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Lag is caused by the turbo (diesel is, actually, a turbo-diesel engine). When at low rpm and suddenly floor it, it may take a short moment before the turbo will spool up and create enough boost (1750rpm+ for the 320d) for the engine, therefor the 'turbo lag'.
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BMW 320 dA LCI, BMW PPK - 197HP, 2010, sapphire black, steptronic
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