EFI Conversions - Throttle Body Injection

The simplest EFI conversion from carby is to use a TBI system from a similar capacity donor car in its entirety, wiring loom and all. Leave as much plugged in as possible or replug sensors to the loom ASAP. Do some research on the system and rationalise the wiring diagram back to only what is needed. Locate connection points to provide power from the ignition (original coil power will do) and a heavy lead to the battery + to drive the fuel pump and injectors via the EFI relay. Unbind the main trunk and remove all of the cables not required and tape the loom back together every 300mm to position the branches to the reach new mounting locations in the vehicle.	Large flow ford air meter
Camira TBI fitted to an old Landrover motor
Bit big for a Camira TBI - nice for a V8	Tape the loom tightly with good PVC tape before attaching it to the bodywork with suitable ties. All of the sensors and ignition can be fitted to the vehicle in locations to suit the new loom. The mounted throttle body injection unit mounts easily to most 2 stud single throat manifolds using countersunk screws.

Install high pressure fuel hose and plumb the high pressure pump to the tank. Some pumps mount in the tank requiring a tank swap. External pumps will fail in a short time sucking through the standard fuel feed from the tank. The purge points for the fuel system should connect to the vacume points provided on the throttle body and the brake booster should be reconnected. Install the ignition system from the donor with its distributer (most types can be adapted), connect the battery all should be done. It is never that simple but look around the site for more details on specific jobs that need to be completed. Power output from the 1.8 MPI motor is a very healthy 83Kw. The larger 2.0 litre motor produces only 2 Kw more using the Delco ECU but shows a significant torque impovement. The TBI motor is well down on power and torque compared to the MPI systems. This may not be conclusive for all models but clearly the case for family II GM motors.

Camira Power and Torque Graph