Go Back   EcoModder Forum > EcoModding > Hypermiling / EcoDriver's Ed
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 06-07-2014, 03:09 AM   #1 (permalink)
Furry Furfag
 
Baltothewolf's Avatar
 
Join Date: Nov 2013
Location: Apple Valley
Posts: 2,084

Winsight - '00 Honda Insight
90 day: 56.69 mpg (US)

Miaderp - '95 Mazda Miata
90 day: 28.53 mpg (US)
Thanks: 67
Thanked 409 Times in 313 Posts
Do manuals coast farther then automatics?

I have been thinking about this the past few days, and I figure I would just ask. Do manuals coast farther than automatics? Both in neutral. Lets say you drive the automatic and manual on the same exact piece of land, at the same speed put both cars in neutral, which one will coast farther?

__________________

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 06-07-2014, 09:36 AM   #2 (permalink)
...beats walking...
 
Join Date: Jul 2009
Location: .
Posts: 6,190
Thanks: 179
Thanked 1,525 Times in 1,126 Posts
Which, IN or OUT of gear(s)?

Manuals have LESS overall power loss (~12-15%) AND can be placed in NEUTRAL, but some gears are always engaged.

Automatics have MORE overall power loss (~15-20%) BUT are never completely disengaged due to combination of pump and torque converter operations.
  Reply With Quote
Old 06-07-2014, 10:29 AM   #3 (permalink)
Hydrogen > EV
 
Join Date: Apr 2012
Location: NW Ohio, United States
Posts: 2,022

Silver Flea - '05 Honda Insight
90 day: 58.96 mpg (US)
Thanks: 992
Thanked 396 Times in 283 Posts
In theory, the automatic will. Automatics weigh more, and all things being equal, adding weight adds momentum. Imagining like you said, both in neutral at the same speed in the same spot with same conditions, adding weight will increase the coast distance. Granted it's not too much weight, standards have weighed less in every vehicle I have compared the two transmissions.
__________________





Best Tanks:
Mustang - 54.83 mpg (US) at the Green Grand Prix
Insight - 82.91966 mpg (US) over 818.5 miles.
  Reply With Quote
Old 06-07-2014, 11:05 AM   #4 (permalink)
Drive less save more
 
ecomodded's Avatar
 
Join Date: Jul 2011
Location: Vancouver Island, Canada
Posts: 1,189

Dusty - '98 VOLKSWAGEN Beetle TDI
TEAM VW AUDI Group
90 day: 60.42 mpg (US)
Thanks: 134
Thanked 162 Times in 135 Posts
Being about 100lbs heavier then standards hauling that heavy automatic transmission costs you fuel just in its shear weight let alone its friction losses.

Most of the wasted fuel caused by the automatic trans is due to the lack of early/lower rpm high gear engagement, I suspect you could due very well with a gear selectable automatic trans.
__________________
Save gas
Ride a Mtn bike for errands exercise entertainment and outright fun
__________________




Last edited by ecomodded; 06-07-2014 at 11:17 AM.. Reason: add
  Reply With Quote
Old 06-07-2014, 11:16 AM   #5 (permalink)
Hydrogen > EV
 
Join Date: Apr 2012
Location: NW Ohio, United States
Posts: 2,022

Silver Flea - '05 Honda Insight
90 day: 58.96 mpg (US)
Thanks: 992
Thanked 396 Times in 283 Posts
Quote:
Originally Posted by Baltothewolf View Post
I have been thinking about this the past few days, and I figure I would just ask. Do manuals coast farther than automatics? Both in neutral. Lets say you drive the automatic and manual on the same exact piece of land, at the same speed put both cars in neutral, which one will coast farther?
An automatic will win in this regard- it should coast further, all other things being equal.
__________________





Best Tanks:
Mustang - 54.83 mpg (US) at the Green Grand Prix
Insight - 82.91966 mpg (US) over 818.5 miles.
  Reply With Quote
Old 06-07-2014, 11:19 AM   #6 (permalink)
Drive less save more
 
ecomodded's Avatar
 
Join Date: Jul 2011
Location: Vancouver Island, Canada
Posts: 1,189

Dusty - '98 VOLKSWAGEN Beetle TDI
TEAM VW AUDI Group
90 day: 60.42 mpg (US)
Thanks: 134
Thanked 162 Times in 135 Posts
2 feet further ? 10 feet further ? might friction losses cancel it out ?
__________________
Save gas
Ride a Mtn bike for errands exercise entertainment and outright fun
__________________



  Reply With Quote
Old 06-07-2014, 11:26 AM   #7 (permalink)
Hydrogen > EV
 
Join Date: Apr 2012
Location: NW Ohio, United States
Posts: 2,022

Silver Flea - '05 Honda Insight
90 day: 58.96 mpg (US)
Thanks: 992
Thanked 396 Times in 283 Posts
What friction occurs when it's not in gear? I didn't think there was any.
__________________





Best Tanks:
Mustang - 54.83 mpg (US) at the Green Grand Prix
Insight - 82.91966 mpg (US) over 818.5 miles.
  Reply With Quote
Old 06-07-2014, 11:27 AM   #8 (permalink)
Drive less save more
 
ecomodded's Avatar
 
Join Date: Jul 2011
Location: Vancouver Island, Canada
Posts: 1,189

Dusty - '98 VOLKSWAGEN Beetle TDI
TEAM VW AUDI Group
90 day: 60.42 mpg (US)
Thanks: 134
Thanked 162 Times in 135 Posts
input shaft is still spinning

But perhaps that's not a real good argument as the standards transmission is as well , only with lighter fluid viscosity
__________________
Save gas
Ride a Mtn bike for errands exercise entertainment and outright fun
__________________



  Reply With Quote
Old 06-07-2014, 11:51 AM   #9 (permalink)
Hydrogen > EV
 
Join Date: Apr 2012
Location: NW Ohio, United States
Posts: 2,022

Silver Flea - '05 Honda Insight
90 day: 58.96 mpg (US)
Thanks: 992
Thanked 396 Times in 283 Posts
I am not aware of the differences between the standard and auto, I was only aware of the weight difference. I couldn't speak to the input shaft, but I imagine if both have then it would be working the same.
__________________





Best Tanks:
Mustang - 54.83 mpg (US) at the Green Grand Prix
Insight - 82.91966 mpg (US) over 818.5 miles.
  Reply With Quote
Old 06-07-2014, 01:25 PM   #10 (permalink)
Cyborg ECU
 
California98Civic's Avatar
 
Join Date: Mar 2011
Location: Coastal Southern California
Posts: 6,299

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 66.42 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
Thanks: 2,373
Thanked 2,172 Times in 1,469 Posts
Where does the auto trans fluid pump get its power? Is it a parasitic load on the trans directly, indirectly via the engine, or more indirectly via some electrical system drawing on the battery?

__________________
See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.



  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com