Pentastar or 3.0l?

[Vtur]

Diesel has more power but more expensive to own. Gas has less power and cheaper. Simply as that.

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[Oil_Burner]

Then why are all dragsters not running diesel engines?

They are also not running gas either, but nitromethane (CH3NO2) and 10 percent methanol! Output HP is between 8,000 and 10,000.

The engine almost immediately hits its max torque/HP point off the line. The clutch and tires (as they change diameter due to increase in speed) work together to increase the load on the engine as it remains in the upper RPM range. The magic comes from the clutch.

 

[NachoRuby]

When we're comparing torque curves, the diesel simply has more area under the curve. It makes power longer, even if it makes less peak. A boosted gas engine would be a way to even the playing field. It'd be less peaky. But then, I'm done my with my craving for speed. Been there, done that. But it's not really apples to apples when comparing a turbodiesel vs an NA gasser v6. Of course the diesel will be quicker. When I was into fast cars,when on the dyno, it was always about making more torque longer. That made a bigger difference than making a ton of peak HP. I ran tunes that netted a quicker trap speed and 1/4 even if they made slightly less peak power.

 

[Mac]

They are also not running gas either, but nitromethane (CH3NO2) and 10 percent methanol! Output HP is between 8,000 and 10,000.

The engine almost immediately hits its max torque/HP point off the line. The clutch and tires (as they change diameter due to increase in speed) work together to increase the load on the engine as it remains in the upper RPM range. The magic comes from the clutch.

Sure, my point is diesel is not great for acceleration, I have run many different vehicles at the drag strip including my Dodge diesel, despite having around 700ft/lbs of torque it could only muster a 16.6 quarter mile.

 

[just_another_guy]

I wanted reliability and longevity, so I bought the gasser. I would consider the ecodiesel in the future after they get the issues worked out, but only if my current truck was totalled and I had to start from scratch.

 

[TwelveGaugeSage]

I would say peak torque and peak horsepower are both fairly useless in these applications. Whether you like horsepower or you like torque, what matters is the curve. A Ninja 650 has more torque at a much lower RPM than a Yamaha R6, but its no contest who wins that race. I guess the only real data that matters is actual acceleration runs.

 

[Glad_he_ate]

I would say peak tq don’t matter but in diesel land it matters a lot. I hit peak at 1400rpms and I ride that peak tq all the way through

 

[bluecollartrash]

If towing is important to you avoid the diesel

The 3.6 isn't going to out tow the 3.0. Period. The 3.6 has a slightly higher GVWR because the curb weight is less.

Put the same trailer behind both and the 3.0 will walk away from the 3.6.

 

[NachoRuby]

The 3.6 isn't going to out tow the 3.0. Period. The 3.6 has a slightly higher GVWR because the curb weight is less.

Put the same trailer behind both and the 3.0 will walk away from the 3.6.

The reason probably has a lot more to due with cooling than weight. GVWR is the total weight of the vehicle + all it can haul. The GCWR is the weight of the vehicle and all it can tow/haul at the same time. The Gvwr is only 200 lbs different, at 6450 lbs on the diesel and 6250 on the gasser. The curb weight of a JTR gasser is 5050 lbs. The curb weight of a JTRD is 5350 lbs. The difference in curb weight between the diesel and the gasser is less than the difference in GCWR. The difference in towing capacity is 1000 lbs. (6000 vs 7000). So it's something else, other than the difference in weight between the two.

The same (or similar) diesel in a ram tows much more than the gas version, so it's something else.

 

[CerOf]

The 3.6 isn't going to out tow the 3.0. Period. The 3.6 has a slightly higher GVWR because the curb weight is less.

Put the same trailer behind both and the 3.0 will walk away from the 3.6.

It’s actually more to do with the diesels cooling ability and lack thereof.

The diesel will out tow the gas, yes. But once the heat monster hits, yeah…no.

 

[OnlyOne]

Then why are all dragsters not running diesel engines?

Well to be fair they do have like 8000 ftlbs at just over idle so…..
and….nitromethane

 

[Elff]

Actually it's up to 1500lbs more [7500lbs] on certain gas engine configurations, but no matter how you build a diesel, It maxes at 6000lbs.

As such, 1000-15000lbs is more than "slightly"

Able to pull,
vs
being able to safely turn and brake and not burn up the drivetrain with max load
are 2 different things.
Someone, somewhere thought it is not safe to tow more than 6000lbs on the Diesel JT which is why it has that max rating.

That aside, Since the Gasser can be configured to tow up to 7500lbs, and people seem to think this is not an issue for a diesel

I'd like to see a side by side comparison of a gas engine with Max Tow pulling a total trailer load of 7500lbs,
vs
A diesel pulling the same 7500lbs

Over a 1hr + timeframe in an area with a lot of turns and hills.

a quick 1 mile tow or 15 minute tow, doesn't prove anything

 

[OnlyOne]

It’s actually more to do with the diesels cooling ability and lack thereof.

The diesel will out tow the gas, yes. But once the heat monster hits, yeah…no.

Hell even in limp mode it will out pull the 3.6…..

 

[2TH MVR]

Jeez. These discussions always turn out the same.

Buying the diesel does not make financial sense. For the most part ..... the diesel is potentially more of a hassle. Plenty of cons for sure.

If you are looking for a dependable daily driver ... get the gasser.
If you are looking for more fun and power..... get the diesel.

There's trade-offs in every decision in life.

I personally didn't buy the diesel because it made sense. I've owned other diesels and I absolutely love them. I like the power. Sound. And low end grunt. I could care less about range, cost of DEF, maintenance, etc.

I have a boring small gas car for commuting. The diesel Jeep is for FUN.

 

[ilovebikes99]

Actually it's up to 1500lbs more [7500lbs] on certain gas engine configurations, but no matter how you build a diesel, It maxes at 6000lbs.

As such, 1000-15000lbs is more than "slightly"

Able to pull,
vs
being able to safely turn and brake and not burn up the drivetrain with max load
are 2 different things.
Someone, somewhere thought it is not safe to tow more than 6000lbs on the Diesel JT which is why it has that max rating.

That aside, Since the Gasser can be configured to tow up to 7500lbs, and people seem to think this is not an issue for a diesel

I'd like to see a side by side comparison of a gas engine with Max Tow pulling a total trailer load of 7500lbs,
vs
A diesel pulling the same 7500lbs

Over a 1hr + timeframe in an area with a lot of turns and hills.

a quick 1 mile tow or 15 minute tow, doesn't prove anything

I understand your point but you lack information.
Jeep's front fascia isn't sufficient to support the correct spec cooling for towing in very hot temperatures at altitudes. This is why the tow rating is less.
In normal conditions for most of the country, it is sufficient. But the car cannot be certified unless all conditions are covered.

Diesels will always tow better than naturally aspirated gas engines, there is no doubt about that.
People in Europe tow boats with diesel sedans. There is no space to park a pickup truck.
The 3.6 barely tows itself because of the "aerodynamics" of the Jeep and weight.

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