10-09-2025, 09:47 AM
|
#1 (permalink)
|
|
High Altitude Hybrid
Join Date: Dec 2020
Location: Gunnison, CO
Posts: 2,334
Thanks: 1,324
Thanked 686 Times in 532 Posts
|
Coasting in neutral in a 54,000 to 85,000 lb vehicle.
So at work we got a new Kenworth T880 with an automated 18 speed manual transmission from Eaton. A weird thing it does is shift into neutral and coast when the grade is just slight enough to maintain vehicle speed coasting. The first time I drive the truck I got over 9 mpg which is impressive!
__________________
Last edited by Isaac Zachary; 10-18-2025 at 12:17 AM..
|
|
|
|
|
The Following 2 Users Say Thank You to Isaac Zachary For This Useful Post:
|
|
 Today
|
|
|
|
Other popular topics in this forum...
|
|
|
|
|
10-09-2025, 11:36 PM
|
#2 (permalink)
|
|
Human Environmentalist
Join Date: Aug 2010
Location: Oregon
Posts: 13,539
Thanks: 4,521
Thanked 4,732 Times in 3,645 Posts
|
New job?
|
|
|
|
|
10-10-2025, 12:58 AM
|
#3 (permalink)
|
|
High Altitude Hybrid
Join Date: Dec 2020
Location: Gunnison, CO
Posts: 2,334
Thanks: 1,324
Thanked 686 Times in 532 Posts
|
Quote:
Originally Posted by redpoint5
New job?
|
Yes, heavy equipment operator, but not since last year. I still have the other night janitorial job too.
__________________
|
|
|
|
|
The Following 2 Users Say Thank You to Isaac Zachary For This Useful Post:
|
|
|
10-17-2025, 11:50 AM
|
#4 (permalink)
|
|
High Altitude Hybrid
Join Date: Dec 2020
Location: Gunnison, CO
Posts: 2,334
Thanks: 1,324
Thanked 686 Times in 532 Posts
|
I guess no one is interested in discussing coasting in neutral.
__________________
|
|
|
|
|
10-17-2025, 03:06 PM
|
#5 (permalink)
|
|
Master EcoModder
Join Date: Aug 2012
Location: northwest of normal
Posts: 30,567
Thanks: 8,719
Thanked 9,424 Times in 7,773 Posts
|
Quote:
|
I guess no one is interested in discussing coasting in neutral.
|
...in a 54,000 to 85,000 lb vehicle.
"Automated manual' an oxymoron?
__________________
.
..Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
___________________
.
..The quickest way to double your money is to fold it iin half and put it in your back pocket -- Will Rogers
|
|
|
|
|
10-17-2025, 04:11 PM
|
#6 (permalink)
|
|
Somewhat crazed
Join Date: Sep 2013
Location: 1826 miles WSW of Normal
Posts: 4,903
Thanks: 717
Thanked 1,344 Times in 1,183 Posts
|
Last I knew, in a commercial licensed application such coasting was either frowned upon or actually illegal. School bus it is definitely illegal
__________________
casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
|
|
|
|
|
10-17-2025, 07:37 PM
|
#7 (permalink)
|
|
High Altitude Hybrid
Join Date: Dec 2020
Location: Gunnison, CO
Posts: 2,334
Thanks: 1,324
Thanked 686 Times in 532 Posts
|
Quote:
Originally Posted by freebeard
...in a 54,000 to 85,000 lb vehicle.
|
Yes. And if that's beneficial and legal in such a vehicle, why not in pretty much everything else?
Quote:
Originally Posted by freebeard
"Automated manual' an oxymoron?
|
Yes, that would be an oxymoron. But regardless, it's an automatic transmission that doesn't have a torque converter nor does it have planetary gear sets and clutching mechanisms that a typical automatic transmission would have. This one has a single clutch, and the gears don't even have synchronizers. It has to double clutch every shift, up or down, in order to get into gear.
Quote:
Originally Posted by Piotrsko
Last I knew, in a commercial licensed application such coasting was either frowned upon or actually illegal. School bus it is definitely illegal
|
Why would it be different between school buses and other commercial vehicles? I've never read or heard of any difference, and I have a class B license as well as my school bus and passenger endorsements.
What I wonder is if the definition of coasting either doesn't apply to automatic transmissions, or if it's different than what we normally interpret it as. Like, if you're going down a slight incline, and you take 15 or 20 seconds to shift, double clutching, but your speed never varied more than 2 mph, did you shift into neutral and coast for 15 or 20 seconds or did you just take longer to shift than normal?
__________________
|
|
|
|
|
The Following User Says Thank You to Isaac Zachary For This Useful Post:
|
|
|
10-17-2025, 11:21 PM
|
#8 (permalink)
|
|
Master EcoModder
Join Date: Aug 2012
Location: northwest of normal
Posts: 30,567
Thanks: 8,719
Thanked 9,424 Times in 7,773 Posts
|
Quote:
|
Yes. And if that's beneficial and legal in such a vehicle, why not in pretty much everything else?
|
Everyone else with an automated 16-speed manual?
__________________
.
..Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
___________________
.
..The quickest way to double your money is to fold it iin half and put it in your back pocket -- Will Rogers
|
|
|
|
|
10-18-2025, 12:17 AM
|
#9 (permalink)
|
|
High Altitude Hybrid
Join Date: Dec 2020
Location: Gunnison, CO
Posts: 2,334
Thanks: 1,324
Thanked 686 Times in 532 Posts
|
Quote:
Originally Posted by freebeard
Everyone else with an automated 16-speed manual?
|
Sorry, that was a typo. It's an 18 speed. Most of the other trucks have 18 speed manual transmissions.
But if you have 18 speeds to choose from, and at vehicle speeds from as low as 28 mph clear up to any highway speed the vehicle still decides neutral is the best "gear" to stay in, then wouldn't that be even more applicable to a 3, 4, 5 or 6 speed transmision?
__________________
|
|
|
|
|
10-18-2025, 12:55 AM
|
#10 (permalink)
|
|
Master EcoModder
Join Date: Aug 2012
Location: northwest of normal
Posts: 30,567
Thanks: 8,719
Thanked 9,424 Times in 7,773 Posts
|
Quote:
|
...then wouldn't that be even more applicable...
|
Well, yes.
Is there an example of a 4-5 speed automatic manual? In the used car market?
__________________
.
..Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
___________________
.
..The quickest way to double your money is to fold it iin half and put it in your back pocket -- Will Rogers
|
|
|
|
|
