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Do those OEM spoilers do anything for gas mileage?
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'89 Grand Wagoneer
AW4 Swap -
Nothing for mileage (sticks up into the wind which adds drag). But hey, you won't suck exhaust into the rear window with it.Originally posted by '89_WagonDo those OEM spoilers do anything for gas mileage?
DD:
'71 Wagoneer
B350/TH400/D20
open knuckle D44 front
http://www.ifsja.org/forums/vb/showt...79#post1734879
Project:
December 1962 Panel Delivery 4x4, Stock
Pulled out of the woods in July 2023--hey, it rolls now https://forums.ifsja.org/core/images/smilies/tongue.png
https://forums.ifsja.org/forum/tire-...29#post2476527
Previous Rig:
Tan '88 Grand Wagoneer
.060 over 401, TBI, headers
http://www.ifsja.org/forums/vb/showt...77#post1734777Comment
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It forces air down the back of your rig, yes to keep exhaust fumes from swirling in behind you, keeps the back of your truck a bit cleaner and cuts the drag a little.
So multi purpose function for aerodynamics of the bricks' backside
'81 CJ5 Base, 258 I6, MC2100, T176 4 spd, 300 TC, D30 Front NT, 3.31, 2-Piece AMC 20 rear NT, 3.31, 4" high arc spring lift
'84 Grand Wagoneer, 401 V8 (.030 over), MC2150 HA Comp, 727 auto, Selec-trac NP229, AMC 20 REAR - D44 FRONT - WT 3.31, 4" high arc spring lift
Rather be driving, than waiting to be modifiedComment
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Well said - actually that whole post was spot on.Originally posted by FSJunkie
1973 Wagoneer, 4.6L Jeep inline 6 stroker, t176/d300, offy dualport w/ quadrajet, pertronix, flowmaster
"Roads? Where we're going we don't need roads." -- Doc Brown
"When this baby reaches 88 miles per hour, you're gonna to see some serious sh
t!"Comment
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To add my 2 cents - the best thing for MPG I did on my 1991 Grand Wagoneer was reinstating some of the factory vacuum junk. I spent a long time tuning the carb, plus sorting out the EGR.
With my rebuilt 360 bored .030" over, I get around 12 MPG driving hard on twisty, hilly roads.
Lots of short journeys around town obviously lowers this (to around 10 MPG), but equally I can get up to 14-15 MPG on a long trip, varying between 65-75mph.
I never expected to be able to beat the EPA estimates so easily, but the thing runs great!
The best part is that this was all free, except my time.1991 Grand Wagoneer - Hunter Green. All stock. Rebuilt 360, .030" over with Melling MTA-1 cam.
1998 Cherokee (XJ) 4.0
1997 Grand Cherokee (ZJ) 4.0
1974 Ford F100 390Comment
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That is what loving our FSJ's is all about
Originally posted by Brynjminjones'81 CJ5 Base, 258 I6, MC2100, T176 4 spd, 300 TC, D30 Front NT, 3.31, 2-Piece AMC 20 rear NT, 3.31, 4" high arc spring lift
'84 Grand Wagoneer, 401 V8 (.030 over), MC2150 HA Comp, 727 auto, Selec-trac NP229, AMC 20 REAR - D44 FRONT - WT 3.31, 4" high arc spring lift
Rather be driving, than waiting to be modifiedComment
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Don't mean to brag but my 1987 Grand Wagoneer is getting 16-20 mpg at 65-70 mph but I have made some changes. 360 with Howell Fuel injection, NV 4500 5-speed and front axle locking hubs.Last edited by conehead; 05-20-2022, 04:05 PM.Comment
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Nice setup'81 CJ5 Base, 258 I6, MC2100, T176 4 spd, 300 TC, D30 Front NT, 3.31, 2-Piece AMC 20 rear NT, 3.31, 4" high arc spring lift
'84 Grand Wagoneer, 401 V8 (.030 over), MC2150 HA Comp, 727 auto, Selec-trac NP229, AMC 20 REAR - D44 FRONT - WT 3.31, 4" high arc spring lift
Rather be driving, than waiting to be modifiedComment
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I put an O2 sensor in my 1966 Oldsmobile so I could tune the carb more accurately. I played with the power piston spring in my quadrajet and now it runs leaner at light throttle (15-15.5:1 cruising) and gets richer quickly under heavier throttle. I went from 11MPG highway to 14 MPG.
