Upgraded Billet 2 Piece Idler Kit for Land Rover Range Rover Range Rover Sport (2010-2024) 3.0L 5.0L

Heavy-Duty Billet Supercharger Idler Kit for 2010-2024 Land Rover Range Rover & Range Rover Sport (L405, L494, L322, L320)

What it Does: The billet 2-piece supercharger idler kit replaces failure-prone factory plastic pulleys on 2010-2024 Land Rover Range Rover and Range Rover Sport models to eliminate belt slip, bearing runout, and catastrophic belt throw under heavy supercharger load.

The Stock Land Rover Range Rover, Range Rover Sport Pulley Fatigue & Failure

Factory supercharged AJ133 5.0L V8 and AJ126 3.0L V6 engines rely on composite nylon 8-rib idler and tensioner pulleys that struggle under thermal strain. Intense under-hood heat cycles combined with continuous high-RPM supercharger belt tension degrade the stock plastic. Over time, the guide walls distort, leading to belt misalignment, accelerated ribbed belt wear, and premature bearing seizure that can shred the drive belt and leave you stranded.

The Engineering Solution

Engineered for high-stress forced-induction operation, this kit is precision CNC-machined from 6061-T6 billet aluminum to provide rigid structural dimensional stability under full throttle. Each pulley features a hard-anodized surface treatment that resists groove abrasion and prevents belt glaze. Packed with high-temp Japanese Nachi bearings and double contact seals, this 2-piece set prevents dirt intrusion and eliminates flex across the entire accessory drive plane.

What's Included

• 2 x CNC Billet Aluminum Hard-Anodized Supercharger Idler / Tensioner Pulleys (with pre-installed Nachi sealed bearings)

Technical Specifications

Compatibility

• 2010-2024 Land Rover Range Rover 3.0L Supercharged
• 2010-2024 Land Rover Range Rover 5.0L Supercharged
• 2010-2024 Land Rover Range Rover Sport 3.0L Supercharged
• 2010-2024 Land Rover Range Rover Sport 5.0L Supercharged

Frequently Asked Questions & Fitment Warnings

Does this fit the L405 and L494 Range Rover, Range Rover Sport?

Yes, this is a direct fit for the 2010-2024 Land Rover Range Rover and Range Rover Sport equipped with the supercharged AJ133 5.0L or AJ126 3.0L engine. Naturally aspirated and turbocharged inline-six (Ingenium) engines are excluded.

Does this kit include the spring-loaded tensioner housing assembly?

No, this package includes the two replacement billet pulleys only; you reuse your existing factory cast tensioner bracket assembly.

The Land Rover Precision Standard

High-output European luxury powerplants require strict tolerances and durable rotating assemblies. By replacing fragile OEM plastic with billet aluminum and premium Japanese bearings, you preserve drive belt alignment, sustain boost pressure, and prevent catastrophic accessory drive failures on the road or trail.