Fuel Only 1000 HorsePower LMM

Published in the July 2010 Issue July 2010

1,000 is the new 900. At least that's how it's going in the world of common-rail Duramax performance builds.

Custom Auto has built a 2008 Duramax LMM that is hitting the dyno at 1,015 rear-wheel horsepower on fuel only. The wild V8 is achieving those numbers through a Custom Auto-built compound turbo setup using a GT47 and GT4094 charger combination and the shop's own EFI Live tuning.

The engine is built for torque, first getting a main girdle by Randy's Engine and Machine. Carrillo connecting rods holding Mahle forged pistons handle the ignition compression forces, and SoCal Diesel's CNC-Ported heads control the valves and air flow.

The engine also has PPE dual CP3s exhaust manifolds and up pipes, Dynomite Diesel injector nozzles and an AirDog lift pump.

Custom Auto loaded Edge Racing Products' new CTS Insight with its EFI Live tunes, and the shop built the transmission for the high-horsepower truck as well.

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