So disappointed in this Diesel platform; wish there was a return policy.

[redrider]

But the engineers already went off limits with the Mojave then. What's stopping them from offering something like that on diesel models? A hood supposedly designed for more efficient cooling.

The Mojave style hood does not have a functional scoop and if made so, is facing the wrong way IMO. Do what wing designers do-tape some pieces of yarn across the hood and watch how they orient to the air flow. I would not be surprised if they went vertical near the front because you are flying a brick. That indicates a negative pressure area. Great for extraction, not intake. Do a video. I do not object to being proven wrong.

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[rpres62]

Most unproductive and dumbest comment of this thread. Are you aware that the 3.6 is in many other vehicles other than a minivan?

Yes i’m well aware of that and I have that motor in my Mojave getting 15mpg. I also have had the eco diesel in a ram 1500 and the fuel mileage and torque is way higher than the 3.6. I towed 9k with the ram 1500 no problem power wise. I wish I had gotten a diesl gladiator.

i will give you the jeep apparently has a cooling issue.

 

[TheSolarWizard]

May I ask what you’re pulling? A low profile trailer would be easier to tow than a travel trailer due to wind resistance.

2 axle box trailer with a wdh

 

[2TH MVR]

Some times we forget that the 3 liter turbo diesel is really a very small motor with relatively low horsepower. The JT is not a light vehicle. Add towing, steep inclines and hot weather .... and you maybe asking for alot from that little 3 liter.

As for the OP. Maybe you do need a different vehicle. I used to own an F350 7.3 liter power stroke diesel that was simply amazing at towing. I didn't buy the JTRD to tow with. I bought it for it's all around abilities.

 

[HighNoon]

Does your truck have the tow package. When looking for a Rubicon I almost called about a diesel until I noticed the invoice did not include a tow package. I can not understand why a dealer would not include that. I did end up with a diesel that had one but have not towed yet.

 

[ShadowsPapa]

The Mojave style hood does not have a functional scoop and if made so, is facing the wrong way IMO. Do what wing designers do-tape some pieces of yarn across the hood and watch how they orient to the air flow. I would not be surprised if they went vertical near the front because you are flying a brick. That indicates a negative pressure area. Great for extraction, not intake. Do a video. I do not object to being proven wrong.

Cowl induction works in race cars - there's a high pressure area at the base of the windshield. HVAC air is pulled in via the cowl, even with the HVAC fan not running air enters the cabin under pressure. The 71+ AMX had cowl induction hoods - pulling high pressure air from the base of the windshield area and increasing the air going into the engine intake.
I found it fun to watch rain after applying RainX on the windshield of my own Javelins and watching as the water droplets low on the windshield actually moved DOWN in some cases. About 3 or so inches up they moved up, but lower, they stayed put, slightly flattened, or moved down, proving the high pressure thinking behind the cowl induction system (and how you got air coming into the passenger area even with the fan off)

Here's a couple of quotes -
windshield facing cowl induction hoods have air pushed into them because the air density increases against the windshield

Cowl induction doesn't let air out of the engine compartment, it lets air into the engine compartment. Air hits the windshield and creates a high pressure area, forcing air under the hood.
(comment - that's ducted cowl induction - if it's wide open and not directed to the intake then it can let air pass out)

 

[CerOf]

Does your truck have the tow package. When looking for a Rubicon I almost called about a diesel until I noticed the invoice did not include a tow package. I can not understand why a dealer would not include that. I did end up with a diesel that had one but have not towed yet.

All the “tow package “ on a diesel rubicon really adds is the 2” hitch. Maybe the camera “zoom” feature.

Cooling, alternator, etc., are all the highest they have.

 

[HighNoon]

That is why it’s only $400. They don’t explain options in detail on their website.

 

[ShadowsPapa]

All the “tow package “ on a diesel rubicon really adds is the 2” hitch. Maybe the camera “zoom” feature.

Cooling, alternator, etc., are all the highest they have.

Very interesting. I can believe it, I'm not doubting, it's just that apparently they figured it needed the cooling capacity. Otherwise they'd save some money by trimming down things not needed if not towing.

Funny thing - that exact same MOPAR hitch can be bought for a fraction of 400 bucks. The EXACT SAME part, same part number, genuine MOPAR part.
The zoom I will suspect is a software feature, the hardware likely always capable?

 

[CerOf]

Very interesting. I can believe it, I'm not doubting, it's just that apparently they figured it needed the cooling capacity. Otherwise they'd save some money by trimming down things not needed if not towing.

