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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 05-27-2010, 06:02 PM   #211 (permalink)
Master EcoModder
 
Join Date: Jan 2009
Location: Maui, Hawaii
Posts: 813
Thanks: 5
Thanked 33 Times in 26 Posts
BTW it might be worthwhile to try higher octane. Someone posted on NAXJA that his manual said to use higher octane gas at high temperatures, towing, etc. Mine doesn't say that, but I've tried 93 octane and got higher gas mileage... Like 18mpg instead of 16mpg. It wasn't scientific though because I had to fill up at a different gas station.

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 05-30-2010, 07:34 PM   #212 (permalink)
EcoModding Lurker
 
Join Date: May 2010
Location: georgia
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Im glad this thread is still alive. I have a 98 Grand Cherokee and I first noticed this page last year. Im planning on doing some aero mods. Right now im getting about 22 mpg but I can get up to 26 if i stay at 55mph. I just hate driving slow. I have a scangauge and frequently go on 900 mi trips in the 238,000 mi Grand. maybe Ill make a new thread but for now im thinking about grabbing some sheet metal and starting after I make the 450 mi trip home.

Good job on the cherokee!!! Im looking forward to saving money on gas following your example.
  Reply With Quote
Old 05-30-2010, 08:01 PM   #213 (permalink)
Jeep Ecomodder
 
JeepNmpg2's Avatar
 
Join Date: Aug 2009
Location: Georgia
Posts: 160

Daddy's Jeep - '00 Jeep Cherokee SE
90 day: 19.66 mpg (US)

Mama's Kia - '06 Kia Sedona LX
Thanks: 16
Thanked 24 Times in 13 Posts
Cool Poke @ FastPlastic

Not that I have any room to talk, but have you gotten any further with modding your Cherokee? I still have to say that your WAI is ingenious, I need to figure out a way to make that work with my hacked K&N airbox!
  Reply With Quote
Old 06-06-2010, 04:44 AM   #214 (permalink)
Master EcoModder
 
FastPlastic's Avatar
 
Join Date: May 2008
Location: Ames, IA
Posts: 419

98 Cherokee - '98 Jeep Cherokee
90 day: 17.18 mpg (US)

ZX7R Ninja - '99 Kawasaki ZX7R Ninja
90 day: 42.45 mpg (US)
Thanks: 4
Thanked 13 Times in 12 Posts
Just pulled one of the highest yet! 19.219MPG's! Most of this was in town driving. I'd say I had maybe 25-40miles of the 339.2miles out on the highway across town. Several of the trips through town I pulled 22MPG's.

JeepNmpg2,
Haven't really had time to work on anything but the nut behind the wheel. Just bought a house, so I've been spending all of my time working on that instead.

winkosmosis,
I've heard many talk about heat soak as a problem. So far I haven't seen any signs of it in my case. Could be the fact that I only do a partial warm air intake. So I pull maybe 1/2 of the air from near the exhaust and the other half from the front of the jeep. Giving me a nice toasty intake, yet not overly hot. My engine temps rarely ever go over 209F and even then for only about 10-15seconds as the electric fan drops it back down. The highest intake temp I've seen was 159F with it typically running between 115F-135F.

I have tried the higher octane. It did push the MPG's up a bit, but after doing the math to figure out the savings I found it to be counter-productive. Instead, I have found in my case a bottle of Iso-Heet(yellow bottle seems to work best for me) boosts my MPG's enough to be worth the $1 I pay per bottle for the 4 packs at Wal-Mart.
__________________

Adjusted for my driving habits. 80%city/20%Highway.
20mpg city/30mpg highway or bust! Check out my mods so far
  Reply With Quote
Old 06-19-2010, 07:25 PM   #215 (permalink)
EcoModding Apprentice
 
XJguy's Avatar
 
Join Date: Jun 2010
Location: NY
Posts: 135
Thanks: 9
Thanked 43 Times in 24 Posts
Two things

Many years ago, back in the 80's when the XJ was going through police trials, it was deemed the best performer even better than the Crown Vic's in every way, the article was in Motor-Trend I think. At any rate they touched upon the aerodynamics of the XJ, and they said that in spite its boxy appearance it was not as bad in the wind as one might think due to its small overall size. However they said the large side mirrors, huge wheel gaps and relatively enormous fender flares really took a toll on its aero package. You might want to investigate ways to remedy those issues.
  Reply With Quote
The Following User Says Thank You to XJguy For This Useful Post:
aerohead (06-21-2010)
Old 05-05-2011, 05:32 AM   #216 (permalink)
Master EcoModder
 
