Go Back   EcoModder Forum > EcoModding > DIY / How-to
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 03-20-2013, 12:35 PM   #11 (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
Excellent work. With real data, I'm looking forward to seeing your next best tank. And the one after that...

__________________

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
The Following User Says Thank You to Fat Charlie For This Useful Post:
Diesel_Dave (03-20-2013)
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 03-20-2013, 02:21 PM   #12 (permalink)
Master EcoModder
 
Diesel_Dave's Avatar
 
Join Date: May 2011
Location: Indiana
Posts: 1,194

White Whale - '07 Dodge Ram 2500 ST Quad Cab 2wd, short bed
Team Cummins
90 day: 37.68 mpg (US)
Thanks: 112
Thanked 511 Times in 213 Posts
Quote:
Originally Posted by Fat Charlie View Post
Excellent work. With real data, I'm looking forward to seeing your next best tank. And the one after that...
Me too! If I assume I was off my the same amount last summer when I pulled my best tank ever of 47 mpg, adding 8.5% is 51 mpg. And since then I've made a few more mods.

I can't wait for it to warm up! That record tank was with an average temp of 78 deg F. My last was at 29 deg F.
__________________
Diesel Dave

My version of energy storage is called "momentum".
My version of regenerative braking is called "bump starting".

1 Year Avg (Every Mile Traveled) = 47.8 mpg

BEST TANK: 2,009.6 mi on 35 gal (57.42 mpg): http://ecomodder.com/forum/showthrea...5-a-26259.html


  Reply With Quote
Old 03-20-2013, 07:27 PM   #13 (permalink)
EcoModding Lurker
 
DieselX's Avatar
 
Join Date: Dec 2012
Location: Travel Trailer
Posts: 26

X - '02 Ford Excursion Limited
Thanks: 18
Thanked 1 Time in 1 Post
Hey Dave, on my diesel fords when you coast the pcm cuts fuel to the injectors. Do you see a big gain from cutting off the engine? My excursion is auto but my f250 is a 6sp. So I could try it on that.

I just wondered if the Dodge's cut fuel on coasting. You are obviously doing something right haha.
  Reply With Quote
Old 03-20-2013, 09:21 PM   #14 (permalink)
Master EcoModder
 
Diesel_Dave's Avatar
 
Join Date: May 2011
Location: Indiana
Posts: 1,194

White Whale - '07 Dodge Ram 2500 ST Quad Cab 2wd, short bed
Team Cummins
90 day: 37.68 mpg (US)
Thanks: 112
Thanked 511 Times in 213 Posts
Quote:
Originally Posted by DieselX View Post
Hey Dave, on my diesel fords when you coast the pcm cuts fuel to the injectors. Do you see a big gain from cutting off the engine? My excursion is auto but my f250 is a 6sp. So I could try it on that.

I just wondered if the Dodge's cut fuel on coasting. You are obviously doing something right haha.
It depends on what you mean by "coasting."

There's basically 3 options (in order of best fuel economy):
A) Coasting in neutral with engine off
B) Coasting in neutral with engine on (idling)
C) Coasting in gear with engine on

I do A. Virtually all computers will turn off fueling for C, but not B. One might be temped to think that C is better for fuel economy than B because C uses no fuel. The issue is that C robs energy from the vehicle because the wheels are being forced to motor the engine, overcoming all the friction and pumping losses at an engine speed significantly over idle speed. That's why it's also called "engine braking". Option B does use some fuel, but only enough to overcome pumping & friction at idle speed--and it doesn't brake the vehicle.
__________________
Diesel Dave

My version of energy storage is called "momentum".
My version of regenerative braking is called "bump starting".

1 Year Avg (Every Mile Traveled) = 47.8 mpg

BEST TANK: 2,009.6 mi on 35 gal (57.42 mpg): http://ecomodder.com/forum/showthrea...5-a-26259.html


  Reply With Quote
Old 03-21-2013, 08:38 AM   #15 (permalink)
EcoModding Lurker
 
DieselX's Avatar
 
Join Date: Dec 2012
Location: Travel Trailer
Posts: 26

X - '02 Ford Excursion Limited
Thanks: 18
Thanked 1 Time in 1 Post
I guess my question is if there is an advantage to engine off coasting vs. engine on coasting if the pcm cuts fuel when you coast. In nuetral of course.
  Reply With Quote
Old 03-21-2013, 08:44 AM   #16 (permalink)
Master EcoModder
 
Diesel_Dave's Avatar
 
Join Date: May 2011
Location: Indiana
Posts: 1,194

White Whale - '07 Dodge Ram 2500 ST Quad Cab 2wd, short bed
Team Cummins
90 day: 37.68 mpg (US)
Thanks: 112
Thanked 511 Times in 213 Posts
Quote:
Originally Posted by DieselX View Post
I guess my question is if there is an advantage to engine off coasting vs. engine on coasting if the pcm cuts fuel when you coast. In nuetral of course.
The computer can't cut fueling if you're coasting engine-on in neutral because there'd be nothing to keep the engine turning.
__________________
Diesel Dave

My version of energy storage is called "momentum".
My version of regenerative braking is called "bump starting".

1 Year Avg (Every Mile Traveled) = 47.8 mpg

BEST TANK: 2,009.6 mi on 35 gal (57.42 mpg): http://ecomodder.com/forum/showthrea...5-a-26259.html



Last edited by Diesel_Dave; 03-21-2013 at 09:04 AM..
  Reply With Quote
Old 03-21-2013, 08:52 AM   #17 (permalink)
EcoModding Lurker
 
DieselX's Avatar
 
Join Date: Dec 2012
Location: Travel Trailer
Posts: 26

X - '02 Ford Excursion Limited
Thanks: 18
Thanked 1 Time in 1 Post
Got you.. Been driving my automatic but thinking of my 6 speed haha.
  Reply With Quote
Old 03-21-2013, 09:38 AM   #18 (permalink)
Master EcoModder
 
mechman600's Avatar
 
Join Date: Jul 2008
Location: Langley, BC
Posts: 1,228

Fusion - '16 Ford Fusion Hybrid SE
Thanks: 190
Thanked 275 Times in 168 Posts
Diesel_Dave, your mileage astounds me. Imagine what you could do with something smaller like a VW TDI!

  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