Quote:
Originally Posted by burnin oil
You will want a little more RPM to keep that 3.9 happy. Basically it will be lugging around without any boost while trying to move that brick. My 95 Dodge spun 2600 RPM on the interstate and the rest of my commute was like going to a rock concert. She still knocked out mid 18s for milage in a 4x4. My dads 24v 5.9 gets just under 20mpg every tank, unless towing, running 4.10s and a 6spd in a 4x4. Don't let the RPM scare you to much. Just make sure the pumps gov springs are addressed so it doesn't go into defuel.
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I didn't know that the 3.9L wanted more rpm. I figured it was pretty close to the 5.9L. I'm familiar with the basic process of waking up these motors, but I don't have wrench time on them though.
Also, is there any reason to avoid the Isuzu diesel? Would it cost me more in the long run? I think I can pickup the Isuzu for 1000 but I can't seem to find a Cummins for less than 2000.
And lastly, should I consider just swapping over to a 5.9L instead of the 3.9L?