New Turbo 4 to start displacing the Pentastar

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Starting with the Jeep Grand Cherokee:


  • Stellantis unveils the all-new Hurricane 4 Turbo engine.
  • It produces 324 hp, 54 hp more than the current V6.
  • Supports hybrid, plug-in hybrid, and standard setups.
Jeep introduced the 2026 Grand Cherokee earlier today, and it ushers in an all-new turbocharged 2.0-liter four-cylinder engine. It’s more powerful and fuel-efficient than the 3.6-liter Pentastar V6, and it will eventually show up in other models.

Some interesting features, including a pre-chamber combustion design and both direct and port injection.

Another wait and see if they can make it work from a durability/longevity standpoint motor to me, but hopefully it works out.
 

MrBonez

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I wrote that poorly, I own a hemi. Not my truck towing in the CO mountains, it was TFL, video below. They say the hurricane failed because they got a low oil pressure light at the top when they stopped, but that was a software/tuning issue which Ram has already corrected as a result of this test.

That's what they said it was but I suspect there was at least a partial loss of oil viscosity due to higher engine temps and it showed once they got to the top.
An engine getting really hot will make oil pressure go down - I've had engines run waaay hot along with this pressure drop happening before.

My dad's old 67 Chevy pickup with a 230 CID straight 6 broke the fanbelt one day and it was when I saw the oil pressure gauge drop to almost nothing I realized something wasn't right.
The temp gauge wasn't working and that's how I knew it had a problem, luckily I was right at a service station with a small garage so I pulled in and that's what they found.
It simply wasn't turning the waterpump when the belt broke - They replaced it and it all went back to normal again.

Same thing in a 87 S10 I once owned that had a 350 V8 in it, that thing would peg the temp gauge in heavy stop-and-go traffic and the oil pressure gauge would go to basically nothing, only cooling down and getting some oil pressure back after I got moving again.
 

rvance

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ALL NA engines lose 3% per thousand feet elevation. It was even noticeable on my old 2500 with 6.4 and 4.10 gears.
Well I'm sure that's true, but I didn't notice anything. But I wasn't in a hurry or towing a trailer. My truck lives near sea level and it's perfect for what I use it for. All the driving we did in New Mexico and Arizona at 7K feet. It's pretty level on 1-40 all the way across but we did get some grades going to Sedona.
 

Dusty

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"That's what they said it was but I suspect there was at least a partial loss of oil viscosity due to higher engine temps and it showed once they got to the top.
An engine getting really hot will make oil pressure go down - I've had engines run waaay hot along with this pressure drop happening before."
It's been some time since I saw the video, but for a few seconds I saw a very low oil pressure displayed on the cluster (14 pounds <>). That doesn't mean that was the actual oil pressure, however, since the software changed more than just an algorithm. A false report of oil pressure could've produced the loss of power.

Regards,
Dusty
2019 Ram 1500 Billet Silver Laramie Quad Cab 2WD, 5.7 Hemi, 8HP75, 3.21 axle, 33-gallon fuel tank, 18” wheels. Build Date: 3 June 2018. Now at 141214 miles.
 

MrBonez

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Yep - It can do that if the computer is detecting a problem and that forces scaling back of power output.
What bothers me is simply changing software itself doesn't do much of anything for the actual loss of oil pressure under those conditions, provided there isn't part of the sofware itself regulating oil pressure, which I doubt any of it does.

All it does that I've ever seen from any software is to sense the amount of pressure and respond to it if it has to. If the pump is electrically driven that would be a different story but I seriously doubt anything about the pump has been changed in that way, I must think (Until proven wrong) it's still mechanically driven like always since that's proven itself reliable over time.
 

Dusty

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Yep - It can do that if the computer is detecting a problem and that forces scaling back of power output.
What bothers me is simply changing software itself doesn't do much of anything for the actual loss of oil pressure under those conditions, provided there isn't part of the sofware itself regulating oil pressure, which I doubt any of it does.

All it does that I've ever seen from any software is to sense the amount of pressure and respond to it if it has to. If the pump is electrically driven that would be a different story but I seriously doubt anything about the pump has been changed in that way, I must think (Until proven wrong) it's still mechanically driven like always since that's proven itself reliable over time.
Yeah, I think you missed my point. If the low oil pressure was falsely reported, meaning a numerical factor less than the actual oil pressure, that could explain why the engine shut down power.

I saw the software description sheet sometime later and it sounded to mean as if several operating parameters were changed in the upgrade. Maybe oil pressure reporting accuracy was one of those, I do not know. What I do know is that software upgrade was the only remedy for the issue; no hardware changes or oil specification changes.

