Anyone getting a 2025 with the I6 Hurricane?

[HSKR R/T]

I've read a lot about rear axle ratios 3:21 vs 3:92 over the years; my 5.7 has 3.92 but I no longer tow a boat. I assume the equation has changed with the I6 turbo engines so wondering what the preferred rear axle ratios will be for either mostly highway or towing? Is everything a 3:92 or are there choices? I don't see a rear axle reference on the order sheets for the Limited but do see a 3.92 option on the Laramie. I assume the base for that is a 3:21. Any ideas on this with the new engines?

My intention for now is the Limited for several reasons but you also get the projector headlights not available on the Laramie, something I think is worthwhile at night.

Would be hard for anyone to know what the ideal gear ratio is for the Hurricanes until they release more info.

 

[Bsteiner36]

I don't have anything to judge this by but it seems like there is a lacking amount of information on the new builds the week before production starts. Is it normal to not have much information proior to production starting? I have never pre-ordered a truck before so this might all be normal.

 

[Bsteiner36]

I've read a lot about rear axle ratios 3:21 vs 3:92 over the years; my 5.7 has 3.92 but I no longer tow a boat. I assume the equation has changed with the I6 turbo engines so wondering what the preferred rear axle ratios will be for either mostly highway or towing? Is everything a 3:92 or are there choices? I don't see a rear axle reference on the order sheets for the Limited but do see a 3.92 option on the Laramie. I assume the base for that is a 3:21. Any ideas on this with the new engines?

My intention for now is the Limited for several reasons but you also get the projector headlights not available on the Laramie, something I think is worthwhile at night.

This is what I see on the standard features of the 2025 Limited. This should be what comes standard. If you want the full set of features let me know and I can DM them to you.

DMH 3.92 Rear Axle Ratio

 

[ChrisID]

I drove a I6-SO in a Wagoneer last summer (rental), and we were impressed with it, loaded with 5 guys.
So I'm guessing they've been out a little while anyway.
It pulls like the 5.7, maybe a little faster, but super quiet compared to my '21 which sounds really good 'on-the-pipe'.
Never drove it without the 5 guys, so take out 1000lbs of humans and whatever weight vs a pickup, and it is likely very competitive+ to the 5.7.
Hope they can add some sound to the thing though.

 

[lonepeak]

The I6 has been out a year or two with the Wagoneers and I've net heard of any engine issues. They seem to test pretty strong. Good to hear your experience with the SO and fully loaded. Not sure I need the HO but the only engine to come with the Limited. Not one to turn down horsepower though. I saw some figures with the HO in the Grand Wagoneer and 0-60 was in the 4s or low 5s I recall. Strong! The 5.7 was low 6s so I expect the SO to break into the 5s.

 

[Darksteel165]

I've read a lot about rear axle ratios 3:21 vs 3:92 over the years; my 5.7 has 3.92 but I no longer tow a boat. I assume the equation has changed with the I6 turbo engines so wondering what the preferred rear axle ratios will be for either mostly highway or towing? Is everything a 3:92 or are there choices? I don't see a rear axle reference on the order sheets for the Limited but do see a 3.92 option on the Laramie. I assume the base for that is a 3:21. Any ideas on this with the new engines?

My intention for now is the Limited for several reasons but you also get the projector headlights not available on the Laramie, something I think is worthwhile at night.

Limited as typical does not allow a bunch of base options, so 3.92 are forced but before it was an option you could add.
Not sure how gearing relates to the engines now since they are turbocharged and not NA.

Getting a Limited for towing is a terrible idea anyways. You will have no payload to the point gearing would not matter anyways.

In theory.
Towing wants higher gear ratios, highway for mpg wants lower gear ratios, neither are "wrong"
At lower gears 3.92 has more options, at higher speeds 3.21 has an extra gear, so 3.92 has it's RPMs and in turn fuel efficiency like you have 3.21s and locked in 7th (not 8th) gear.

 

[Darksteel165]

Limited as typical does not allow a bunch of base options, so 3.92 are forced but before it was an option you could add.
Not sure how gearing relates to the engines now since they are turbocharged and not NA.

Getting a Limited for towing is a terrible idea anyways. You will have no payload to the point gearing would not matter anyways.

In theory.
Towing wants higher gear ratios, highway for mpg wants lower gear ratios, neither are "wrong"
At lower gears 3.92 has more options, at higher speeds 3.21 has an extra gear, so 3.92 has it's RPMs and in turn fuel efficiency like you have 3.21s and locked in 7th (not 8th) gear.

