From somewhere outside StL
- Nov 7, 2010
Where is your pyrometer? That makes a big difference on EGTs at the gauge. "Most" put the probe just downstream from the turbo. If yours is just past the turbo then your cruising EGTs are pretty normal. 1300 is getting too high. Ideally, you don't want to see more than 1200 or so. 1300 for brief stints is probably ok, but I wouldn't do it for miles up a grade. Getting close to 1400... lift! Keep an eye on the gauge. They can go up really fast, but they'll come down fast too when you stop pouring fuel.I'm suspicious of the boost gauge. It tops out at 17psi on the tune. EGTs climb to around 1300 at WOT to 70mph. Cruising at highway speed is around 500-600.
Running at the +80 setting, I would expect your EGTs to stay in the 1000-1100 range. I'd get the exhaust on and see where you are. If you put the pyrometer ahead of the turbo (really hard to do on the 7.3 unless you drill and tap a manifold), I would move it into the bend just beyond the turbo.
I think your boost gauge is off. A stock 7.3 should be in the mid-upper teens. 16-17 psi, if I remember right. Mine, chipped on the highest setting, would blow about 26-28psi depending on air temp and load.