[Rivi]

well the design allows full cold flow at low manifold vacuum,its very simple.I have no idea why jeep doesn't use it,i'm guessing they are owned by the oil companies.There could be no other reason,the gm cars get easy 1-3 with it.Disconnect it on any of them and watch the mileage drop along with throttle response.GM cars use it all the time even in summer weather,like i said at low vacuum it opens full cold.Its so simple to setup its redicules.Setup involves 1 hose,a valve and a vacuum operated temp control valve.Any junk yard has about 50 million of these setups under the hoods.GO GET ONE if you want some free mileage!

[Rivi]

p.s. all you BS posters owe me an apology,why is it that people jump on anything they don't understand?

[Rivi]

the mileage increases because you are using more of the energy the engine wastes,you also need less fuel to make the same amount of heat in the cylinders.By the way the other gas saver is the EGR valve.Ever wonder why a Covette can get 25-30 mpg with 300+ hp you only get 15-20 with half that?ITS CALLED

EFFICIENCY


watch this fallout!

[Red_]

I've been wondering how big of a ***** it would be to fit an EGR system on a TJ

[Rivi]

its always puzzled me why jeeps are so far behind the curve,my brandnew 84 cj-7 had a electric intake heater grid.I just thought geez what a complete waste of money when they could have used free exhaust heat<thats being tissed away anyway>to heat the manifold.Crazy stuff,honestly when i bought this 97 for my wife i was shocked how far behind it is compared to any other 97 vehicle in modern design features.In 97 25mpg highway is easily within any vehicles design,but even 07 wrangler still can't get that.I think its complete contempt on jeeps part.TRUST ME ON THIS



BIG OIL OWNS JEEP!

[Fox Fader]

Originally Posted by Rivi

the mileage increases because you are using more of the energy the engine wastes,you also need less fuel to make the same amount of heat in the cylinders.By the way the other gas saver is the EGR valve.Ever wonder why a Covette can get 25-30 mpg with 300+ hp you only get 15-20 with half that?ITS CALLED

EFFICIENCY


watch this fallout!

Whoa, hold on, that's got a lot to do with areodynamics and weight not just EGR and the such.

300 hp or not, you can have 500hp and with proper fuel managment you can still get great mileage. Or, you can have 160 hp with poor managment and get poor mileage in the same car.

What I'm saying is, I agree with the warm air deal you posted, but I don't think the comparison between the worst areo'd vehicle and one of the best is the best way to partly prove your fact.

Troy

[Rivi]

Originally Posted by Fox Fader

Whoa, hold on, that's got a lot to do with areodynamics and weight not just EGR and the such.

300 hp or not, you can have 500hp and with proper fuel managment you can still get great mileage. Or, you can have 160 hp with poor managment and get poor mileage in the same car.

What I'm saying is, I agree with the warm air deal you posted, but I don't think the comparison between the worst areo'd vehicle and one of the best is the best way to partly prove your fact.

Troy

i agree completely

[bluehdmc]

Originally Posted by Rivi

well the design allows full cold flow at low manifold vacuum,its very simple.I have no idea why jeep doesn't use it,i'm guessing they are owned by the oil companies.There could be no other reason,the gm cars get easy 1-3 with it.Disconnect it on any of them and watch the mileage drop along with throttle response.GM cars use it all the time even in summer weather,like i said at low vacuum it opens full cold.Its so simple to setup its redicules.Setup involves 1 hose,a valve and a vacuum operated temp control valve.Any junk yard has about 50 million of these setups under the hoods.GO GET ONE if you want some free mileage!

I don't believe DC is owned by oil companies and there probably is a reason Jeep's engineers don't use this kind of technology.And I'm sure if you talked to a Jeep engineer he'd spend about 4hrs explaining it to you and I probably wouldn't understand much of it myself. All US automakers are subject to CAFE (Corporate Average Fuel Economy) ratings. If they could get their average up on a Jeep they'd be quite happy because then they could sell more big cars instead of having to push neons etc. A Jeep has the aerodynamics of a brick, I didn't buy mine for mileage and when gas hits $3 a gallon in NJ, I'm hurting. I sloowwed down myself, use sythetic motor oil, try all the other tricks to stretch my mileage, and when I go to the pump, suck it up!

