Re: Economy mode Reply #25 – June 04, 2019, 07:17:47 pm Quote from: wolfe10 – June 04, 2019, 10:54:36 amIf you want an excellent insight into RPM for best MPG, LISTEN TO THE 18 WHEELERS. All (certainly all the privately owned ones who pay for their own fuel) climb those grades (yes, with more than twice our weights) JUST ABOVE PEAK TORQUE RPM. THAT IS THE BEST MPG.Now, if coolant temperature is rising, MPG takes a distant back seat to temperature. Higher RPM, slightly less than WOT is much better for cooling. It is also better for those who are frustrated by looking a few MPH on those grades.As a former trucker. You are correct. Torque gets work done, HP maintains the work. The hard thing for all the indy 500 drivers in buses is that to climb a hill at max efficiency, You need to be at max torque. Which means slowing/shifting down so torque multiplication (lower gear) lets the bus maintain speed at less than full throttle. When I owned my Kenworth W900 with a 15 liter Cat engine rated at 500HP-1950LbFt torque, 13 speed tranny. Pulling two FedEx trailers 60,000lbs across Northern Wyoming at 75MPH. I would get 5-5.5 MPG by shifting to stay at max torque. Quote Selected
Re: Economy mode Reply #26 – June 04, 2019, 07:33:59 pm Quote from: Bob & Sue – June 04, 2019, 02:34:47 pmYour good then, mode on for the rolling hills. We just retuned from the Texas hill country and I went through the 5th to 6th thing. Wish this thread would have started before, I think I already new about the mode thing but spaced it. Yep,sure missed that memo..............learn something new about these machines just about every time I log on to this forum, a truly great resource. Quote Selected 1 Likes
Re: Economy mode Reply #27 – June 05, 2019, 01:56:46 am Quote from: bigdog – June 04, 2019, 07:17:47 pmAs a former trucker. You are correct. Torque gets work done, HP maintains the work. The hard thing for all the indy 500 drivers in buses is that to climb a hill at max efficiency, You need to be at max torque. Which means slowing/shifting down so torque multiplication (lower gear) lets the bus maintain speed at less than full throttle. When I owned my Kenworth W900 with a 15 liter Cat engine rated at 500HP-1950LbFt torque, 13 speed tranny. Pulling two FedEx trailers 60,000lbs across Northern Wyoming at 75MPH. I would get 5-5.5 MPG by shifting to stay at max torque. Torque is what gets us up the hill. Horse Power is what determines how fast we get up the hill. Quote Selected 1 Likes
Topic: Economy mode