Quote:
Originally Posted by 99metro
Keep EGTs low and combustion temps high. Some guys install custom higher temp (203*) thermostats to at least keep the coolant temps high. I used to drive by EGT when I had the old '96 F250 PSD and a set of gages. I tried to keep it below 600* at all times while unloaded. My Dodge 24v 5.9 is currently gageless (!!!).
Keeping the RPMs on the high side while towing and towing uphill will keep the EGTs down, vice keeping it in the peak torque and most fuel efficient area (around 1750 rpm).
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Keeping intake manifold pressure low, and exhaust gas temperatures low is what works on an empty, solo, Dodge. Rpms between 1,700-1,900. Roughly, if one can maintain 5-psi and 600F then fuel economy is high. (Or, an average speed [elapsed time derived] of 27 mph or higher).
Loaded and towing is different. Cummins tells us that 2,150 rpm is the balance between economy & power. A diesel in a truck is meant to work, so low rpms are not the way to go when loaded/towing AND off the flatlands. Road, load and speed have to be understood to find the best balance.
I would say EGT is an aid to understanding how to efficiently drive a diesel.