3.25 vs 3.55
Discussion in 'Kenworth Forum' started by FALCON 74, Jun 17, 2018.
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22.5 LP -
You’d be running about 75 in the big hole at 1400, assuming a .74 OD transmission.
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I would ideally cruise around 1150-1200RPM since the Cummins peak torque curve is 1150RPM. and I am considering getting the 505HP 2050 TQ version instead of 525HP. I would be pulling reefer and staying consistently loaded for the most part. So I want enough power to get me up steep grades with 75,000 LBS but also want somewhat decent fuel economy
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The other thing would be similar weights but stepdeck
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http://www.roadranger.com/ecm/groups/public/@pub/@eaton/@roadranger/documents/content/ct_062746.swf
3.25 = 71.1 mph @ 1400 rpm
3.55 = 65.1 mph @ 1400 rpm
If you aren't pulling over 80,000 lbs and aren't pulling a lot of big hills, your 3.25's will be fine. -
I had this almost exact setup with that motor. You will like it i think.
Only difference was my tires were 22.5LP....
If you go with 11R you might want a 3.25 or 3.36 rear ...
These motors aren't the same as the older ones that needed lots more RPM...
honestly doing it again, I'd go 500/1850 Efficiency , that 2050tq isn't a crazy power difference for the extra fuel consumption...
Plus that E series pulls further down to 1,000rpm which might actually be more useful real world business sense too, saving more fuel.Driver Eight Thanks this. -
I have a 2017 Kenworth t680 with the Paccar MX 13 and 3.15 radiu and 22.5 Hankook tires, does anyone know the sweet spot for this truck?
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Last edited: Sep 11, 2020
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