One of efi secrets on fuel saving over old school carburettor is that on deceleration, throttle closed, the ECU/ECM will cut the injectors from squirting fuel.  This will not happen in Angel Gear, for it is the wheels / transmiison that keeps the engine turning over. Has anyone worked out, or know at what revs this injector generally happens on our EJ cars?

Overrun fuel cut deactivation is typically a table based on coolant temp. Minimum RPM at full temp is usually somewhere between 1200 and 1800 rpm at full temp. Above that RPM any throttle position under about 1.5% activates fuel cut. There is typically a large timing retard that occurs during activation and deactivation to smooth the transition. 

GD

Now, that is some pretty handy info GD. If I then asked if you know more specifics of EJ202 1999 era, get any closer to that sweet rev moment? I am thinking, if I pick a lower gear , to get higher revs, above 1800 -2000, on decel runs, I may achieve better economy ....though am real happy with it's long term average of 7.75 litres per 100 km (62.5 miles) And, the tinkerer I can be, thinking if I rigged a NOID light in cabin, powered by the main relay circuit (same as the injectors) then a wire off an injectors pulse wire _ I could watch when the noid light goes out - should indicate when the OFC is activated  or, I might just upset the ECU

Edited July 8, 20232 yr by Steptoe's photos

You would have to test it. These are general principles used by all fuel injection but the subtleties of individual implementations are not something I have tested or disassembled the code looking for.

GD