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I bet the wideband o2 sensor on the dyno used a probe for the tailpipe. The lean condition at low RPMs is a result of insufficient exhaust gas volume flowing through the small diameter probe which...

Injecotrs are rated at 3 bar fuel pressure. So your 259cc injectors, at 3 bar, should flow 259cc in one minute.

Have you put a wideband 02 sensor in the car to see if it is overall rich or lean? ...