Sniper EFI Manifold Absolute Pressure Sensor

Sniper EFI MAP Sensors: Precision Pressure Monitoring for EFI Builds

When converting a classic muscle car or street rod to electronic fuel injection, every sensor in the system plays a critical role — and none more so than the Manifold Absolute Pressure (MAP) sensor. Holley EFI requires several pressure inputs in order to run an engine, and the first and most important is the manifold absolute pressure sensor (MAP). The manifold absolute pressure sensor provides instantaneous manifold pressure information to the engine's ECU, and that data is used to calculate air density and determine the engine's air mass flow rate — which in turn determines the required fuel metering for optimum combustion and influences ignition timing advance or retard.

Sniper EFI, Holley's performance-focused EFI brand, offers a MAP sensor engineered specifically to complement its fabricated intake manifold ecosystem. The Sniper EFI MAP sensor monitors manifold vacuum, varying output voltage to the ECU as a function of load placed on the engine, and provides necessary data to control fuel enrichment. The pressure inside the intake manifold is an extremely important input to the ECU, and this sensor responds to changes in manifold pressures, relaying the information to the ECU in the form of a voltage signal ranging from 1 to 5 volts.

Built for Boost: The 2.5-Bar Advantage

One of the most important specifications for any MAP sensor is its pressure range — especially on forced induction builds. One bar is the atmospheric pressure experienced at sea level (14.7 psi), so a naturally aspirated engine at wide open throttle would never theoretically see more than one bar in the intake manifold. When an engine utilizes forced induction through a turbo or supercharger, the amount of pressure can be drastically higher — an engine with 14.7 psi of boost would require a 2-bar MAP sensor for the ECU to accurately measure manifold pressure.

The Sniper EFI MAP sensor is rated at 2.5 bar, making it ideal for applications up to 25 lbs of boost, and is designed specifically for Sniper EFI intakes and GM LS-series engines. This broader pressure range gives builders headroom to push power levels without sensor saturation — a key consideration for turbocharged or supercharged LS swaps and performance builds.

Seamless Integration with Sniper EFI Fabricated Intakes

This 2.5-bar MAP sensor is designed for Sniper EFI Fabricated Intake Manifolds that include a MAP sensor provision, making installation straightforward for builders already working within the Sniper EFI ecosystem. Sniper EFI Hi-Ram sheet metal fabricated intake manifolds for LS1/LS2/LS6 engines now include a dedicated mounting provision for the MAP sensor on the rear of the intake plenum, allowing for a clean, factory-style installation.

When using the MAP sensor with a Holley EFI system, part #558-416 harness adapter will be required. This ensures proper signal communication between the sensor and the ECU, keeping your tune accurate and your engine running at its best.

Why Choose Sniper EFI for Your MAP Sensor?

• Boost-ready range: Handles applications up to 25 lbs of boost — perfect for forced induction performance builds
• Precise voltage output: Responds to changes in manifold pressure and outputs a voltage signal from 1 to 5 volts to the ECU for accurate fueling calculations
• GM-style fitment: Uses a GM MAP sensor style, compatible with popular LS-series engine platforms
• System-matched design: Engineered to work seamlessly within the broader Sniper EFI ecosystem, which ranges from flagship bolt-on Sniper 2 EFI systems to intake manifolds and other fuel system components

Whether you're building a turbocharged LS swap or upgrading the sensors on an existing Sniper EFI intake manifold setup, the Sniper EFI 2.5-bar MAP sensor delivers the accuracy and compatibility your build demands. Explore the full Sniper EFI brand lineup or browse all Manifold Absolute Pressure Sensors to find the right fit for your application.