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Serpent Seven20, Setup Manual, Page: 2 / 40

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- 3 -

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

Summary of Contents for Seven20

Page 1: ...SETUP BOOK 1 10TH SCALE 4WD COMPETITION CAR...

Page 2: ...2 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 FRO...

Page 3: ...s 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...

Page 4: ...al 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 l...

Page 5: ...assis 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 bel...

Page 6: ...TION 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 MOU...

Page 7: ...UT 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...

Page 8: ...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...

Page 9: ...s 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 flat on the reference surface If this happens...

Page 10: ...t 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 2...

Page 11: ...HEN each steering rod equally To set more toe out SHORTEN each steering rod equally A7 3 SETTING REAR TOE Rear Toe Default Setting 3 0 toe in Adjust the rear toe in value of each rear wheel to 3 0 fro...

Page 12: ...on the bar or moving the linkage lower pivotball to a different position on suspension arms To set the rear anti roll bar to a softer setting move the linkage upper pivotball outward towards the end...

Page 13: ...rom the front wheel that lifted first and decrease the preload on the rear spring diagonally across from the front wheel that lifted last Adjust both rear springs in equal but opposite directions othe...

Page 14: ...m the rear wheel that lifted last Adjust both front springs in equal but opposite directions otherwise you will change the front ride height Example If the rear right wheel lifts first increase the pr...

Page 15: ...nditions Remember that for the car to work and respond to setup changes properly it must be in good mechanical shape Check for the well functioning of critical areas such as the free movement of the s...

Page 16: ...does not list to one side CENTER OF GRAVITY CG The center of gravity CG of the car is the point on the car in 3 dimensional space around which the car would be in total balance if you could support it...

Page 17: ...of the car RC is usually below the CG in cars ROLL CENTER IN ACTION When the car is cornering centrifugal force is applied to the car s CG which pushes the car to the outside of the corner This causes...

Page 18: ...nsfer at front of car therefore decreases grip Increases car s responsiveness Decreases chassis roll Use in high grip conditions to avoid traction rolling in mid corner and corner exit Better on track...

Page 19: ...h the type of track and or amount of grip available More suspension travel lower downstop value makes the car more responsive but less stable it is also typically better on a bumpy tracks or tracks wi...

Page 20: ...e consequences to altering ride height too much Measure and adjust ride height with the car ready to run but without the body Use the shock preload collars to raise and lower the ride height RIDE HEIG...

Page 21: ...lours are NOT standardized a Serpent red spring will not have the same spring rate as a red spring from another manufacturer Effects of Spring Rate Softer Springs Makes the car feel as if it has incre...

Page 22: ...nd more lateral grip side bite Shocks More Upright Makes the spring and damping harder Makes the car have a more direct feel but less lateral grip SHOCK DAMPING Shock damping manages the resistance of...

Page 23: ...a piston with fewer holes gives harder damping and a shock piston with more holes gives softer damping The shocks in the Serpent 720 have non adjustable pistons however you may disassemble the shock...

Page 24: ...width Wider Decreases front grip Increases understeer Slower steering response Use to avoid traction rolling Narrower Increases front grip Decreases understeer Faster steering response Rear Track widt...

Page 25: ...ng position and altering the length of the rear camber link Adjusting Rear Camber Rise To increase rear camber rise do the following Relocate the inner mounting points of the rear upper camber links t...

Page 26: ...face and the wheels pointed straight ahead Static camber adjustments primarily affect the outside wheels since these are the wheels that bear the majority of the load during cornering The amount of fr...

Page 27: ...in they should never have toe out EFFECTS OF TOE ADJUSTMENT Front Toe Increased more toe in Increases understeer decreases oversteer Decreases steering at corner entry Increases nervousness Makes car...

Page 28: ...he balance of a car Note that chassis stiffness plays a very important role in the effectiveness of anti roll bars and a stiffer chassis makes the car more responsive to anti roll bar changes FRONT AN...

Page 29: ...regularly with a good light bearing oil The ball bearings are subjected to high heat for extended periods and have a tendency to get rusty after a short time which may lead to failure if not oiled Thr...

Page 30: ...only a slight amount of movement detectable The clutch housing should rotate freely End play is adjusted AFTER clutch gap and is done with the clutch fully assembled with all bearings For information...

Page 31: ...Centax 3 Clutch Shoe Yellow Harder material Less clutch slippage Less wear CLUTCH SPRING PRELOAD Clutch spring preload affects the point at which the clutch engages and is altered by tightening or loo...

Page 32: ...may be done without disassembling the transmission TRANSMISSION ADJUSTMENT SHOE GAP The shoe gap determines how smoothly the transmission shifts into 2nd gear and is set by the two small shoe gap scr...

Page 33: ...circle the outer wheel has a larger diameter circle to follow than the inner wheel so it needs to rotate faster to keep up If the differential is too tight the result is that the wheels fight each oth...

Page 34: ...ake a gear differential LIGHTER fill it with thinner oil To make a gear differential HEAVIER fill it with thicker oil EFFECTS OF FRONT GEAR DIFFERENTIAL ADJUSTMENT Lighter Front Differential thinner o...

Page 35: ...adapt the Serpent 720 to varied track conditions using a single screw Drawbacks include the possibility of diff slippage if the internal adjustment screw is not sufficiently tight and also that runni...

Page 36: ...differential action When building the rear ball differential tighten the internal adjustment screw to minimize or eliminate slippage under power The internal adjustment screw squeezes the diff plates...

Page 37: ...n be used with either the standard rear gear differential or the adjustable rear ball differential B18 FRONT SOLID AXLE Optional The optional front one way axle can be very quickly converted into a so...

Page 38: ...ext page is a simple to use setup guide With the car s handling characteristics listed on the left of the table the suggestions for solutions are presented in order of importance and also shows whethe...

Page 39: ...Bar Differential One way Axle Solid Axle 5 6 3 3 5 4 2 6 2 5 7 2 5 6 3 4 7 3 2 6 2 4 7 2 2 6 2 5 7 2 6 6 5 2 5 4 3 5 4 2 3 3 3 7 5 3 2 4 2 2 3 5 4 2 3 3 3 7 5 3 2 4 2 2 7 5 3 2 4 2 2 5 5 2 1 4 3 3 2 2...

Page 40: ...Serpent Model Racing Cars BV Spaarneweg 12E 2142 EN Cruquius The Netherlands Europe 803103 Version 1...

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