New Rumors Surface about 4-Cylinder Turbocharged BMW Engine, this time for Z4 Roadster

Last time we reported about BMW's long-rumored family of turbocharged 4-cylinder engines, it was in the summer of 2010. Meanwhile, the German manufacturer hasn't revealed anything on the matter, giving the whole affair an almost mythical status.

However, a new rumor has surfaced, with Automobile Magazine tweeting that the entry level BMW Z4 will soon get a new, 4-cylinder force inducted engine, as a replacement for the naturally aspirated inline-six.

The exact tweet was “BMW new 4-cyl coming this year in Z4 roadster. Replaces nat asp 6, so at least 200 hp” and, seeing that average fuel consumption regulations and emissions standards are getting stricter by the day, it sounds like a logical move for BMW.

The Bavarian company sure knows how to build a fine turbocharged engine and there are many models in its line-up that could benefit from a more frugal, and equally if not more powerful four-pots. The 1-Series and 3-Series are just two that come to mind right, although we’re pretty sure that X3 owners wouldn’t mind better fuel economy as well.

Clearly, the question here is not “why”, but rather “when”, and at the rate things are going, we’d say let's meet up again this summer and we’ll hopefully have some more official info for you.

U-SPY: Carscoop Reader Snags a Fleet of BMW Prototypes in Austria

The BMW Group is quite busy these days as the Bavarian automaker is developing a raft of new models, ranging from the upcoming Megacity electric-vehicle and the MINI Coupe and Roadster, to the next generation of the 3-Series and the production version of the Vision ED concept sports car.

Carscoop reader Andras from Hungary was vacationing in Obertauern, Austria when he spotted this convoy of BMWs comprising of both masked prototypes and normal production cars, including a sedan in full body cladding. Check out Andras' photos and story after the jump.

Andras Deak's Scoop:

"I am currently in Obertauern, Austria for my holidays and discovered a small parking place dedicated to BMW. I walked there to check the cars and took some pictures.

There were 4 "cooling boxes" for cars. At the parking area I recognized a heavily camouflaged next-gen BMW 3-Series (possibly a hybrid version), the brand new X3 with some light camouflage (also possible hybrid version) and several 5-Series... Note that all the cars were plugged into something which looked like an electric charger to me.. Maybe a plug-in hybrid?

The interior of the next-gen 3-Series looks like all the new BMWs these days. It looked like a small 7-Series from the inside. The navigation screen is huge. I could see several fingerprints on the screen (maybe touchscreen?), but also an iDrive controller..."

Köszönöm for the pictures Andras!

G-Power Transfers BMW M5 Hurricane RR Supercharger Tech to the E85 Z4 Roadster

German tuner G-Power has decided to share some of the technology found on the 800-horsepower M5 Hurricane RR and M6 Hurricane RR with the masses by offering a modified version of the supercharger system on the [previous generation] E85 BMW Z4 as well as the E46 Series with the 3.0-liter straight-six engine. On both models, the redesigned SK Plus supercharger system replaces the previous ASA TM3 supercharger.

The geometry of the compressor has been modified as has the housing, resulting in a more efficient build-up of boost in the middle rev-range. With a 0.3 bar pressure boost, the SK Plus kit increases output by 55 ponies, to 286 hp and 345 Nm (255 lb-ft). Thanks to the extra oomph, the tuned Z4 accelerates from standstill to 100 km/h (62 mph) in 5.4 seconds.

To be able to wring out every bit of performance delivered through force induction, the German tuner recommends customers to specify their cars with a 9-way adjustable coil-over sport suspension. 20-inch multi-spoke Silverstone Diamond alloys, wrapped around in 245/30 front and 285/25 rear Michelin tires, can be ordered, too. For a more ferocious roar, G-Power can provide a new, hand-built rear silencer, with matching tail pipes.

Granted, these changes don’t transform the Z4 SK Plus into a Hurricane killer, but the tuner charges only €2.500 (VAT excluded) for the performance upgrade, which as we mentioned previously, is also available for the E46 BMW 3 Series.