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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 06-25-2009, 03:29 AM   #61 (permalink)
Grasshopper
 
alohaspirit's Avatar
 
Join Date: Feb 2009
Location: Hawaii
Posts: 964

Makai - '01 Toyota Echo 4D Auto
90 day: 34.45 mpg (US)

New Galaxy - '07 Toyota Prius
90 day: 42.15 mpg (US)
Thanks: 25
Thanked 30 Times in 25 Posts
thanks for clearing that up


the last question is about shifting back into drive while coasting in neutral

lets say doing 20 mph - 40 mph

__________________
Past Present Future?
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 06-25-2009, 09:12 AM   #62 (permalink)
Hypermiler
 
PaleMelanesian's Avatar
 
Join Date: Dec 2007
Location: Texas
Posts: 2,310

PaleCivic (retired) - '96 Honda Civic DX Sedan
90 day: 69.2 mpg (US)

PaleFit - '09 Honda Fit Sport
Team Honda
Wagons
90 day: 44.06 mpg (US)
Thanks: 598
Thanked 420 Times in 275 Posts
At 20-40 mph, I just shift to D, let it settle a moment, and go. RPM is low so there's little stress to the system.
Above that, I give a little gas to put the rpm where it will be after the shift, then shift, settle, and go. There's very little bump when you do this.
__________________



11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
  Reply With Quote
Old 06-25-2009, 01:07 PM   #63 (permalink)
Moderate your Moderation.
 
Join Date: Nov 2008
Location: Troy, Pa.
Posts: 8,919

Pasta - '96 Volkswagen Passat TDi
90 day: 45.22 mpg (US)
Thanks: 1,369
Thanked 430 Times in 353 Posts
I just put it in gear, even at 55-60mph.

Fluid shear in the torque converter prevents the "shift shock" that you would expect. It's like turning a fluid-clutch-type cooling fan... The more power you apply to it, the more times it will turn over before the hub catches up. This results in more heat applied to the fluid, since shear causes heat to build up quickly, but it's less heat generated than just starting from a stop.
__________________
"ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"

  Reply With Quote
Old 06-25-2009, 10:52 PM   #64 (permalink)
HyperHopeful
 
jonEmetro's Avatar
 
Join Date: May 2009
Location: Ramona, CA
Posts: 12

geosynchronous - '96 Geo Metro lsi
90 day: 41.82 mpg (US)
Thanks: 0
Thanked 1 Time in 1 Post
Back to manual trans. real quick. I swapped in the tall 3.5-1 trans. in my metro and have little engine braking in 5th gear and speeds of under say 45mph. So this question is model/drivetrain specific.
  Reply With Quote
Old 06-25-2009, 10:57 PM   #65 (permalink)
Moderate your Moderation.
 
Join Date: Nov 2008
Location: Troy, Pa.
Posts: 8,919

Pasta - '96 Volkswagen Passat TDi
90 day: 45.22 mpg (US)
Thanks: 1,369
Thanked 430 Times in 353 Posts
Quote:
Originally Posted by jonEmetro View Post
Back to manual trans. real quick. I swapped in the tall 3.5-1 trans. in my metro and have little engine braking in 5th gear and speeds of under say 45mph. So this question is model/drivetrain specific.
If you have little engine braking, chances are that you're not in DFCO. DFCO never occurs within something like 500 RPM of the preset idle speed, as there is too much chance for false input and the engine stalling as a result.

You're still better off to coast in neutral than with the clutch down, except that in neutral, you may be breaking some law somewhere...

