Quote:
Originally Posted by solstice
Nothing is a bit strong.
The compressor wheels used in the turbochargers are said to have been upgraded over the S55’s, while the entire charge-air system has been optimized for flow to mitigate pressure losses. An electronically controlled wastegate is also present, along with what BMW refers to as a water-to-air intercooler.
Like the most recent versions of the N63 and S63 V8 engines, the S58’s direct-injection system now boasts fuel pressure that has been increased from 2,900 psi to over 5,000. This mirrors a change made to the corporate V8 last year, which allowed it to reach its highest rated output yet. Benefits include further improved fuel atomization within the combustion chambers, which is best experienced under heavy engine loads with full acceleration from high speeds.
The core of the cylinder head is one of the most interesting components of the S58. Manufactured using an additive process that can best be thought of as incredibly advanced 3D printing, the cylinder-head core takes a shape that would be impossible to create using any other currently available mass-production method. If the skeletal structure seems at all familiar, that’s because the same process is used to manufacture the ultra-lightweight brake calipers of the M850i Night Sky.
One of the main advantages of the core—and the new manufacturing process—is the ability to accommodate the routing of coolant ducts where they previously could not reach, in an effort to better regulate internal temperatures.
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True, "nothing" was a bit harsh. But it still offers very limited advances. The S55 also has electronic controlled wastegates as well as a water-to-air intercooling system. The revised compressor wheel (read bigger) is exactly what I said as being the main change. The only difference of significance is the higher injection pressures which should help with off boost throttle response.