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Old 12-31-2010, 01:30 PM   #31
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Quote:
Originally Posted by MikeMYJ
The 4.0 is hands down a better engine, but there is nothing wrong with the 3.8. I think you'll find it more then adequate if you do it right.

I mean come on, you know you are getting a Porsche. It's a jeep.
What evidence are you using with this asumption, because i know its been shown time after time that the 3.8 power to weight ratio is better than the 4.0. Ive watched my 3.8 climb up things in 4hi that a tj could barely do in low, maybe this is attributed mostly to gearing, but when you get down to brass tacks, engine power is barely relevant on an offroad vehicle compared to gears, axles, and tires. Last time i checked the tj had a massively underpowered engine with the 4 banger an it was still just as capable as a 4.0. Horsepower means jack sh*t offroad, its all about torque and gears. The m1114 humvees we use in the marines have a 160 horsepower diesel engine in them, but that doesnt matter because they put out incredible amounts torque. The 4.0 and 3.8 do exactly what they were designed to do, and have both been powering chrysler vehicles for almost 2 decades, this arguement needs to just die already.

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Old 12-31-2010, 01:45 PM   #32
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Originally Posted by ncossey

What evidence are you using with this asumption, because i know its been shown time after time that the 3.8 power to weight ratio is better than the 4.0. Ive watched my 3.8 climb up things in 4hi that a tj could barely do in low, maybe this is attributed mostly to gearing, but when you get down to brass tacks, engine power is barely relevant on an offroad vehicle compared to gears, axles, and tires. Last time i checked the tj had a massively underpowered engine with the 4 banger an it was still just as capable as a 4.0. Horsepower means jack sh*t offroad, its all about torque and gears. The m1114 humvees we use in the marines have a 160 horsepower diesel engine in them, but that doesnt matter because they put out incredible amounts torque. The 4.0 and 3.8 do exactly what they were designed to do, and have both been powering chrysler vehicles for almost 2 decades, this arguement needs to just die already.
*Applause*

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Old 12-31-2010, 01:47 PM   #33
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Originally Posted by jp2611
While the "IDEA" of a HEMI wrangler sounds great, as most of us use them as a DD I think the fun of having that much power would eventually having us wishing for a different set-up. The cost of gas alone has people complaining now-and with that much power/torque how big would the tires get and how low would the gears go? Talk about crawling!!!!
I'm not sure why else he had to change, but I was told at my stealership that a customer ordered a crate HEMI for his 2011 Rubi to be installed before he would pick it up....

I can't wait to see/hear that
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Old 12-31-2010, 06:23 PM   #34
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2011 4dr working great

I've got a '11 4-door and have put a couple thousand miles on it already. There's nothing wrong with that engine, although I could easily see if you are used to bombing around in a CJ with a 304 V8 that can yank the front wheels off the ground at the stoplight that it feels 'underpowered'...

People piss and moan about just about everything...give it a test drive and if you like it, buy it!
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Old 12-31-2010, 10:04 PM   #35
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yeah, the 304 is best used as a boat anchor. people with "fond memories" of that engine are suffering from alzheimer's
Jeep Engine: AMC 304 V8
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Old 01-01-2011, 09:55 PM   #36
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Smile To Hemi or not to Hemi---

One solution is to look at AEV's Hemi Conversion package. You can get the 5.7L with VVT and cylinder de-activation for better gas mileage while bumping up the HP. They also offer a 6.1L and a 7.0L version for even more power, but without VVT and Cyl de-activation. My JKU Sahara is a DD with an occasional run on the beach at the OBX. Also the occasional snow and ice thing in the Smokies. Therefore, I am considering the 5.7L without the lift, but do want the better axles, front bumper and winch, plus their rear bumper with swingaway rack.

The most pressing need is better brakes. I get a lot of front brake 'chatter' when I drop off the Interstate at speed onto one of the many short off-ramps around Orlando. I see Teraflex offers a Big Brake conversion for the front discs. Those, plus S/S brake lines, should do the trick as long as I don't go to larger tires and wheels.
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Old 01-01-2011, 10:20 PM   #37
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Originally Posted by vetterun
One solution is to look at AEV's Hemi Conversion package.
Two things . . .

First, I thought hemi conversions are usually around a $20k+ project. AEV lists the basic kit at $4k. So . . . $16k of labor for a pro install?? Really?

And, second, you must--must--post pics of this when it's done.
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Old 01-01-2011, 10:25 PM   #38
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Two things . . .

First, I thought hemi conversions are usually around a $20k+ project. AEV lists the basic kit at $4k. So . . . $16k of labor for a pro install?? Really?

And, second, you must--must--post pics of this when it's done.
You don't seriously think you can buy all the parts for a hemi swap for 4k?

