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Topic Review (Newest First)
04-29-2010 10:35 PM
DodgeM37 The new 3.6 is on the way, probably will make us 3.8 owners sick....wonder if it will be a easy swap?
04-29-2010 03:05 PM
rpadgett2 Mine is a 2010 2-door with 35" tires and 3:73 gears.

My only issue is when the wind blows or you go over an overpass. It kicks out of OD and you just about have to floor it to keep going. I didn't buy the jeep for speed, I have other cars for that.
04-28-2010 09:02 PM
JIMBOX Heh Heh, OOOOPs, well you are quite a bit younger than me


Quote:
Originally Posted by willywaxer View Post
Thanks Jimbox. At 50, it's nice to be referred to as "young" . My first Jeep was in 1977, when I used it to plow driveways to make money. Since then I've owned 7 of them. Also have owned an FJ and a LR SIIa. But I guess this Noob just expected too much.
Now maybe you shoulda done some more homework before buying that JK, I hear the FJ's and LR's are OK with power, but missing other stuff, hell it's 6 of one and half dozen the other !!

JIMBO
04-28-2010 08:51 PM
willywaxer Thanks Jimbox. At 50, it's nice to be referred to as "young" . My first Jeep was in 1977, when I used it to plow driveways to make money. Since then I've owned 7 of them. Also have owned an FJ and a LR SIIa. But I guess this Noob just expected too much.
04-28-2010 04:14 PM
Cal I don't see a problem with the 3.8 and power. And I've got the '10 JKU gets up and goes just fine. It's one "H" off alot better than the '00 4cyl 5 spd I traded in.
04-28-2010 10:02 AM
JIMBOX Thats too bad, but you're probably young and didn't know what to expect!!


Quote:
Originally Posted by willywaxer View Post
I have a 4dr auto 2010 Rubi with 34" tires and it's a dog. Forget about towing even a small camper. Some of this may have to do with the fact there's little air where I live up at 8900 ft, but the computer should be compensating for this. Then again, it's only a couple weeks old, so maybe it will get better. I would love to boost the HP 10-15%. I've read exhaust and filters do next to nothing with this vehicle. I've had little luck with chips (on other vehicles) as well. Any ideas?
When I moved my '08 Rubi/trailer to NorNv (4200)ft, the ECM did a LITTLE recal, as I could feel a little more performance, pulling my trailer-up to 8000 ft, but I knew what to expect when I bought the JK and I have had more performance vehicles that you'll ever know

You must have the 4.11 gears (Rubi) so try to set up your vehicle starting procedure: to check fuel/doors close/coast clear front/back/seatbelts on/ign on/---OD OFF--OD OFF--OD OFF

No problemo and your ECM will adj slowly, but not much--live with it or sell it and buy an FJ 40

JIMBO
04-28-2010 09:48 AM
willywaxer I have a 4dr auto 2010 Rubi with 34" tires and it's a dog. Forget about towing even a small camper. Some of this may have to do with the fact there's little air where I live up at 8900 ft, but the computer should be compensating for this. Then again, it's only a couple weeks old, so maybe it will get better. I would love to boost the HP 10-15%. I've read exhaust and filters do next to nothing with this vehicle. I've had little luck with chips (on other vehicles) as well. Any ideas?
04-28-2010 09:06 AM
JIMBOX --------------BINGO-------------------


Quote:
Originally Posted by jake_blue View Post
I think with the abundance of upgrade options there's probably enough untapped power in the 3.8L to satisfy any Jeep owner with realistic expectations. As has been said repeatedly, "It's a Jeep and not a sports car" so there has to be some reality in balancing the expectations of it's on-road performance versus off-road. There are threads that discuss upgrade chips for response and fuel efficiency as well as superchargers for power. So it seems to me that while the stock 3.8L may be a little on the puny side for a 4-door Jeep to outpace a sedan on the highway it doesn't seem like it's lacking for headroom to boost that perform while still retaining it's off-road capabilities without risk of overpowering the driveline components. That's been my perception as I've read through this and other forums and has aided in determining my own upgrade intentions.
---WOW, thanx Jake

