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Serpent Seven20, Руководство по установке, Страница: 35 / 40

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Heavier Rear Differential

(thicker oil)

 

• Increases on-throttle steering

 

• Better acceleration if the grip is there

 

• More predictable car (cars with very “loose” diffs have a tendency to  

 

  understeer heavily under throttle and turn-in oversteer as soon as you  

 

  lift)

 

• More on-throttle oversteer (snap-oversteer)

 

• More turn-in understeer

 

• More stable under braking 

B15. FRONT BALL DIFFERENTIAL 

(Optional)

The optional front ball differential (#802370) differential action can be 

adjusted externally with a single screw, enabling quick changes to the 

steering characteristic and overall behavior of the car.

Using the front differential combines 

some of the braking advantages of a 

solid front axle while allowing inner/

outer wheel speed difference. This last 

adjustment depends on how much 

friction is applied with the external 

friction collar.

The front differential is most commonly 

used in low grip conditions. It can 

improve on-power corner entry as 

well as braking. The front differential 

is most commonly used with a rear 

differential.

The advantage of using a front ball differential is that it can be quickly 

adjusted to 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 running an 

excessively loose diff action (when slippage is tight) will result in front end 

looseness if one wheel starts spinning.

ADJUSTING THE FRONT BALL DIFFERENTIAL

Gear slippage

 is set independently of differential action.  When building the 

front ball differential, tighten the internal adjustment screw to minimize or 

eliminate slippage under power.  The internal adjustment screw squeezes the 

diff plates against the diff balls, putting lateral force on them. Make sure the 

differential does not slip under power, since this will cause power loss and 

excessive wear. However, do not tighten the differential too much as it will 

damage the diff balls and plates.

Differential action

 is set via an external adjustment screw in the external 

friction collar. Use the diff friction collar to adjust the amount of friction.  

Tighten the adjustment screw to tighten the diff; loosen the adjustment 

screw to loosen the diff.

 

EFFECTS OF FRONT BALL DIFFERENTIAL ADJUSTMENT

Looser Front Diff Action 

(looser friction collar)

 

• Increases steering

 

• Decreases stability under braking but better turn-in

 

• Understeer on-power at corner exit

Содержание Seven20

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

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