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Difficult to tell what could be causing the differences between the claimed outputs and the actual performance from your car.
There are several possible causes :
Boost leak.
Low boost, i.e. not leaking but boost pressure aspect of the remap not operating correctly.
Stuck (or poorly programmed) EGR.
Clogged DPF.
Dirty air filter.
IC seat soak.
Real-time diagnostics and adjustments to the remap while running on a dyno can identify whether there's a problem, and possible root causes.
You could try data logging the car yourself. A V-Gate V2 OBD dongle and the OBDfusion App can real-time log a wide range of data points which can then be exported to Excel. From there you can plot the data in graphically to see what's happening.
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Current : F31 330sD, remapped, Ohlins Road & Track, Millway camber plates, Quaife LSD, Stoptech brakes + Pagid RSL1 pads all round, Weichers front strut brace, Eibach front & rear anti-roll bars, Michelin MP4S.
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