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Old 01-02-2011, 02:35 PM   #1
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test drove an '11 yesterday, power sticks

we were thinking about getting a new 4 dr and went for a test drive. its been awhile sinse i had a jeep and the last one i have ever been in was a friends tj from a few years back and it was readily good on acceleration. the new one was horrible. what are you guys doing to make it more powerful? does a chip and cold air make a great difference? still havent canceled it out, but the lack in power is scaring me away from it. i love the jeep though.

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Old 01-02-2011, 02:50 PM   #2
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lowered gearing, cold air intake, and a little 93 and you got yourself some power.

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Old 01-02-2011, 02:52 PM   #3
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Thanks. Let us know what you drive so we can flame it too.

Unless your friend's TJ had a supercharger or something, the Jeep you were in yesterday will in fact accelerate better.

I understand the onboard computer keeps new Jeeps in a "break in" period for the first couple of hundred miles, which may have been part of the problem. Also, if you were driving an auto transmission, yes, there are aftermarket chips that make a big difference. Air intakes don't do much, though I have one and like it.

The Wrangler isn't a race car, however. The 2012 will be getting a more powerful engine if it's important to you.
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Old 01-02-2011, 03:03 PM   #4
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Mine is faster downhill.
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Old 01-02-2011, 03:07 PM   #5
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dear lord. the jk has been proven faster than the tj, many times.
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Old 01-02-2011, 03:08 PM   #6
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Quote:
Originally Posted by MTH View Post
Thanks. Let us know what you drive so we can flame it too.

Unless your friend's TJ had a supercharger or something, the Jeep you were in yesterday will in fact accelerate better.

I understand the onboard computer keeps new Jeeps in a "break in" period for the first couple of hundred miles, which may have been part of the problem. Also, if you were driving an auto transmission, yes, there are aftermarket chips that make a big difference. Air intakes don't do much, though I have one and like it.

The Wrangler isn't a race car, however. The 2012 will be getting a more powerful engine if it's important to you.
Well, he said it was a 4 door, so the TJ was definately faster.
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Old 01-02-2011, 03:09 PM   #7
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Well, he said it was a 4 door, so the TJ was definately faster.
Even downhill?
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Old 01-02-2011, 03:12 PM   #8
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Even downhill?
Well, heavy things are faster downhill...
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Old 01-02-2011, 03:16 PM   #9
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Well, he said it was a 4 door, so the TJ was definately faster.
the 3.8 tests at 3 tenths of a second faster to 60 (which would be a good half a second in a 1/4 mile) than the 4.0 in a 2 door vs. 2 door test, i'd bet the jku is just about even with the 4.0. but, who the hell drag races a stock jeep anyway?
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Old 01-02-2011, 03:25 PM   #10
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the 3.8 tests at 3 tenths of a second faster to 60 (which would be a good half a second in a 1/4 mile) than the 4.0 in a 2 door vs. 2 door test, i'd bet the jku is just about even with the 4.0. but, who the hell drag races a stock jeep anyway?
Well considering that the JKU is 4200 lbs, and the TJ is 3200 with the 4.0, I'd say the TJ still wins. But you're right, it's pretty much a moot point. It's a jeep!
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Old 01-02-2011, 03:28 PM   #11
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the 3.8 tests at 3 tenths of a second faster to 60 (which would be a good half a second in a 1/4 mile) than the 4.0 in a 2 door vs. 2 door test, i'd bet the jku is just about even with the 4.0. but, who the hell drag races a stock jeep anyway?
And the 4 door and 2 door are closer in weight than a lot of people think. According to Yahoo Autos, the curb weight of a 2011 Rubi 4 door is 4315, whereas the 2 door is 4104. That's 211 pounds.
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Old 01-02-2011, 06:47 PM   #12
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Whenever i have a small race with the TJ im always the winner, either its manual or autamatic, with a CAI or a chip, it doesnt matter im always in front : )
Actually i have a quiet good acceleration in my JK untill 145 Km/h(90 m/h) when things start to get slow.
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Old 01-02-2011, 06:57 PM   #13
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Old 01-02-2011, 07:21 PM   #14
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could someone make a sticky that shows the performance stats of the 3.8 vs the 4.0! and title it 3.8 is MORE POWERFUL than 4.0
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Old 01-02-2011, 07:31 PM   #15
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Who races jeeps? Save that for bikes and sports cars!
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Old 01-02-2011, 07:39 PM   #16
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Wow, I was going to post on this today myself! I have just turned 280 miles on my '11 JKU and the only negative comment I have to say about it was it's acceleration. I in know way race it, but damn, I dont even like entering an intersection from a stop. I was going to post to see if it may have just been a problem with mine but this may lead me to believe that it is a bigger issue. I wouldn't blame you about thinking twice Rhino unless someone has a fix.
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Old 01-02-2011, 07:40 PM   #17
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A sport bike races another sport bike, a sport car races another sport car & a jeep goes for another jeep : P
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Old 01-02-2011, 08:35 PM   #18
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And the 4 door and 2 door are closer in weight than a lot of people think. According to Yahoo Autos, the curb weight of a 2011 Rubi 4 door is 4315, whereas the 2 door is 4104. That's 211 pounds.
Yahoo Autos is wrong with their curb weights. A 4 door Rubi is 4800 lbs, almost 800 lbs more than a 2 door Rubi. We weighed them on a CAT scale to see for ourselves.

