LOSA3603
MSRP: $99.99
Available for*: $89.99
*at participating retailers

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SmartDiff - The Ultimate Drop-In Hop Up

Losi's SmartDiffs know exactly how to respond to track conditions and throttle input, offering the ultimate combination of precise steering and immediate acceleration when entering and exiting corners and turns.

How the SmartDiff Works

Off Throttle On Throttle

Off-Throttle Action

When entering a corner off the throttle, the SmartDiff automatically opens, via the Smart Diff Springs, allowing the gears to rotate freely for improved off-power steering precision.

On-Throttle Action

When power is applied, the SmartDiff's adjustable ramp plates lock onto the gear shafts for increased acceleration out of corners

Exploded View

Exploded View
  • HEAVY-DUTY LIGHTENED OUTDRIVE
  • FLANGED RUBBER SEAL BALL BEARING
  • HEAVY-DUTY DIFFERENTIAL CASE
  • SmartDiff SUN GEAR
  • 120 DEGREE RAMP PLATE
  • SmartDiff CAGE ASSEMBLY
  • 0.15MM RETURN SPRINGS
  • SmartDiff PLANETARY GEAR ASSEMBLY
  • DIFFERENTIAL SEAL
  • LIGHTWEIGHT 50T CENTER SPUR GEAR

Performance Enhancement For 8IGHT Vehicles

Losi engineers and drivers recommend that you initially start by adding a SmartDiff to the center of your 8IGHT vehicle. Adding a Center SmartDiff to any of the following 8IGHT buggies or 8IGHT-T truggies will noticeably increase your vehicle's off-power steering and on-power acceleration. Adding an additional SmartDiff to the front of your vehicle will provide an even greater amount of off-power steering and on-power acceleration, and will also make it easier to clear long jumps.

SmartDiffs for 8IGHT Truggies
Center SmartDiff (LOSA3603) and Front SmartDiff (LOSA3602)

  • 8IGHT-T 2.0 RACE ROLLER (LOSA0805)8IGHT 2.0 RACE ROLLER (LOSA0805)
  • 8IGHT-T 2.0 RTR (LOSB0085)8IGHT-E 2.0 (LOSB0085)

SmartDiffs are great performance enhancers for the original 8IGHT-T truggies as well.

SmartDiffs for other 8IGHT Models
Center SmartDiff (LOSA3601) and Front SmartDiff (LOSA3603)



Advanced Tuning Options

Spring Setup

Spring Setup

Each SmartDiff includes four sets of SmartDiff Return Springs: 0.15mm (installed), 0.20mm, 0.25mm, and 0.35mm diameter springs. Using a lower spring rate setup (0.15mm) will supply a less aggressive level of steering going into a turn and a very aggressive level of power during exit acceleration. Using a higher spring rate setup (0.35mm) will produce opposite results.


Ramp Plates

Ramp Plates

The SmartDiffs come pre-assembled by the factory with two 120 Degree Ramp Plates installed for a more aggressive on-power drive. 90 Degree Ramp Plates (LOSA3605, sold separately) can be installed in each of the SmartDiffs to reduce the aggressiveness of the on-power drive


SmartDiff Grease and Silicone Differential Fluid

SmartDiff Grease and Silicone Differential Fluid

The SmartDiffs come pre-filled by the factory with SmartDiff Grease, which provides a good, all-around setup. However Silicone Differential Fluid can instead be used to slow down the reaction of the SmartDiff. Losi recommends using 1000wt up to 5000wt silicone fluid. Using a higher viscosity of silicone fluid will have an increased effect on slowing down the actions of the SmartDiff than a lighter viscosity of silicone fluid.