[Rivi]

like i said we average 19-23 with the hot air setup,try it you'll like it.I'm not sure why you spend extra on oil everytime but not do a simple cheap mod to the air intake once??????

by the way the local jeep dealers shop foreman didn't believe me that we were getting 19-23 and refused to discuss it.I thought to myself ok be a dumbazz.

[Rivi]

Originally Posted by bluehdmc

I don't believe DC is owned by oil companies and there probably is a reason Jeep's engineers don't use this kind of technology.And I'm sure if you talked to a Jeep engineer he'd spend about 4hrs explaining it to you and I probably wouldn't understand much of it myself. All US automakers are subject to CAFE (Corporate Average Fuel Economy) ratings. If they could get their average up on a Jeep they'd be quite happy because then they could sell more big cars instead of having to push neons etc. A Jeep has the aerodynamics of a brick, I didn't buy mine for mileage and when gas hits $3 a gallon in NJ, I'm hurting. I sloowwed down myself, use sythetic motor oil, try all the other tricks to stretch my mileage, and when I go to the pump, suck it up!

yeah he would probably spend 4hrs tryin to bs me!!!! because i know this with a few other mods can boost mileage to acceptable standards.

[Red_]

CAFE standards for LTs at the time were only 20.7 MPG. LTs cover trucks, SUVs and Minivans. DC did meet their LT requirement but fail on the side of passenger cars. While the 4.0 was in production there was no incentive to improve the FE. Wranglers are a niche vehicle. They sell well but they aren't a bread and butter vehicle. So all that has been done is to improve emissions, hence the crappy flowing head on the later 4.0s, revised injection programming and the redesign of the EVAP system on 05-06 TJs

IF DC was interested in FE we could have had things like a cross flow head, EGR system, dual feed intakes at least.

[amp77]

Originally Posted by thesherm

i also suspected that i was losing mpg, so i calculated the mpg of my tj while idling.... get ready for my conclusion....


0 mpg

You clearly spent more on your education!!

Just to make you all feel better, my truck gets 8mpg, and the Cobra I sold before I bought the Jeep got around 6-7 and could only take 93 Octane. The mileage on the Jeep (even with 35's) is the best I've had in a long time!

[Rivi]

i'm happy with mine,but like i said its 19-23 range always

[Tim70]

Originally Posted by Rivi

i'm happy with mine,but like i said its 19-23 range always

Then post the mod, and how to wire it up.

I'm more than willing to give it a shot.

[Rivi]

couple of ways to do it,if you go to any u pull it type junk yard and look for any gm car from 80-92 you will see the system i'm talking about.I use a different system i came up with myself thats alot more basic.I use the stock air cleaner inlet horn turned in towards the upper rad hose with a rubber boot that fits around the upper rad hose.All the intake air must pass over the upper rad hose to get into the air box.It works great,but if you want the full function where the hot air drops out at WOT you must use the gm setup with the vacuum operated hot air valve.I'll take some pics next nice day,its 22 here dark and too cold to go out and fool around.If you use the system without the valve like i do its still very quick and peppy.Basiclly all you need to do is move the air inlet towards a heat source but not too hot.The upper rad works nice,you want to get that inlet air up around 100 f or so.I also use the hot air from the rad fan,the way i have the rubber boot set the air from the the fan washes over the upper rad hose and into the air cleaner intake. DON"T GO OVERBOARD! if you get it too hot the engine may ping.The rubber boot just goes over the end of the air horn.Be sure that what ever you use is flame proof and can't fall into the moving fan.USE CAUTION<this is why i really didn't want to post this info here>some nut will hook up a propane torch to heat the air,burn up his jeep and blame me.DO THIS AT YOUR OWN RISK!