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KA24DE SR20DE 240SX MegaSquirtPNP Gen2 Plug and Play ECU
MegaSquirtPNP G2 NS8994 for the 89-94 Nissan 240SX - Manual Trans
MegaSquirtPNP G2 NS8994 for the 89-94 Nissan 240SX - Manual Trans
KA24DE SR20DE 240SX MegaSquirtPNP Gen2 Plug and Play ECU
KA24DE SR20DE 240SX MegaSquirtPNP Gen2 Plug and Play ECU
MegaSquirtPNP G2 NS8994 for the 89-94 Nissan 240SX - Manual Trans
MegaSquirtPNP G2 NS8994 for the 89-94 Nissan 240SX - Manual Trans
KA24DE SR20DE 240SX MegaSquirtPNP Gen2 Plug and Play ECU

KA24DE SR20DE 240SX MegaSquirtPNP Gen2 Plug and Play

5.00 out of 5 based on 1 customer rating
(1 customer review )

From: $799.00


USB to Serial Adapter -TunerStudio – optional

In stock

In stock


KA24DE SR20DE 240SX MegaSquirtPNP Gen2 Plug and Play Standalone Engine Management System is compatible with the following:

1989-1994 Nissan 240SX KA24E or KA24DE with manual transmission
*Also fits the following USDM applications (all with manual trans):

  • 1991-1994 Nissan Sentra / NX1600 / NX2000 with GA16DE or SR20DE
  • 1991-1993 Infiniti G20 with SR20DE
  • 1990-1995 D21 Hardbody pickup with KA24E
  • 1993-1994 Altima with KA24DE

KA24DE SR20DE 240SX MegaSquirtPNP Gen2 Plug and Play is the easy button to expanding the capability of your KA or SR20 motor powered race car!

KA24DE SR20DE 240SX MegaSquirtPNP Gen2 Plug and Play #NS8994 Features:

  • Fully Plug and Play Installation – No wiring required for basic functionality.  Average install time is under 1 hour!
  • KA24 base maps is pre-loaded to help your engine start on the first turn of the key (other model base maps included on USB stick)
  • Real time tuning and data logging with a laptop connection
  • Supports most aftermarket wideband sensors

Fully Tunable Engine Control!

  • 16×16 Fuel Tables allow high resolution tuning
  • 12×12 Ignition Tables
  • Multiple Acceleration enrichment strategies
  • Closed Loop Idle Speed Control
  • Air Conditioner Control
  • Up to 4 sequential fuel injector channels with individual trim tables (optional trigger disc required for sequential injection)
  • Onboard peak and hold drivers support both high and low impedance injectors – No external ballast resistor is needed!
  • Allows removal of stock airflow meter

Advanced Feature Set (Included!)

  • 12×12 Air Fuel Ratio Target Tables for use with wide band O2 sensor for precise tuning and table trim.
  • Built-in 2-step rev limiter / launch control with flat shift
  • Real time barometric correction
  • Internal 4-bar MAP sensor reads up to 44PSI of 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 you tune!
  • Table switching input. Change fuel and spark maps on the fly for different fuels, nitrous activation, etc.
  • Input for flex fuel sensor – switch between E85 and gasoline on the fly!
  • CANBus connector allows interconnection of other MegaSquirt-compatible devices for additional functions (EGT Input, Automatic Transmission Controller, Additional Sensors…..the possibilities are limitless!

Note: Many of these models do not have an IAT (Intake Air Temperature) sensor from the factory. On these cars, we strongly recommend installing a GM IAT to allow for air temperature correction.

What you get in the box:

  • KA24DE SR20DE 240SX MegaSquirtPNP ECU
  • MSPNP RS232 serial tuning cable, 6′ (USB adapter sold separately, if needed)
  • Tuning Software and Documentation USB Stick
  • 6′ Vacuum Hose for MAP Signal and ‘T’ fitting
  • Four Screws for ECU mounting

Note: Although there is a paid upgrade to TunerStudio, it is not needed to tune this ECU. The free version included on the USB Stick can access all the features and tables of the MegaSquirtPNP. The paid version of TunerStudio simply adds tuning and analysis software, such as VE Analyzer Live (auto tune) to tune the fuel tables based on wideband O2 feedback (requiring a wideband O2 sensor and controller, sold separately).

Customers' review

Rated 5.00 out of 5 stars
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1 review for KA24DE SR20DE 240SX MegaSquirtPNP Gen2 Plug and Play

  1. 5 out of 5

    Best bang for the buck! As you already know, MS is great. The ease of install with the PnP is awesome. I currently have the DIY Trigger Wheel and LS2 coils setup. I have configured my e-Fan to work with the ecu as well. No separate fan controller needed which saves money or the money you were going to spend on the unit, put it towards the EMS. With Boost control available, MS can control just about everything. It is great to be able to open your laptop and control a majority of components in one program rather than having piggybacks with separate controllers. The list goes on and on and so far, I have not used all of the features. To top it off, DIY's customer service is great! Always there to help and courteous. Keep it up DIY!

    Was this review helpful to you? 4 of 5 people found this review helpful

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Is this all that I need to get started tuning my 240SX?

  • The only other potential must-have is that if your laptop doesn’t have a 9 pin serial port, you will need our USB to serial adapter to connect to this unit. However, there are several other things you may wish to add to use this unit to its full potential.
    • If you are tuning it yourself, a wideband O2 sensor system is a must have for adjusting the fuel.
    • Our bolt in trigger wheel kit will allow using sequential injection or distributorless ignition conversions. Single cam KA24E motors typically require a 54 mm trigger wheel, while twin cam KA24DE motors usually require a 50 mm trigger wheel. This MSPNP fits a wide variety of applications and Nissan built many variants of this engine, so please measure the wheel in your distributor before ordering a trigger wheel.
    • This unit can function as a boost controller if you add our boost control solenoid package.

My car originally came with an automatic transmission, but I’ve swapped it to a manual transmission. Will this MSPNP work for my car?

  • Yes. The only difference between wiring for manual and automatic transmission cars for this model are the wires used for transmission control.

Where is this product assembled?

  • This product is assembled in Suwanee, Georgia, USA.

Questions & Answers

  1. 0 votes

    Yes, fan control is standard on this application.

  2. 0 votes

    Yes, although on some applications you may need one of the outputs for fans or the like, so some installs will need to run the coils in pairs instead of fully sequentially. You will need our drop in trigger disc - please check if you need the 50 mm trigger disc or 54 mm trigger disc before ordering.

    If your coils don't have built in ignition modules, this is not a problem - just add our QuadSpark ignition module. The only "gotcha" are motorcycle CDI pencil coils, which have very low spark energy if you try using a conventional ignition module. I've seen these used in a few poorly thought out coil on plug "conversion kits". If you really want to run a set of motorcycle CDI coils, you could use an M&W multi channel CDI box.