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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 06-22-2020, 03:26 AM   #1 (permalink)
EcoModding Lurker
 
AdrianD's Avatar
 
Join Date: Apr 2012
Location: Overseas
Posts: 53
Thanks: 3
Thanked 22 Times in 17 Posts
Jeep transfer case swap - preliminary fe data

I've replaced the full-time transfer case in my WJ with a part-time one from a KJ, which allows me to run in 2wd mode and the entire crossmember and transfer case are now tucked in higher (40mm) for better off-road clearance. That might also help with aero drag under the car.

Stock:


Now:


The stock transfer case had way more "drag" between the front and rear output flanges than I imagined and the fuel consumption data is interesting:

Average fuel consumption (city, two-lane roads, some light offroading), with airdam, street tires and standard transfer case, over 750 miles:
21.09 MPG

Average fuel consumption (including about 50 miles of offoading), with the new transfer case, 32 inch mud tires, no airdam and chopped bumper, over 300 miles:
21.22 MPG

If I account for the tire size difference, which is 9.3%, it would mean I traveled more than what the odometer reads, which brings the fuel consumption to 22.55 MPG

That looks like there were some solid gains from the transfer case swap, enough to offset the aero differences and drag differences from the mud tires, or am I interpreting this wrong?

Mud tires vs street tires:


Last edited by AdrianD; 06-22-2020 at 03:54 AM..
  Reply With Quote
The Following 2 Users Say Thank You to AdrianD For This Useful Post:
California98Civic (06-22-2020), Ecky (06-22-2020)
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 06-22-2020, 10:12 AM   #2 (permalink)
Master EcoModder
 
Ecky's Avatar
 
Join Date: Dec 2011
Location: Vermont
Posts: 3,948

Gaptooth (retired) - '00 Honda Insight
Team Honda
Gen-1 Insights
90 day: 54.26 mpg (US)

Such Fit - '07 Honda Fit Sport
90 day: 41.27 mpg (US)

Connect - '15 Ford Transit Connect XL
90 day: 23.78 mpg (US)

K-sight - '00 Honda K-sight
Team Honda
90 day: 42.99 mpg (US)
Thanks: 1,705
Thanked 1,669 Times in 1,065 Posts
Yikes! That's a lot of drivetrain drag. Nice mod!

In other words, it looks like that old transfer case its burning around 1 gallon of gasoline per 320 miles, assuming the tires added no extra drag.
  Reply With Quote
Old 06-22-2020, 10:50 AM   #3 (permalink)
EcoModding Apprentice
 
Join Date: Jul 2015
Location: Louisiana
Posts: 235
Thanks: 141
Thanked 82 Times in 66 Posts
Too many variables to draw any conclusion, IMHO.
__________________
  Reply With Quote
Old 06-22-2020, 11:20 AM   #4 (permalink)
Cyborg ECU
 
California98Civic's Avatar
 
Join Date: Mar 2011
Location: Coastal Southern California
Posts: 5,764

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 66.42 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
Thanks: 2,147
Thanked 1,852 Times in 1,262 Posts
Nice work! On your question.... I also think there are too many uncontrolled variables in your test, BUT there is no way to A-B-A test such a mod AND the data you have is suggestive of what we might expect, so keep tracking your fuel economy. If it's working nicely you should usually see better FE in similar driving conditions. Keep a fuel log here at EM so we can see your progress.
__________________


See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.

  Reply With Quote
Old 06-22-2020, 11:48 AM   #5 (permalink)
EcoModding Lurker
 
AdrianD's Avatar
 
Join Date: Apr 2012
Location: Overseas
Posts: 53
Thanks: 3
Thanked 22 Times in 17 Posts
I'm tracking my fuel consumption by an app called Fuelio and when I filled up yesterday I was expecting to see 18-19 MPG at best. I wonder if I can add all the historic data in the log here.

An extra improvement was losing 70 lbs of weight (left is new, right is old):


I'm curious to compare with the street tires and aero mods, but it will have to wait until August for data, until then I have offroad trips planned.

As for comparison, this WJ has shown slightly worse highway mileage than my old one, same engine and same aero mods. Maybe the transfer case on this new WJ one had a lot more drag than the old WJ one.

Not even a close comparison, but in my old WJ I had a trip which was 200 miles highway, 80 miles offroad and I averaged 18.66 MPG. Smaller mud terrain tires and no aero.
  Reply With Quote
The Following User Says Thank You to AdrianD For This Useful Post:
California98Civic (06-22-2020)
Old 06-22-2020, 01:31 PM   #6 (permalink)
Cyborg ECU
 
California98Civic's Avatar
 
Join Date: Mar 2011
Location: Coastal Southern California
Posts: 5,764

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 66.42 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
Thanks: 2,147
Thanked 1,852 Times in 1,262 Posts
There has got to be a way to upload an FE data file, but I just checked and did not see a way. Anyone else know how?
__________________


See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.

  Reply With Quote
Old 06-22-2020, 02:18 PM   #7 (permalink)
EcoModding Lurker
 
AdrianD's Avatar
 
Join Date: Apr 2012
Location: Overseas
Posts: 53
Thanks: 3
Thanked 22 Times in 17 Posts
I can do it manually, I've only owned it for two years.

  Reply With Quote
Reply  Post New Thread


Thread Tools




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