Originally Posted by swhite832
I used to have a 93 dodge and those guys at dieseltrucktruckresource.com are the go to guys for bombing an engine. 1st - you will want gauges, specifically an exhaust temp gauge at the turbo. If you want to go faster without regearing you will use more fuel. More fuel means higher temps. Higher temps are a turbo killer.
Leave the engine at spec or close to it and regear. My personal goal is to cruise at about 65 at a lower RPM, which means re gear.
in most cases, identical engines are put into buses with different hp specs, and many buses are governed to not travel over 55 mph. Turning up the rpm's to below redline, and letting the engine make the same hp that other identical engines make when they roll off the assembly line are both pretty safe things to do.