ECU (Electronic Control Unit)

  The ECU can do an amazing number of things.  The fuel map and fuel pump are its main priority, but it can control spark timing, knock sensors, electric fans, rev limiting and nitrous.  Using an adapter (sold separately) connected to the distributor, crank trigger, or a CD ignition you can adjust the spark timing.

  The AC ducts make good mounting surfaces for the ECU.  The wires will come out of the right side and go straight through the firewall.

I removed a bolt and used the hole as the start of my wire loom hole.  A massive 2 inch hole is required so that connectors can pass through the hole.  Be sure to check that your wire loom will reach all of your sensors before you start cutting.

It isn’t pretty, but it’s sealed.

The ECU installed and ready to go.

SENSORS

  An O2 bung is included, but I had one installed already.  It should be as close to the manifold as possible so that it will warm up and start working quickly.   The O2 sensor needs to be at least 800ºF before it will start to work.  Long tube headers can be a problem because the temperature can be below 800º in the collector during idle even when the car is warmed up.  The O2 may fail to enter closed loop, or it may sense a false lean condition at idle.  To fix this the computer can be adjusted so that it runs in open loop at low engine speeds.  

  The coolant sensor is of slightly smaller thread diameter than the stock sensor so an adapter had to be purchased.

The MAP sensor mounts easily on the firewall.