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Old 08-09-2010, 03:14 PM   #1
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Pentastar-When's the JKU gonna get it?

I'm a new member here. I don't own a Jeep but will soon. I own a 4runner and have done all of my offroading in it. While debating the amount of mods that I was going to do to it, I thought "Why not just buy a capable vehicle from the get go instead of serious modding (solid axle swap, front/rear elockers, lift, diff drop, etc?)" This is what made me decide to get a JKU Rubicon.

I don't absolutely need a JKU right now, but I want one ASAP.

So, I know that the 2011 isn't going to get the Pentastar, but is the 2012 going to get it? If it is, I'm more than willing to wait a year for the Pentastar. If it's not, I might just get a new 2010 now.

ETA-Also, does anyone know if any Jeeps are getting a new auto tranny? I've always been a standard guy but might cross over to an auto if it was more than a four speed.

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Old 08-09-2010, 03:23 PM   #2
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if i were you i would buy a used rubicon now and the money you saved from not buy a new one off the lot you can modify to your liking... more money for lift and/or a RUBICRAWLER if you buy an auto, and tires... unless you find a rubicon with lift and tires already done and you get a discounted price

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Old 08-09-2010, 03:31 PM   #3
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if i were you i would buy a used rubicon now and the money you saved from not buy a new one off the lot you can modify to your liking... more money for lift and/or a RUBICRAWLER if you buy an auto, and tires... unless you find a rubicon with lift and tires already done and you get a discounted price
I've look at used Rubi's....And I thought Toyota's maintained resale value!

The used JKU's with less than 35k miles are overpriced in my opinion. It's worth more to me to pay $5-$8k more and get brand new JKU with a warranty.
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Old 08-09-2010, 03:37 PM   #4
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Wait for the 290hp Wrangler!
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Old 08-09-2010, 03:37 PM   #5
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There's no telling the Pentastar will be better.
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Old 08-09-2010, 03:52 PM   #6
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There's no telling the Pentastar will be better.
True.

Though, on paper it is vastly superior to the dog that's in the JK now.

There's no telling that it won't be infinitely better, either.

I'm going to be very interested to see how the Pentastar does in the 2011 Grand Cherokee.
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Old 08-09-2010, 04:25 PM   #7
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Pentastar will be in all 2012 Wranglers. I think 290 hp and 260 torque makes the Pentastar better. and if you consider the flex fuel capabilities and the fact that the Pentastar is already being tested with a single and dual turbo. As far as the Pentastar in the new Grands, let's just say awesome. go drive one before you pass judgement. The 5 speed auto has a little lag, but once it kicks in it goes.
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Old 08-09-2010, 04:31 PM   #8
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Pentastar will be in all 2012 Wranglers. I think 290 hp and 260 torque makes the Pentastar better. and if you consider the flex fuel capabilities and the fact that the Pentastar is already being tested with a single and dual turbo. As far as the Pentastar in the new Grands, let's just say awesome. go drive one before you pass judgement. The 5 speed auto has a little lag, but once it kicks in it goes.
Thanks. This is the info I was looking for.

Is the 2012 wrangler going to get a 5 speed auto tranny?
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Old 08-09-2010, 04:31 PM   #9
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drove a 2011 grand with it.. nothing to write home about.. felt like a 4.0L. Oh wait that would be better....
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Old 08-09-2010, 05:08 PM   #10
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Not sure what tranny since they are building all new ones. I would guess the 5 speed, but a lot of the 2012 Chrysler Jeep Dodge products are going to 6 thru 8 speed trans. % speed would be great. And maybe with Fiats air induction (multi air) the Pentastar will get more power.
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Old 08-09-2010, 07:04 PM   #11
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Thanks. This is the info I was looking for.

