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Old 02-16-2012, 04:42 AM   #1
AVANTI R5
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Default 2012 BMW 328i Turbo Four Dyno Video: More HP Than Claimed?

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Dyno videos are usually worth little more than the fire and sound produced by the car as it revs--variability in conditions, equipment, and setup can make translating the results to general terms difficult or impossible. But a new dyno video of the 2012 BMW 328i raises an interesting possibility.

It may have more horsepower than BMW claims. Rated at 240 horsepower and 255 pound-feet or torque from the factory, the new 328i's 2.0-liter turbocharged four-cylinder should put somewhere between 192-204 horsepower to the wheels. But a dyno test by European Auto Source posted to the F30 Post forums shows a 328i laying down 226 horsepower and 230 pound-feet of torque.

Working backwards, that hints at up to 265 horsepower and 270 pound-feet of torque at the crank--in other words, the engine might be underrated by 25 or more horsepower. That's more than 10 percent.

While it's not uncommon for engines to be underrated from the factory, it's a boon to 328i owners and potential owners. It's also a testament to BMW's EfficientDynamics system of technologies, which still manage to extract an impressive EPA rating of 36 mpg from the turbo four. Our real-world testing of the car has backed up those figures.

Of course, this one car could be a freak example of the breed, or the dyno could be mis-calibrated, or any number of other variables could be skewing the results. Having driven the turbo four on track, however, we tend to believe the results. It's a great engine, and well-suited to the 3-Series platform.

http://www.youtube.com/watch?feature...&v=4U_CdQt6Mus
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Old 02-16-2012, 02:03 PM   #2
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BMW is making haste in relegating its normally aspirated inline-six to the dustbin of history. First it was the 528i and Z4 SDrive28i, and now the 2012 BMW 328i has made the transition to a 2.0-liter boosted and direct-injected four-pot known in BMWland as N20.
And it's not like this all-new 3 Series is a smaller car than its straight-six-havin' predecessor. In fact, the 2012 328i casts a larger shadow and weighs just a hair more than the outgoing car. Yet the N20 moves the 328i with ease, perhaps with more ease than its rated values of 240 horsepower and 255 lb-ft of torque suggest.
With that, off to MD Automotive's dyno rollers we go.


You'll notice that the devastatingly handsome speaker in the video said that the 2012 328i's factory rating is 245 horsepower. It is, if you believe the owner's manual, which is where I he found that number.
A brief conversation with BMW afterwards revealed that the numbers in the owner's manual are not correct and that the real rating is indeed 240 horsepower (and 255 lb-ft of torque).
According to our dyno testing, neither set of numbers are correct -- they're all conservative. See here:



That's 240 horsepower and 257 lb-ft of torque as measured at the wheels. It was dead-repeatable on the dyno, too, laying down the same power over nine consecutive pulls.
Like observed with the Z4, there's a dip in the 328i's torque curve at 5300 rpm, less pronounced in the 328i but still present. Also, that hole at 2300 rpm showed up in every pull and I even felt it on the road. It's so low in the rev range, though, that you really have to drive like a clown to elicit it.
And like always, our testing was on 91 octane "premium" fuel. Yes, that's the best we can get in California. Yes, it's lame.



Now, we've previously dynoed the N20-equipped Z4 SDrive28i, rated at a near-identical 240 horsepower and 260 lb-ft of torque. And we found it to be similarly stout, producing nearly as much power as measured at the wheels as is claimed at the flywheel.
The 328i eked out a thin whisker more urge across most of the rev range, but you can probably chalk the difference up to run-to-run and car-to-car (and day-to-day) variation:



Same roll-off of torque at 5000 rpm, same end to the festivities 7000 rpm. The N20 is not an engine that begs to live near the rev limit, but it does generate a fat slug of torque that makes daily driving easier.
And in the 328i, this power delivery makes sense. Less so in the Z4. Sports cars are not sedans, and the engine's character should reflect this.



