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Look past the colourful stickers and roof-mounted lights and this BMW M4 MotoGP Safety Car features some very clever technology under its bonnet. Water injection; a system BMW M’s engineers have borrowed from a banned idea from motorsport and are experimenting with it on the M4. Don’t think that the water is injected into the engine itself, that’d be catastrophic for the M4’s TwinPower turbocharged 3.0-litre six-cylinder unit. No, the water here is injected into the turbo system. Doing so allows the air in the pre-combustion collector to be cooled, thus increasing its density and oxygen content.
