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I have both (well actually 3) ECM'sGreat to know about the tuning. Have you had any done or is yours stock?
Your weights are quite different from numbers I've got from our 10k shipping scale and digital crane/forklift scale.
one with +40hp fuel & 3500 rpm (using this one)
one with +100hp and 4k rpm... (but I do not have compounds / airflow req'd for this) but had it programmed "for someday"
not sure what weights are quite different - I was agreeing / stating our shop sale showed about that same within 200lbs .... there's a ton of info on drivetrain weights
"it is what it is"
the biggest difference is the front engine area "package length" and resultant CG
my build could not accommodate a 6cyl cummins ... And the 4bt was not as smooth and a bit vanilla for my taste ( I had done two 4bt conversions prior) so when my son and I wanted to build something the common rail 4cyl is what we chose.
The C2.8 was not really as main stream for our area and did not have the in-use hours/miles IMO but that's a strong choice too... my setup really fits what I wanted:
- minimal "needed" wires to operate engine reliably
- Longevity of the engine / history
- somewhat compact (she is a very tall engine - even with oil pan swap options)... but its maybe 8-10inches shorter than the 12v or 5.9/6.7CR
- SAE2 clutch is beefy & eaton is pretty stout
of the top of my head - those were the major thoughts on how I got to a common rail 3.9L cummins
6cyl too big
C2.8 unproven at the time and smaller/less power