My goal is to get 25+ mpg from my 99 XJ with 30 x 9.5 R15 ATs - Page 41 - JeepForum.com
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Unread 08-29-2013, 06:18 AM   #601
rav
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Quote:
Originally Posted by ninjakid View Post
Was browsing the internet and came across this.
http://www.naxja.org/forum/showthread.php?t=941439



A air dam from a blazer or jimmy is the right size for 96 and under at least (not sure about the later ones with the different bumper) and with some tweaks it'd blend right in I bet.
Extending the air dam has been something I've been wanting to do and this seems pretty easy provided you can find one.
That was my 95XJ and the air dam made it quite stable at free way speeds. That cherokee had the AW4 and I absolutely hated it. Picked up a 99 two door 5 speed yesterday and this will be the first mod I will do on it.

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Unread 08-29-2013, 06:44 AM   #602
ninjakid
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Quote:
Originally Posted by rav View Post

That was my 95XJ and the air dam made it quite stable at free way speeds. That cherokee had the AW4 and I absolutely hated it. Picked up a 99 two door 5 speed yesterday and this will be the first mod I will do on it.
Hope you don't mind me posting your pictures here without your permission.

Did you notice any improvements in mileage?

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Unread 08-29-2013, 06:47 AM   #603
Newtons3
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Quote:
Originally Posted by Charley3 View Post
It's prettier than a hot girl!
It's better than a hot chick!
It's like economoder porn for XJs!
Come on now. Theres a warm spot in my heart for hot girls and you and I must surf different porn. I am looking forward to your report back on this. I still predict minimal, if any, improvements. I hope you prove me wrong. I REALLY hope Im wrong about this.
Quote:
Originally Posted by JSahara00 View Post
That sounds like some boring driving. I love hills, you get to see how fast in neutral you can go down the other side.
It is. Boring that is.
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Unread 08-29-2013, 06:50 AM   #604
rav
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Quote:
Originally Posted by ninjakid View Post
Hope you don't mind me posting your pictures here without your permission.

Did you notice any improvements in mileage?

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No worries, I am glad you posted it. I did not drive that jeep on a regular basis and did not really track the mileage but whatever i lost in increasing the front area (more drag) was greatly offset by the fact the air flow in the undercarriage got a lot better.
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Unread 08-29-2013, 07:01 AM   #605
Newtons3
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Quote:
Originally Posted by RacerX View Post
..YES I have seen actual patents that actually heat (to a boil, I believe, ... maybe not all).
One I studied looked like a propane fuel system, but with a tank of gasoline vapor. Sounds dangerous, but it had a pretty thick tank.
I deal with propane carburetion and fuel injection every day. Ive actually got a lot of work experience with various heated fuels. Im not looking to boil the gas, Ill control that with fuel pressure. I was thinking that at the higher pressure and temperature, when the fuel is released from the injector it will atomize much better (if not vaporize). I dont think it is unsafe, just different. I think its probably safer than propane.
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Unread 08-29-2013, 11:27 AM   #606
Charley3
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Originally Posted by RacerX View Post
NOT exactly what I meant, ...however I expected you could figure out needed cleaning, grounding, insulation, pressure-relief.......
He might, but I wouldn't know to do those things. Few people would.

It's to dangerous if not none correctly. To much hassle if done correctly.

I wouldn't want to store 50 gal gasoline. No offense intended.
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Unread 08-29-2013, 11:35 AM   #607
Charley3
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Originally Posted by Newtons3 View Post
We have 4 hills here, the easements onto the Mississippi River bridges. The whole topography of the Baton Rouge area varies less than 50 ft. I believe. My last 95 was in awesome shape and was not stock, like most of what I own. It got an honest 18-19 around town as long as I didnt hurry. I got 21 every tank driving to work (about 75 percent highway @ 60 mph) and could eke out 22 with the cruise locked on 72 along the I-10 or I-55 corridor.
Sounds like my 96 XJ.
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Unread 08-29-2013, 11:47 AM   #608
Charley3
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Originally Posted by Newtons3 View Post
Come on now. Theres a warm spot in my heart for hot girls and you and I must surf different porn. I am looking forward to your report back on this. I still predict minimal, if any, improvements. I hope you prove me wrong. I REALLY hope Im wrong about this.
Hot girls are usually trouble and/or expensive. The air dam looks simple, easy, safe, and is affordable. I'd rather have the air dam. Unlike a hot chick, the air dam won't cause problems, will probably be helpful, and can't give me VD.

If the air dam improved his high speed handling (as he says) that proves it's preventing signifigant amounts of air/drag from under his XJ, which is evidence that it's improving aerodynamic efficieny. So better highway gas mileage is likely, IMO.

