ECU

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Converting your Datsun 1200 to electronic fuel injection? You'll need an ECU (electronic control unit). The easiest way is to swap in a purpose made kit ($2500-$3500 + cost of ECU) but the next easiest way is with an Nissan OEM retrofit of the Nissan factory A-series EFI (EGI). The EGI parts are relatively rare, so do-it-yourself fabricator can do it on the cheap -- as inexpensively as $300 -- by adapting OEM parts with a kit-built Megasquirt ECU.

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If you don't know basic automotive engine tune up procedures such as setting timing with a timing light, adjusting the idle speed screw, or don't have mechanical aptitude in general, you should not attempt to install an EFI kit. CustomEFIs

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MegaSquirt

MegaSquirt is the most popular inexpensive "do-it-yourself" ECU. It is just as sophisticated as aftermarket custom ECUs.

See main article Megasquirt

Nissan ECU

Nissan ECU Tuning

Bosch Motronic

http://www.atlllc.com/atlantis.php?page=Motronic%20Editor

This software is designed to read binary ROM images used in Bosch Digital Motronic Engine-management (DME) systems found in Porsche, BMW, Volvo, SAAB, and other European vehicles. It is user-extensible via customized spec files, and includes features for ferreting out the relevant locations that the fuel-injection maps are based on.

Bosch Motronic DME ECU/EFI http://sourceforge.net/projects/opendme

GM ECM

For controlling your EFI-converted Datsun 1200, you can use a General Motors (GM) ECM. The Electronic Control Module (ECM), also known as Electronic Control Unit (ECU),varies by year. Most have varying models of standard EPROM memory, while a few newer ones have built-in Flash memory. They can control anything from old 4-cylinder engines to the newest V8 engine designs.

 see: 
 * http://wiki.xtronics.com/index.php/EFI_ECU_FAQ
 * http://www.customefis.com

TunerCat

A product named C.A.T.S. Tuner is used to program/control the GM ECU. It works with certain 1984-1997 GM ECUs, and can modify the spark and fuel tables, as well as control certain on/off switches.

Get an ECU for 94 - 95 LT1 cars, it has built in Flash.

Parts needed

• Used GM ECU from wreckers ($25-up)
• GM EFI components:
  • GM sensors: Oxygen sensor, Air temp, water temp, MAF sensor (some models), TPS or MAP sensor
  • GM fuel injectors
• OR, Edelbrock system for GM ECU
• Tuner program ($70, free 30-day trial)
• ECM definition file to match the specific GM ECU ($20)
• For older ECUs, get any generic EPROM burner. For example, Pocket Programmer ($250) and EPROM Eraser ($57)
  • 94 - 95 LT1 cars don't need this, they have built-in Flash memory

    But they need an ALDL interface cable (?)

• Ground strap to protect electronics while flashing/programming ($5)

A product called Romulator plugs into the ECU and and into your laptop to control the ECU.

Real Time Tuner

RT Tuner allows programming while the engine is running. Flash based ECMs do not have a removable EPROM there's no way to connect an emulator to these ECMs so you can't do real-time tuning on these cars.

• All the parts above (but won't work with Flash ECU)
• RT Tuner ($100)
• [Romulator] or Ostrich or AutoProm