Compression Ignition Addict
Join Date: Feb 2011
Location: upstate ny
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If your EGT probe is POST turbo, 1200 degrees is about right. However if the EGT probe is in the manifold, pre-turbo, I stick to 1350. Nothing sustained higher than that. As for the delta, 15 degrees indicates a clogged cooler (cruising) but sometimes under load or on a grade you can get higher than that with healthy coolers. As far as what is too hot, the fan comes on around 218 IIRC, and when it does it'll cool down a healthy engine very quickly. Just driving ECT and EOT should be in the upper 180s, low 190s.
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2005 Lariat CCSB F-350 SRW
300,000 miles and going strong
12" fabtech lift with 40" Xterrain's on M/T classic locks, Adjustable track bar, Bilstein 7100 reservoir shocks
Edge juice/attitude CTS, SCT with ID tunes, Snow meth. injection, Diamond eye 4" exhaust, 03 turbo, ARP studs, Sinister coolant filter
2010 stone seats/console, pioneer avic d3 with backup camera/bluetooth
Viair 450c compressor, dual 2.5 gallon tanks, air horns rated @115db