Another thing you'll notice in the video -- power and torque gauges on the 328i's multimedia screen. I stumbled across the display while poking around iDrive between pulls.
The gauges are in metric, but when you convert the peak numbers, it says it produced 228 horsepower and 251 lb-ft of torque. Not too far off of what we measured at the wheels during that run, actually. The display is a gimmick, but at least it's a somewhat accurate one.
Anyway, yeah, the N20 continues to be strong. I don't think anyone's going to complain about that. The low-gain throttle pedal, maybe. But not the grunt it puts out.
--Jason Kavanagh, Engineering Editor





http://www.youtube.com/watch?feature...&v=pV7xsAFxArA
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Old 02-16-2012, 02:06 PM   #3
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Default First Test: 2012 BMW 328i Sport




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I'll admit it: I didn't like the idea of a turbo-four in a BMW 3 Series. I know it has precedence and all that, but as someone who used to have a poster of an E46 M3 on my wall, to me the inline-six has always been synonymous with the 3 Series. And having driven the X1 with both the four and the six, I didn't think the four-cylinder engine was right for the 3 Series.


I was wrong.



BMW's inline-six is a fantastic engine, and part of what makes it fantastic is its ability -- nay, desire -- to rev to the moon. Wring one out and it will sing to redline and keep right on pulling until you hit the fuel cutoff and have no choice but to shift, even if it seems like the engine could just keep going. The new N20 four-cylinder doesn't do that. In fact, it pretty much falls flat around 6000 rpm, neither gaining or losing power on the rest of the climb to its 7000 rpm redline. To a purist, that's heresy.



Except that it's not. It doesn't ruin the 3 Series. In fact, the new 328i is a blast to drive in any trim, not just Sport. Lest you think that loping off two cylinders has neutered the 3, consider the numbers. Our eight-speed automatic-equipped tester blew through 60 mph in 5.6 seconds and ran down the quarter-mile in 14.2 seconds at 97.8 mph. BMW claims the turbo-four-powered 328i is actually quicker to 60 mph than the infallible E36 M3, which BMW pegs at a slow-by-today's-standards 6 seconds flat. For the record, the last E36 M3 we tested actually hit 60 mph in 5.5 seconds, but that doesn't make the new 328i any less impressive. What's more, the 328i actually pulls slightly higher g's around the skidpad than the E36 M3 at 0.90 g and 0.89 g, respectively. Not bad for the new entry-level car.


The 328i does other things the E36 M3 can't. For example, the 328i is rated at a seriously impressive 24 mpg city and 36 mpg highway. Cruising on the highway at 75-80 mph for 300 miles, our tester returned 30.6 mpg. On a hard-driving, canyon-carving, 150-mile test loop, it managed 16.8 mpg. Now take a look at the E36's numbers: 17 mpg city and 26 mpg highway per the EPA, which you know would be out of reach for us lead-footed journalists. Check out the 2011 328i and you'll see it's only rated for 18 mpg city and 28 mpg highway. And it makes less power. Any way you cut it, this new 328i is some car.



What the numbers don't tell you is just how good it is to drive. There are more than a few cars out there that put down big numbers but aren't all that great to drive. The 328i achieves both. The new electro-hydraulic power steering system reduces vibrations in the wheel and with it some feedback, but still transmits more road information than most cars on the road today. Turn in, and the 328i leans on its optional electronically variable dampers and independent suspension just as you would expect it to. It doesn't flop over or roll in -- it just leans smoothly and quickly, planting its tires on the ground and delivering almost perfectly neutral handling. Really, you'd have to be either the world's worst driver or intentionally trying to upset the chassis to get this car out of sorts. Even with all the nannies fully off, it gives up just a bit of progressive understeer or oversteer, but nothing wild or unexpected. That certainly isn't due to a lack of power, because as we've established, this car has plenty of it and will happily roast the rear tires if you want.


Want to know the real kicker? Don't tell BMW, but the 328i is better than the 335i. I lapped both at Mazda Raceway Laguna Seca during BMW's launch event. We brought both home to test (you'll be seeing the 335i First Test soon), and we all agree. Yes, the 335i is a lot faster thanks to that turbo-six, but the 328i is the better car to drive. The four-cylinder car is 50 pounds lighter in the nose and the engine sits behind the front axle, making for a superb weight balance that the big-engine car just can't match. On the track and on the road, the 335i feels a bit more nose-heavy and a bit looser out back, with the rear end wanting to step out in turns, whereas the 328i is perfectly planted throughout. Sure, the 328i doesn't have the top end speed of the 335i, but it's more rewarding to drive fast. What's more, BMW's own driving instructors at the track confided that the lap times were nearly identical, with the 335i faster on the straights and the 328i faster through the corners.










