Boundary Stage 2 High Flow Oil Pump for Mazda MX-5 NA NB

The Boundary Stage 2 oil pump is a must-have upgrade for MX-5s looking to run either a higher rev limiter or higher power. A good rule of thumb is anything over 300 horsepower or running over 7,000 RPM be installing billet oil pump gears. Shock loading caused by boost cut or RPM limit can shatter the OEM sintered oil pump gears, resulting in complete engine failure.

Consider it insurance if you’ve just built a forged engine with new pistons, rods, and bearings?you wouldn’t want all that to be ruined by an oil pump failure. The sintered gears inside of a stock oil pump assembly are only rated to about 6KSI of stress before shattering. These gears provide a serious structural upgrade to 90Ksi steel.

Stage 2 increases oil flow by machining a deeper pocket and installing larger gears into the oil pump. As a result, the oil pump gears are stronger and mid-range oil pressure is increased. The increased oil flow means this pump can be used with VVT engines.

All Boundary billet oil pumps start with a brand new pump which undergoes the following processes

• The pump is completely taken apart, and all parts undergo ultrasonic cleaning, air blast, and hand inspection
• The pump is hand de-burred
• A larger, industry-leading mirror-finished stage 2 gear set is used
• Stainless Torx heads replace the stock fasteners
• All fasteners are torqued to spec
• Loctite is applied to fasteners to prevent back-out or loosening
• Anaerobic sealant is applied to critical areas to boost pump-up speed and reduce aeration.
• Assembly lubricant is applied to all critical surfaces to get oil flowing fast on startup
• Parts are blueprinted and issued with a specification sheet

Stage 2 Pumps come pre-shimmed by the factory to 72psi. If you require a different relief pressure, remove the existing shim washer and replace with the relevant unit from the shim pack.

This is an assembled oil pump with billet gears to suit the 1990-2005 engines, including the 2001-2005 1.8 VVT engine. A front main seal is not included.