VW DQ381 7speed gearbox - Front Torsen LSD | Gear-type LSD

VW DQ381 7speed gearbox - Front Torsen LSD | Gear-type LSD

Technical Data

Differential type: Gear-type LSD (Torsen / helical gears)

Installation position: Front

Installation torque:

90 Nm

Recommended threadlocker:

Loctite 271 (red)

For maximum security: Loctite 270 / 2701 (green)

Key Benefits of RSX Torsen (Gear-Type) LSDs

No clutches or plates to wear out → completely maintenance-free

Smooth and progressive torque transfer → no sudden locking, predictable handling

Ideal for mixed-use vehicles → daily driving, spirited road use, and track days

Significant lap time improvement
→ Compared to open differentials, RSX Torsen LSDs reduce lap times by ~1 second per kilometer on average, based on extensive testing across:

• Circuit racing
• Tarmac & gravel rally
• Rallycross
• Hill climb
• Track-day applications

Manufacturing Process

Our Torsen (helical gear) LSDs are manufactured from FORGED Nickel-Chromoly steel and treated with advanced processes such as:

Super Sub-Zero / Cryogenic treatment

Shot peening

WPC treatment

These processes significantly increase surface hardness, fatigue strength, and overall durability, making them ideal for high-torque turbocharged engines, including drag racing applications exceeding 1,000 hp.

Our in-house high-angle helical gear design provides exceptional traction and cornering speed, often outperforming some plate-type LSDs available on the market.

The maintenance-free and noise-free operation makes RSX Torsen LSDs an excellent choice for road cars and track-day vehicles, while remaining highly effective and cost-efficient for racing, drag, and rally applications.

Recommended Uses

1. Street Driving

Improved traction, stability, and safety in everyday driving

Particularly effective in rain, snow, and low-grip conditions

Smooth and silent operation with no steering pull, unlike plate-type LSDs

Unnoticeable in daily use while providing a clear safety advantage

2. Track Days & Performance Driving

Consistent torque distribution improves cornering speed

Better acceleration out of corners

Reduced wheel spin under hard acceleration

Ideal balance between daily usability and weekend performance

3. Motorsport Applications

Widely used in circuit racing, time attack, rally, autocross, and drag racing

Helps reduce understeer in FWD cars and oversteer in RWD configurations

Extremely durable and maintenance-free → ideal for endurance racing and one-make series

Low running costs and high reliability under competition use

Warranty

To demonstrate our commitment to quality and reliability, we offer a 5-year motorsport warranty covering material or manufacturing defects across our entire range of Torsen / gear-type LSDs.

Important Reminder – Gear Oil

Use OE or fully synthetic gear oil

Do NOT use LS gear oils (shockproof additives / friction modifiers), as these are only for plate-type LSDs

Pre-lubricate the LSD with gear oil during gearbox assembly

⚠️ Note: Anti-rust oil applied during factory assembly does not provide lubrication.

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