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04-24-08, 09:43 AM
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 #1 (permalink)
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Forum Regular
Join Date: Sep 2004
Location: San Antonio, TX
Posts: 107
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OME Lift and decreased MPG - reasoning??
I ssearched and did not find any info.
I knew that installing a lift on my LC was going to result in decreased MPG. I just don't understand why this is so. Nothing changes mechanically, other than a slight increased angle at the front differential (note: I have a diff drop) but I don't see this as being the culprit. I was already running 285s before the lift, so tire size is not the culprit either.
I am left with aerodynamics, i.e more air allowed under the car and somehow increasing drag. But again, I fail to believe that this is the sole cause. Based the computer's calculated mileage, I dropped approx. 1.5 MPG for my daily driving pot lift.
What do ya'll think? Or maybe someone knows and can expound this issue for me.
__________________
'97 FZJ80 to '03 UZJ100 to (now) '05 UZJ100
Think I'm sticking with this one for awhile!
Now with: HIRs
OME 865s, OME t-bars, OME shocks, slee diff. drop
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04-24-08, 09:59 AM
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#2 (permalink)
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Forum Lifer
Join Date: Dec 2003
Location: Bay Area, CA
Posts: 4,376
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Increased frontal area.
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98 LX470
85 BJ70
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04-24-08, 10:11 AM
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#3 (permalink)
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Forum Lifer
Join Date: Jun 2003
Location: Cuyamaca, CA and Las Vegas, NV
Posts: 2,570
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There is more wind resistance. Maybe if you lowered it your mileage would increase  Other than the decrease in mileage, do you like the results?
Maybe 1loudlx can provide some feedback on that lowering thing?
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2000 UZJ100 - sold and missed like hell
Any Toyota 4x4 and hopefully soon
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04-24-08, 10:16 AM
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#4 (permalink)
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Site Addict
Join Date: Apr 2004
Location: Los Ángeles, CA.
Posts: 1,977
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Quote:
Originally Posted by FATrabbit
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I am left with aerodynamics...
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Quote:
Originally Posted by hoser
Increased frontal area.
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correct
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Looking for an FJ55.
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04-24-08, 10:38 AM
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#5 (permalink)
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Site Addict
Join Date: Apr 2003
Location: Tucson, AZ
Posts: 2,414
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I also think it's mainly increased frontal surface area, which includes the front between the bumper and the ground. Best way to increase fuel economy would be to drive 55-60mph on cruise or lower the vehicle. Best way for the latter would be one of those JDM AHC controllers that allows one to drop/raise the front/rear independently of one another in 10mm increments. The new LX basically does this (drops the vehicle at highway speed by a fixed amount, the front drops more than the rear) to regain some lost mpg's due to the increased engine displacement.
__________________
'03 LX470: ART slotted & cryo'd rotors, Porterfield R4s pads, Stoptech stainless hoses, ARB sahara & Kaymar bars, HID's.
'05 LS430 Ultra luxury edition: rear massage/heated&cooled seats, rear coolbox, side laminated glass w/ built-in window shades, suede headliner
'01 Prelude SH: bone stock
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04-24-08, 10:40 AM
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#6 (permalink)
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Mexican't
Join Date: Apr 2005
Location: San Antonio, Texas
Posts: 420
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wait until the 35's go on it......
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2000 uzj100
1995 Fzj80 Pearl Gray mallcruiser with damage multipliers front and back
scale: 1/4"=1'-0"..........
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04-24-08, 11:26 AM
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#7 (permalink)
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Forum Regular
Join Date: Sep 2004
Location: San Antonio, TX
Posts: 107
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Quote:
Originally Posted by calamaridog
Other than the decrease in mileage, do you like the results?
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Of course I like the results! Wouldn't go back (or lower) for anything, just curious. I have a 400 mile highway trip this afternoon, so I will able to see what the highway MPG is post lift. Probably end up cleaning the MAF.
__________________
'97 FZJ80 to '03 UZJ100 to (now) '05 UZJ100
Think I'm sticking with this one for awhile!
Now with: HIRs
OME 865s, OME t-bars, OME shocks, slee diff. drop
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04-24-08, 11:56 AM
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#8 (permalink)
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Rollin‘ on 33s...
Join Date: Jun 2004
Location: Brooklyn, Edgartown, Oak Bluffs
Posts: 3,856
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Quote:
Originally Posted by calamaridog
Maybe 1loudlx can provide some feedback on that lowering thing?
