08-31-2010, 01:40 PM | #1 |
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1M to use twin turbo N54 - or so tell these pictures
Following Bimmerfile's report and Scott's confirmation, I thought it might be worth to have another look at this picture M3roar brought up:
It's hard to see in this picture, but the 1M's exhaust system appears to have center cats in the mid section. Here's a better picture of this: Zooming into the center cats section (center cats section enhanced for more clarity): In case you guys are wondering why I'm stressing this, the same center cats in the midpipes appear on the N54 powered 135i (one on each exhaust pipe, marked with a red arrow each): The N55 powered 135i however doesn't have these center cats as you can see in these pictures, courtesy of black e (see here). Again, the red arrows show where the mid cats would be on the N54 powered 135i: Hence, I'd say it's not only safe to assume that Bimmerfile's correct on the N54 being used in the 1M, it's also safe to assume that there won't be any change to the turbo layout, i.e. it will keep the N54's (single scroll) bi-turbo. That being said, I have no idea what Scott could have meant then by saying the 1M engine would be a hybrid between N54 and N55. Any thoughts (or corrections for that matter)? Best regards, south
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08-31-2010, 01:59 PM | #3 |
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Didnt scott mention early on about a "trick manifold"??? this is the only place where i could see something new and cool in this engine. perhaps a 6-1-2 or 6-2 tubular equal length manifold of some sort? looking at pics of the N55 manifold, you can definitely see that its a mass production design...
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08-31-2010, 02:07 PM | #4 |
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Is there a reason that the N55 doesn't have the second set of cats??
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08-31-2010, 02:16 PM | #5 |
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Did SCOTT specifically say it would be a 'hybrid' between the N54 and N55? I didn't remember he specified those two engines. Is a 'hybrid' between the N54 and something else possible?
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08-31-2010, 02:18 PM | #6 | ||
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I also tried to figure out what Scotts two posts about the engine/powertrain beeing a hybrid could mean:
Quote:
Quote:
Still trying to figure out how it's possible to feed the 4 intakes of 2 twin-scroll chargers from 6 cylinders ... |
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08-31-2010, 02:19 PM | #7 | |
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Quote:
Best regards, south
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08-31-2010, 02:23 PM | #8 |
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08-31-2010, 02:26 PM | #9 |
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08-31-2010, 02:32 PM | #11 |
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I did read a while back that BMW was working on a quad turbo 4cl. Could they have slapped more turbos on the 6 or maybe how about twin sequential, taking the turbo off the N55 and adding another (one N55 turbo on each side).
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08-31-2010, 02:34 PM | #12 |
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This Wikipedia article about Variable Geometry Turbochargers is worth reading. Especially the first section that mentions the problem of exhaust pressure at high rpm ...
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08-31-2010, 02:36 PM | #13 |
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The 1M will surely have a modified air intake compared to the regular N54, because the Z4 35is also has this in order to produce 340hp. But is this enough to use "hybrid" ? I don't think so...
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08-31-2010, 02:37 PM | #14 |
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I'm betting it's going to be a standard N54 single scroll, twin turbo, but with better cooling (larger center intercooler and maybe an additional engine bay one, plus an oil cooler), and a new special intake system like the one used on the X6M. Those changes in addition to the remapped software would likely net the ~345 hp that's been suggested. Right?
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08-31-2010, 02:44 PM | #15 |
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I don't see why they would revert back to the N54. They have put so much into the development of the N55 and have discussed using it in other future vehicles. Theoretically in our 135's N55 produces the same BHP and Torque as the N54. I think it would be easier to make the reliable power gains that should be necessary to put an M badge by using the N55. Just my thought.
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08-31-2010, 02:48 PM | #16 |
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I spoke while before the 1M was confirmed with some BMW insiders/experts and they said that the n54 engine was very likely designed by m gmbh because of its complexity and it was a come back to turbo engines for bmw after a while so they invested quite heavily into it to make sure its a good one (didn't want to fail at this attempt)
So I would assume M gmbh used this engine again as a basis for the 1M The N55 as I was told is not as good as the N54 and represents cost cutting for mass production engine from BMW. Just the thought
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08-31-2010, 02:58 PM | #17 | |
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1M Hybrid engine... logical hypothesis
Could it be between an N54, and turbos from BMW turbo diesel engines?
Technically if it's still twin turbo (since we saw exhaust pipes from the pictures), then it would only make sense to go either - variable vane or - different size so that top end power isn't shot due to the small snails unable to provide sufficient air..... which comes to this page: This is from bmw tech guide Quote:
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08-31-2010, 03:13 PM | #18 | |
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Maybe because this is going to be a short production run and the N55 will be reserved for the upcoming M3? |
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08-31-2010, 03:34 PM | #20 | |
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Quote:
M also takes into account the requirement for longevity etc..
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08-31-2010, 03:51 PM | #21 | |
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Quote:
He did confirm though that the N55 is still slated to be the basis for the F30 M3....
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