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AC Schnitzer's hotrod BMW 318ti remembered by MotorWeek

There are plenty of compact luxury cars available in the US today, including the Audi A3, BMW 2 Series, and Mercedes-Benz CLA-Class. In the '90s, the BMW 318ti tried to offer a similar mix of luxury at a reasonable price, but it never quite found much success in America. The 318ti looked like an E36-generation 3 Series in front but featured a stumpy liftback at the rear. The only engine available in the US was a four-cylinder. If you had the money, though, the aftermarket was ready to give you more power and more aggressive looks. AC Schnitzer dropped a bored and stroked 3.0-liter inline-six under the hood to create a pocket-sized hot rod, and MotorWeek took it for a drive. The model in this video was the promo car for AC Schnitzer's US importer, and it had every upgrade possible to show off what the German tuner's produced. Under the hood, the company installed an upgraded engine with 241 horsepower and 228 pound-feet of torque. For comparison, a US-spec M3 of the era had 240 horsepower and either 225 or 236 lb-ft, depending on the model year. AC Schnitzer also sharpened the 318ti with a suspension overhaul and short shifter. According to MotorWeek's tests, the mods got the hatchback to 60 miles per hour in 6 seconds and gave 318ti laudable handling. So much performance wasn't cheap, though. The upgrades on the promo car cost more than twice as much as the 318ti's base price. Watch this Retro Review to find out the massive amount you needed to pay to get M3 performance in a tiny package. Related Video:

Next BMW 4 Series convertible may ditch folding hardtop

In 2007 the E93 BMW 3 Series convertible switched from a fabric roof to a folding hardtop, but reports out of Germany and BMW say that the next-generation 4 Series convertible will go back to a fabric roof. AutoBild disclosed that nugget last month, now BMW Blog says a BMW source told their sister German publication BimmerToday that it's official and "a decision has already been made." The official car of pro tennis clubs around the world, the droptop 4 Series isn't due in dealers until 2020 or 2021 so one would think there remains some leeway about the top. However, teams of designers are working on the new car right now, so it's entirely possible that a design course is fixed. From the time that the model made the switch, fabric roofs have got so good that there is barely, if any, penalty for using them. It's supposed the change is being made to save weight and free up space. The next 4 Series range is aiming for a lot more sportiness, so on top of its CLAR (cluster architecture) body, it's expected to get active steering, adjustable dampers and anti-roll bars, bigger brakes, and brake-based torque vectoring. Detail improvements like reduced-friction wheel bearings, and faster torque transfer for its all-wheel-drive system are on the long list of upgrades. So too are aluminum and carbon fiber wheels, which will likely be developments based on the carbon wheels BMW showed off last year. Driver assistance options will be legion, with remote-controlled parking, semi-autonomous driving up to 40 mph, and hands-free overtaking perhaps among them.

BMW reveals M4 safety car with innovating water injection system [w/video]

Racing series don't just pick their safety cars at random, or use just whatever car is lying around. These days the car that sets the pace at the front of the pack is typically provided through consideration by a sponsor. In the MotoGP series, that's BMW and its M division, which have served up the Official Car of MotoGP since 1999. What you're looking at is the latest, and it packs some innovative technology on board. Aside from the matte black wrap with BMW's iconic striped livery, upgraded aero kit, retrofitted interior and emergency equipment, this BMW M4 coupe packs a new injection system under the hood. Only instead of injecting fuel, it injects water into the combustion chamber – something that wouldn't usually be recommended, but BMW insists actually aids in the combustion process. The idea is that the temperature of the air being mixed with the fuel inside the engine is usually hotter than ideal, so the system injects a fine mist of water into the collector in order to reduce the air's temperature... sort of like one of those hydrating misters at an amusement park or outdoor mall, but in an even hotter environment. The system brings the temperature of the air down to a more optimal temperature, helping it combust better. The process is said to yield a number of positive effects. For one, it reduces knocking. For another, it can make more out of lower-octane fuel where higher octane isn't available. It also can control the adverse effects of higher ambient temperature on the combustion process. But most of all, it increases output and reduce fuel consumption by around eight percent. Whether that eight percent is worth the added weight of the system – particularly with water pump and a 1.3-gallon tank in the trunk – is up for debate. But we'd imagine that the Bavarian engineers have weighed very carefully. Of course there's also the matter of refilling the water tank, which BMW says would be carried out whenever the safety car is refueled, but in real-world conditions would only necessitate attention once every five top-ups at the gas station. By now you might have guessed that BMW probably didn't develop this system just for the MotoGP safety car, and isn't planning on keeping it confined to the racetrack. Instead it's being tested and demonstrated on the safety car before being rolled out on production models in the future.