09-07-2010, 12:41 PM | #89 | |
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if you look at your example, the spacing between 1 and 5 is fine, but the spacing between 5 and 1 isnt. they're too close together. is 2 twin scroll possible? yes of course. is it worth it? i dont think so... |
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09-07-2010, 01:45 PM | #90 |
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It seems possible to have a twin scroll setup on a 3 cylinders engine (cf url)
http://www.bimmerfile.com/2010/05/12...linder-driven/ But i would rather than BMW will not spend money and add weight on the car. They will add there CCM + the Turbo from the N55 for a weight gain of 20-25kg. Maybe carry over the injectors and HPP from the N55. The rest will be carry over from the N54 (maybe a change in the cam timing aswell) And then that sound like a new S54 engine for me PS : Or at least i hope so ... edit : another example use by audi for the twin scroll on uneven number of cylinder (aka TT RS) => Twin-scroll turbos are ideal for inline fours but the odd number of cylinders precludes it here. Instead, the engineers designed the manifold so that the feed from cylinder number three is kept apart from the others until it enters the turbine housing volute.
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Last edited by MinusS50; 09-07-2010 at 01:52 PM.. |
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09-07-2010, 06:01 PM | #91 |
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Ok so why wouldn't the exhaust manifold have a trick flap that is controlled by a solenoid that is connected to the cams and ecu to alternate the 3rd pulse back and forth between firing cycles? I am mechanically and engineerically challenged but wouldn't that be an option? Wouldn't fill the trick manifold as well? or maybe ^ all that but for the intake side? Just wondering?
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09-07-2010, 07:10 PM | #92 |
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A fascinating discussion on multi scroll turbine housings.
We're so fortunate that BMW has given M Division carte-blanche to go ahead and come up with the most technologically advanced inline turbo six yet, years ahead of the current status-quo, time and researchdollars no object, and we eagerly await the fruits of those developments!!!!! Such a tour-de-force piece of machinery will surely completely shame the 330hp the N54 is currently tuned to in it's Z4 version. Surely we're talking the first 550hp production 3 liter! Oooops, I think I just woke up...... |
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09-07-2010, 07:55 PM | #93 | |
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09-07-2010, 09:37 PM | #94 | ||
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09-08-2010, 12:37 AM | #95 | |
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09-08-2010, 03:07 PM | #96 |
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I was talking with the guys at my local BMW dealership. Their comments were that the 1M Coupe, will come in at 340 HP, and that the gearing (presumably the gearbox and rear end) will be tuned to maximize performance characteristics. With what is already known, about the engine, and car only having a manual transmission, this would not be a surprise to me.
I think people that are looking for a 360+ HP car may well be disappointed. I have a feeling this will still be an exciting car to drive.
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