MegaSquirt Plug-N-Play Standalone for Nissan 240SX '89-'94 Manual Trans

MegaSquirt Plug-N-Play Standalone for Nissan 240SX '89-'94 Manual Trans

Take control of your engine with the MegaSquirtPNP Gen 2 Plug-N-Play Standalone ECU. Specifically designed for 1989–1994 Nissan 240SX models equipped with the KA24E or KA24DE and a manual transmission, this unit offers a true plug-and-play experience—no wiring required for basic functionality, with average installation time under one hour.

Also fits the following USDM applications with manual transmission:

• 1991–1994 Nissan Sentra / NX1600 / NX2000 (GA16DE or SR20DE)

• 1991–1993 Infiniti G20 (SR20DE)

• 1995 Nissan D21 Hardbody Pickup (KA24E)

• 1993–1994 Nissan Altima (KA24DE)

MegaSquirtPNP NS8994 Features:

• Fully Plug-and-Play Installation: No wiring required for basic setup; average install time is under one hour.

• Pre-Loaded Base Maps: KA24 maps come pre-installed to help start your engine on the first turn of the key. Additional base maps included on the CD.

• Real-Time Tuning & Data Logging: Easily connect to a laptop for tuning and monitoring.

• Wideband Compatibility: Supports most aftermarket wideband O2 sensors.

• Fully Tunable Engine Control:

• 16×16 fuel tables for high-resolution tuning

• 12×12 ignition tables

• Multiple acceleration enrichment strategies

• Closed-loop idle speed control

• A/C control

• Supports up to four sequential fuel injector channels with individual trim tables (requires optional trigger disc)

• Onboard peak and hold drivers support both high and low impedance injectors—no external ballast resistor required

• Allows removal of stock airflow meter

Advanced Feature Set:

• 12×12 air-fuel ratio target tables for precise wideband O2 tuning

• Built-in 2-step rev limiter and launch control with flat shift

• Real-time barometric correction

• Internal 4-bar MAP sensor (supports up to 44 PSI boost)

• Overboost protection

• Closed-loop boost control (requires EBC solenoid kit)

• Knock sensor input with adjustable sensitivity

• Headphone output for knock sensor—listen for knock while tuning

• Table switching input for swapping fuel and spark maps on the fly (ideal for nitrous, alternate fuels, etc.)

• Flex-fuel input support—switch between E85 and gasoline on the fly

• CANBus connector for compatibility with other MegaSquirt devices (EGT input, automatic transmission controller, additional sensors, etc.)

Note: Many of the compatible models do not include a factory Intake Air Temperature (IAT) sensor. A GM IAT sensor is strongly recommended to allow proper air temperature correction.

Included in the Box:

• MegaSquirtPNP NS8994 ECU

• 6′ RS232 serial tuning cable (USB adapter sold separately if needed)

• Tuning software and documentation CD

• 6′ vacuum hose for MAP signal and T-fitting

• Four mounting screws for ECU installation

Software Note:
The free version of TunerStudio (included on the CD) provides full access to all features and tables of the MegaSquirtPNP ECU. The paid version of TunerStudio adds advanced tuning and analysis tools, such as VE Analyzer Live for auto-tuning fuel tables using wideband O2 feedback (wideband sensor and controller sold separately).

Legal Notice:
For competition and off-road use only. This product is not legal for use on vehicles that are registered, licensed, or operated on public roads.

Updated April 3, 2025.