Also, this is a cheap, easy, good looking mod. My favorite kind of mod.

A cheap, easy, good looking woman will give you what? A fun time until the trouble begins and the VD symptoms show up.

The air dam is a safer choice, and I'll have fun with it. It might even save me money (on gas). When has a hot chick saved anyone money?
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Unread 08-29-2013, 01:12 PM   #609
bobthecatkiller
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Quote:
Originally Posted by JSahara00
That sounds like some boring driving. I love hills, you get to see how fast in neutral you can go down the other side.
lol we have a hill out in Windsor NY I hit 75 in neutral, going down it.
Instant mpg readings where at 99 lol
Hills can get annoying, my girl use to live on top of a hill that my old zj with the i6 struggled to get up, but it still averaged 14mpg going up that hill everyday.
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Unread 08-29-2013, 01:20 PM   #610
Newtons3
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Quote:
Originally Posted by Charley3 View Post
Hot girls are usually trouble and/or expensive. The air dam looks simple, easy, safe, and is affordable. I'd rather have the air dam. Unlike a hot chick, the air dam won't cause problems, will probably be helpful, and can't give me VD.

If the air dam improved his high speed handling (as he says) that proves it's preventing signifigant amounts of air/drag from under his XJ, which is evidence that it's improving aerodynamic efficieny. So better highway gas mileage is likely, IMO.

Also, this is a cheap, easy, good looking mod. My favorite kind of mod.

A cheap, easy, good looking woman will give you what? A fun time until the trouble begins and the VD symptoms show up.

The air dam is a safer choice, and I'll have fun with it. It might even save me money (on gas). When has a hot chick saved anyone money?
I signed a purchase agreement on one 24 years ago. At 10 years her mother informed me the warranty had expired. She still runs good and polishes up nice. Ill take that over MPG anytime.
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Unread 08-29-2013, 01:34 PM   #611
Newtons3
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Originally Posted by Charley3 View Post
He might, but I wouldn't know to do those things. Few people would.

It's to dangerous if not none correctly. To much hassle if done correctly.

I wouldn't want to store 50 gal gasoline. No offense intended.
I do. I have. I used to buy 100 gal of VP at a time. Then you have to store it inside, out of the heat and rain. Then you have to transfer it. 50 gal is 2 1/2 tanks for most of us and I burn a tank and a half a week. The volume Id have to transport, store, and transfer to make it through our 6 month long summers is rediculous. Possible? Yes. Ever gonna happen? No. Hell, I hate storing 100 gal during hurricanes.
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Unread 08-29-2013, 02:18 PM   #612
Charley3
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Originally Posted by Newtons3 View Post
I signed a purchase agreement on one 24 years ago. At 10 years her mother informed me the warranty had expired. She still runs good and polishes up nice. Ill take that over MPG anytime.
You've had better experiences than I have.

I didn't intend any disrespect to your wife. She sounds like a wonderful lady.

Good for you. I'm glad you're happy.
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Unread 08-29-2013, 02:29 PM   #613
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My 2000 XJ has the 4.0/AW4 with the Cali emissions (3 cats). I'm on a 2" lift and 30" tires and I get 17-17.5 city and 20-21 highway.

Only performance mods are a dynomax super turbo cat-back, 62mm bored throttle body, and an amsoil Ea drop-in air filter.
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Unread 08-29-2013, 02:32 PM   #614
Charley3
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Around here less than 100 feet is a bump, not a hill.

A hill here is from around 100 to 2500 feet. Hills are so common here the ones under 1500 feet aren't named. We have thousands of hills here. Hundreds of them are between 1000 and 2500 feet and many of those aren't even named.

We have many named mountains here from 2500 to 14,000 feet. Hundreds of them are from 2500 to 5000 ft. A few are taller than 5000 ft

There is some level land too. To the extent possible, that is where highways are built, but often hills can't be avoided. Sometimes mountains can't be avoided.
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Unread 08-29-2013, 02:40 PM   #615
Newtons3
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Originally Posted by Charley3 View Post
Around here less than 100 feet is a bump, not a hill.

A hill here is from around 100 to 2500 feet. Hills are so common here the ones under 1500 feet aren't named. We have thousands of hills here. Hundreds of them are between 1000 and 2500 feet and many of those aren't even named.

We have many named mountains here from 2500 to 14,000 feet. Hundreds of them are from 2500 to 5000 ft. A few are taller than 5000 ft

There is some level land too. To the extent possible, that is where highways are built, but often hills can't be avoided. Sometimes mountains can't be avoided.
Sorta lends perspective to my mileage claims, doesnt it? I really havent accomplished much.
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