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Christ, that is right. It's not a bang, it's a burn throughout injection. Although generally the injection duration is only a couple crank angles. The more fuel you want to inject the longer the injection duration will be, as injection pressure and nozzle orifice size are fixed. That's why people end up putting larger nozzles to make more power, since they want all their fuel injected as close to TDC as possible, because late injection is inefficient and finish burning down in the exhaust (that's how the new CR TDI does it to burn off the DPF, late injection events, as the CR system has the capability to manage multiple injections events per cycle). I don't really see how varying AF ratio is relevant to the discussion though.
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