I was going to get an EFI unit, but I'm having second thoughts. In the end, it's very difficult for a carburetor to leave you stranded. Money very well spent on the O2 sensor.Last edited by Mikel; 05-23-2022, 07:16 AM.1969 M715 6x6
1963 J300 Swivel frameComment
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Agree with you 100%
And EFI will rarely improve MPG, only lets your old vehicle respond like a newer one, to turn key and go. No more warm up time for choke etc, and then "where do I put the computer screen" becomes an issue!
I'm carbing with you
'81 CJ5 Base, 258 I6, MC2100, T176 4 spd, 300 TC, D30 Front NT, 3.31, 2-Piece AMC 20 rear NT, 3.31, 4" high arc spring lift
'84 Grand Wagoneer, 401 V8 (.030 over), MC2150 HA Comp, 727 auto, Selec-trac NP229, AMC 20 REAR - D44 FRONT - WT 3.31, 4" high arc spring lift
Rather be driving, than waiting to be modifiedComment
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Another carb lover here too! I know they're not "better", but I feel like it suits the character of the vehicle better.
I don't think I'd enjoy driving it so much if it wasn't so stubborn at times
1991 Grand Wagoneer - Hunter Green. All stock. Rebuilt 360, .030" over with Melling MTA-1 cam.
1998 Cherokee (XJ) 4.0
1997 Grand Cherokee (ZJ) 4.0
1974 Ford F100 390Comment
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HAHAHAHAHAHAHA!!!!!!!Originally posted by Brynjminjones...I don't think I'd enjoy driving it so much if it wasn't so stubborn at timesChuck McTruck 71 J4000
(Chuck McTruck Build Thread)
(8.1L swap questions - PerformanceTrucks.net Forums)
79 Cherokee Chief (SOLD, goodbye old buddy)
(Cherokee Build Thread)
11 Nissan Pathfinder Silver Edition 4x4
09 Mazdaspeed3 Grand Touring
00 Baby CherokeeComment
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Just the "nature" of our beastsOriginally posted by BrynjminjonesAnother carb lover here too! I know they're not "better", but I feel like it suits the character of the vehicle better.
I don't think I'd enjoy driving it so much if it wasn't so stubborn at times
'81 CJ5 Base, 258 I6, MC2100, T176 4 spd, 300 TC, D30 Front NT, 3.31, 2-Piece AMC 20 rear NT, 3.31, 4" high arc spring lift
'84 Grand Wagoneer, 401 V8 (.030 over), MC2150 HA Comp, 727 auto, Selec-trac NP229, AMC 20 REAR - D44 FRONT - WT 3.31, 4" high arc spring lift
Rather be driving, than waiting to be modifiedComment
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Mostly I'm just too cheap for injection
I wouldn't mind injection; the electronics don't care about sitting or the temp or anything. But here we are.
I am a little surprised that hooking up all of the emissions stuff helped mileage, but whatever works
DD:
'71 Wagoneer
B350/TH400/D20
open knuckle D44 front
http://www.ifsja.org/forums/vb/showt...79#post1734879
Project:
December 1962 Panel Delivery 4x4, Stock
Pulled out of the woods in July 2023--hey, it rolls now https://forums.ifsja.org/core/images/smilies/tongue.png
https://forums.ifsja.org/forum/tire-...29#post2476527
Previous Rig:
Tan '88 Grand Wagoneer
.060 over 401, TBI, headers
http://www.ifsja.org/forums/vb/showt...77#post1734777Comment
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As designed they do not run too bad
Originally posted by sierrablueMostly I'm just too cheap for injection I wouldn't mind injection; the electronics don't care about sitting or the temp or anything. But here we are.
I am a little surprised that hooking up all of the emissions stuff helped mileage, but whatever works'81 CJ5 Base, 258 I6, MC2100, T176 4 spd, 300 TC, D30 Front NT, 3.31, 2-Piece AMC 20 rear NT, 3.31, 4" high arc spring lift
'84 Grand Wagoneer, 401 V8 (.030 over), MC2150 HA Comp, 727 auto, Selec-trac NP229, AMC 20 REAR - D44 FRONT - WT 3.31, 4" high arc spring lift
Rather be driving, than waiting to be modifiedComment
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