Is the 2012 wrangler going to get a 5 speed auto tranny?
Uh, none of that is a fact. I would say a good possibilty, but no where near a fact at this point. All of the HP and torgue is at a higher RPM band. You can't drive the GC and compare to what it will be like in the JK. Most people who don't like the 3.8 have a 4 dr and an auto trans. It's fine with manual. I think a different auto trans will be as much an improvement as the 3.6 itself. Put the 3.6 in with the same trans and I think everyone would still be dogging the 3.6.
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Old 08-09-2010, 08:22 PM   #12
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Of course they would dog the 3.6 with a 4 speed. That's why a 5 speed is a pretty good bet being that it's a pretty tough trans. I left the possibility of more than a 5 speed due to how the Wranglers are changing. Heated seats, power options, soft touch trim, etc. Look at the Hummer and where it began. If Jeep isn't careful they are going to price themselves out of most people budget. Who needs to spend $40k on a Wrangler?
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Old 08-09-2010, 08:50 PM   #13
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Old 08-09-2010, 09:00 PM   #14
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Of course they would dog the 3.6 with a 4 speed. That's why a 5 speed is a pretty good bet being that it's a pretty tough trans. I left the possibility of more than a 5 speed due to how the Wranglers are changing. Heated seats, power options, soft touch trim, etc. Look at the Hummer and where it began. If Jeep isn't careful they are going to price themselves out of most people budget. Who needs to spend $40k on a Wrangler?
You're missing my point. The 3.8 may in fact be the better choice with a better trans. We'll never know for sure.
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Old 08-10-2010, 08:59 AM   #15
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Daggo66, got ya, I sell them and have never been a fan of the 3.8 due to the low hp and torque. My biggest worry though has always been the oil consumption problem. That's why I am waiting for the 3.6 before doing any real mods.
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Old 08-10-2010, 09:08 AM   #16
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What have you seen regarding oil consumption? I've heard a couple reports on the forums. I have had zero issue with oil consumption.
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Old 08-10-2010, 09:39 AM   #17
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No oil consumption here either. I use Mobil 1.
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Old 08-10-2010, 10:06 AM   #18
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Uh, none of that is a fact. I would say a good possibilty, but no where near a fact at this point. All of the HP and torgue is at a higher RPM band. You can't drive the GC and compare to what it will be like in the JK. Most people who don't like the 3.8 have a 4 dr and an auto trans. It's fine with manual. I think a different auto trans will be as much an improvement as the 3.6 itself. Put the 3.6 in with the same trans and I think everyone would still be dogging the 3.6.

"90% of torque is available from 1,600 to 6,400, so it's not a “peaky” or “paper horsepower” engine."


I'm also liking the fact that it can drink e-85. I'm waiting.
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Old 08-10-2010, 10:13 AM   #19
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The 3.8L V6 is a good engine and has been for decades !!

Dag is right, you could put a 426 Chrysler "HEMI" in front of the present JK Auto (42rle) and it still would not perform !!

The best thing Chrysler could do, is replace the auto with a new 5 spd auto-improve the auto cooling sys and keep the 3.8L !!

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Old 08-10-2010, 10:24 AM   #20
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The 3.8L V6 is a good engine and has been for decades !!

Dag is right, you could put a 426 Chrysler "HEMI" in front of the present JK Auto (42rle) and it still would not perform !!

The best thing Chrysler could do, is replace the auto with a new 5 spd auto-improve the auto cooling sys and keep the 3.8L !!

JIMBO
I agree with many of his points about the current automatic transmission. I don't own one so I can't extensively comment firsthand, but I do have a good working knowledge of automotive powertrain systems and have driven a friend's JK auto.

The 4-speed automatic tranny seems to be a large contributor to the lack of performance in the 3.8, however the engine's powerband is also a contributor. The 3.8 doesn't seem to start developing any torque until about 2500 RPM and seems to completely lose its enthusiasm around 3100.

That's not a very wide range of usable torque.
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Old 08-10-2010, 10:34 AM   #21
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I own one and if you could manually start from 1st (L) and go thru 5 more (auto) gears--you could drag race the JKU

The 4sp auto it has now is designed for 45 mph travel in 20° weather-engines fine, it's the transmission of its torque to the wheels that bad !

The standard transmission guys don't have any REAL complaints about the 3.8L !!

Update the tranny-forget the engine !

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Old 08-10-2010, 10:41 AM   #22
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I own one and if you could manually start from 1st (L) and go thru 5 more (auto) gears--you could drag race the JKU

The 4sp auto it has now is designed for 45 mph travel in 20° weather-engines fine, it's the transmission of its torque to the wheels that bad !

The standard transmission guys don't have any REAL complaints about the 3.8L !!

Update the tranny-forget the engine !

JIMBO
I understand what you're saying.

I think that we are talking about it's performance under different scenarios, though....Mainly a daily driver/city scenario vs. off road. I'm not going to drive my JKU as a DD. The only highway use it's going to see is on the way to the trail. However, I think the extra HP will show added improvement on the highway going up mountain passes; even with a 6 speed.

Serious off road conditions better utilize available torque at off idle. Part of the appeal of this new Pentastar engine, for me, is the wider range of torque that starts being available at lower RPM's.
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Old 08-10-2010, 10:47 AM   #23
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The oil consumption issue is more of a problem now. the 3.8 has been around since 1989 and was a great engine. the original 3.8 was built to use 5w30 oil. chrysler went to a low tension rings to increase fuel economy and and oil went to 5w20. Lower tension rings means they can get stuck easier. If you have carbon build up due to lack of maintenance you get oil consumption issues. Best thing is definitely synthetic, but change it every 3-4000 miles. The other thing to make sure of is the PCV (crank case vetilation) is working properly.