As for the performance issue, cold air intakes, cat back exaust, and computer chips do very little to improve performance. The best performance improvement comes from re-gearing the differentials. For an automatic with stock 32" tires, 4.56 gears are good. For 33" tires, 4.88 gears. For 35" tires, 5.13 to 5.38 gears, depending on whether you live in the flatlands or the mountains.
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Old 01-02-2011, 08:40 PM   #19
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Old 01-02-2011, 08:41 PM   #20
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Quote:
Originally Posted by MOPWR2U

Yahoo Autos is wrong with their curb weights. A 4 door Rubi is 4800 lbs, almost 800 lbs more than a 2 door Rubi. We weighed them on a CAT scale to see for ourselves.

As for the performance issue, cold air intakes, cat back exaust, and computer chips do very little to improve performance. The best performance improvement comes from re-gearing the differentials. For an automatic with stock 32" tires, 4.56 gears are good. For 33" tires, 4.88 gears. For 35" tires, 5.13 to 5.38 gears, depending on whether you live in the flatlands or the mountains.
Always good to have firsthand input. You say you weighed a 4 door Rubi--did you also weigh a 2 door Rubi?
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Old 01-02-2011, 08:52 PM   #21
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And the 4 door and 2 door are closer in weight than a lot of people think. According to Yahoo Autos, the curb weight of a 2011 Rubi 4 door is 4315, whereas the 2 door is 4104. That's 211 pounds.
is that gvw or curb weight? i believe curb weight is about 3700 for the 2 door.
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Old 01-02-2011, 08:54 PM   #22
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could someone make a sticky that shows the performance stats of the 3.8 vs the 4.0! and title it 3.8 is MORE POWERFUL than 4.0
i've posted links to the same site that tested both tj and jk jeeps. search my posts and you'll find it. from early november i think.
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Old 01-02-2011, 08:56 PM   #23
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I'm usually a reserved driver, but when I'm late or in a tad bit of a hurry, I MASH the GO PEDAL. (skinny pedal on the right) The 3.8 comes to life... auto-trans kicks down 1 or 2 gears... 3.73 gears pull nicely on the stock 32's as the RPM's Sing on up to 5500... a smooth shift up to the next gear and I'm on my way.
Usually I get around 19.6 (Calculator Method) so you can see I do this rarely. But when I want/need it, I let my other one drop and Mash the Go Pedal.
You said that you've passed on Wranglers in your past more than once. Don't do it again. Maybe Rent a JKU for a few days (with minimum 3.73 gears) and let the Steed prove their own salt.
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Old 01-02-2011, 08:56 PM   #24
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is that gvw or curb weight? i believe curb weight is about 3700 for the 2 door.
I'm too much of a noob to know the difference Sinister. However, click on the numbers themselves in my post, which I hyperlinked to the Yahoo page. I suspect that'll give you what you need to know--including if Yahoo is just full of it.
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Old 01-02-2011, 09:13 PM   #25
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gvw is gross vehicle weight, or how much the vehicle can carry fully loaded. curb weight is what the vehicle actually weighs in road trim.

these numbers come from allpar, who are usually pretty reliable:

Wrangler X, Man. Trans………………………………………………………………………………………………..3760 lbs. (1403 kg)
Wrangler X Auto. Trans…………………………………………………………………………………………………3785 lbs. (1413 kg)
Wrangler Sahara, Man. Trans………………………………………………………………………………………..3951 lbs. (1475 kg)
Wrangler Sahara, Auto. Trans………………………………………………………………………………………..3976 lbs. (1484 kg)
Wrangler Rubicon, Man. Trans……………………………………………………………………………………….4104 lbs. (1532 kg)
Wrangler Rubicon, Auto. Trans………………………………………………………………………………………4129 lbs. (1541 kg)

The 2007-2010 Jeep Wrangler
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Old 01-02-2011, 09:23 PM   #26
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Wrangler Rubicon, Man. Trans……………&hell ip;……………&hellip ;………………& hellip;……………&he llip;……………&hell ip;…….4104 lbs. (1532 kg)

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So Yahoo was dead on with the two door Rubi. I didn't see anything about the 4 door, though if the prior poster is right it comes in at 700 pounds more. That seems like a lot . . . .
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Old 01-02-2011, 09:31 PM   #27
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700 seems reasonable when you think about everything that goes into lengthening the jeep. chassis, sheetmetal, another set of doors, seats, longer rollbar, driveshaft, exhaust piping.........
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Old 01-02-2011, 09:49 PM   #28
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For crying out loud its a jeep not a formula one race car.
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Old 01-02-2011, 10:30 PM   #29
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For crying out loud its a jeep not a formula one race car.
listen, im not trying to buy a race car, i has a car for really going fast. but, like spm488 said, it sucked getting into traffic with it. ive had a jeep when i was younger, i love jeeps, not flaming the JEEP. BUT, i am saying that the company might have went the wrong route with the power in this thing. im not the only person who thinks their could be better engine options. but seeing that i am still interested in the wrangler, i was asking, sinse the power in this sucks so bad, if i do get one, what can be done to better the vehicle, sinse i , again, do love the jeep itself.

whoever took this as a flaming post is wrong. its a, i really want a jeep, but the power sucks post. even compared to jeeps i have been in in the past. and no, the tj my friend had was the 4.0 and it was quick on acceleration
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Old 01-02-2011, 11:04 PM   #30
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If power is such an important thing to you, you will not be happy with a wrangler and should look for something else. CAI, exhausts and programers might add 6-8%. However, for $5000 more you can have a supercharger, which gets the power up to 300 hp. Several are happy with them. Another option would be a hemi conversion which will be in the area of $15000+. These are the only two ways to turn a 5000# brick into a performance machine.

Most of us don't buy the JK for performance. My JKU with 513s and 35s has all the power I need and is just plain fun to drive.

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