I'd have to watch the follow up video with the Ram engineer, but wasn't it stated that pre-production testing did not uncover the problem until TFL performed the test?

Regards,
Dusty
2019 Ram 1500 Billet Silver Laramie Quad Cab 2WD, 5.7 Hemi, 8HP75, 3.21 axle, 33-gallon fuel tank, 18” wheels. Build Date: 3 June 2018. Now at 141251 miles.
 
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Docwagon1776

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Yep - It can do that if the computer is detecting a problem and that forces scaling back of power output.
What bothers me is simply changing software itself doesn't do much of anything for the actual loss of oil pressure under those conditions, provided there isn't part of the sofware itself regulating oil pressure, which I doubt any of it does.

All it does that I've ever seen from any software is to sense the amount of pressure and respond to it if it has to. If the pump is electrically driven that would be a different story but I seriously doubt anything about the pump has been changed in that way, I must think (Until proven wrong) it's still mechanically driven like always since that's proven itself reliable over time.

Software does control oil pressure in a lot of engines, including the new Hurricane. Variable displacement oil pumps are getting more and more common, and while they are mechanically driven they have an electric solenoid that alters the flow and pressure. It manipulates the geometry of the pump to alter volume and pressure.
 

MrBonez

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Software does control oil pressure in a lot of engines, including the new Hurricane. Variable displacement oil pumps are getting more and more common, and while they are mechanically driven they have an electric solenoid that alters the flow and pressure. It manipulates the geometry of the pump to alter volume and pressure.

Never knew those existed in engines in the first place but good to know and learn about so I'll call it a good thing.
I'd rather be taught/corrected when wrong than to keep on while being ignorant.
 

Randy Grant

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What high rpms? I have a 24 gm turbo 4 and it knocks the socks off my 4.7 and 5.7 while towing.

My rams would spin up to 5k-6k rpms while dropping down to 50mph to pull a 4k lb camper up hills.

The gm turbo 4 spins all the way up to 3500rpm while holding 72mph pulling the same camper up the same hills.

That turbo 4 is a gasoline operated diesel engine! It did have hardware updates in 22 so I would not buy before that date.

The rams though cannot keep up. Especially because both had lifter failure at 70k miles with 3k mile oci.

When not towing the rams might be peppier. But put a load behind them and the rams get their asses handed to them by the Chevy.
What are you towing? I towed 7k with a 1988 Jeep Comanche 4L
 

Hagar1

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Bear in mind the following is just my personal take on it:

If they were to start making smaller pickups again and used them in those, this woudn't be such a bad thing but everyone knows gasoline turbo engines don't like being under a sustained heavy load/strain for too long.
This same basic effect applies to all turbo engines, gas or diesel:
More air & fuel burned means more power and heat generated.
Or in other words:
The bigger the fire, the more heat you get.

Think for a sec - If you blow on a fire, it gets hotter such as a blacksmith using bellows for their forge or the way a torch uses oxygen (Pure Oxygen) so it gets hot enough to do it's work.
In the case of a turbo'ed engine, the extra air by volume makes it have to use more fuel to "Correct" the air/fuel mix or it's runs into a "Running lean" condition, and anytime you add fuel to the engine with extra air too it simply runs hotter due to the extra amount of air/fuel being burned in the first place.

It's a tradeoff of more power (Good) to use with more heat (Bad) to deal with.

In this case turbo's are the new "Thing" to attract buyers with smaller, cheaper engines that also have more power.
I mean available power in a vehicle drives sales and makes dealers happy too - We all know it.

In a weird way it's kinda like we're back in the 60's again except these engines probrably won't last as long and you can't "Do this or that" to them overnight or over the weekend either - And if you have a job at your local fast food joint, you can't afford it anyway like you could back then.

As for my own personal experience with turbo engines:
had one in a 72 Pinto body that was a factory 2.3 turbo engine with a 4-speed out of a 79 Mustang Turbo car and yes, it was strong....
And also showed me how tempermental a gas turbo engine can be.

Even though the body had been lightened it still didn't like being ran too hard too many times before a cool-down period was required before I went again.
I had even stuffed a V8 radiator in the car and while that helped, it didn't fully offset just how hot it could get while doing it's thing (Running hard/Doing burnouts on the line... That kind of thing) but it did cool down faster once it wasn't being pushed than it did before I popped that in.

If it got too hot, it lost power and if it ever stalled out on me it was hard to restart too.

Gas engines are not diesels that just LOVE the heat - Everyone knows the hotter a diesel can run, the happier it gets:driver:but that's not the case for a gas burner.

