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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 07-06-2012, 08:39 AM   #11 (permalink)
EcoModding Apprentice
 
Join Date: Sep 2011
Location: Columbus, Ga
Posts: 154

Whitey - '10 Ford Ranger XL
Pickups
90 day: 33.74 mpg (US)

Hershey - '13 Nissan Altima SL
90 day: 28.68 mpg (US)

Midas - '10 Toyota Prius two
Thanks: 15
Thanked 14 Times in 10 Posts
my scangauge reports a LOD of about 20 while I am gliding, with AC on or the alternator going, or the lights on, or the fan running it gets up to the low 30s. So is there a way to zero my scangauge to read idle as LOD0?

Anyways idle out of gear wouldn't the engine still be doing some work? Moving the pistons, valves, sucking in air, oil and fuel pumps, and all the parasites on the timing belt. And wouldn't that work be getting down at a very inefficient load? Explaining why it takes 30 LOD to idle the engine and use AC, but 70 to have the tranny in gear and accelerate to highway speed.

__________________


Check out my facebook page, if you feel like watching my progress.
http://www.facebook.com/pages/MPGran...007268?sk=wall
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 07-06-2012, 01:44 PM   #12 (permalink)
NightKnight
 
NachtRitter's Avatar
 
Join Date: Dec 2008
Location: Placerville, CA
Posts: 1,594

RippinRoo - '05 Subaru Legacy Wagon 2.5 GT
Subaru
90 day: 21.16 mpg (US)

Helga - '00 Volkswagen Jetta TDI
TEAM VW AUDI Group
Diesel
90 day: 53.91 mpg (US)

Olga - '03 Volkswagen Jetta Wagon
90 day: 46.24 mpg (US)
Thanks: 303
Thanked 311 Times in 186 Posts
Is that what is meant by Tip #88? Light load = idle? I thought 'light load' meant something like driving in gear on a level road... in other words, running at the 'cruising' rpm, not at idle.
  Reply With Quote
Old 07-07-2012, 01:10 PM   #13 (permalink)
herp derp Apprentice
 
Join Date: Oct 2008
Location: Lawrence, KS
Posts: 1,049

Saturn-sold - '99 saturn sc1
Team Saturn
90 day: 28.28 mpg (US)

Yukon - '03 GMC Yukon Denali
90 day: 13.74 mpg (US)
Thanks: 43
Thanked 331 Times in 233 Posts
this might also vary from vehicle to vehicle. for underpowered vehicles, or vehicles where running the a/c makes a noticeable difference in performance, there could be an indirect affect. i have about a half mile long steep hill on my commute right now, with the a/c on i cant maintain 4th gear up the hill. even hitting the base of the hill at 65 i drop under 40, and out of 4th gear, by the top. with the a/c off i can maintain speed up the hill. same applies to a variety of situations for me, cutting the a/c can either allow the trans to shift earlier, or hold a higher gear.
  Reply With Quote
Old 07-07-2012, 03:34 PM   #14 (permalink)
EcoModding Lurker
 
Join Date: Apr 2009
Location: n/a
Posts: 60

TBA - '07 Honda Fit
Thanks: 11
Thanked 9 Times in 6 Posts
There are other factors that might come into play to really skew these results.

For instance, in my car, when I have the A/C on it takes more pressure on the pedal to get up to the same speed as if the A/C were off.

With that said, the A/C almost forces me to drive slower and with less pressure on the throttle, thereby making it impossible to accurately judge exactly how much of a load it is putting on the engine.
  Reply With Quote
Old 07-08-2012, 10:12 PM   #15 (permalink)
EcoModding Apprentice
 
Join Date: Sep 2011
Location: Columbus, Ga
Posts: 154

Whitey - '10 Ford Ranger XL
Pickups
90 day: 33.74 mpg (US)

Hershey - '13 Nissan Altima SL
90 day: 28.68 mpg (US)

Midas - '10 Toyota Prius two
Thanks: 15
Thanked 14 Times in 10 Posts
Quote:
Originally Posted by HilseeJ View Post
There are other factors that might come into play to really skew these results.