JIMBO
04-28-2010 08:55 AM
jake_blue I think with the abundance of upgrade options there's probably enough untapped power in the 3.8L to satisfy any Jeep owner with realistic expectations. As has been said repeatedly, "It's a Jeep and not a sports car" so there has to be some reality in balancing the expectations of it's on-road performance versus off-road. There are threads that discuss upgrade chips for response and fuel efficiency as well as superchargers for power. So it seems to me that while the stock 3.8L may be a little on the puny side for a 4-door Jeep to outpace a sedan on the highway it doesn't seem like it's lacking for headroom to boost that perform while still retaining it's off-road capabilities without risk of overpowering the driveline components. That's been my perception as I've read through this and other forums and has aided in determining my own upgrade intentions.
04-25-2010 09:46 PM
rmac I have an '07 X 2dr w/ hardtop and auto trans and no complaints here! I have 66,000 miles on it!
04-25-2010 09:37 PM
nick50471 You bought a Jeep. If you don't think it has enough power drop a SB Chevy in it. I'm sure it won't take Novak long to come up with a conversion kit.
04-25-2010 09:05 PM
jaeger24
my thoughts on 3.8

Quote:
Originally Posted by guygettnby View Post
for all the people who have agreed to this thread and think the 3.8l is plenty of power... how many of you have a 2dr and how many have a 4dr.


I have an 08 2dr 6 speed, I think it needs more torque in the lower rpm range to take off a little better, or I just need better gears. It cruises ok on the highway, but 6th gear sucks anytime i climb a slight grade or the wind hits it then its time to downshift!!! I get around 15/20 mpg.
04-25-2010 08:32 PM
fauxsuper What I've found is that in my particular case, a 2 door with stock tires, gearing and a soft top, this 3.8 works fine. The performance is similar to my 93 Cherokee with the 4.0, but the engine is a LOT more refined. I'm more impressed with it that I thought I'd be. And it seems to work well at lower RPM on the trails. I'm still new to it and I occasionally find myself on the freeway going 65 and still in fourth, since it makes so little vibration and noise. True, there seems to be little reason to take it past 4 grand, but maybe with a better exhaust, intake and a chip you might find more power there if you need it.

Jeep did make CJ-5's and CJ-7's with a 304 V8 back in the 70's, but I don't think you'll see a much lagrer motor during the fuel economy era. If they don't do it in 2011, Chrysler will likely put a Pentastar motor in the Wrangler in 2012. They should be able to get up to 300 hp out of that motor if the use DI.

But so far, I'm very happy with the 3.8.
04-22-2010 01:36 PM
wrangler0
Quote:
Originally Posted by scottrock View Post
That's why I said JKU (JK Unlimited)
OOPS!!! My bad....
04-22-2010 01:35 PM
scottrock
Quote:
Originally Posted by wrangler0 View Post
Couldnt disagree more...my 2 door auto w/ hardtop is far from being a dog.

I was expecting it to be a snail based on reviews I read both on here and elsewhere on the net, but as stated above, no problems merging on to a highway, no problems passing other vehicles....
That's why I said JKU (JK Unlimited)
04-22-2010 01:03 PM
wrangler0
Quote:
Originally Posted by scottrock View Post
Exactly what I hear, again and again. JKU's with hard tops & automatic trannys seem to be the dogs of the bunch... Maybe CD should have explored an optional OEM supercharger or a V-8 for the hardtop JKU.

On that note, my 2dr 6spd w/ soft top hauls butt.
Couldnt disagree more...my 2 door auto w/ hardtop is far from being a dog.

I was expecting it to be a snail based on reviews I read both on here and elsewhere on the net, but as stated above, no problems merging on to a highway, no problems passing other vehicles....
04-22-2010 11:30 AM
h2otoo
Quote:
Originally Posted by yj-genral View Post
does the T&C have the same tranny? that might be why.
Different tranny (JK is 6 speed; T&C, auto) and I am sure the gearing is different as well.

Bob
04-22-2010 10:49 AM
scottrock
Quote:
Originally Posted by Kevin View Post
What do you think the power should be? If you dropped a V-8 into one of these then what happens? Is it overpowered for the transmission, drive-lines and differential? I don't know.
Hemi swaps require a tranny swap as well. Not so sure about the TC or axles but most folks that can afford a $20k Hemi upgrade typically have the bones for those nice D60's front and rear a few have gone with Atlas TC upgrades but IIRC the RockTrac TC has been maintained in the applications were a Rubi was used.
04-22-2010 10:18 AM
Kevin
Quote:
Originally Posted by guygettnby View Post
for all the people who have agreed to this thread and think the 3.8l is plenty of power... how many of you have a 2dr and how many have a 4dr.

its sad when i have to floor the peddle in order to pass somebody. it is also sad like mentioned above that if the wind blows at all in the direction your traveling that the jeep has to shift outa OD in order to keep the same speed. IDK how anybody could be happy with the lack of power this crappy engine puts out. i guess it makes a difference where you live and what kinda driving you do.
I've got a 4-dr. auto. I do not "floor the pedal" to get around somebody. I do get out of O/D because it makes a big difference in power at speeds when you need to get around.

