Go Back   EcoModder Forum > EcoModding > General Efficiency Discussion
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 06-12-2013, 02:55 PM   #21 (permalink)
Rat Racer
 
Fat Charlie's Avatar
 
Join Date: May 2011
Location: Route 16
Posts: 4,150

Al the Third, year four - '13 Honda Fit Base
Team Honda
90 day: 42.9 mpg (US)
Thanks: 1,784
Thanked 1,922 Times in 1,246 Posts
Quote:
Originally Posted by Xist View Post
How many car systems are designed with efficiency in mind?
The constant increasing of gear ratios in automatics has been for efficiency. Now they're going the other way- our minivan with a 6 speed has an "eco" button that keeps the torque converter locked longer and skips gears, giving it fewer gears- in a search for efficiency.

Again, it goes back to what an automatic is for. If you just shift into Dumb and go, then more gears will keep the engine closest to peak efficiency. If you're willing to use technique to increase mileage, the eco setting will alter the shift points and pattern to work with you. But it's still an automatic, and it's still going to always be in the gear it wants to be in instead of the gear you want it to be in.

__________________

Quote:
Originally Posted by sheepdog44 View Post
Transmission type Efficiency
Manual neutral engine off.100% @MPG <----- Fun Fact.
Manual 1:1 gear ratio .......98%
CVT belt ............................88%
Automatic .........................86%

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 06-12-2013, 03:29 PM   #22 (permalink)
Master EcoModder
 
euromodder's Avatar
 
Join Date: Jul 2010
Location: Belgium
Posts: 4,683

The SCUD - '15 Fiat Scudo L2
Thanks: 178
Thanked 652 Times in 516 Posts
Quote:
Originally Posted by Diesel_Dave View Post
That being said, a properly driven manual should never be beaten by an equivalent automatic.
Well, the folks who drive the cars on the official NEDC cycles are experts at hypermiling .
They can beat the manuals with (the best of the) dual clutch automatics.

Quote:
The biggest reason is that a good driver with a manual transmission can do one thing better than an automatic ever will--anticipate the future.
For the time being ...

Experiments with GPS (knowing terrain ahead, and elevation changes) and smart roads (like traffic lights communicating with cars) will likely end that - if countries can still afford smart roads, that is, my guess is they can't.
__________________
Strayed to the Dark Diesel Side

  Reply With Quote
Old 06-12-2013, 05:52 PM   #23 (permalink)
Hypermiler
 
PaleMelanesian's Avatar
 
Join Date: Dec 2007
Location: Texas
Posts: 2,321

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: 611
Thanked 433 Times in 283 Posts
No, the NEDC (and EPA) drivers are experts at driving cars in one very specific, controlled way every time. It turns out that specific driving cycle is more efficient than the average drivers' daily driving, but it is by no means the best of what's possible.
__________________



11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
  Reply With Quote
The Following User Says Thank You to PaleMelanesian For This Useful Post:
Diesel_Dave (06-13-2013)
Old 06-12-2013, 07:04 PM   #24 (permalink)
Master EcoModder
 
P-hack's Avatar
 
Join Date: Oct 2012
Location: USA
Posts: 1,408

awesomer - '04 Toyota prius
Thanks: 102
Thanked 252 Times in 204 Posts
Euromodder, There are obvious limitations and compromises even in the system you describe, and if the road train system is implemented with the same efficiency concerns as a regular automatic, it will be less than ideally efficient and we will have to all accept whatever efficiency the system allows (i.e. it probably won't let you p&g for better efficiency).

It won't "end that", it will simply move the problem to a different space.
  Reply With Quote
Old 06-12-2013, 07:28 PM   #25 (permalink)
...beats walking...
 
Join Date: Jul 2009
Location: .
Posts: 6,190
Thanks: 179
Thanked 1,525 Times in 1,126 Posts
road train system = common denominator principal of no better than the slowest unit.

  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