For instance, in my car, when I have the A/C on it takes more pressure on the pedal to get up to the same speed as if the A/C were off.

With that said, the A/C almost forces me to drive slower and with less pressure on the throttle, thereby making it impossible to accurately judge exactly how much of a load it is putting on the engine.
Do you have a scangauge or ultragauge? I can sit at 70LOD all day, pedal pressure varies. Going uphill and downhill are two very big variables. Also AC, which is why I started the thread, hoping someone already thought of this.
__________________


Check out my facebook page, if you feel like watching my progress.
http://www.facebook.com/pages/MPGran...007268?sk=wall
  Reply With Quote
Old 07-09-2012, 09:00 AM   #16 (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
NachtRitter- Sorry, I was reading "light/DFCO" to mean "idle/engine braking" and "moderate/heavy" as "cruising/accelerating."

I do as little constant load cruising as possible, and with my hills that means almost none. About the only time that I'm not actively P&Ging is when my wife calls me. As terrain dictates I'll have light pulses, but my goal is to either be on or off.

I'm still new at this (just over a year) and the roads I live on don't lend themselves to refining my technique away from hard P&G. With my P&G mindset if I'm not putting a real load on it then I shouldn't be putting any load on it at all, and with that kind of operation I'll try to pulse the compressor along with the rest of the car.
__________________

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
Old 07-09-2012, 12:41 PM   #17 (permalink)
NightKnight
 
NachtRitter's Avatar
 
Join Date: Dec 2008
Location: Placerville, CA
Posts: 1,594

RippinRoo - '05 Subaru Legacy Wagon 2.5 GT
Subaru
90 day: 21.16 mpg (US)

Helga - '00 Volkswagen Jetta TDI
TEAM VW AUDI Group
Diesel
90 day: 53.91 mpg (US)

Olga - '03 Volkswagen Jetta Wagon
90 day: 46.24 mpg (US)
Thanks: 303
Thanked 311 Times in 186 Posts
Not a problem... you thought it was one way & I thought it was another, but I don't think the correct answer has been provided yet (at least not in this thread).

In any case, whatever it is you actually are doing is certainly the right thing, based on the FE you are getting with the car you are driving, and that is really all that matters...
  Reply With Quote
Old 07-09-2012, 03:03 PM   #18 (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
And that's why the "correct answer" is so vague!
__________________

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
Old 07-09-2012, 07:06 PM   #19 (permalink)
Intermediate EcoDriver
 
Mustang Dave's Avatar
 
Join Date: May 2009
Location: Northern Arizona - It's a DRY cold..
Posts: 671

Trigger - '07 Ford Mustang V6 Premium Coupe
Team Mustang
Sports Cars
90 day: 32.76 mpg (US)

Big Red (retired) - '89 Ford F-250 4wd Custom
90 day: 18.13 mpg (US)

Big Red II - '13 Ford F-150 FX4
Pickups
90 day: 19.61 mpg (US)
Thanks: 163
Thanked 129 Times in 102 Posts
It all depends on the driving conditions. I rarely use AC, except on road trips through/to hotter places. Last year on my road trip to southern California, I tried "P&G" with my AC. Kept the "recirculating" switch on. I tried to engage the compressor only on level or downhill stretches. Another method I tried this year was engaging the compressor only when instantaneous MPG on my ScanGauge was higher than Tank Average MPG on my Mustang's information display. If it gets too hot for comfort, AC stays on.

__________________
Fuel economy is nice, but sometimes I just gotta put the spurs to my pony!



Quote:
Originally Posted by thatguitarguy View Post
Just 'cuz you can't do it, don't mean it can't be done...
Quote:
Originally Posted by elhigh View Post
The presence of traffic is the single most complicating factor of hypermiling. I know what I'm going to do, it's contending with whatever the hell all these other people are going to do that makes things hard.
  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