The water injection system from the BMW M4 GTS will feature in more car models from 2019, as its maker Bosch is now offering the technology to the wider automotive market.
The system works by spraying a fine vapour of distilled water into an engine’s intake before fuel combustion, reducing engine temperatures and therefore decreasing knocking, which wastes fuel. The results improve efficiency and increase engine power output as a result of faster ignition times.
Although the system was first introduced in BMW’s track-focused coupé and can offer a 5% boost in power, Bosch says its primary focus is to improve fuel economy and reduce emissions. It backs this claim up with promise of a boost in fuel efficiency by as much as 13% and reduction in CO2 emissions by 4%, according to the internationally recognised WLTP (Worldwide harmonised Light vehicles Test Procedures).
Speaking exclusively to Autocar, Bosch global project manager Fabiana Piazza said that these gains can be felt on anything from a supermini to a supercar.
“The system works best on cars with an output of more than 80kw (107bhp) per litre,” she said. “We’re launching it into the market now as tighter legislation and new real driving emissions tests are increasing the importance of this technology in all cars.”
Piazza explained that the system Bosch is offering to the market is basically identical to the one on the M4 GTS. Her colleague, Martin Frohnmaier, who is the project’s lead, added that BMW’s co-operation was highly beneficial to overall development.
He 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.”
Due to the small quantity of water used during running, the amount needed to be stored is very low. The M4 GTS, for example, uses a five-litre tank stored in the boot. While volumes can vary depending on each model and space available, Bosch says in most cases the tank will only need to be refilled every 1800 miles on average.
Join the debate
Add your comment
November 2019 is here, watter injection is in no one car!
No one car is in production yet! BMW M4 GRS was in production Jan 2016 - July 2017, 500 or 700 cars. And now?
Wnere are effect from tighter legislation? (“We’re launching it into the market now as tighter legislation and new real driving emissions tests are increasing the importance of this technology in all cars.”)
Or effect is ONLY during accelerating and speed over 200km/h and NOBODY need it? Until now for last 30-40 years production of this high efficiency technology in engines with -13% fuel consumption was only 700 cars in 2016-2017, when world production is 110 mil. cars yearly?
BMW copies GM, owner of Vauxhall, in technology 55 years later.
Thanks BMW