FastPlastic's Avatar
 
Join Date: May 2008
Location: Ames, IA
Posts: 419

98 Cherokee - '98 Jeep Cherokee
90 day: 17.18 mpg (US)

ZX7R Ninja - '99 Kawasaki ZX7R Ninja
90 day: 42.45 mpg (US)
Thanks: 4
Thanked 13 Times in 12 Posts
So now that it's warmed up and gas is on it's way up again($3.89 today) I hope to look in to a few more mods on the old Jeep. One major modification I made recently is my big move. Got married in Nov and bought a house closer to work. So my 4 mile commute one way is now only 2 miles. An interesting side affect is my MPG's are dropping due to the shorter trips, the engine just doesn't have time to even warm up before I'm there. Good news is from my calculations its a decrease in gas used. I'll keep you posted on what I add.
__________________

Adjusted for my driving habits. 80%city/20%Highway.
20mpg city/30mpg highway or bust! Check out my mods so far
  Reply With Quote
Old 05-05-2011, 08:20 AM   #217 (permalink)
Moderate your Moderation.
 
Join Date: Nov 2008
Location: Troy, Pa.
Posts: 8,919

Pasta - '96 Volkswagen Passat TDi
90 day: 45.22 mpg (US)
Thanks: 1,369
Thanked 430 Times in 353 Posts
Might I suggest a house warming self gift of a bicycle? 2 miles is almost walking distance...
__________________
"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"

  Reply With Quote
Old 05-05-2011, 01:43 PM   #218 (permalink)
Master EcoModder
 
comptiger5000's Avatar
 
Join Date: Feb 2010
Location: CT, USA
Posts: 544

RaceJeep - '98 Jeep Grand Cherokee (ZJ) 5.9 Limited
90 day: 13.62 mpg (US)
Thanks: 1
Thanked 26 Times in 23 Posts
^ Agreed. In the warm weather, that would work nicely. Plus, the short trips where the engine doesn't get warmed up well enough aren't exactly good for the Jeep.
__________________
Call me crazy, but I actually try for mpg with this Jeep:



Typical driving: Back in Rochester for school, driving is 60 - 70% city
  Reply With Quote
Old 05-05-2011, 02:33 PM   #219 (permalink)
Master EcoModder
 
JRMichler's Avatar
 
Join Date: Feb 2011
Location: Phillips, WI
Posts: 964

Nameless - '06 GMC Canyon
90 day: 35.08 mpg (US)
Thanks: 185
Thanked 388 Times in 250 Posts
Two miles.
30 to 35 minutes walking.
7 to 10 minutes bicycling.
  Reply With Quote
Old 05-05-2011, 03:42 PM   #220 (permalink)
Master EcoModder
 
FastPlastic's Avatar
 
Join Date: May 2008
Location: Ames, IA
Posts: 419

98 Cherokee - '98 Jeep Cherokee
90 day: 17.18 mpg (US)

ZX7R Ninja - '99 Kawasaki ZX7R Ninja
90 day: 42.45 mpg (US)
Thanks: 4
Thanked 13 Times in 12 Posts
Once the weather warms up at night I'm planning on switching to the Ninja. I absolutely love riding the bike, but feel guilty if I don't have a reason too. There are days that I wish I had a block heater for the Jeep to use during winter. But it's a more costly install considering I would also have to install an electrical outlet on the exterior of the house. Seems houses originally built in 1875 didn't have exterior outlets(go figure).

__________________

Adjusted for my driving habits. 80%city/20%Highway.
20mpg city/30mpg highway or bust! Check out my mods so far
  Reply With Quote
Reply  Post New Thread


Tags
low pressure kills mpg's

Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Aeromods V1.0 trikkonceptz Aerodynamics 50 10-14-2011 12:30 PM
Glides like a Brick Wall (Jeep Cherokee, GMC Pick-up) DonEaston Aerodynamics 22 10-26-2008 05:17 PM
jeep aero mod ideas johnpr Aerodynamics 22 08-27-2008 08:45 PM
mpg + jeep - thinking cap help? tkmd EcoModding Central 6 04-28-2008 10:15 PM
Off-Road Test: '08 Jeep Grand Cherokee (Rally Race) RH77 The Lounge 4 02-25-2008 04:59 PM



Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com