Abstract: The present invention relates mainly to an optimized turbocompressor for engines mounted transversely, notably for in-line four-cylinder engines mounted transversely. The main subject of the invention is a turbocompressor (1?) comprising a turbine (3?) and coupling means (5?) and a compressor (7?), characterized in that, when looking in the direction (X-X?) from the compressor (7?) toward the turbine (3?) the rotating parts of the compressor rotate in the positive trigonometric direction. Another subject of the invention is a turbocompressor (1?) comprising a turbine (3?), a compressor (7?), means of coupling the turbine (3?) and the compressor (7?), characterized in that the rotating parts of the turbine when looking in the direction (X-X?) from the compressor (7?) toward the turbine (3?) rotate in the positive trigonometric direction. The invention notably applies to the automotive industry. The invention applies mainly to the internal combustion engine intake turbocompressor industry.