Go Back   EcoModder Forum > EcoModding > EcoModding Central
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 05-10-2022, 09:58 PM   #441 (permalink)
EcoModding Lurker
 
Join Date: Apr 2008
Location: New Jersey
Posts: 39
Thanks: 1
Thanked 6 Times in 3 Posts
try BMW

BMW has been using a system for years that shuts off the alternator.
they claim a few % extra MPG.
The computer shuts off the alternator if battery charge is ~ 80%.
The other 20% kicks in the alternator when braking thus providing charge and some small regenerative / retarding effect.
The system has a name, but it escapes me now.

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 05-10-2022, 10:38 PM   #442 (permalink)
Human Environmentalist
 
redpoint5's Avatar
 
Join Date: Aug 2010
Location: Oregon
Posts: 11,079

Acura TSX - '06 Acura TSX
90 day: 28.24 mpg (US)

Lafawnda - '01 Honda CBR600 F4i
90 day: 47.32 mpg (US)

Big Yeller - '98 Dodge Ram 2500 base
90 day: 21.82 mpg (US)

Prius Plug-in - '12 Toyota Prius Plug-in
90 day: 57.64 mpg (US)

Mazda CX-5 - '17 Mazda CX-5 Touring
90 day: 25.39 mpg (US)

Chevy ZR-2 - '03 Chevrolet S10 ZR2
90 day: 17.14 mpg (US)
Thanks: 3,779
Thanked 4,095 Times in 3,106 Posts
Quote:
Originally Posted by sregord View Post
Having read this forum, It seems that a cleverly automated or manual switch on the alternator power lead(off up hill&level-on downhill) could be a fuel saverů. 10% would bring this up to- wow -almost 9 mpg.
Unfortunately it doesn't scale like that. Maybe disabling the alternator on a super efficient car like the Honda Insight could improve fuel economy by 10%, but electrical loads represent a smaller portion of total energy use in larger vehicles.

Kinda like how I could tell when my AC kicked on in my old and weak Subaru. AC represented a larger load on that vehicle than, say, my 7,000 lb Dodge Ram 2500 diesel.

That said, seems a worthwhile project since the solar is already installed and available to be utilized.
__________________
Gas and Electric Vehicle Cost of Ownership Calculator







Give me absolute safety, or give me death!
  Reply With Quote
Old 05-11-2022, 03:31 PM   #443 (permalink)
EcoModding Lurker
 
Join Date: Oct 2020
Location: Virginia City, NV
Posts: 60
Thanks: 49
Thanked 49 Times in 41 Posts
Thumbs up

Thank you... little bits here and there.
I was going down the 65+ Efficiency Mods ...& this one caught my eye.

Been working on my hyper-milling skills too.

Addressing aerodynamics of a big box? there could be some improvements, but not many. Been looking for a stream here that could be scaled up from a van.
So far the rear is "feathered" with the vortex generators, not sure if we've gained any efficiency, but being around semis has definitely improved.
  Reply With Quote
Old 05-11-2022, 04:25 PM   #444 (permalink)
Master EcoModder
 
freebeard's Avatar
 
Join Date: Aug 2012
Location: northwest of normal
Posts: 24,825
Thanks: 7,030
Thanked 7,911 Times in 6,473 Posts
Quote:
Addressing aerodynamics of a big box? there could be some improvements, but not many. Been looking for a stream here that could be scaled up from a van.
Like this?

https://www.dfrc.nasa.gov/Gallery/Ph...uck/index.html

I know aerohead has analyzed this in the past, here is one specific thread. ecomodder.com/forum/showthread.php/plan-my-cargo-trailer-30395.html#post453403

Long story short, the brick is the same on the underside. I posted about my design for a semi-rigid boat tail after you posted about the Trucksack in 2020.
__________________
.
.

Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster

____________________

Back in my day there was so much toilet paper and eggs that we would throw them at the houses of our enemies

____________________
  Reply With Quote
Old 05-11-2022, 08:43 PM   #445 (permalink)
EcoModding Lurker
 
Join Date: Oct 2020
Location: Virginia City, NV
Posts: 60
Thanks: 49
Thanked 49 Times in 41 Posts
Yes,
I have reviewed the NASA historical data.

Not sure this is the right Forum to continue this.
I'll get over to the "Class a motorhomes aerodynamics stream"
..and we can continue..?
  Reply With Quote
Old 05-16-2022, 01:38 PM   #446 (permalink)
Master EcoModder
 
Join Date: Mar 2010
Location: london, on
Posts: 327

Buggie - '01 Vw Beetle TDI Gls
Thanks: 3
Thanked 19 Times in 15 Posts
How about adding a super small crankshaft pulley and larger pulleys on both the water pump and alternator, a reverse under drive setup.
  Reply With Quote
Old 05-16-2022, 01:44 PM   #447 (permalink)
Master EcoModder
 
Phase's Avatar
 
Join Date: Mar 2022
Location: oregon
Posts: 722

Black Bullet - '19 Hyundai Ioniq Hybrid Blue
Thanks: 0
Thanked 375 Times in 313 Posts
Does the alternator work less hard when the 12v battery is fully charged?

  Reply With Quote
Reply  Post New Thread


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Project: Rebuilding an '01 Honda Insight as a nonhybrid Fabio Hybrids 158 01-12-2013 12:59 PM
How to get instant fuel consumption from Megasquirt TELVM Instrumentation 11 08-29-2011 03:47 PM
Kawasaki starts promoting its bikes' MPG ratings - best = 70 mpg MetroMPG Motorcycles / Scooters 35 09-10-2010 12:41 AM
Truck Trend claims 10% more MPG with K&N in 2009 Ford F-150 after bogus road test MetroMPG EcoModding Central 102 12-16-2009 07:45 PM
mpguino acted up today, lost mpg during fuel cut wagonman76 OpenGauge / MPGuino FE computer 9 06-17-2009 01:25 PM



Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2023, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com