Just my opinion, but technology changes and a new motor with more power and definitely a new auto trans would make any JK better. I do miss the 4.0 though.
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Old 08-10-2010, 10:50 AM   #24
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Yea, I understand and my JKU is also not a DD and I drive almost SOLELY off-road

It's a JKU Rubi and with the Rubi xfer case, I can climb trees at idle, in 4lo--

Years ago I had several modified Dodge Ramchargers (440), with autos and this JKU is quicker off the line, (4lo) than the 440's were and!!

Putting the tranny cooling coils, in the JK, at the bottom of the A/c condenser is STUPID !!

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Old 08-10-2010, 10:55 AM   #25
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Yea, I understand and my JKU is also not a DD and I drive almost SOLELY off-road

It's a JKU Rubi and with the Rubi xfer case, I can climb trees at idle, in 4lo--

Years ago I had several modified Dodge Ramchargers (440), with autos and this JKU is quicker off the line, (4lo) than the 440's were and!!

Putting the tranny cooling coils, in the JK, at the bottom of the A/c condenser is STUPID !!

JIMBO
That's some good perspective. Thanks.

Why don't you like the idea of an external tranny cooler on the ac condenser on the JK auto?
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Old 08-10-2010, 11:05 AM   #26
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the 3.8 is a good engine. it's basically the 4.0, evolved for better emissions and fuel economy. the real life stats on it are nearly identical.

there's 2 issues involving this "JK's suck with power" thing. the first is the JK itself. face it. it's big, and it's heavy. the 3.8, is a little small for it. the 4.0 would feel the exact same way in a JK. TJ's and YJ's are smaller, with an engine that is great for it's size. enter the Pentastar. it's a 3.6, flex-fuel engine. smaller. better MPG. just like the 4.0 vs. 3.8 debate, the 3.8 looks better. in real life, the same. now everyone wants a smaller, flex-fuel engine in the JK. Jeep's current trend is street friendly, better MPG, luxury style additions, not power, better off-road, or speed additions. that being said, this engine isn't being added to increase power. it's there for better MPG and better emissions IMO. I hope in wrong, but I don't see Jeep using an engine to increase power. it's much cheaper to put 4.10's the the Sports again, or 4.88's stock.

issue 2, the 42RLE. once again, it sucks because of fuel efficiency. it's in 3rd by 30mph for crying out loud. OD a shade over 40. come on now. this is programmed to maximize fuel efficiency. what you gain in fuel efficiency, you lose in power.

my solution? don't wait for that Pentastar. I manipulated and altered my auto's shift pattern with a chip. this shift schedule can be manipulated very well, staying in 2nd longer, delayed OD upshifts, and generally increased throttle response time.your mpg WILL drop. but with a gasoline combustion engine, that's what you get. it's one or the other. pick one.

the power is there. it's the transmission of power through an auto geared for fuel economy, and too tall stock gears in the axles. changing the REAL problem is cheaper than just dropping in another engine and buying a brand new jeep.
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Old 08-10-2010, 11:08 AM   #27
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Well, it's coils are physically LITTLE !!


Quote:
Originally Posted by domstriker View Post
That's some good perspective. Thanks.

Why don't you like the idea of an external tranny cooler on the ac condenser on the JK auto?
It's not at the bottom of the radiator where it can be INFLUENCED by COOLED water, after the radiators cooling effects

It's at the bottom of the A/C condenser--IN FRONT of the radiator, of course it's influenced by passing air (not much) and when you turn the A/C on--

Even though the engine fan comes on automatically, the condenser heats up, so the cooling effects, for the tranny, are LOST

This is one of the reasons JEEP has a recall (J30), to let the driver know WHEN THE TRANNY GETS TOO HOT--

If you don't immediately pull over and cool the tranny-it will go into "LIMP' mode and your diddled by the dynamic dong of destiny !!

No thanks-I've modified mine so-this situation doesn't affect me !!

We win some, We lose some--I'm ahead !

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Old 08-10-2010, 09:42 PM   #28
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The oil consumption issue is more of a problem now. the 3.8 has been around since 1989 and was a great engine. the original 3.8 was built to use 5w30 oil. chrysler went to a low tension rings to increase fuel economy and and oil went to 5w20. Lower tension rings means they can get stuck easier. If you have carbon build up due to lack of maintenance you get oil consumption issues. Best thing is definitely synthetic, but change it every 3-4000 miles. The other thing to make sure of is the PCV (crank case vetilation) is working properly.

Just my opinion, but technology changes and a new motor with more power and definitely a new auto trans would make any JK better. I do miss the 4.0 though.
I've never heard any of this before...

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