02-01-2012, 11:52 AM | #23 |
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The exhaust manifold feeds the two small turbos and they in turn feed the large turbo.
Here's how I envision this working.... Full throttle throughout. From idle, the small turbo wastegates close, VTG goes to minimum diameter, and the small turbos spool up and provide boost. The large turbo's wastegate is fully open to avoid restricting the small turbos. As the revs rise, the small turbo's VTG starts to increase it's diameter to maintain the proper turbine speed. Large turbo still not engaged at all. At the point where the small turbos run out of breath, the large turbo's wastegate closes and it's VTG goes to minimum diameter. Small turbos wastegates begin to open. Large turbo is up to speed and as it's boost pressure rises, the small turbos wastegates open fully to preserve the exhaust's energy for the large turbo and to cease providing boost to the engine. Towards redline, the large turbo increases it's VTG diameter to maintain proper turbine speed. |
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02-01-2012, 12:55 PM | #24 | |
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However... ...Diesel in an M car? Sure. Why? Well... BMW was the first manufacturer to win a major 24h race with a diesel. LONG before Audi ever woke up. A 1er diesel won the worlds hardest endurance championship. In Germany, there are a number of successful rallye and race diesel BMWs. Are these cars fun to drive? Sure they are. And fast. Back in the days that I had my M346, I used to state, that I would have loved THAT car (including the SMG) with a 3L TT diesel. I just wouldn't want that big and heavy of an engine as the 50d in a 1M shell. Correct the balance a little (i.e. by using a transaxle gearbox, which would work better in a diesel anyhow) and a diesel can power a seriously fast fun car without problems. There is just one single country in the world that is yet to understand that.
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02-01-2012, 01:29 PM | #25 | |
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Here is the PS(HP) and Torque curves... Displacement: 2,993 cc, output: 280 kW/381 hp at 4,000 – 4,400 rpm, max. torque: 740 Nm (546 lb-ft) at 2,000 – 3 000 rpm, and here is BMW AG's press document on the new M_Performance sport line diesels. Sorry its only available in German(so far). Be sure to check out pages 42 and 36 for the M550d engine specs. Die_BMW_M_Performance_Automobile.pdf |
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02-01-2012, 01:34 PM | #26 |
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So it will redline about 4800 rpms it looks like? Pretty impressive. I think my diesel truck revs to something like 3200. I wonder what the highest reving production deisel out there is?
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02-01-2012, 01:48 PM | #27 |
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The rev-range is nothing spectacular. The Citroen CX (1977 through 89 - off the top of my head) already almost reached these revs (4.500rpm max). Over 30 years ago.
I would assume, that one of the 'downsized' 3-cylinder engines will be the ones with the highest revs.
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02-01-2012, 10:33 PM | #28 | |
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02-05-2012, 04:11 PM | #29 | |
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Hello, I am the owner from dieselspeed. The E46 Diesel on the picture, its my car. We drive with the 535d Engine (272HP) with 374HP and 750 Torque. Does you have questions, I will help you. Sorry for my English. Günter |
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02-06-2012, 02:57 AM | #30 |
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Ich weiss Günter. Ich hab Euren Autos in der VLN schon ab und zu mal mit meinem 325 im Weg rumgestanden.
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02-06-2012, 01:54 PM | #31 | |
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Du hast uns im Weg gestanden? Glaube ich nicht, ich kann mich an niemanden erinnern der uns im Weg gestanden ist. Wenn wir schneller waren, sind wir vorbei gefahren. Wer bist Du denn? Gruß Günter |
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02-07-2012, 01:55 AM | #32 |
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@Günter: Peter. 325, V4, "Prinzessin Lillifee", ehemals Startnummer 555. Diese Saison wieder am Ring, allerdings in der RCN.
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02-07-2012, 12:23 PM | #33 |
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02-28-2012, 02:38 AM | #34 | ||
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Idle-1500rpm: basically single VNT turbo operation (right one) Inlet air always flows through the large turbo compressor. 1500-2700rpm: exhaust gasses are going to the large (non-VNT) turbos turbine, adding boost to the small 1st turbo already working untill it saturates 2700-5400rpm: the second VNT turbo comes in to take the flow from the large compressor, and from here on all three turbo's sing to 5400rpm (previous biturbos only had the large one going once the small turbo saturated and was cut out). Two VNT's in the small turbos secure excellent throttle response. Also, it seems this engine uses a top mounted water cooled IC, so no piping to the front, less volume, less flex, higher efficiency and therefore excellent response (alike the F10 M5). What an engine Oh and on the X-drive: apparently BMW did their best to make it handle predictably with a very clear rwd bias... (Did I mention I want a M150d?) |
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02-28-2012, 08:37 AM | #35 |
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Terrible idea in my opinion - let's make the car heavier and understeering so it can beat a couple of audi's in a straight line sprint from a dig? I pass.
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