Twin Scroll Sceptics BMW X5 M owns you....
Twin Scroll Sceptics BMW X5 M owns you....
The first modern turbocharged M engine: twin scroll twin turbo technology with a patented exhaust manifold.
Using BMW's innovative, 4.4L reverse-flow V8 engine with High Precision Direct Injection and twin turbochargers as a basis, the new M engine introduces twin-scroll twin turbochargers and patented exhaust manifold technologies to achieve outstanding thrust and pulling force, while preserving the most compact dimensions possible. Two low-mass twin-scroll turbochargers are positioned together with the catalytic converters in the "V" section between the two banks of cylinders. By reversing the flow of gases through the engine from traditional arrangements, the intake and exhaust ducts are shortened and widened. The result is that pressure losses on the exhaust side are minimized.
The goals: virtually eliminate turbocharger lag while maximizing combustion efficiency and power output. Tremendous power and performance are delivered by the engine in the BMW X5 M and BMW X6 M through a new design and construction principle. The new M V8 engine with twin-scroll twin turbo technology uses a single exhaust manifold with tuned-length runners, incorporating both cylinder banks and connecting cylinders in carefully-selected pairs. This configuration, patented by BMW M and known as Cylinder-bank Comprehensive Manifold (CCM), offers lightning-quick response, a linear build-up of engine power, and a broad, consistent torque curve by feeding each of the twin turbochargers with a "charge pulse" at approximately every 90 degrees of crankshaft rotation, rather than the more traditional "irregular schedule" of charging.
The managed flow of exhaust gas provided by the CCM ensures high-velocity flow of combustion gases. The appropriate separation of exhaust gas flow from different cylinders is maintained until the gas reaches the turbine wheel, spooling the two twin-scroll turbochargers without back-pressure. With maximum boost pressure of 1.5 bar (21 psi), the use of twin-scroll twin turbo technology and the CCM exhaust manifold allows complete exploitation of the benefits of turbocharging.
Immediate response and remarkable thrust characterize the new V8 twin-turbocharged engine from BMW M GmbH. The impressive onset of power is accompanied by unique, engaging engine sounds that accentuate the quick-revving characte¬ristics with the dynamic acoustic effect typical of a BMW M product. The sounds are always civilized, but transform from relatively calm to extraordinarily intense as the boost and revs build from idle. Reflecting the tremendous power of the engine, the turbocharged M V8 is equipped with an advanced cooling system developed specifically for the two new models. One notable feature in this context is the presence of two high-capacity water-to-air intercoolers which consistently optimize performance under the most demanding driving conditions. An aluminum oil sump exclusive to BMW M with a special finned surface guarantees optimum cooling at all times even under an extremely demanding style of driving.
The turbocharged M V8 engine develops its outstanding power with remarkable efficiency. In addition to BMW's High Precision Direct Injection, both the BMW X5 M and the BMW X6 M are equipped with a range of technologies from BMW's EfficientDynamics engineering strategy. These include on-demand control of the electric fuel pump, an on-demand compressor for the air conditioner, and a flow-controlled supply of hydraulic fluid to the Active Roll Stabilization system. By operating these features specifically on demand, energy waste is minimized. The engine fulfills the requirements of the US LEV II standard as well as the EU5 requirements in Europe.
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From: NW Arkansas -- Land O' Twisties
Scorke, if I see one of these in your profile info, I'm sending you a soccer decal that says "Kelsey #20." 
Just playing around!
Seriously though, you've got me wondering what MSRP on this thing will be.
Just playing around!
Seriously though, you've got me wondering what MSRP on this thing will be.
90k, they estimate, no certain number yet I could see them between 80 and 100, the x6 being the same.
If you see me with one that says Kelsey #20, we got a whole nother bunch of issues.
Scorke
What works on 1 application DOES NOT ALWAYS work on another.. I dont care what BMW puts on their cars.. Also youll notice they are revving these new M's to 6800 as where the Older M like my V10 M5 revs 8250rpm.. These may choke to death at 8250 just like much of the evos do in high rpm that are using small twin scroll turbos..
Mike
Mike
Last edited by AWD Motorsports; Apr 6, 2009 at 12:41 PM.
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Joined: Mar 2002
Posts: 4,312
Likes: 3
From: Birmingham, AL
Twin scroll tech is great, but wouldn't BMW's VANOS system have something to do with throttle repsonse too? Don't they use the individual throttle bodies on this app as well?
With that said, the fact they have an M version of this vehicle makes me ill.
With that said, the fact they have an M version of this vehicle makes me ill.
I loveee the sound of your M5, the exhausts are gorgeous too, that thing is sweet.
How is it for a DD in the state it is now?
Scorke
Scorke
The car doesnt make any TQ actually.. somewhere in the low 300's.. I have not yet dyno'd with TQ reading on Motor.. When i dyno'd 463 we didnt use RPM pickup.. On Nitrous its 584 and 484tq,.. Ran 10.90@127mph saturday.. Looking for 10.70's wed with some cooler weather..