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The JB+ and other units increase boost but typically leave it to the DME to retard timing when knock is sensed. Since the stock ignition timing is typically set to a conservative value, more advanced ignition timing can improve engine efficiency and fuel economy..
Flash tunes can provide an even greater benefit because they can advance the ignition timing close to the knock threshold where even more efficiency (and power) gains can be had.
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2011 BMW 135i ///M-Sport, DCT
Bilstein B12 kit, Dinan camber plates, M3 front control arms, Whiteline poly RSFB, MHD Stage 1, cp-e Charge Pipe, H&R Front sway bar, BMW performance diffuser
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