this year, we reported that BMW's normally aspirated inline-6 engines will
be ushered out and replaced by a new family of turbocharged four-cylinder
engines. BMW today
confirmed that four-cylinder power would return to U.S.-bound BMWs after a
10+ year absence.
The first model to get BMW's new 2.0-liter
TwinPower Turbo four-cylinder engine will be the Z4 sDrive28i Roadster (say
that five times fast). The engine develops 240 hp and 260 lb-ft of torque (30
percent more torque at 1,500 fewer RPMs than the naturally aspirated 3.0-liter
BMW says that the new turbo four will be 20
percent more fuel efficient than the inline-6 when paired with the 8-speed
automatic transmission. We're sure that there are fuel efficiency gains to be
made with the 6-speed manual transmission as well, but it's likely nowhere near
20 percent (or else BMW would have mentioned it in the press release).
The Z4 sDrive28i Roadster will arrive in showrooms this fall, and
the turbo four will likely filter down to other BMW models soon after.
quote: Yes, but many "required" engines still reduce the timing. Early ones probably just reduced ignition timing, but newer ones probably have a mix of that and alternate fuel maps.
quote: But this link claims that RON and PON, the American method, has basically the same octane rating.
quote: And to whatever idiot is rating me down, ask yourself why every manufacturer of a turbo car says "Premium fuel REQUIRED" in the manual.
quote: According to Hyundai engineers, putting premium in it will give you no more power.
quote: The only thing I can think of is they are running very low compression with very little boost.
quote: That being said, I'm gonna just say that their powertrain engineers know a lot more about this than you or me
quote: Everyone must deal with guilt by association. However, it seemed that way, with or without your signature.
quote: A friend just got a new Hyundai. IE a brand new replacement under the Lemon Law. 8 out of 30 months in the shop, it was last waiting for it's 4th transmission. Typical dealer inventory does not include whole transmissions. (They should have considered they're dealing with a symptom and not a cause by now.)
quote: Years later the engines idled accordingly.
quote: lumped you into with the crowd.
quote: Maximum output of 240 horsepower is achieved at 5,000 rpm, 1,500 rpm lower than in the normally-aspirated 3.0-liter inline six. The peak torque of 260 lb-ft comes on stream at just 1,250 rpm.
quote: I hope you can still cruise off-boost though, as that to me is the key reason for turbo power over normal aspiration.
quote: Average joes can't afford BMWs, this is a richman's car.
quote: this motor looks to be an order of magnitude better.
quote: Its trading down refinement to cut costs...and this isn't going to result in a price decrease
quote: Taxes based on displacement, common everywhere but the US, encouraged small high-revving engines.
quote: Did Porsche make a 2 liter flat 6 in one of their 914 models decades ago?
quote: And you didn't even ask.
quote: Shit my Dad's old El Camino used to get 25mpg towing a 3000lb boat!!"
quote: I think it went south earlier in the 00's when they moved the 2.5L to 2.8L and then moved model number up, but refused to move the model number up on the 323i even though it went to 2.5L.
quote: Good to see that BMW now has a turbo-4 with sligthly less power than an Ecotec of 4-5 years ago.