The High Speed Engineering Nissan SR20DET NCVS S14/S15 Billet Oil Pump Gear Upgrade Kit is a premium-strength solution engineered to replace the weak factory sintered gears found in later-model SR20DET engines. Designed for performance street builds, drift cars, and high-power applications, this kit dramatically increases oil pump reliability by using precision CNC-machined EN26 billet steel gears.

This billet internal gear set is a direct-fit upgrade for the S14 and S15 oil pump housing and is essential for any SR engine that regularly sees high RPM, hard limiter use, or significant power increases.

Compatibility:

• Suitable for Nissan SR20DET S14 (RWD)
• Suitable for Nissan SR20DET S15 (RWD)
• Direct fit into the S14/S15 OEM oil pump housing
• Ideal for high-revving, high-boost, and forged-engine builds

Key Features:

• EN26 Billet Steel Gears: Replaces the fragile OEM sintered gears with high-strength billet steel for unparalleled durability.
• Precision CNC Machined: Produces perfect tooth geometry, improved meshing, and stable oil pressure at all engine speeds.
• High-RPM Safe: Engineered to withstand demanding competition environments and extended high-rev operation.
• Direct OEM Replacement: Installs directly into the factory oil pump without requiring external modification.
• Enhanced Flow Stability: Stronger gears maintain consistent oil delivery under load, protecting engine bearings and valvetrain components.
• Motorsport Ready: Suitable for drift, time attack, drag, circuit racing, and high-performance street cars.

Why Upgrade S14/S15 SR20DET Oil Pump Gears?

• OEM S14/S15 gears are sintered and are prone to cracking or shattering at high RPM.
• Oil pressure instability is common on modified SRs using factory pump internals.
• Billet gears eliminate these weaknesses and offer a huge reliability increase.
• Ideal for engines revving beyond factory limits or producing substantially more power.

The High Speed Engineering SR20DET S14/S15 Billet Oil Pump Gear Upgrade Kit provides a significant improvement in strength, reliability, and long-term engine protection. For any serious SR build, this is one of the most valuable upgrades you can install.

Notes

• It is the engine builders responsibility to ensure that all components are clean, undamaged and free running BEFORE and AFTER installation.
• Gears must be assembled initially with clean engine oil or assembly grease. Do NOT run dry!
• With the inner and outer gear sitting in front of you and the nose/seal diameter facing toward you, the outer gear should be laid over the inner gear with the “wave” profile in a clockwise orientation. The 2 wave “points” should be facing in the same direction (see assembly instructions).
• These gears are direct replacements for standard gears. If something doesn’t fit easily, then something isn’t right. You should not have to modify the housing and once installed, the gears should spin freely, with no restriction other than the oil seal.