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I was asked about the EGTs running a 475HP tune on another thread but did not want to hijack that thread so here is my answer.
I could easily push them into the 1400s with the 475HP tune,
With the 365HP tune and busting a 30-35mph head wind (20-30 is VERY common down here on the Coastal Plains) I am running around 1200-1250@75-80MPH which is starting to get uncomfortable so I normally back off until I get under 1200, the Duramax normally runs a higher EGT than say the 6.5L.
1350-1400 is considered MAX for any length of time and up to 1800 in the 1/4 mile, any of those numbers would likely immediately melt the 6.5L but are OK for the Duramax.
Normal cruising without a strong head wind I run around 1000-1050@75-80MPH (my normal cruising speed) the wind makes a big difference, down wind I often see 900 or so.
Just 3-4MPH can make a big difference.
I could easily push them into the 1400s with the 475HP tune,
With the 365HP tune and busting a 30-35mph head wind (20-30 is VERY common down here on the Coastal Plains) I am running around 1200-1250@75-80MPH which is starting to get uncomfortable so I normally back off until I get under 1200, the Duramax normally runs a higher EGT than say the 6.5L.
1350-1400 is considered MAX for any length of time and up to 1800 in the 1/4 mile, any of those numbers would likely immediately melt the 6.5L but are OK for the Duramax.
Normal cruising without a strong head wind I run around 1000-1050@75-80MPH (my normal cruising speed) the wind makes a big difference, down wind I often see 900 or so.
Just 3-4MPH can make a big difference.