As part of the fuel injection conversion final tuning stage, the plan is to move from phased batch injector firing to sequential firing. In phased batch two injectors are fired at the same time. On the TR6 number one and number six fire simaltanoeusly so one of those fires toward the back of a closed valve. Sequential injection fires individual injectors as the intake valve opens. Surprisingly those in the know say there is little to be gained by upgrading to sequential injection other than the ability to trim individual cylinders. With number six cylinder running a bit rich I’ll soon be able to lean it out a tad.

Electromotive’s TEC3 system has the ability to switch to sequential injection by changing a couple of menu options and some injector wiring. The only additional hardware required is a camshaft position sensor to announce when number one cylinder is approaching top dead center. The timing cover was my first thought. Add a tooth to the face of the cam gear and poke a magnetic pick up through the chain cover. This can be done but it is wouldn’t be as clean an installation as I’d like and could be destroyed if the fan belt broke. It dawned on me that the distributor was still in place to drive the oil pump and mechanical tach. Although the computer puts out a tach signal for an electronic tach, I wanted to stay with the original instrumentation. I had planned to cut the distributor down to just a stump as a tach drive so why not add the cam sensor to the same stalk?.