Losi LOSA3603 User Manual
Team Losi Racing SmartDi Instruction Manual
LOSA3608
LOSA3604
LOSA3518
LOSA3505
LOSB3528
LOSA6948
LOSA3553 (for front diff)
LOSA3554 (for center diff)
LOSA3604
LOSA3518
LOSA3505
LOSA3509 (Front Diff Ring Gear: 8B)
LOSA3511 (Front Diff Ring Gear: 8T
LOSA3555 (Center Spur Gear, Lgwt: 8T)
LOSA3556 (Center Spur Gear, Lgwt: 8B)
LOSA6948
LOSA3553 (for front diff)
LOSA3554 (for center diff)
LOSA3604
LOSA3604
LOSA3604
LOSA3604
LOSA3606
LOSB3528
LOSA3505
LOSA3608
Thank you for purchasing the Team Losi SmartDi! We are condent that the SmartDi will enhance the performance of your
8IGHT Buggy or 8IGHT Truggy. Please take the time to read this manual fully to understand the technical aspects of the SmartDi.
This manual covers the assembly, disassembly, service information and tuning tips for improved racing.
Di Case/Outdrive Assembly
BLACK
GREASE
SmartDi Planetary Gear/Cage Assembly
Braking
Surface
Braking
Surface
Di Final Assembly
Braking
Surface
Tip: Put a
small dab
of SmartDi
grease in each
spring hole
to help hold
the springs in
place during
assembly.
BLACK
GREASE
Page 1
SMARTDIFF
GREASE
SmartDi Maintenance
Team Losi Racing recommends regreasing with SmartDi Grease (LOSA3607) and inspecting your SmartDi periodically to
maintain proper performance. Upon disassembly, please check the following:
1) Locate all springs and check for damage. Replace if necessary.
2) Visually inspect all brake surfaces on the small bevel gears (which the cages clamp down on). Check for excessive wear. The
small bevels and cages should be replaced as a set to maintain proper braking force of the di. The wear rate of the cages and
small bevels depends on spring setup and driving style. If the small bevels start to develop grooves in the braking surface, it is
time for replacement of the small bevel/cage.
3) Be sure to regrease all moving parts and also be sure to grease the outdrive shafts.
4) When reassembling, be sure to check for smooth di operation and gear mesh.
Tuning Tips
Your SmartDi comes with four .15mm wire diameter springs installed. This is a baseline setup that delivers a good balance of turn
in precision, and exit acceleration. Changing spring rates will aect the timing at which the SmartDi starts applying frictional
force to the smaller bevel gears. In essence, the SmartDi acts as though it has lighter viscosity oil when entering a turn, but
then acts as though it has thicker oil on exiting the corner for increased drive. If the spring count is decreased to only two .15mm
springs, the di will not turn in as aggressively, but will drive out of the corner harder. For example, when two .20mm springs
are installed with two .15mm springs, the turn in will be more aggressive, while exit acceleration will not be as aggressive. The
SmartDi comes equipped with 120° ramp plates for a more aggressive on-power drive (90° ramp plates (LOSA3605) are available
for aftermarket use, which will reduce the aggressiveness of the on-power drive).
SmartDi Spring Setup Matrix
SPRING WIRE DIAMETER OFF-POWER TURN IN ON-POWER DRIVE
4 x .15mm (installed) NEUTRAL VERY AGGRESSIVE
4 x .20mm NEUTRAL/AGGRESSIVE AGGRESSIVE
4 x .25mm AGGRESSIVE NEUTRAL/AGGRESSIVE
4 x .35mm VERY AGGRESSIVE NEUTRAL
SmartDi Price List
Part Number Description Retail
LOSA3600 Complete Front SmartDi: 8IGHT 2.0 $99.99
LOSA3601 Complete Center SmartDi: 8IGHT 2.0 $99.99
LOSA3602 Complete Front SmartDi: 8IGHT-T 2.0 $99.99
LOSA3603 Complete Center SmartDi: 8IGHT-T 2.0 $99.99
LOSA3604 Gear and Shaft Set: SmartDi $29.99
LOSA3605 Ramp Plate, 90 Degree: SmartDi $19.99
LOSA3606 Return Spring Assortment: SmartDi $19.99
LOSA3607 SmartDi Grease $5.99
LOSA3608 Ramp Plate, 120 Degree: SmartDi $19.99
LOSA6948 8x14x4 Flanged Rubber Seal BB (4) $17.99
LOSB3528 Heavy Duty Di Case $9.99
Page 2
800-0381
Printed 12/08
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