Description
Introducing the TOMEI TECHNICAL TRAX ADVANCE LSD for the Nissan Z 400Z / RZ34
The new Nissan Z / Fairlady Z (400Z / RZ34) is an FR sports car with extremely high performance potential. However, to truly bring out its power and the enjoyment of rear-wheel drive, the performance of the rear differential is extremely important. The TOMEI TECHNICAL TRAX ADVANCE LSD is a serious mechanical LSD developed to further enhance the 400Z / RZ34’s traction performance, cornering stability, and rear-wheel-drive control.
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400Z / RZ34 OEM LSD Specifications
| US Grade | OEM LSD | Key Point |
| Sport RWD | Open | Open differential specification. Vehicles used for sports driving or lowered suspension setups may experience traction limitations. |
| Performance RWD | Mechanical | Equipped with a OEM mechanical LSD. However, the OEM unit is tuned for mild operation. |
| Heritage Edition RWD | Mechanical | Equipped with a OEM mechanical LSD. An upgraded LSD is effective for stronger locking performance and sports driving. |
| NISMO RWD | Mechanical | Equipped with a OEM mechanical LSD. Circuit driving and drifting require even stronger locking performance. |
Why Does the 400Z / RZ34 Need an Upgraded LSD?
For drivers who truly want to enjoy the performance of the 400Z / RZ34, upgrading the LSD is an extremely important tuning item. Especially on Sport grade vehicles that are not equipped with an OEM LSD, driving force cannot be efficiently distributed to both rear tires during acceleration or corner exit, and one rear tire may spin. This prevents the vehicle from fully transferring its power to the road surface, leading to reduced traction and unstable vehicle behavior.
On the other hand, Performance, Heritage Edition, and NISMO models are equipped with an OEM mechanical LSD, but the OEM LSD has mild characteristics that prioritize daily drivability and quiet operation. For drivers who want sharper rear-end control during sports driving, circuit use, drifting, or winding roads, stronger locking performance and improved response are required.
The TOMEI TECHNICAL TRAX ADVANCE LSD increases rear grip during corner exit and firmly transfers driving force to both rear tires, greatly improving acceleration performance, straight-line stability, and rear contact feel. It brings out the true enjoyment of an FR sports car, including improved lap times on the circuit, better control during drifting, and greater confidence on winding roads.
To unlock the true potential of the 400Z / RZ34, a LSD is truly an essential drivetrain tuning item.
Features of the TOMEI TECHNICAL TRAX ADVANCE LSD
・Strong locking performance with a high-capacity clutch disc structure
・Designed to maximize rear traction performance for FR sports cars
・Improved driving force transfer during corner exit
・Effective for improving lap times during circuit driving
・Improved rear control during drifting
・Direct FR driving feel that can also be enjoyed on the street
TOMEI TECHNICAL TRAX ADVANCE LSD does not have the mild operating feel of an OEM LSD. Instead, it has more aggressive characteristics suited for sports driving. Therefore, operating noise and tire dragging may occur during low-speed turns or in parking lots. However, this is proof of a true mechanical LSD, and it transforms the 400Z / RZ34 driving experience into something more direct and enjoyable.
Comparison between TOMEI TECHNICAL TRAX ADVANCE LSD and the OEM LSD
Casing
The TOMEI LSD uses a fully machined case, while the OEM LSD uses a case structure made by machining a cast material. This fully machined construction allows the TOMEI LSD to secure more internal space for additional clutch discs while achieving both high case strength and weight reduction.
Disc
For both the external-teeth and internal-teeth types, the TOMEI LSD uses larger-diameter discs with a greater effective friction area compared to the OEM LSD. This increases the total friction surface area, allowing the LSD to generate stronger lock-up force.
â– external-teeth
â– external-teeth
Pressure Ring
For both the external-teeth and internal-teeth types, the TOMEI LSD uses larger-diameter discs with a greater effective friction area compared to the OEM LSD. This increases the total friction surface area, allowing the LSD to generate stronger lock-up force.
Internal parts
The TOMEI LSD uses 12 discs per side, for a total of 24 discs, while the OEM LSD uses 5 discs per side, for a total of 10 discs. By increasing the number of discs, the TOMEI LSD provides a greater friction surface area, delivering stronger lock-up force, improved disc wear resistance, and more stable LSD operation.
Parts configuration
Choosing Between 1.5WAY and 2WAY
| Type | Characteristics | Recommended Use |
| 1.5WAY | Emphasizes locking performance under acceleration while being easier to control during deceleration than a 2WAY. | Street driving, winding roads, circuit driving, grip driving |
| 2WAY | Strong operation during both acceleration and deceleration, allowing the driver to actively control rear vehicle posture. | Drifting, circuit driving, aggressive sports driving |
PRO KIT: Model Including 3.9 Final Drive Gear Set
In addition to the standalone LSD units, the PRO KIT, which includes a 3.9 final drive gear set, will also be released at the same time.
The OEM final drive ratio for the 400Z / RZ34 6MT is 3.538. This is a mild setting that takes highway cruising, fuel economy, and noise into consideration. With the PRO KIT, changing the final drive to 3.916 creates a shorter gear ratio, greatly improving acceleration feel and shift feel. The connection between 2nd and 3rd gear becomes more responsive, allowing drivers to enjoy a more sports-car-like feeling both on the street and on the circuit.
| Specification | Final Drive Ratio | Characteristics |
| Factory | 3.538 | Mild setting focused on highway cruising and fuel economy. |
| TOMEI PRO KIT | 3.916 | Approximately 10% shorter gearing. Improved acceleration feel, response, and shifting enjoyment. |
6MT Gear Ratios
| Gear | 1st | 2nd | 3rd | 4th | 5th | 6th |
| Nissan OEM 6MT Gear Ratio | 3.530 | 2.324 | 1.624 | 1.271 | 1.000 | 0.794 |
6MT Gear Ratios
| Specification | Approx. RPM at 100 km/h Cruising |
6th Gear at 7000 rpm | Characteristics |
| OEM 3.538 | Approx. 2200 rpm |
Approx. 318.6 km/h | Suitable for highway cruising. Calm gear ratio. |
| TOMEI 3.916 | Approx. 2430 rpm |
Approx. 288.0 km/h | Acceleration-focused. 2nd and 3rd gears become more enjoyable. |
6MT Gear Ratios
The 400Z / RZ34 is a highly refined modern sports car, but in factory form, it has a mild setup that emphasizes comfort and ease of use. The TOMEI TECHNICAL TRAX ADVANCE LSD gives the 400Z / RZ34 the direct drivetrain feel, rear stability, and active controllability expected from a true FR sports car. Furthermore, the PRO KIT improves acceleration feel and shift feel with the 3.9 final drive gear. By installing the LSD and final drive gear together, the 400Z / RZ34 becomes more aggressive and more enjoyable to drive. For those who truly want to enjoy the 400Z / RZ34, the TOMEI TECHNICAL TRAX ADVANCE LSD is a highly recommended upgrade.
Important Notice:
This product is a mechanical LSD designed with a focus on sports driving. Operating noise, chattering, and tire dragging may occur during low-speed turns or parking. It may not be suitable for customers who prioritize quietness or factory-like mild driving characteristics.
