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      10-08-2019, 08:16 PM   #23

Drives: F80 M3 Avus Blue
Join Date: Dec 2007
Location: San Diego

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Originally Posted by flightz71 View Post
That torque curve on the Supra though... am I reading this right? +50wtq on top of the Z4 @ 2.5krpm? Are the turbo PNs different?

Looks like a much smaller turbine on the Supra (+ some software castration) to yield that tq curve but lack of hp up top. With this chart - Supra should be way more fun to drive around town, it's also 200lbs lighter.
The turbos are definitely different part numbers, both versions of B58 turbos have the exhaust manifold integrated into the turbine housing.

All variants of BMW's B58 from the original 2016 340i to the newest G29 Z4 M40i (both US and EU spec) use a typical 6 to 2 manifold design that you would see on a twin scroll turbocharger.

The Toyota Supra's B58 has the 3 to 1 sections of its exhaust manifold built into the engine cylinder head where the manifold is actually cooled by the engine coolant. This engine only has 2 external exhaust ports that go directly into the twin scroll turbo housing.