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06232011, 03:39 AM  #45  
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These numbers shows that BMW have been pretty modest about theyr output numbers of this new engine, it's a beast allright! In fact, i'll declaire a prediction right now people, i'll bet my left nut this engine wins next years award as the engine of the year.
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06232011, 04:05 AM  #47 
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"VALVETRONIC has also sharpened the responsiveness of this engine compared to the V10 engine it replaces."
Surprised no one has mentioned this yet. Seems like they're claiming this FI engine will be more responsive to throttle inputs than the NA engine it's replacing. 
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06232011, 04:21 AM  #48 
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I'm creaming myself at the thought of the F3x M3 engine that is coming after seeing what BMW is doing here. I MUST take this car for a test drive.

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06232011, 07:16 AM  #50  
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22psi is just the peak. PS, turbo engines are always underrated but anyway, 560hp ain't bad at all
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06232011, 07:52 AM  #51 
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06232011, 09:04 AM  #53  
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06232011, 09:18 AM  #54  
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1.0 Bar is 14.5 psi, or normal atmospheric pressure. But "gauge" pressure measures what you are speaking of: pressure above the surrounding atmosphere. Boost pressures for engines are typically given in "gauge" pressure not "absolute". So you are correct in that the actual pressure in the intake tract is 2.5 bar, but "gauge" pressure is 1.5 bar. Good reading here including a handy diagram, which I like: http://www.engineeringtoolbox.com/pressured_587.html By the way, not sure why everyone is so hung up about the bar thing. It's just another system of pressure measurement. Certainly people are familiar with converting NM to ftlbs for torque and kW to HP for power, no? 

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06232011, 09:21 AM  #55 
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06232011, 09:37 AM  #56 
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06232011, 09:53 AM  #57  
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It's economies of scale. If this engine architecture turns out to have great realworld reliability, all they'll have to do in 35 years is bump up the boost/tuning to keep up with the competition. If they can just play that game to keep in the HP wars that means they'll get a lot of years out of this basic engine architecture, which means a lot of design/construction savings down the road. It also means they'll have that much longer to design and test its eventual replacement. A much better path financially than building the motor at peak power now and having to completely redesign in to 35 years to keep up with the competition. 

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06232011, 10:06 AM  #58 
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Something's not right with the numbers, if the engine is truly running at 22 pounds, then it should be making a lot more power. The N54 which is only a straight six with much tinier turbos puts down like 440 at 17 lol.

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06232011, 10:10 AM  #59  
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That is why I originally stated that 1.5 bar might only equate to 8 psi. BMW specified on page 1 that their 1.5 bar measurement was absolute pressure (which includes atmospheric), not gauge. Gauge pressure is signified by a ‘g’ after the pressure unit e.g. 30 psi g, this indicates that the pressure measured is the total pressure minus atmospheric pressure. Absolute includes atmospheric pressure, so you have to subtract 14.7 psi from the 22. Given that the N54 platform only pushes 9 psi, I would be surprised if BMW came out with an engine that pushes 22 psi stock. Last edited by dcafs; 06232011 at 11:05 AM. 

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06232011, 10:12 AM  #60  
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And an 84mm to (at most) 86mm bore. And a 90mm stroke. And, hopefully, a higher (7500RPM+) redline. Other than that though, yep, absolutely identical.
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06232011, 10:28 AM  #61 
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When you turbo a Vette' don't they only push like 8 psi??
What's at play here, any clue? The size of the turbos?
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06232011, 11:24 AM  #62 
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That's incorrect. They clearly state "absolute pressure". So it's not 22psi relative to atmospheric pressure, but absolute psi. So substract 14.7 which means 7.3psi relative pressure. Which makes sense for a lagfree motor with small turbos producing this kind of power from a 4.4l engine.
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06232011, 11:25 AM  #63 
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No, because they are twin scroll turbos. However, the N55 does use one twin scroll turbo, so in theory, you could bolt one of those turbos onto that engine.
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06232011, 12:08 PM  #64 
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Dear BMW,
Thank you for thinking about my future insurance costs when you published the wheel horsepower of my next car, the M5, instead of the crank horsepower. Yours truly, The BMW Community
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06232011, 12:43 PM  #65  
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EXACTLY 

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06232011, 12:48 PM  #66  
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