With the Hurricane being what it is, used the way it's been designated to and now this.... I can't really see myself buying a new truck from the Ram lineup except for a Hemi powered one and even then, that's really a No-Go with Etorque in play.
And no, the others aren't faring any better themselves right now.

I'm saying it now:
These trucks may do well when new/newer (And they should within this timeframe - 7 years maybe?) but I believe after a while things will begin showing us the flip-side to it all and to me, it doesn't look like anything I'd want to have OR deal with.... Including paying for it when that time comes.
The auto manufacturing business is essentially a "parts" business, some parts travel to the consumer in close formation on 4 wheels, other parts come in little plastic bags or cardboard boxes.
The manufacturer doesn't want vehicles to last forever, a few years past warranty for them, would be great.
Fortunately, there are some good after market suppliers still around.
 

MrBonez

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The auto manufacturing business is essentially a "parts" business, some parts travel to the consumer in close formation on 4 wheels, other parts come in little plastic bags or cardboard boxes.
The manufacturer doesn't want vehicles to last forever, a few years past warranty for them, would be great.
Fortunately, there are some good after market suppliers still around.

Yes, I'm well aware of it.
I used to go and do maintenance work for several auto maker suppliers on their mobile equipment.
One place did castings and made aluminum intake manifolds for Chrysler engines, another made seats for certain Mercedes models and yet another supplied wiring harnesses for Hyundai cars.... Even was the guy that serviced mobile equipment in a Dana truck/trailer axle operation for awhile.

And that's not all, I really can't recall what or where all I've been before doing this kind of work.

So - I'm well aware indeed. ;)
 

Hagar1

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Yes, I'm well aware of it.
I used to go and do maintenance work for several auto maker suppliers on their mobile equipment.
One place did castings and made aluminum intake manifolds for Chrysler engines, another made seats for certain Mercedes models and yet another supplied wiring harnesses for Hyundai cars.... Even was the guy that serviced mobile equipment in a Dana truck/trailer axle operation for awhile.

And that's not all, I really can't recall what or where all I've been before doing this kind of work.

So - I'm well aware indeed. ;)
Yup! That is the way alright but there are a surprisingly large number of people that don't realize that.:cool:
In some circles it is called, "planned obsolescence. "
 

Ritchie_Rich

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Starting with the Jeep Grand Cherokee:


  • Stellantis unveils the all-new Hurricane 4 Turbo engine.
  • It produces 324 hp, 54 hp more than the current V6.
  • Supports hybrid, plug-in hybrid, and standard setups.
Jeep introduced the 2026 Grand Cherokee earlier today, and it ushers in an all-new turbocharged 2.0-liter four-cylinder engine. It’s more powerful and fuel-efficient than the 3.6-liter Pentastar V6, and it will eventually show up in other models.

Some interesting features, including a pre-chamber combustion design and both direct and port injection.

Another wait and see if they can make it work from a durability/longevity standpoint motor to me, but hopefully it works out.
Hmm. The Pentastar in my wife’s Durango is rated at 290hp. When was it derated?
 
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Docwagon1776

Docwagon1776

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Hmm. The Pentastar in my wife’s Durango is rated at 290hp. When was it derated?

It's tuned differently in different applications and with different intake/exhausts. The 200 was 295hp. Chargers were 292 or 300hp, depending on trim. I don't know about the Durango. You'd have to look at individual years, models, and trims to see what changed when in a given lineup.
 

jmc921

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No. Just, no. Stellantis can't be trusted to make a turbo 4. It'll take 342 revisions to get to where a single unit will achieve 50K miles without a major component failure.
They already have a turbo four 2.0 liter that’s been in a number of different Jeep Wranglers and likely other vehicles around the world. So maybe it won’t be all that new.
 

tjfdesmo

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They already have a turbo four 2.0 liter that’s been in a number of different Jeep Wranglers and likely other vehicles around the world. So maybe it won’t be all that new.
There is very little carryover from the Hurricane 4 to the Evo.
 

jmc921

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There is very little carryover from the Hurricane 4 to the Evo.
Good to know. We’ll just have to wait and see what the new engine is, along with what it was derived from. Or maybe it will be all new in which case a lot of the earlier comments are valid. Thanks for the info.
 

Marine Les

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Pentastar has power at higher rpm. I have a Gladiator 3.6 and run 6% grades at 65mph pulling a 4k trailer and a gross weight of 10k. It runs in 3rd gear pulling 5500 rpm with about 3/4 throttle going up. The 3.6 is a short stroke motor and does not seem to be straining to do this. The 8spd ZF makes the little motor sing.
 
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