Then there's the little stuff. The seats are a wonderful combination of comfort and sport. The extra space in both rows, courtesy of the wheelbase stretch, is noticeable and appreciated. The new dash is a fair sight better-looking, and even the base iDrive system sans nav looks like a little flatscreen TV on your dash. The iDrive system continues to improve and now has the ability to read your Facebook and Twitter feeds aloud and even send pre-written tweets and posts while driving. The steering wheel has gone on a bit of a diet and is a more pleasing size, not as chunky and oversized. The full-color head-up display is handy and appreciably hi-res. The car even has a proper hand brake.



At the end of the day, there really isn't anything this car does poorly. However, you do have to consider the price tag. Our tester, despite its reasonable $35,795 starting price, was optioned clear up to $50,870. Ditch a few options like the $3600 Premium Package and its auto-dimming mirrors, moonroof, garage door opener and power seats; or the $950 Premium Sound Package, or the $2550 technology package with nav and head-up display; or the $500 heated seats; or the $900 xenon headlights and so on, and you'll bring that price down without sacrificing any performance. Yeah, they get you with the options, but that's why they're optional. We'll take ours in blue with nothing but performance options, thank you very much.Next Page >>


Read more: http://www.motortrend.com/roadtests/...#ixzz1mZbJEFZd
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Old 02-17-2012, 11:11 AM   #4
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I read these reports yesterday... It makes me want to lease one haha. But ever since I saw the hybrid variant of this car randomly on the freeway, I kind of want to hold out for that one.
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Old 02-17-2012, 12:06 PM   #5
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damn those bimmers are getting too freaking ugly!

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Old 02-17-2012, 12:47 PM   #6
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But they'll still outsell every one of its direct competitors regardless.
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Old 02-17-2012, 01:11 PM   #7
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Originally Posted by boxerinside
damn those bimmers are getting to freaking ungly!
I couldn't disagree more. They had several of the newest 3s on display at the Daytona 24 and I'm glad to say that this is the best looking 3 since the e36.
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Old 02-17-2012, 06:51 PM   #8
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Very appealing car. Hopefully the reliability is good. The options are ridiculous in typical BMW fashion.
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Old 02-17-2012, 07:55 PM   #9
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Wait, does North America get this motor?
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Old 02-17-2012, 08:01 PM   #10
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Originally Posted by BlaineWasHere View Post
Wait, does North America get this motor?
Haha seriously? It's still the 328i. It's what they're replacing the 3.0-liter with in that same car (as downsizing has been the trend, like the 550i having switched from a 4.8-liter V-8 to a 4.4-liter twin-turbo V-8), though I think it's already in the Z4 here.
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Old 02-17-2012, 09:22 PM   #11
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Originally Posted by DeeezNuuuts83 View Post
Haha seriously? It's still the 328i. It's what they're replacing the 3.0-liter with in that same car (as downsizing has been the trend, like the 550i having switched from a 4.8-liter V-8 to a 4.4-liter twin-turbo V-8), though I think it's already in the Z4 here.
Yeah seriously, the E9x had many motor options we never saw in North America... Kinda like the Golf, in Europe you can get 2 different TDi options and they used to have a 1.4 with a super and turbo charger... Sometimes all the creativity and the good stuff never makes it on the boat.
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Old 02-17-2012, 09:45 PM   #12
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Originally Posted by BlaineWasHere View Post
Yeah seriously, the E9x had many motor options we never saw in North America... Kinda like the Golf, in Europe you can get 2 different TDi options and they used to have a 1.4 with a super and turbo charger... Sometimes all the creativity and the good stuff never makes it on the boat.
Right, but those motors were in models that we didn't get in that platform, like the 323i and such. But this new motor has always been mentioned as the powerplant for the 328i, which we most certainly get.
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Old 02-18-2012, 04:01 AM   #13
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I couldn't disagree more. They had several of the newest 3s on display at the Daytona 24 and I'm glad to say that this is the best looking 3 since the e36.
If the Xi was available now it would be in my garage, not till fall 2012.. So I got the A4..
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Old 02-20-2012, 12:12 PM   #14
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