ISX450.......unrealistic expectations?

[Magard]

A 450/1650 is not the problem. That’s plenty of power for a flatland farmer truck. Get some gauges on it. Helps diagnose problems. Egr tune up and charge cooler leaks is probably the place to start. Even if you don’t pull the intake manifold at least get all the sensors done and see if it helps. No one will want to do any remote tune work until you get it right anyway. It’s to frustrating to figure out a basket case remotely. Also if sensors don’t help I would be looking at a egr valve being possibly partially stuck open. Those are just a few simple places to start.