This is another custom project we did for a local customer. We modified an Eaton MP90 supercharger designed to fit a Toyota Tundra and machined it to fit a Lexus LS430 3UZ-FE V8 engine. The supercharger snout was too long for proper alignment of the belt drive system. The original TRD pulley was 2.3 inch diameter and too small for the boost pressure desired by customer. Customer wanted a boost threshold of 6psi. Using factory LS430 crankshaft pulley dimensions it was calculated that a 2.9 inch supercharger pulley will provide 5.9psi boost pressure. We chose to install a quick change supercharger pulley. This eliminated the need for custom pulley puller and allows for fast changes in boost pressure with a simple pulley replacement.
Supercharger was disassembled and all components inspected for wear and evaluated for replacement. Supercharger snout was welded to fill in an indent in the casting. This casting indent/dimple is not present on most Eaton M90 or MP90 superchargers. Great care was taken to ensure proper welding penetration as well as heat dissipation to ensure minimal component warping. Coaxial alignment of the bearing seating area is critical for supercharger performance. All component machining operations were performed using a lathe. Special fixture was made to ensure snout alignment during machining. Input shaft was shortened in the lathe ensuring all critical bearing and pulley seating areas remained accurate size and coaxial.
- Shorten supercharger snout
- Determine proper pulley size requirement for 6psi boost pressure threshold
- Supercharger disassembly, component cleaning, and inspection. Bearings, seals, input shaft, and drive coupler inspected for wear and component replacement determined
- Supercharger snout and input shaft precisely measured and blueprints compiled
- Supercharger snout welded to remove casting indent
- Machining fixture made to mount snout
- Supercharger shout shortened as per instruction
- Supercharger input shaft shorted
- Dimensions verified after machining
- Snout reassembled
- New, low drag, supercharger seal installed
- Quick change pulley hub pressed onto the input shaft
- Supercharger reassembled and filled with fluid