I hate it when you type a reply and forget to hit submit for hours...
I even refreshed the page and didn't see any new responses until AFTER I hit post.

 

[HSKR R/T]

Limited as typical does not allow a bunch of base options, so 3.92 are forced but before it was an option you could add.
Not sure how gearing relates to the engines now since they are turbocharged and not NA.

Getting a Limited for towing is a terrible idea anyways. You will have no payload to the point gearing would not matter anyways.

In theory.
Towing wants higher gear ratios, highway for mpg wants lower gear ratios, neither are "wrong"
At lower gears 3.92 has more options, at higher speeds 3.21 has an extra gear, so 3.92 has it's RPMs and in turn fuel efficiency like you have 3.21s and locked in 7th (not 8th) gear.

I like how the 3.21 guys like to say they have an "extra gear". Every Ram had the same 8-speed. There is not "extra" gears. I mean if you want to play that card then the 3.92 has an "extra" low gear.

 

[Darksteel165]

I like how the 3.21 guys like to say they have an "extra gear". Every Ram had the same 8-speed. There is not "extra" gears. I mean if you want to play that card then the 3.92 has an "extra" low gear.

This is correct, exactly what I'm saying. All of it. Lol.
8 gears is 8 gears no matter the ratio, but driving 3.21 in 7th gear is the same as 3.92 in 8th for the highway at least when you are up to speed.
If you are towing, you are (should) not driving that fast and gain nothing from 3.21s
I don't have 3.21, or are a 3.21 guy.

 

[BowDown]

I've read a lot about rear axle ratios 3:21 vs 3:92 over the years; my 5.7 has 3.92 but I no longer tow a boat. I assume the equation has changed with the I6 turbo engines so wondering what the preferred rear axle ratios will be for either mostly highway or towing? Is everything a 3:92 or are there choices? I don't see a rear axle reference on the order sheets for the Limited but do see a 3.92 option on the Laramie. I assume the base for that is a 3:21. Any ideas on this with the new engines?

My intention for now is the Limited for several reasons but you also get the projector headlights not available on the Laramie, something I think is worthwhile at night.

Typically you don't need/want a lot of gear when you have a lot of torque which is why the TRX comes with a 3.55 gear. Unless the HO is going to be loaded down and or towing a lot, the 3.92 gear is only going to produce increased trips to discount tire.

A low ratio gear set (ex 3.92) will increase torque multiplication, something you don't need if the engine is already making a large amount of torque; a higher gear (ex 3.21) will keep you in the powerband longer utilizing the available torque. Gear is needed in the absence of power

Given that turbos build power much more abruptly than superchargers, torque will come on quick in the hurricane SO and HO so a lot of gear is going to be useless unless you're using huge tires and off road and have driving modes that adjust the TB opening scaler slowing its opening relative to the accelerator pedal.

The standard output produce 420 hp at 5,200 rpm and 468 lb-ft of torque at 3,500 rpm and the high-output 510 hp at 5,700 rpm and 500 lb-ft at 3,500 rpm.

 

[lonepeak]

Waiting to see what the choices will be on the different trim levels. Not much info so far and production on the SO 1500 begins on Monday. Too bad RAM not offering more details or a configurator page listing all the options. Certainly both the SO and HO offer more torque compared to the 5.7.

 

[Darksteel165]

Certainly both the SO and HO offer more torque compared to the 5.7.

At some RPM ranges when turbo is full bore.

 

[HSKR R/T]

Typically you don't need/want a lot of gear when you have a lot of torque which is why the TRX comes with a 3.55 gear. Unless the HO is going to be loaded down and or towing a lot, the 3.92 gear is only going to produce increased trips to discount tire.

A low ratio gear set (ex 3.92) will increase torque multiplication, something you don't need if the engine is already making a large amount of torque; a higher gear (ex 3.21) will keep you in the powerband longer utilizing the available torque. Gear is needed in the absence of power

Given that turbos build power much more abruptly than superchargers, torque will come on quick in the hurricane SO and HO so a lot of gear is going to be useless unless you're using huge tires and off road and have driving modes that adjust the TB opening scaler slowing its opening relative to the accelerator pedal.

The standard output produce 420 hp at 5,200 rpm and 468 lb-ft of torque at 3,500 rpm and the high-output 510 hp at 5,700 rpm and 500 lb-ft at 3,500 rpm.

That's assuming people are constantly driving full throttle to make the most power with the Hurricane. When only driving part throttle the taller gear will help more than be a detriment.

 

[BowDown]

That's assuming people are constantly driving full throttle to make the most power with the Hurricane. When only driving part throttle the taller gear will help more than be a detriment.

