If you have a CAT, what's your favorite RPM when cruising with a heavy load?
#11
06-22-2009, 02:20 PM
Join Date: Mar 2007
Location: Cambridge, Ontario, Canada
Posts: 1,316
LINE HAUL (1,750 lb-ft torque and higher) SPEC for 1,325 RPM @ 65 MPH for aerodynamic vehicles (incl. flatbed up to 10.5' high) and 1,375 RPM @ 65 MPH for non-aero-dynamic vehicles (incl. flatbed over 10.5') HEAVY HAUL (torque: 1,850 lb-ft and higher) 80,000 - 85,000 lb GCW SPEC for 1,350 RPM at 65 MPH 85,000 - 90,000 lb GCW SPEC for 1,425 RPM at 65 MPH 100,000 lb GCW SPEC for 1,500 RPM at 65 MPH 110,000 - 140,000 lb GCW SPEC for 1,500 RPM @ 62 MPH 140,000 - 200,000 lb GCW SPEC for 1,575 RPM @ 62 MPH
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#12
06-24-2009, 01:19 AM
3.36 rears, 22.5 (not low pros), 18 speed eaton with 550hp cat.
Quite honestly I do 5 over, so if I am in a 70mph state I do 75, which puts me just slightly over 1500, maybe like 15,200, and I don't really see that much of a fuel difference from doing 70 at about 14600 rpm, at 65 it is like 13.75 for rpm, and I do see a much better fuel economy, over 70 to 75. At 80 it sucks fuel (about 15800 rpm) Holy ****, your motor's a zinging'!
#13
06-24-2009, 11:49 PM
Yeah I was tired when I typed that
 Wasn't paying much attention 
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