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Discussion Starter · #1 ·

BMW has found some life in water, too, squirting the stuff into the intake plenum of the M4 GTS’s S55 twin-turbo inline six-cylinder engine to make more power.

Water injection isn’t a new technology, even for production cars. More than 50 years ago, General Motors offered a water-injected turbocharged engine in its 1962–63 Oldsmobile Jetfire. If you never heard of that one, it’s probably because most were converted to use conventional carburetors after the secondary injector system dried up when owners didn’t refill the tank of “Turbo-Rocket” fluid, as GM called its methyl-water cocktail.

Any liquid, as it transitions from a liquid state to a gaseous state, can do this magic. The evaporation process converts some of the unwanted heat into harmless humidity. Lowering the intake temperature prevents engine knock and the unwanted detonation of fuel, and it also allows the turbos to produce more boost—21.6 psi versus 17.2 in the regular M4—and the electronics to advance the timing. The result in this case is a 49-hp bump from the 444-hp Competition Package M4, to 493 horsepower.

Check out the video here to watch the GTS running a 7:27.9 lap of the Nürburgring Nordschleife, quicker than that of a Ferrari 458 Italia:

front-engine, rear-wheel-drive, 2-passenger, 2-door coupe


twin-turbocharged and intercooled DOHC 24-valve inline-6, aluminum block and head, direct fuel injection, port water injection

182 cu in, 2979 cc
Power: 493 hp @ 6250 rpm
Torque: 443 lb-ft @ 4000 rpm

7-speed dual-clutch automatic with manual shifting mode


Wheelbase: 110.7 in
Length: 184.6 in
Width: 73.6 in Height: 54.4 in
Passenger volume: 54 cu ft
Cargo volume: 11 cu ft
Curb weight (C/D est): 3550 lb


Zero to 60 mph: 3.4 sec
Zero to 100 mph: 8.1 sec
Standing ¼-mile: 11.5 sec
Top speed: 190 mph


EPA city/highway driving: 16/23 mpg

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745 Posts
One problem some people might have here is for the same price of this they can get a 911, and if you want to step into this level of performance and refinement, a 911 should be on your list. I love the M4, but not sure if i would push for the GTS.

When you're open to getting a used 911, it gets even better.

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For that price you could just get the 911 Carrera 4 GTS. Not something I would spend on BMW as nice as the M4 is. Maybe a BMW enthusiasts will but it but if I had a choice, I could probably get s used vehicle with more power.

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745 Posts
That's exactly what I was thinking but it all depends on what someone wants and it can be said that the M4 is better in some ways. Having been a long time Porsche fan and knowing what I know about the Carrera GT4, it's the way I rather go. M4 is the highest i'll go in the 4-Series range. It's a GT car to me, that's all. The Carrera offers a bit more refinement in driving
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