According to
Autocar, Bosch, the maker of the water injection system featured in the BMW M4 GTS, is now offering the technology to the wider automative market. Beginning in 2019, we'll see the feature implemented in other manufacturer's cars. But, as co-developer of the system, BMW will likely first introduce the water injection system into more of its models.
Although the water injection system's primary role in the M4 GTS is to boost power (up to 5%) and prevent heat soak, Bosch says its primary focus is to improve fuel economy and reduce emissions, with a promise of a boost in fuel efficiency by as much as 13% and reduction in CO2 emissions by 4%.
A Bosch representative explained that the system Bosch is offering to the market is basically identical to the one on the M4 GTS and BMW's co-operation was highly beneficial to overall development.
The representative said: "It's pretty normal thing to have a pilot customer to develop the system together before offering it to the market, and now as we launch to the wider market the system’s costs will come down as volume goes up."