Boundary Racing Pumps Oil Pump Gear - OEM 81mm Housing / MWT Treatment For Nissan Skyline R32 R33 R34 GTR Stagea WC34 260RS RB26 RB26-81-OPG-M

Boundary Racing RB26 Oil Pump Gear Upgrade (OPG)

Designed to eliminate one of the RB platform’s most well-known weak points, the Boundary RB26-OPG replaces the factory asymmetrical rotor design with a precision-engineered, race-inspired symmetrical gerotor system. The result is significantly improved sealing efficiency, increased oil volume, and more consistent oil pressure throughout the rev range.

This upgraded gear set delivers a noticeable improvement in both idle and mid-range oil pressure, maintaining stability right up to the relief valve limit. By optimising oil delivery where it matters most, it provides critical protection for high-performance and high-RPM RB builds.

A key advantage of the Boundary design is the integrated crankshaft interface, which reduces wear on the crank snout and completely eliminates the need for a crank collar or spline drive modification. This allows for a straightforward installation—simply fit the gears into the housing as a direct replacement while gaining the benefits of a motorsport-grade solution.

Manufactured to exacting standards, each gear set is produced from a chromoly core, precision ground, and finished to ensure optimal fitment and long-term durability. Every unit is individually inspected, machine-checked, and supplied with a detailed blueprinting report for complete confidence.

For extreme applications, optional MartenWear thermal processing provides enhanced anti-wear properties, with proven reliability in engines operating up to 13,000 RPM.

Key Features:

Race-inspired symmetrical gerotor design for improved flow and strength
Increased oil volume with improved idle and mid-range pressure stability
Precision surface-ground gears for superior fitment and efficiency
Mirror-finished and surface-hardened for durability
High-strength chromoly core construction
Matched inner and outer gears for optimal performance
Eliminates need for crank collar or spline drive modification
Individually inspected with included blueprinting report
Optional MartenWear treatment for extreme anti-wear protection
Tested for reliability up to 13,000 RPM
 
Fitment:

RB26N1-OPG – Fits Nissan N1 Oil Pump Housing

Nissan Skyline GT-R R32 (1989–1994)
Nissan Skyline GT-R R33 (1995–1998)
Nissan Skyline GT-R R34 (1999–2002)
Nissan Skyline R34 GT-T RB25DET Neo (Pump P/N: 15010-5L800)

RB26-81-OPG – Fits Nissan OEM Oil Pump Housing

Nissan Skyline GT-R R32 (1989–1994)
Nissan Skyline GT-R R33 (1995–1998)
Nissan Skyline GT-R R34 (1999–2002)