Boundary VQ-S1-VHR Nissan VQ VHR 3.5L/3.7L Stage 1 Billet Oil Pump Assembly

The Boundary VQ-S1-VHR is a Stage 1 performance oil pump assembly engineered for the Nissan VQ VHR 3.5L and 3.7L engine. Built on the Nissan OEM housing and fitted with Boundary's signature mirror-finished billet steel gear set, this assembly is CNC-machined in the USA, flow-tested to 12,000 RPM, and backed by a lifetime warranty.

Every assembled pump undergoes a rigorous build process to ensure maximum reliability and performance right out of the box. An optional high-flow billet back plate is available for builds consistently operating above 7,000 RPM. Pressure shims are included, allowing tuners to dial in oil pressure to match the demands of their specific build.

Assembly Process:

• Pump is completely disassembled; all parts undergo ultrasonic cleaning, air blast, and hand inspection
• Hand de-burred for smooth internal surfaces
• Industry-leading mirror-finished billet steel gear set installed
• Stainless Torx head fasteners replace OEM hardware
• All fasteners torqued to spec with Loctite applied to prevent loosening
• Anaerobic sealant applied to critical areas to improve pump-up speed and reduce aeration
• Assembly lubricant applied to all critical surfaces for fast oil flow on startup
• Parts are blueprinted and issued with a specification sheet

Included Pressure Shims:

• +10 PSI shim
• +20 PSI shim
• +30 PSI shim

Validated in record-holding naturally aspirated and forced-induction VHR builds — including an 8,000 RPM world-record naturally aspirated quarter-mile car and a 900WHP supercharged VHR application at 8,500 RPM. Covered by Boundary's lifetime warranty and proudly made in the USA with 2 US patents.