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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.

BMW M4 Coupe laps 'Ring in 7:52, bests outgoing M3

Comparing Nürburgring Nordschleife lap times is a bit of a black art, especially when looking at times officially set by manufacturers matched against other sources. Driver skill and weather conditions play a huge roll in determining a quality time. Still, it appears BMW fans have reason to celebrate because the new M4 Coupe beat the previous-generation M3 by 13 seconds in a recent test by Germany's Sport Auto magazine.
Sport Auto conducts what it calls the Supertest, where it runs performance cars around the 'Ring and the short course at Hockenheim to create its own database of comparable times. The M4 with a dual-clutch transmission, ceramic brakes and Michelin Pilot Supersport tires managed a quality 7 minutes 52 second lap around the 12.8-mile course, compared to 8:05 from the last M3, according to BimmerPost. The new coupe also beat the magazine's posted times for the Audi RS5 Coupe, which did it in 7:59, and Mercedes-Benz C63 AMG with an 8:01, but couldn't quite match the 7:44 set by a 911 Carrera S. Still, BMW must be somewhat pleased with these results of its new 425-horsepower coupe because it posted the magazine's cover and an image of the time on its official M Facebook page.
While the M4 apparently stands up to contemporaries and predecessors, new generations of the AMG and RS models are reportedly on the horizon. In other words, more tests will come.

BMW adds on-street parking to DriveNow carsharing in SF

BMW is putting a new spin on the concept of the San Francisco treat. The German automaker cut a deal to clear out 80 street-parking spaces for its DriveNow car-sharing program in the notoriously parking-constrained City by the Bay. Bimmer is also more than doubling its all-electric ActiveE car-sharing fleet in San Francisco to 150 vehicles from 70. Starting later this month, customers will be able to access the DriveNow website or app to find, reserve and park the electric Bimmers on certain streets in San Francisco's Mission district. Once the car is ready to be turned back in, the vehicle's in-car screen will also indicate what "drop-off" zones the driver can use to end the reservation. It's all very high-tech, and BMW is looking to expand the program to other San Francisco neighborhoods like Bernal Heights, the Haight, Noe Valley and Potrero Hill. There's also a contest for users to name the 80 new vehicles, but it involves a really complicated lettering system. "New" here means new to DriveNow, since these ActiveE electric vehicles are really those that were, until recently, used by the Electronauts in BMW's EV leasing program. Since those leases are ending, the cars need to go somewhere. We think carsharing is a great home for them. BMW, which also runs DriveNow in the German cities of Berlin, Hamburg, Cologne, Munich and Dusseldorf, said in March that it was looking to add the service to as many as 15 more cities in Europe as well as another 10 in the US. BMW debuted DriveNow in San Francisco in August 2012, though parking the cars has always been an issue. Check out BMW's press release below. BMW Group's DriveNow Car-Sharing Service Expands to Street Parking in San Francisco. San Francisco Mayor Ed Lee and BMW Group board member Dr. Ian Robertson provided details about DriveNow at a news conference on ... Eighty All-Electric BMW ActiveE Vehicles Added to the DriveNow Fleet to Increase the Convenience of Finding and Parking Emission-Free Cars. San Francisco, CA – May 8, 2014... BMW Group subsidiary DriveNow, a flexible, premium car-sharing program, will expand to offer street parking in multiple neighborhoods in San Francisco, beginning in select areas of the Mission District and will add 80 electric BMW ActiveE vehicles to the existing fleet, increasing the total number of ActiveE vehicles in the San Francisco Bay Area to 150. DriveNow members will have the opportunity to name the 80 electric vehicles in a two-week social media challenge.