Torque app logging - Overreading fuel flow

Has anyone here used the Torque app to log data from the OBD port?

I have been logging some data from my Ford Fusion 1.6 TDCI, during a full accelration pull I have;

92.6 g/s MAF

552.8 cc/min Fuel flow

Assuming that the stoichmetric AFR is 14.46 and the fuel has a density of 0.8345 g/cc I have calculated the Lamda as follows;

552.8*60 / 92.6 * 14.46 * 0.8345 = 0.83

This gives a lamda of 0.83. In other words the ECU is putting more fuel in then it has oxygen to burn. I'm assuming a value like this would lead to plumes of black smoke, yet there isn't any with my car. I think there is an error with the OBD reading. Has anybody looked at torque logs before? Any ideas why the fueling is so far off?