Assume that you are speaking of the 7.3 DIT.
The 6.9 IDI was normally aspirated. Although many were upgraded with aftermarket Banks Turbo kits.
The 7.3 T is the 6.9 DI with a slight over bore to increase displacement and the factory added the turbo.
The 7.3 DIT was a clean sheet of paper new design. The only part carried over from the 7.3 T / 6.9 IDI were the roller lifters.
Along with the design being completely new, the machining and engine assembly and test were also all new and state of the art for 1993 when that engine launched.
The 7.3 DIT is truly a work horse.
