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Mercedes SL-Class with a Compound-Turbo OM648

Published in engineswapdepot.com

Black Smoke Racing debuted a new project at the 2026 American Car Show in Finland. The company started with a Mercedes SL-Class (R230) and dramatically change the appearance with an AMG GT-R body kit. In the engine bay they swapped a compound-turbocharged 3.2 L OM648 inline-six. Garrett reports the compound-turbo system uses a G40-900 turbocharger and G47-1850 turbocharger. Black Smoke Racing cooled the charged air with a custom water-to-air intercooler with two cores and a custom air-to-air intercooler with three cores. They estimate this is enough cooling capacity for 7 bar (101 psi) of boost or 2500 hp (1838 kW). Behind the monster motor is a G-force dogbox and Winters quick-change rear end. Black Smoke Racing will be releasing more details on the project soon.

front view of a custom Mercedes SL R230

compound-turbo OM648 inline-six in the engine bay of a custom Mercedes SL R230

compound-turbo OM648 inline-six in the engine bay of a custom Mercedes SL R230

compound-turbocharger system on a OM648 inline-six

front of an OM648 inline-six

rear view of a custom Mercedes SL R230

rear wing and taillight on a custom Mercedes SL R230

wheel and tire on a custom Mercedes SL R230

Source: Black Smoke Racing FB page and Garrett FB page

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