any way to trick the motor into going full rich?

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The computer will adjust the pulse width of the injector to keep it from running rich so I dont think that there is a way to make the engine run that rich.

This guy with a 240 sx has an injector from a CRX HF and a spark plug tapped into his exhaust pipe he hits a switch and the injector sprays fuel and the spark plug ignites it. The injector is a pretty good ways up stream in the exhaust and the spark plug is about a foot from the end of the pipe. When the gas hits the plug its a fine mist and burns nicely.

BTW it only works @wot if he hits it at part throttle the gas puddles in the exhaust pipe.

Hope this helps,
Later,