Traxxas 67086-1 User Manual download pdf (Page 25)

STAMPEDE 4x4 VXL

•

ADVANCED TUNING ADJUSTMENTS

CAMBER GAIN

Your model has provisions for adjusting the camber gain geometry of the

front and rear suspension. “Camber gain” refers to an increase in camber

angle as the suspension is compressed. The camber gain of the vehicle

can be changed by moving the camber link attachment to a different

horizontal mounting position. Adjusting the camber gain will alter the tire

contact patch as the suspension is compressed. Making the camber link

shorter will increase the camber gain. This makes the vehicle more stable

over bumps, but reduces traction on smooth surfaces. Lengthening the

camber links has the opposite effect.

• Front Camber Gain

To increase the camber gain on the front

suspension,

move the inner camber link

ends out to Position 3. Position 4 is the stock

setting.

•

Rear Camber Gain

To increase the camber gain on the rear

suspension,

move the inner camber link

ends out to a different attachment hole

(Position 1 or 2 in the image. Position 3 is

the stock setting).

Once you make adjustments to the camber gain, you may need to

re-adjust the static camber to suit your tuning needs.

ROLL CENTER

Your model has provisions for adjusting the roll center geometry of the

front and rear suspension. Roll center refers to the virtual axis around

which the chassis will roll when subjected to cornering forces. The roll

center of the vehicle can be raised by mounting the inner ends of the

camber links in a lower position. Raising the roll center will effectively

increase the roll stiffness of the vehicle (similar to installing swaybars).

Adding roll resistance to one end of the vehicle will tend to add traction

to the opposite end. For example, increasing roll resistance in the rear will

provide more traction for the front wheels and potentially more steering.

Raising the roll center on the front and rear equally will increase overall

roll resistance without changing the handling balance. The default factory

locations are designed to make the truck easier and more forgiving to

drive and less likely to traction roll in turns.

• Front Roll Center

To lower the roll center on the

front

suspension, move the

inner camber link ends up to

a different attachment hole

(Position 1 or 2. Position 4 is

the stock setting). To lower the roll center further, move the outer camber

link ends to the lower position on the C-hub.

Bump steer correction - “Bump steer” refers to

unwanted steering inputs caused by suspension

movement. Your model’s suspension geometry is

designed to minimize bump steer. If you are using the

upper hole on the C-hub (image A) and either of the

two lower holes on the shock tower

(positions 3 or 4 in “Front” image), the

tie rod ball should be oriented with the

large flat end on top (stock position

- image B). When using any other

combination of camber link attachment

points, the tie rod ball should be oriented

with the large flat end on the bottom (C).

• Rear Roll Center

To raise the roll center on the rear

suspension, relocate the inner camber links

to one of the two holes (position 4 or 5 in

image) in the lower row of the rear camber link attachment, located

near the base of the rear shock tower.

Once you make adjustments to the roll center, you may need to re-adjust

the static camber to suit your tuning needs.

GEARING

One of the more signiﬁcant advantages to your model’s transmission

is the extremely wide range of available gear ratios. Changing the

gearing allows you to ﬁne tune the speed of the model and control

the temperatures of the battery pack and motor. Use a lower gear

ratio (numerically larger) to reduce current draw and temperatures.

Use a higher gear (numerically lower) to increase top speed. Use the

following formula to calculate the overall ratio for combinations not

listed on the gear chart:

Front

C-hub

Rear

B C

# Spur Gear Teeth

x 2.85 = Final Gear Ratio

# Pinion Gear Teeth

Gearing Compatibility Chart:

The chart below shows

recommended gear combination

ranges for your model.

Spur Gear

Pinion Gear

50 52 54

- 16.44 17.08

- 14.80 15.37

12.94 13.45 13.97

11.86 12.33 12.81

10.95 11.38 11.82

10.16 10.57 10.98

9.49 9.87 10.25

8.89 9.25 9.61

8.37 8.71 9.04

7.91 8.22 8.54

7.49 7.79 8.09

7.12 7.40 7.68

6.78 7.05 7.32

6.47 6.73 -

6.19 6.43 -

5.93 - -

5.69 - -

- - -

Thick black border indicates stock settings.

Out of box setup, recommended for most

running, 6 or 7-cell NiMH, 2S LiPo

Included optional gearing, for high-speed

running only

High speed running (7-cell NiMH or 2S LiPo)

on smooth hard surfaces.

For aftermarket 540 motors; center shaft

cover removed or modiﬁed

Preferred gearing for off-road and extreme

terrain driving.

Fits, for high-speed runs only, not

recommended for use with NiMH batteries.

High-current LiPo batteries required.

Does not ﬁt

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Traxxas 67086-1 User Manual Page 25

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