What do you think the power should be? If you dropped a V-8 into one of these then what happens? Is it overpowered for the transmission, drive-lines and differential? I don't know. Of course with a Jeep we're always doing something to them because it's a Jeep! You have enough power to twist drive shafts and axles in lo-range but the Jeep was made for off-road. A Jeep does not equate to "power AND speed". A Caddie, Hemi, Lexie and others will give you both. What do you think?
04-22-2010 10:14 AM
Wally Meyers It does take some getting used to. I traded in a 2006 Dodge Magnum R/T with a HEMI for my JK. The salesman (my friend) told me to remember that with this vehicle I have more time than money so if I'm in a hurry, then take a different car. He also drives a JK.
04-22-2010 09:53 AM
scottrock
Quote:
Originally Posted by guygettnby View Post
for all the people who have agreed to this thread and think the 3.8l is plenty of power... how many of you have a 2dr and how many have a 4dr.

its sad when i have to floor the peddle in order to pass somebody. it is also sad like mentioned above that if the wind blows at all in the direction your traveling that the jeep has to shift outa OD in order to keep the same speed. IDK how anybody could be happy with the lack of power this crappy engine puts out. i guess it makes a difference where you live and what kinda driving you do.
Exactly what I hear, again and again. JKU's with hard tops & automatic trannys seem to be the dogs of the bunch... Maybe CD should have explored an optional OEM supercharger or a V-8 for the hardtop JKU.

On that note, my 2dr 6spd w/ soft top hauls butt.
04-22-2010 09:38 AM
J.B.
Quote:
Originally Posted by guygettnby View Post
i guess it makes a difference where you live and what kinda driving you do.
EXACTLY! I drive like an ole sodbuster...Guess that's why I fit in around here!
04-22-2010 09:26 AM
yj-genral does the T&C have the same tranny? that might be why.
04-22-2010 08:05 AM
h2otoo
Quote:
Originally Posted by guygettnby View Post
for all the people who have agreed to this thread and think the 3.8l is plenty of power... how many of you have a 2dr and how many have a 4dr.

its sad when i have to floor the peddle in order to pass somebody. it is also sad like mentioned above that if the wind blows at all in the direction your traveling that the jeep has to shift outa OD in order to keep the same speed. IDK how anybody could be happy with the lack of power this crappy engine puts out. i guess it makes a difference where you live and what kinda driving you do.
Two door, manual shift. As stated, enough power for me. Same engine is in my 99 AWD T&C, and seems quicker even with that heavier vehicle.

Bob
04-22-2010 07:25 AM
guygettnby for all the people who have agreed to this thread and think the 3.8l is plenty of power... how many of you have a 2dr and how many have a 4dr.

its sad when i have to floor the peddle in order to pass somebody. it is also sad like mentioned above that if the wind blows at all in the direction your traveling that the jeep has to shift outa OD in order to keep the same speed. IDK how anybody could be happy with the lack of power this crappy engine puts out. i guess it makes a difference where you live and what kinda driving you do.
04-22-2010 07:20 AM
yj-genral i have no major complaints myself and i have a 33k mile 07 unlimited with auto... it goes when i want it to, i dont feel like i lost alot of power going from a 03 tacoma v6 to the jeep v6, i have seen where it has trouble some steep hills but other than that its good, getting 16-17 mpg here in east TN
04-22-2010 05:10 AM
wrangler0 Agreed!!!

I was just thinking about this yesterday.....I can't understand why so many people complain about the lack of power of the 3.8L

I have absolutely no problem merging on to a highway, passing, etc....

Yes it does react differently to accelerating quickly than you're regular car does, but....I have no complaints at all.

It actually has made me a bit more of a laid back driver, which is good in NYC sometimes!
It's too easy to be an overly aggressive driver in this town!
04-22-2010 03:58 AM
h2otoo The 3.8 is fine for what I do. Lots quicker than my old J-10 pick up

Bob
04-21-2010 07:04 PM
PecosRiver So far I've had mine up to 110. Fairly stable ride until I hit that squirrel and damned near lost it.
04-21-2010 06:53 PM
zuba I've got 09 rubicon 2 door It moves just fine with 305-70/R17 on it
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