
lift and drop the end of the car (front or
rear) a few cm’s to let the suspension
settle.
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A5.1 Setting front camber
Front camber setting = -1.5°
Set the front camber to –1.5° (tops of
front wheels leaning inwards).
Adjust front camber by turning the front
upper pivotball in or out. To get more
negative camber, turn the front upper
pivotball IN. To get less negative camber,
turn the front upper pivotball OUT.
A5.2 Setting rear camber
Rear camber setting = -3.0°
Set the rear camber to –3.0° (tops of rear
wheels leaning inwards).
Adjust rear camber by turning the rear
upper pivotball in or out. To get more
negative camber, turn the rear upper
pivotball IN. To get less negative camber,
turn the rear upper pivotball OUT.
STOP!
After you set the camber, recheck 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 angle of an imaginary line between the top pivotball and
the bottom pivotball of the front steering block, with respect to a line
perpendicular to the ground.
Initial steps
None
Set-up apparatus
None
A6.1 Setting front caster
Set the front caster gap to 3mm (2+1mm
spacers in front of the upper wishbone,
4mm spacer behind).
A7. TOE
Toe is the angle of the wheels when looked at from above the car.
When the wheels are parallel with the centerline of the car, toe is 0°.
When the wheels are open towards the front, this is called toe-out
(negative value). When the wheels are closed towards the front, this is
called toe-in (positive value).
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