I've never personally had a throwout bearing explode on me, but I've seen what happens when they do... I bought a car for $200 because one exploded, and the clutch disk also exploded, leaving only a thin sheet of metal between the flywheel and pressure plate, and ceramic dust all over the place inside the bell housing.
__________________
"ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"

  Reply With Quote
Old 06-25-2009, 11:05 PM   #66 (permalink)
HyperHopeful
 
jonEmetro's Avatar
 
Join Date: May 2009
Location: Ramona, CA
Posts: 12

geosynchronous - '96 Geo Metro lsi
90 day: 41.82 mpg (US)
Thanks: 0
Thanked 1 Time in 1 Post
Yes, blown throw-out bearing is very loud! I am 100% sure I'm in DFCO cause when I get down to about 1000 rpm I feel a change in decel rate and my SG2 instant MPG changes from 9999 to around 100mpg. I'm tellin ya, tall gears are the way to go.
  Reply With Quote
Old 06-25-2009, 11:08 PM   #67 (permalink)
Moderate your Moderation.
 
Join Date: Nov 2008
Location: Troy, Pa.
Posts: 8,919

Pasta - '96 Volkswagen Passat TDi
90 day: 45.22 mpg (US)
Thanks: 1,369
Thanked 430 Times in 353 Posts
I made an incorrect assumption that you were closer to idle. Apparently, the 500 RPM thing isn't true either. That's not something I've tested, but something I've been told by "reputable" people.

Taller gears are definitely the way to go, but DFCO still doesn't usually hold a candle to Neutral Coasting, and it definitely doesn't hold anything against EOC.
__________________
"ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"

  Reply With Quote
Old 06-25-2009, 11:15 PM   #68 (permalink)
HyperHopeful
 
jonEmetro's Avatar
 
Join Date: May 2009
Location: Ramona, CA
Posts: 12

geosynchronous - '96 Geo Metro lsi
90 day: 41.82 mpg (US)
Thanks: 0
Thanked 1 Time in 1 Post
No doubt, Ive been workin on my EOC skills and slowly improving. But I believe thats a story for a different thread.
  Reply With Quote
Old 06-26-2009, 12:13 AM   #69 (permalink)
Grasshopper
 
alohaspirit's Avatar
 
Join Date: Feb 2009
Location: Hawaii
Posts: 964

Makai - '01 Toyota Echo 4D Auto
90 day: 34.45 mpg (US)

New Galaxy - '07 Toyota Prius
90 day: 42.15 mpg (US)
Thanks: 25
Thanked 30 Times in 25 Posts
Quote:
Originally Posted by Christ View Post
Taller gears are definitely the way to go, but DFCO still doesn't usually hold a candle to Neutral Coasting, and it definitely doesn't hold anything against EOC.


DFCO < Neutral Coasting < EOC


this is good to know
__________________
Past Present Future?
  Reply With Quote
Old 06-26-2009, 09:01 AM   #70 (permalink)
Hypermiler
 
PaleMelanesian's Avatar
 
Join Date: Dec 2007
Location: Texas
Posts: 2,310

PaleCivic (retired) - '96 Honda Civic DX Sedan
90 day: 69.2 mpg (US)

PaleFit - '09 Honda Fit Sport
Team Honda
Wagons
90 day: 44.06 mpg (US)
Thanks: 598
Thanked 420 Times in 275 Posts
Quote:
Originally Posted by alohaspirit View Post
DFCO < Neutral Coasting < EOC
I concur, with two exceptions:
1. You are forced to brake for an unexpected stop. You might as well DFCO and save fuel and brakes.
2. DFCO to control speed on a long downhill.

__________________



11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
  Reply With Quote
Reply  Post New Thread


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Coasting in gear vs. neutral (fuel cut feature) WTFM8 Hypermiling / EcoDriver's Ed 28 05-29-2011 10:39 AM
Does coasting in neutral or coasting in gear save more gas? xbUser Hypermiling / EcoDriver's Ed 19 10-19-2008 01:28 PM
Coasting in Neutral... what if you can't come to a full stop after? Sean T. Hypermiling / EcoDriver's Ed 16 10-08-2008 12:11 PM
Coasting in Neutral Vs. Coasting in Drive observation fonque Hypermiling / EcoDriver's Ed 21 07-17-2008 03:49 PM
Neutral coasting vs In-Gear coasting Netherby Hypermiling / EcoDriver's Ed 1 06-13-2008 11:53 AM



Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com