Funny thing - that exact same MOPAR hitch can be bought for a fraction of 400 bucks. The EXACT SAME part, same part number, genuine MOPAR part.
The zoom I will suspect is a software feature, the hardware likely always capable?

Yeah, I added the hitch myself. ~$280
I have t looked in to the zoom feature.
I really don’t need it, but if it’s software, would be fun to add.

 

[Racerxray1]

What does the owners manual say about the number of miles you should put on before towing? I’ve owned (5) Ford diesels and Ford asks you put at least 500 miles on the truck before towing. My guess is that with increased mileage the engine will loosen up and he condition should get better. I’m waiting for my diesel Gladiator and have read about the issues of overheating but in most cases it sounds like the operators were pushing the truck way to hard. Also remember that momentum is your friend in a diesel. When approaching steep grade or hill, build up your speed so the engine doesn’t have to work as hard.

 

[ShadowsPapa]

What does the owners manual say about the number of miles you should put on before towing? I’ve owned (5) Ford diesels and Ford asks you put at least 500 miles on the truck before towing. My guess is that with increased mileage the engine will loosen up and he condition should get better. I’m waiting for my diesel Gladiator and have read about the issues of overheating but in most cases it sounds like the operators were pushing the truck way to hard. Also remember that momentum is your friend in a diesel. When approaching steep grade or hill, build up your speed so the engine doesn’t have to work as hard.

It's been posted here before - 500 miles.


It's fun to watch the old IRT shows and watch those drivers run the roller coaster in Alaska......

 

[MPMB]

Cowl induction works in race cars - there's a high pressure area at the base of the windshield. HVAC air is pulled in via the cowl, even with the HVAC fan not running air enters the cabin under pressure. The 71+ AMX had cowl induction hoods - pulling high pressure air from the base of the windshield area and increasing the air going into the engine intake.
I found it fun to watch rain after applying RainX on the windshield of my own Javelins and watching as the water droplets low on the windshield actually moved DOWN in some cases. About 3 or so inches up they moved up, but lower, they stayed put, slightly flattened, or moved down, proving the high pressure thinking behind the cowl induction system (and how you got air coming into the passenger area even with the fan off)

The best way I've found to visualize air movement is to think of air as a really fast liquid that doesn't separate to create "dry" pockets.

When the air hits the windshield, it's similar to when you hose off your driveway. The stream mostly goes directed in the direction of the flow, but there's some that splash back towards you. That's the air that hits a windshield and is captured by cowl induction. In race cars, you add the suction of the engine, more air will get pulled in (Venturi effect, iirc?).

I know the NASCAR trucks ran ducts from the headlights to the front of the air cleaner, a lazy man's ram air, if you will. I believe they changed it to only allow cowl induction.

Air wants to travel like water, but must maintain contact with surfaces.

 

[ShadowsPapa]

The best way I've found to visualize air movement is to think of air as a really fast liquid that doesn't separate to create "dry" pockets.

When the air hits the windshield, it's similar to when you hose off your driveway. The stream mostly goes directed in the direction of the flow, but there's some that splash back towards you. That's the air that hits a windshield and is captured by cowl induction. In race cars, you add the suction of the engine, more air will get pulled in (Venturi effect, iirc?).

I know the NASCAR trucks ran ducts from the headlights to the front of the air cleaner, a lazy man's ram air, if you will. I believe they changed it to only allow cowl induction.

Air wants to travel like water, but must maintain contact with surfaces.

And for your last sentence above, there's a word for that which I can't directly pull to mind. But there's a real word that fits that property.

A friend of mine raced an AMC Ambassador. That year/model had 4 headlights. He removed the two inner headlights and fashioned huge funnels to fit in their place and ducted them to the air filter. He said it shaved some fractions off his time. That means - it helped his HP numbers.

 

[MPMB]

And for your last sentence above, there's a word for that which I can't directly pull to mind. But there's a real word that fits that property.

A friend of mine raced an AMC Ambassador. That year/model had 4 headlights. He removed the two inner headlights and fashioned huge funnels to fit in their place and ducted them to the air filter. He said it shaved some fractions off his time. That means - it helped his HP numbers.

It's been awhile since I've delved into aerodynamics, but I think you might be thinking of laminar flow and/or boundary layers.

The headlight/ram air method definitely improves performance. I think in the NASCAR scenario, teams were developing hi-flow tunnels instead of using the basic ductwork tubing.

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