Serpent Seven20 Guía del usuario

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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