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G Power - Schrobenhausen, Germany

Inside the works.

Pablo Mazlumian
Sep 21, 2011

While there’s no doubt G-Power systems add copious amounts of power to BMWs, they seem to be a cut above the rest through myriad advantages over their competition. I got a chance to visit the facility in Schrobenhausen, Germany, and was instantly sold.

Epcp 1110 02 o+g power+rendering Photo 2/6   |   The 3D picture gives exact measurements to work with, giving the engineers all their options so they can maximize performance while achieving a factory-like fit.

As we would expect from German engineering, these guys are meticulous about the design and testing of their kits. Through CAD and plastic molding they ensure a factory fit and finish to each component before they have the final casting molds made. Each part is inspected or tested before going on a kit, and, with a proper tune that’s tested throughout different parts of the world, each supercharger kit offered is also tested at very high speed to ensure reliability of the total package.

In the case of one of their many supercharged E92 M3s, G-Power CEO Christian Stöber drove his own car to the high-speed track in Nardo, Italy—nearly 1,000 miles from G-Power headquarters—and reached 207 mph for more than 12 miles at a time. Not only was this done multiple times, he also spent the day on a road course before trekking the long, winding road home to Germany, and all on pump fuel.

The G-Power marriage to ASA superchargers brings the total package together by using a supercharger that not only draws no parasitic losses below 1800 rpm through its patented clutch system, but through a unique design that allows the supercharger to spin twice as fast as the competition’s (105,000 rpm) for a substantial increase in midrange torque. This is how Stöber’s car was able to see over 370 lb-ft of torque—over a 110 lb-ft improvement over stock—in his 530 wheel-hp dyno pull.

Epcp 1110 01 o+g power+building Photo 3/6   |   ASA and G-Power share this same building on a very unassuming German country road outside Schrobenhausen. All the magic happens here and at another building a block down the road (which is next to a cattle slaughterhouse).

These attributes are what won over none other than Alpina—the world’s foremost BMW tuner—when they thoroughly tested all the supercharger kits that other tuners begged them to use. And with Alpina’s stringent testing requirements, ASA tests each supercharger sent to Alpina, making sure the requirements even exceed Alpina’s expectations by 100 percent. If it does not, the part is scrapped.

“It’s the total package we’re going after,” says Stöber, who is also the brains behind each of the kit’s software tuning. “We want our customers to feel they can drive this car on the road, on the track—whether at high speed or low—without problem. Although we drag less and yet make more midrange torque than our competitors with the ASA supercharger, we could still get more power out of these cars. But, and even more important, we also want the same factory-like reliability and drivability these customers bought their cars with in the first place.” G-Power believes so highly in their reliability that they even warranty the car’s engine for a period of one full year.

While in Schrobenhausen, G-Power threw me the keys to several of its cars, including their signature widebody X5 M with a nutty 610 hp, and, my favorite, one of the several 4.4-liter M3 GTS samples they’ve supercharged to 635 hp. Expect features on both very soon. I also got a taste of the twin-supercharged “Hurricane RR” BMW M5, similar to the one featured a few months ago (“Storm Warning,” May ’11) with 800 hp and good for a time-warping 231 mph. While ultra smooth, that car is insanely fast, yet still not seemingly overstrung. It’s the ultimate sleeper.

For questions about ASA and G-Power products in North America, visit

By Pablo Mazlumian
81 Articles



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