No its not, with boost, you need less RPM to achieve the same amount of torque and you can be slightly in boost under part throttle or out of boost completely and at that point, youre right back to the 3.21 vs 3.92 argument. 3.92 is less detriment to part throttle driving; I get fuel mileage, also 3.92.

It's likely, we'll see when we get a dyno graph and a brake specific fuel consumption graph, that the hurricane SO and HO are making more power everywhere vs the HEMI. The RPM at which peak TQ occurs in the Hurricane vs the 5.7 also suggests that this will be a better part throttle driving engine/truck combo. The 5.7 needs 3500-4000 rpm before it makes appreciable TQ. The Hurricane twins are already at peak TQ by 3500 RPM and that peak about 1000 rpm less than the 5.7 with ~58 and 100 lb ft more TQ at a lower RPM.

A reasonable person that understands power curves could deduce that part throttle power would be superior to the 5.7 everywhere making for a much better driving truck. More torque at part throttle requires less gear, the very reason the TRX has 3.55, the very reason hellcats have 2.62 and "performance" 3.09 gear.

 

[BowDown]

At some RPM ranges when turbo is full bore.

Unless the 5.7 is full bore, it ain't making torque either. Many of you have UC5 with performance pages, look what kind of power you're making at part throttle driving. Probably 35-50 hp and 60-70 lb ft of TQ if even that much.
You can cruise at 50 mph needing only 20HP

 

[BowDown]

I'm not beating the drum for the hurricane but I do believe that it will be a more than capable engine and likely more capable and a better driving experience than the 5.7HEMI simply do to the improved low speed part throttle torque.

 

[Bsteiner36]

I drove the grand wagoneer today from a Jeep dealer and mentioned I wanted to try out the H/O Hurricane and I don’t know anything about engine engineering but I could tell that it did drive really nice and felt way more responsive than my HEMI. I will say it didn’t make be any more excited but it does seem like as long as it has longevity it will be a great driving engine. It did really well accelerating at 50-60 up to 80. I am not sure how different the Waggoneer is calibrated but I enjoyed it.

P.S. - The Jeep guy didn’t seem happy that I said I just wanted to try out the engine and I wasn’t interested in a 110k SUV. lol.

 

[BowDown]

I drove the grand wagoneer today from a Jeep dealer and mentioned I wanted to try out the H/O Hurricane and I don’t know anything about engine engineering but I could tell that it did drive really nice and felt way more responsive than my HEMI. I will say it didn’t make be any more excited but it does seem like as long as it has longevity it will be a great driving engine. It did really well accelerating at 50-60 up to 80. I am not sure how different the Waggoneer is calibrated but I enjoyed it.

P.S. - The Jeep guy didn’t seem happy that I said I just wanted to try out the engine and I wasn’t interested in a 110k SUV. lol.

I'd bet there's some safety's in place that limit boost and max power till 500 miles so you may not have even felt everything it has

 

[HSKR R/T]

No its not, with boost, you need less RPM to achieve the same amount of torque and you can be slightly in boost under part throttle or out of boost completely and at that point, youre right back to the 3.21 vs 3.92 argument. 3.92 is less detriment to part throttle driving; I get fuel mileage, also 3.92.

It's likely, we'll see when we get a dyno graph and a brake specific fuel consumption graph, that the hurricane SO and HO are making more power everywhere vs the HEMI. The RPM at which peak TQ occurs in the Hurricane vs the 5.7 also suggests that this will be a better part throttle driving engine/truck combo. The 5.7 needs 3500-4000 rpm before it makes appreciable TQ. The Hurricane twins are already at peak TQ by 3500 RPM and that peak about 1000 rpm less than the 5.7 with ~58 and 100 lb ft more TQ at a lower RPM.

A reasonable person that understands power curves could deduce that part throttle power would be superior to the 5.7 everywhere making for a much better driving truck. More torque at part throttle requires less gear, the very reason the TRX has 3.55, the very reason hellcats have 2.62 and "performance" 3.09 gear.

A reasonable person also understands that the turbos won't be at full boost unless at full throttle or under heavy load. So normal day to day part throttle driving will be low to no boost.

 

[CalvinC]

But whether there is a lot or a little boost of an irrelevant. The ecm will dial up a specific torque target for the load and throttle position demanded. Might just require a little boost, as in a part throttle maneuver.

Difference is an NA motor requires building rpm’s to hit target, but a turbo motor might just close the wastegates some & add some fuel and BAM hit that target nearly instantaneously. That’s what makes (modern small) turbo engines feel so responsive.

(Whether that makes them “better” is subjective.)


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