09-11-2009, 04:18 PM | #45 | |
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That was all I was questioning. |
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09-12-2009, 07:54 AM | #48 |
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09-12-2009, 08:12 AM | #49 |
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The N55 has 1 Variable Turbo, being dubbed the Twin-Power, because of it's Duel Function.
The N54 [Twin-Turbo] will be replaced by the N55 [SINGLE Twin-Power TURBO] because of the fuel saving it is capable of. The new series of High-Revving Turbo 4 Bangers, most likely will see the same Twin-Power Single Turbo application. The 2011 X3 being built on the up and coming 2012 3er Platform, may indeed see the first application of the new N55 Motor. |
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09-12-2009, 10:22 AM | #50 | |
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Semantics? You decide. |
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09-12-2009, 11:18 AM | #51 | |
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The Twin-Power turbo is basically the same turbo that's used on the V8 - it's a twin scroll (two chamber) on the exhaust side. So rather than an exhaust pulse arriving every 240 degrees of crank rotation (as on the individual turbos of the N54) an exhaust pulse arrives every 120 degrees of crank rotation. That allows peak /RPM/ should read torque/ to occur at 1200 RPM, so it is less 'lagy' then the N54. The Valvetronic allows the engine to go 'throttleless' after startup, that's where the fuel savings comes in. Last edited by atr_hugo; 09-12-2009 at 09:36 PM.. Reason: Clean up spelling in aisle three. ; -) |
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09-12-2009, 01:41 PM | #52 | |
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It is not a variable vane. It is two chambered.
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09-12-2009, 09:04 PM | #55 | |
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Of course they can always sell more cars making people think it is a twin-turbo by saying it is a "Twin-Power" turbo motor. |
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09-13-2009, 08:28 AM | #57 | |
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Get this... I was told this yesterday by a close friend of mine, returning from a trip to the BMW plant in Munich, that a new high revving 4 cylinder in development may have 3 Turbos.
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09-14-2009, 10:15 PM | #58 | |
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Same goes for this whole "Joy" campaign (which I think is lame) is not from BMWNA- and will not be.
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09-14-2009, 10:21 PM | #59 | |
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If your friend had a behind the scenes tour, that is a different story. BMW is trying to get the most power and efficiency out of the least fuel, so anything is fair game. A tri-turbo makes sense as one can supply the engine with air at higher RPMS- in gas to keep it going and diesel to raise the red line. The big down fall is expense and weight. BMW eliminated a turbo on the N54 to create the N55 to save money without losing performance, so the idea of the 3 turbos has always left me a bit puzzled in the grand scheme. A turbo and super charger (with a electromechanical clutch) makes more sense to me from a cost and design concept. -M
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09-14-2009, 11:12 PM | #60 |
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09-14-2009, 11:13 PM | #61 | |
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09-15-2009, 01:49 PM | #63 |
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^^ Ye, its false information. Only application of tri-turbo that I heard of is on a new super diesel V6... Turbo per 2 cylinders, as it would make sense..
3 turbos on a 4 banger - doesnt make sense.. |
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09-15-2009, 10:31 PM | #64 | |
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I'm intrigued by the concept as a whole, and will definitely post more after my lunch meeting later this week. I love high revving fours, and think they can show Honda a thing or two, in the process. |
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09-16-2009, 12:29 AM | #65 | |
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If anything, Honda could show BMW a thing or two.
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09-16-2009, 05:52 AM | #66 | |
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Didn't you tubo-charge both of your Hondas prior to the 1er? |
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