Login

Post Reply 

Thread Tools  Search this Thread 
06232011, 03:39 AM  #45  
Captain
261
Rep 826
Posts 
Quote:
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.
__________________
3 series: E30: 89 325i, E36: 92 325iC, 94 320iC, 96 320i Convertible, 94 320iaC, E46: 99 320ia, E90: 06 318i Le mans, E91: 07 318dt
5 series: E39: 97 520ia, 01 530Dat, E61: 09 520Dat X series: E83 05 X3 2.0d, E84 10' X1 2.0 Xdrive DA, F25 13' 2.0da Xdrive. 

Appreciate
0

06232011, 04:05 AM  #47 
Not a BMW Insider
8
Rep 301
Posts 
"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. 
Appreciate
0

06232011, 04:21 AM  #48 
Lieutenant
55
Rep 495
Posts 
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.

Appreciate
0

06232011, 07:16 AM  #50  
D to the X to the B!
176
Rep 2,109
Posts 
Quote:
22psi is just the peak. PS, turbo engines are always underrated but anyway, 560hp ain't bad at all
__________________
11 corvette C6


Appreciate
0

06232011, 07:52 AM  #51 
Banned
23
Rep 2,411
Posts 

Appreciate
0

06232011, 09:04 AM  #53  
Lieutenant
26
Rep 587
Posts 
Quote:


Appreciate
0

06232011, 09:18 AM  #54  
Everything's Bigger in Texas!
699
Rep 3,308
Posts 
Quote:
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? 

Appreciate
0

06232011, 09:21 AM  #55 
Everything's Bigger in Texas!
699
Rep 3,308
Posts 

Appreciate
0

06232011, 09:37 AM  #56 
Banned
256
Rep 1,235
Posts 

Appreciate
0

06232011, 09:53 AM  #57  
Lieutenant
5
Rep 491
Posts 
Quote:
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. 

Appreciate
0

06232011, 10:06 AM  #58 
Colonel
9
Rep 2,292
Posts 
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.

Appreciate
0

06232011, 10:10 AM  #59  
Private First Class
18
Rep 138
Posts 
Quote:
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. 

Appreciate
0

06232011, 10:12 AM  #60  
Moderator
3859
Rep 17,386
Posts 
Quote:
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.
__________________
A genuine BMW effeightzero with them tandem clutches in the transmission and that dad gum sun roof on the topa da cawr.


Appreciate
0

06232011, 10:28 AM  #61 
Second Lieutenant
31
Rep 293
Posts 
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?
__________________
2006 M3: Individual Blue Onyx on Black. MT

Appreciate
0

06232011, 11:24 AM  #62 
Brigadier General
169
Rep 3,237
Posts 
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.
__________________

Appreciate
0

06232011, 11:25 AM  #63 
Colonel
313
Rep 2,331
Posts
Drives: '08 135i, '88 325is
Join Date: Feb 2008
Location: Denver, CO

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.
__________________
Delivered in Munich, broken in on the Nurburgring.

Appreciate
0

06232011, 12:08 PM  #64 
Captain
28
Rep 910
Posts 
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
__________________
E90 M3: Some cool stuff...more to come
Ducati 1199 Panigale: Bucket full of mods 
Appreciate
0

06232011, 12:43 PM  #65  
Private First Class
18
Rep 138
Posts 
Quote:
EXACTLY 

Appreciate
0

06232011, 12:48 PM  #66  
Captain
28
Rep 910
Posts 
Quote:
__________________
E90 M3: Some cool stuff...more to come
Ducati 1199 Panigale: Bucket full of mods 

Appreciate
0

Post Reply 
Bookmarks 
Thread Tools  Search this Thread 

