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FREEWARE GEAR RATIO PROGRAM

Download Gear Ratio Program

Some Setup Tips for the Losi XX

These tips are a summary of tips i have found on american web - sides and some added comments of me.

• 20 - 35 oil, green springs, 3 mm limiter in shock ( B spacer)
• Shock mounted hole 2 or 3 from inside on tower, middle hole in the arm
• Upper suspension arm hole 2 or 3 from inside, No toe-in or out 1 degree neg camber, 25 degree caster blocks
• Instead you can try this: Shock mounted in the outer hole of the arm, no limiter, orange springs

Rear Axle

• 30 - 40 oil, pink springs or yellow springs on extrem slippery surface, B - spacer inside and outside shock or outside two A spacers
• Shock mounted hole 2 or 3 from inside on tower, hole 4 in the arme *Hole 4: This hole is not standard. Remove brace from arm then drill a hole 4 mm out from standard outside hole 3
• The upper suspension arm should be mounted inside in hole 6 and outside in hole 4
• Pivot support #2 on smooth tracks and #4 on bumpy tracks, 3.5 rear hub, 1 degree negativ camber

General

• Front arms and rear dogbones level
• The Battery could be placed back ( more acceleration - grip, good for slippery surface ). Place the spacer from the rear to the front
• Tires front: Wide bodies (gold) Rear: IFMAR pins (silver) on hard loam with some dust, IFMAR Stud ( silver ) on hard loam without dust, Step Pin ( gold ) on loose ground or grass
• I drive motors from 14 to 12 Turns. For the gear ratio i have found the following rule of thumb: Less grip longer gear ratio. ( for example: 1:8 is a longer gear ratio then 1:11 ). Check out a 12 turns motor with 1:9 gear ratio. This would be fast on the straights and you have enough punch for acceleration. The Current - limiter on the speed - controller is not much important. I set the limit to 70 Ampere. I set the Hydra-Clutch, so that if you press down the rear axle the Hydra-Clutch and the wheels spin.

1 x CAD and CNC produced graphite chassis two different wheelsbases are possible: original and long wheelbase ( 1,2 cm longer then standard for a smooth drive on bumpy tracks or jumps ) 9 batterie slots for 6 possible batterie positions ( best handling on the front position ) holes for servo fixing PS 1001, 1002 etc. stressvector optimized design for highest stiffness and lowest weight 1 x CNC drilled upper graphite chassis plate for long wheelbase 2 x graphite battery plates with screws and nuts 1 x long rear special - drivebelt for long wheelbase and best efficiency

$ 199,--

graphite front shock tower lowest airdrag and progressive suspension due to inclined shock position

$ 25,--

graphite rear shock tower lowest airdrag and progressive suspension due to inclined shock position and holes for the best wing mount from Kyosho part no.UMW 1

$29,--

Most R/C-Models have the possibilty of some fixing points for the shock in the arm and shock tower.

What does this change ?
• Maximum Ride Height
• Overall Arm (Wheel) Movement
• Wheel - Shock - Way - Constant
This Constant is a kind of ratio between wheel movement and shock movement. The bigger the Wheel - Shock - Way - Constant, the harder is the spring and shock(oil) setup
• Progressivity
A progressive setup means a increasing Wheel - Shock - Way - Constant , that means the more the wheel and arm is pressed down, the harder becomes the spring and shock(oil) setup.

This was calculated by me ( sinus, cosinus ). The following image includes a summary of this effects.

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