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Though he did wheel last weekend which is more than you can say for me. 
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1981 FJ60 - 210K, OME, 33" BFG ATs, Surco Safari Roof Rack with custom Rod Racks, MAF header, Flowmaster Super 44 muffler.
2002 UZJ100 - 50K, OME 865, OME T-Bars, Slee Diff Drop, TJM T-15 AL, TJM RB8, TJM Rear Tyre Carrier, Toyo OC ATs, Warn Winch, AO Roof Rack, IPF 900s, PIAA 520s and 510s, Borla CAT back with SLP muffler.
Gotham City Land Cruisers
Yankee Toys
Bay to Blue Ridge Cruisers
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04-25-08, 01:10 AM
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#9 (permalink)
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Site Addict
Join Date: Feb 2004
Location: Left Coast, USA
Posts: 2,016
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Quote:
Originally Posted by Jim_Chow
I also think it's mainly increased frontal surface area, which includes the front between the bumper and the ground.
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Plus increased frontal exposed surface area of all four tires.
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Derek Lee
`81 G-Wagen (460.333), `04 Land Cruiser (UZJ100)...plus some other junk...
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04-25-08, 01:57 AM
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#10 (permalink)
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Site Addict
Join Date: Aug 2006
Location: Tyler, Texas
Posts: 1,768
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35s.... roof rack.... bumpers...... I think when my own mods get done, I'll be riding a VESPA and letting the 100 sit for weekends 
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2004 Land Cruiser UZJ100 "The Warpig" (cue Black Sabbath)
100 Owners Guild-
Expedition wheelers at their finest - wheeling with style...
The not so secret, secret society of 100 owners.... 
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04-25-08, 04:58 AM
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#11 (permalink)
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250+ Club
Join Date: Feb 2004
Location: Sandia Park, New Mexico
Posts: 884
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Quote:
Originally Posted by Jim_Chow
I also think it's mainly increased frontal surface area, which includes the front between the bumper and the ground. Best way to increase fuel economy would be to drive 55-60mph on cruise or lower the vehicle. Best way for the latter would be one of those JDM AHC controllers that allows one to drop/raise the front/rear independently of one another in 10mm increments. The new LX basically does this (drops the vehicle at highway speed by a fixed amount, the front drops more than the rear) to regain some lost mpg's due to the increased engine displacement.
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I disagree with the driving with the cruise control on. I’ve gotten worse using the cruise due to the cruise hammering the throttle to increase/maintain speed. But maybe its better at 55-60, I don’t know, I have never driven at that speed with cruise on.
~DMX
__________________
I may be vile and pernicious But you can't look away
I make you think I'm delicious With the stuff that I say
I am the best you can get Have you guessed me yet?
I am the slime oozin' out From your TV set"
I'm The Slime by Frank Zappa, 1973
98 Land Cruiser
01 Beta trials bike
71 GMC Shortwide truck
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04-25-08, 11:02 AM
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#12 (permalink)
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Forum Lifer
Join Date: Dec 2003
Location: Bay Area, CA
Posts: 4,376
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Quote:
Originally Posted by Jim_Chow
The new LX basically does this (drops the vehicle at highway speed by a fixed amount, the front drops more than the rear) to regain some lost mpg's due to the increased engine displacement.
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The LX570 also has a coefficient of drag of .35 vs .40 for the LX470. Not sure if that figure is with the auto lowering suspension activated though.
__________________
98 LX470
85 BJ70
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04-25-08, 11:24 AM
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#13 (permalink)
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Comfortably Numb
Join Date: May 2007
Location: NE Atlanta, GA
Posts: 318
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The lift also causes more turbulence under the vehicle which adds to its drag.
I'm currently working on some easily removable attachments for the front of my rig that would help with on highway air flow; not sure if it'll do much good, but it can't hurt.
__________________
2005 UZJ100
OME T-Bars, OME 2" 'Heavy' Lift Kit, Slee Diff Drop, ARB Combo Bumper, Warn XD9000, Slee Rear Bumper w/Tire Carrier, Slee Sliders
I know the voices aren't real, but sometimes they have good ideas...
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04-25-08, 11:36 AM
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#14 (permalink)
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Forum Lifer
Join Date: Dec 2003
Location: Bay Area, CA
Posts: 4,376
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__________________
98 LX470
85 BJ70
Last edited by hoser; 04-25-08 at 11:42 AM.
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hoser
