Yes, that is part of the equation. Different pistons, injection pump
calibration, probably different cam timing and perhaps compression ratio.

All these differences between normally aspirated and turbo become more and
more critical as a diesel gets closer and closer to peak power.

At idle, a the turbo does almost nothing. The question here is how much
removing the intercooler would affect partial throttle operation.
"JAXAshby" wrote in message
...
_usually_ a turbo engine has different pistons in it than the same engine
normally aspired.

Is the Perkins different?

removal of the turbo's would put
you in the 105 HP range