TOMEI Technical Trax Advance 1.5-Way LSD – 2013-2016 Scion FR-S / 2013-2020 Subaru BRZ / Toyota 86 & GT86

The TOMEI Technical Trax Advance 1.5-Way LSD is a clutch-type limited slip differential designed to improve traction, stability, and driver control in the Toyota 86, Scion FR-S, and Subaru BRZ platform. Built around TOMEI’s Advance Disc technology, this LSD offers smoother operation, improved transmission efficiency, and more predictable behavior on and off throttle.

Compared to more aggressive 2-way differentials, a 1.5-way LSD offers strong lock under acceleration with reduced locking effect on deceleration, making it a great choice for spirited street driving, autocross, track days, and drivers who want added traction without overly aggressive corner-entry behavior.

Key Features

• 1.5-Way Operation: Strong locking action under acceleration with milder lock on deceleration for a more balanced driving feel.
• Clutch-Type LSD: Uses multiple friction discs to generate consistent, predictable lockup.
• Advance Disc Technology: Designed for quieter operation, smoother engagement, and improved transmission efficiency.
• Large Friction Surface Area: Maximizes torque transfer and traction for performance driving.
• Up to 24 Friction Discs: Helps deliver more uniform torque transmission and improved control.
• Durable LSD Case: Designed to withstand high loads, high initial torque, and repeated severe driving conditions.
• Factory Side Flange Compatibility: T-TRAX Advance design may allow use of original factory side flanges depending on application.

Why We Like It

A proper LSD completely changes how the 86/BRZ chassis puts power down. The TOMEI Technical Trax Advance 1.5-Way is especially appealing because it offers serious traction improvement while staying more street-friendly than a full 2-way setup. It is a great choice for drivers who want better corner exit grip, more predictable rear-end behavior, and improved confidence without making the car too aggressive during braking and turn-in.

Advance Disc Technology

TOMEI’s Advance Disc design uses an improved friction surface finish to create smoother transitions when the LSD engages and disengages. This helps reduce the loud crackling or harsh chatter commonly associated with clutch-type LSDs, making the unit more comfortable for street-driven cars while still delivering performance-focused lockup.

1.5-Way LSD Behavior

A 1.5-way LSD locks strongly under acceleration and provides a reduced locking effect under deceleration. This makes it easier to put power down on corner exit while keeping the car more manageable and stable during braking and corner entry compared to a more aggressive 2-way differential.

Confirmed Fitment

• Scion FR-S
• Toyota 86 / GT86
• Subaru BRZ

Specifications

• Brand: TOMEI
• Product: Technical Trax Advance LSD
• Model / Code: TG1
• Differential Type: Clutch-type limited slip differential
• Operation: 1.5-way
• Application: Toyota/Subaru 86 / FR-S / BRZ
• Use Case: Street, autocross, track, spirited driving

Oil & Break-In Notes

• Kit includes 2 liters of TOMEI Hypoid Gear LSD Oil (GL-5 80W-90).
• TOMEI Technical Trax LSD oil must be used with this LSD unit.
• Using another brand or grade of oil may increase chatter and wear.
• After initial break-in, the LSD may require inspection or adjustment depending on vehicle use and oil condition.

Installation Notes

• Professional installation is strongly recommended.
• Proper backlash, preload, contact pattern, and break-in procedure are critical.
• Some LSD chatter is normal with clutch-type limited slip differentials.
• Practice in a safe environment after installation to get used to the new differential behavior.

What’s in the Box

• (1) TOMEI Technical Trax Advance 1.5-Way LSD unit
• 2 liters of TOMEI Hypoid Gear LSD Oil (GL-5 80W-90)
• Included components per TOMEI kit contents

Compatibility & Disclaimers

Designed for compatible Toyota 86, Scion FR-S, and Subaru BRZ applications. Clutch-type LSDs may introduce additional noise, chatter, or driveline feedback depending on setup, oil choice, break-in, and driving conditions. Always verify final fitment and installation requirements before purchase.