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2013 Dinan S3 BMW 550i

Steve Dinan has been enhancing BMW models since 1979. But don't throw his company into the ring with the dozen or so other tuners who tweak, tinker and piggyback upgrades on the famed German marque. Dinan is a tuner, but it's also an engineering firm that writes its own software, builds its own parts and then backs everything it does with a factory-grade warranty. That sort of fastidiousness comes at a price, but most of its customers - including the powerhouse of BMW Motorsport - rely on Dinan to help them come out on top.
In stock form, BMW's 550i is a formidable four-door with a twin-turbocharged 4.4-liter V8 rated at 400 horsepower and 450 pound-feet of torque. While those figures allow it to run with quick company (0-60 in 5.0 seconds, according to the automaker), Dinan puts the sedan's kettle on full boil with its S3 package. Starting with the engine, the performance engineering firm bolts on larger turbochargers, air-to-water intercoolers, a trick strut tower brace cold air intake, a quad-pipe free flow exhaust and its own engine management software. Pump in some premium fuel, and the result is 542 horsepower and 587 pound-feet of torque. Power is sent through the stock eight-speed automatic to a limited slip rear differential (Dinan will upgrade xDrive all-wheel drive models, too).
The Dinan S3 also features and extensive suspension upgrade that includes new front camber arms and low compliance rear control arms (engineered to reduce understeer and improve turn-in). The stock dampers are retained, but new bump stops are installed along with new springs. Overall, the car rides about a half-inch lower than stock to improve roll rate. To reduce unsprung weight, forged 20-inch HRE Performance wheels are fitted at all four corners (wearing Michelin Pilot Super Sport tires - 275/35ZR20 up front and 295/35ZR20 in the rear). Lastly, the company remaps the factory Electronic Damper Control (EDC) software with its own Dinan Shockware to work in conjunction with the new enhancements.

Watch the BMW i8 get wrung out on the Ring

Been wondering where the heck the reviews of the all-new, plug-in-hybrid BMW i8 have been? After all, the car isn't exactly new, having debuted in concept form way back in September of 2009. In August of last year, we even tested a prototype of the new supercar. Despite that, though, we still haven't gotten a crack at the actual vehicle that will be sold to the public.
Well, we're happy to tell you that we're currently testing the i8 and will have a proper review for you soon. If, however, you're just aching for some coverage of the low-slung plug-in, we have a short video of it in action around Germany's famed Nürburgring.
Despite it's three-cylinder, turbocharged gas engine, the i8 sounds pretty angry as it laps the Ring. That is, until it has a little bit of a breakdown. According to the guys that caught the car on video, it appeared the i8 had a minor brake issue, and was parked on the side of the track for a good 15 minutes, with the driver pumping the brakes. We should probably just take this as proof, then, that manufacturers are actually using the Ring for testing, and not just messing about.

BMW shows 670-hp plug-in 5 Series GT concept

BMW quietly revealed a 5 Series GT concept earlier this week at an event in France, and it sports a plug-in hybrid powertrain capable of a whopping 670 horsepower. Think the upcoming Model X crossover from Tesla sounds good? BMW has something that might be just as enticing for eco enthusiasts who like their cars to be green and mean. BMW quietly revealed a 5 Series GT concept earlier this week at an event in France, and it sports a plug-in hybrid powertrain capable of a whopping 670 horsepower. That's right, a hybrid BMW hatch-crossover with more estimated power than the 2015 Chevrolet Corvette Z06. BMW's setup is called "Power eDrive," and it uses a 20-kilowatt-hour lithium-ion battery pack that provides juice for two electric motors; they work with a 2.0-liter turbocharged four-cylinder engine. This 5 Series GT would be able to travel for 62 miles under electric power. The prototype shows the high-performance potential of the system, but the 5 Series GT is "purely a concept," BMW spokesman Julian Arguelles told Autoblog. The GT made its global debut alongside plug-in versions of the 3 Series and X5. They used more basic eDrive systems with one electric motor teamed with a turbo four cylinder. BMW revealed the prototypes to illustrate its plans to increase production of plug-in hybrids. Its goal is to add plug-in variants to all of its "core-brand models," though specifics and timing are unclear. BMW Group Media information 1. BMW Group Innovation Days 2014: New drive technologies. (Introduction) The recently launched BMW i3 and BMW i8 are the first zero-emission vehicles in the premium segment, being designed respectively as dedicated all-electric and plug-in hybrid models. Their BMW eDrive technology promotes hallmark brand driving pleasure, while at the same time delivering major reductions in fuel consumption and CO2 emissions – all the way to zero tailpipe emissions when operating in all-electric mode. This is BMW Efficient Dynamics taken to its logical conclusion. For more than 15 years, the Efficient Dynamics strategy has inspired and shaped the development of new models across all the BMW Group brands, resulting in the development of highly efficient vehicles that combine dynamic performance with intelligent energy management. Today, thanks to Efficient Dynamics, the BMW and MINI brands offer premium models that set benchmarks in their respective segments in terms of their exceptional balance of performance and fuel economy.