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Old 02-20-2008, 11:17 AM   #11 (permalink)
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Location: Tooele, UT
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ZJ - '95 Jeep Grand Cherokee Laredo Upcountry
90 day: 20.57 mpg (US)

Neon - '03 Dodge Neon SE
90 day: 33.46 mpg (US)

S'Crew - '02 Ford F150 Supercrew XLT
90 day: 16.4 mpg (US)

Ranger - '90 Ford Ranger
Last 3: 28.02 mpg (US)

Not the Jeep - '03 Dodge Neon SE
90 day: 34.11 mpg (US)
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Shouldn't be a problem. Only 2 upgrades I know of, from the Chevy version of the case. 1/2" wider chain and 6 planetaries instead of three in the rangebox section. But I've seen built v8s in front of the 231 with no problems. A beefed up version of the NV242 was in early Hummer H1s...

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Old 02-20-2008, 10:44 PM   #12 (permalink)
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Join Date: Dec 2007
Location: The Dale, IL (or A-Dale)
Posts: 1,120

The Jeep! - '95 Jeep Grand Cherokee ZJ Laredo
90 day: 23.75 mpg (US)

The Caliber - '07 Dodge Caliber R/T
90 day: 30.6 mpg (US)

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well, it's pretty off topic, but I went and had some fun in the mud today I always got free of the muds hold at around 3k rpm. anyway, back to the discussion.

Aside from doing tranny swaps and etc. I must ask what type of driving do you do? Highway? City? Back Country? All this will help determine what you should do.

If you drive in the city, you wanna probably forget the aero mods and things, and concentrate on lightening up as much as possible. get rid of those dead bodies and baseball bats! also, adding air in the tires offers less rolling resistance, therefore lessening the load your engine has to do. Running with the Jeep warm will help ALOT. Less rolling resistance because the tires are warmed, engine isn't running cold (using more fuel to warm it up when it's cold) the tranny fluid isnt really thick, wheel bearings aren't cold and therefore you go easier. Parking where you don't have to use reverse helps alot in FE as well, so park backward or pull through at the store while the engine is warm, so when it's cold, you don't have to back out. Parking in the shade when it's hot and the sun when it's cold to minimize the use of A/C and heat, and to help you keep cooler or warmer faster. Instrumentation helps too, because knowing what mileage your getting on each part of your daily drive can help maximize how you drive everyday. Changing your fluids to the lowest viscosity helps with engine and tranny resistance.

For highway, it's all about aero, and less rolling resistance. grille blocks dominate the scene, as well as underbelly trays, and low viscosity fluid helps lower your resistance as well. lightening weight helps too, but more for the city where your constantly stopping and going. Running warm helps too, and mostly all the tips for the city, helps for highway.

Needless to say, it helps to know this so we can concentrate on what you should do first instead of just guessing.
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Old 02-21-2008, 05:51 PM   #13 (permalink)
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Join Date: Feb 2008
Location: Omaha Nebraska area
Posts: 271

Civic - '98 Honda Civic DX
90 day: 41.44 mpg (US)
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mostly highway driving. some intown when needed...usualy take the wifes kia for alot of around town stops.

My concern is about summer time if I block off the grill...how much can I block and not over heat? I'll probably switch to a high efficency fan in the some what near future, and add some red line watter wetter. I'm also considering switching my fluids to royal purple...or valvoline synthetics because I've heard so much about the reduction in resistance in the drive train.
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Old 02-21-2008, 07:40 PM   #14 (permalink)
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Civic - '98 Honda Civic DX
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do you guys know which factory wheels are lighter?

the regular 15" 5 spokes?

http://cgi.ebay.com/ebaymotors/Jeep-...spagenameZWDVW

also will the 99 and up split 5 spokes fit and are they lighter?

http://cgi.ebay.com/ebaymotors/JEEP-...spagenameZWDVW

what about these?

http://cgi.ebay.com/ebaymotors/15-Je...spagenameZWDVW

would these fit?

http://cgi.ebay.com/ebaymotors/15-8-...spagenameZWDVW
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Old 02-21-2008, 09:45 PM   #15 (permalink)
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Join Date: Dec 2007
Location: The Dale, IL (or A-Dale)
Posts: 1,120

The Jeep! - '95 Jeep Grand Cherokee ZJ Laredo
90 day: 23.75 mpg (US)

The Caliber - '07 Dodge Caliber R/T
90 day: 30.6 mpg (US)

The 'Scort - '98 Ford Escort LX
Thanks: 0
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I actually think that the 93-95 rims would be the best for aero because they are the most smooth and have the least amount of holes. It's probably not the lightest in the group.

I'm pretty sure that in 99 they changed the lug spread and they won't fit, I don't know about the wrangler ones, but they are 8 inch rims, and I'm pretty sure that the ZJ has 7 inch wide rims.

the waffle rims would probably be lighter than the 93-95's.

I don't think you'll overheat the car, for one, when I go muddin, my temp doesn't really rise, 10 degrees maybe, and that's with a grille block. but that's winter.

To judge how much to block, just block off a little at a time, and when you see it start to overheat, take back some of the block. One thing is, definitely block off the grille hole where the air intake is, mine is the very left (driver side) grille slot. Even though it doesn't get air directly from there (if you look, it takes it from the side) it still prevents air from getting in that part of the cabin and lets warmer air go in, warming the engine about 20-30 degrees.

Really, you'd have to look at weight first, then consider aero, because the lightest rim can still get pizza pans put on if it's not aero.

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