A Fiat 1.9jtd diesel engine has been extensively reviewed to output 300HP. This paper introduces a multiple stage turbocharging system that uses commercial turbocharger, taken from the catalogue of a popular manufacturer. The calculation method and the problem connected are widely discussed. Along with the problem that may arise in using these off the shelf unit. The quite heavy result advice the user to adopt ad-designed turbochargers for this task. © 2006-2015 Asian Research Publishing Network (ARPN).