Look at AEV's site. It will explain all the parts you get and don't get.
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Old 01-01-2011, 10:27 PM   #39
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bad motor

I have 20,000 on my 08 and its going in the shop for a new motor, the crank is of balance.
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Old 01-01-2011, 10:44 PM   #40
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Originally Posted by MR.CLIFFORD
You don't seriously think you can buy all the parts for a hemi swap for 4k?
No, I don't. That's why I asked.
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Old 01-01-2011, 11:43 PM   #41
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Originally Posted by donsvideo
I have 20,000 on my 08 and its going in the shop for a new motor, the crank is of balance.
What were your symptoms?
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Old 01-02-2011, 08:53 AM   #42
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To Hemi or not to Hemi

The full-blown conversion is about $26K (installed) and includes full skid plate pkg, 3" lift, front and rear bumpers, Warn 9.5ti winch, ProCal, Heat Reduction Hood, Dana 44 Front and Dana 60 Rear axles with 4.88 gears, 5-speed auto tranny with 5.7L VVT Hemi, Pintler non-Beadlocks with BFG's, etc. I don't want the lift kit or the wheels & tires. I want to maintain a somewhat stock stance and will probably put some slightly oversize 18's on my stock rims. The ProCal will allow me to adjust my speedometer to correct.

When I last spoke with them, they are developing the Snorkel Kit (currently only available for the 3.8L) for the 5.7L, which is supposed to boost power to near the 6.1L non-VVT output (~405 HP). I've laid out to them what I want, including the TeraFlex Big Brake Kit; but they haven't gotten back to me with pricing. I'm hoping for $16K - $18K. We'll see.

BTW: I've got a 2008 JKU Sahara with 13K miles. I have a Condo in Orlando where I work and I have a home in Rock Hill, SC. Around town, with my driving style, I only get 12 mpg. On the interstate, I get about 17 mpg. I just made a run from Orlando to Rock Hill last Thursday night. It took me 6.5 hours to cover the 526 miles and I got 17.1. All with the 3.8L. My biggest problem with the 3.8L is the valve/lifter rattle at a cold start. That does not bode well for longevity IMHO. Secondly, at speed, it has no real pick-up when you punch it to pass or to go for the open hole in a gaggle of traffic that you inevitably encounter on long road trips on the Interstate. BTW: That reminds me, I have to get a set of the S/S mechanical Hood Latches. My Hood does 'flutter' at speed with the stock rubber bungee straps.. It can be very un-settling if you pay attention to it.....

Plus, I'm sick and tired of the little rice-burners getting in my way around town.
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Old 01-02-2011, 09:52 AM   #43
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I have had a YJ with a 4.0 and now have a JK with the 3.8. I think the engines are very comperable. If you want a street screamer then the jeep is not for you. As a DD the 3.8 is quite capable. Off road not doing a Baja, the 3.8 has more than enough power to pull you up a mountain covered with bolders.
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Old 01-02-2011, 03:12 PM   #44
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When I last spoke with them, they are developing the Snorkel Kit (currently only available for the 3.8L) for the 5.7L, which is supposed to boost power to near the 6.1L non-VVT output (~405 HP).
i hate to tell you this, but NO snorkel kit is going to add that much power unless there is a supercharger/turbo attached to the end of it.
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Old 01-02-2011, 03:30 PM   #45
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Originally Posted by vetterun View Post
The full-blown conversion is about $26K (installed) and includes full skid plate pkg, 3" lift, front and rear bumpers, Warn 9.5ti winch, ProCal, Heat Reduction Hood, Dana 44 Front and Dana 60 Rear axles with 4.88 gears, 5-speed auto tranny with 5.7L VVT Hemi, Pintler non-Beadlocks with BFG's, etc. I don't want the lift kit or the wheels & tires. I want to maintain a somewhat stock stance and will probably put some slightly oversize 18's on my stock rims. The ProCal will allow me to adjust my speedometer to correct.

When I last spoke with them, they are developing the Snorkel Kit (currently only available for the 3.8L) for the 5.7L, which is supposed to boost power to near the 6.1L non-VVT output (~405 HP). I've laid out to them what I want, including the TeraFlex Big Brake Kit; but they haven't gotten back to me with pricing. I'm hoping for $16K - $18K. We'll see.

BTW: I've got a 2008 JKU Sahara with 13K miles. I have a Condo in Orlando where I work and I have a home in Rock Hill, SC. Around town, with my driving style, I only get 12 mpg. On the interstate, I get about 17 mpg. I just made a run from Orlando to Rock Hill last Thursday night. It took me 6.5 hours to cover the 526 miles and I got 17.1. All with the 3.8L. My biggest problem with the 3.8L is the valve/lifter rattle at a cold start. That does not bode well for longevity IMHO. Secondly, at speed, it has no real pick-up when you punch it to pass or to go for the open hole in a gaggle of traffic that you inevitably encounter on long road trips on the Interstate. BTW: That reminds me, I have to get a set of the S/S mechanical Hood Latches. My Hood does 'flutter' at speed with the stock rubber bungee straps.. It can be very un-settling if you pay attention to it.....

Plus, I'm sick and tired of the little rice-burners getting in my way around town.
If you didn't know, you also need a 1" body lift to put in a hemi. The engine won't clear the frame otherwise.
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Old 01-02-2011, 03:34 PM   #46
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i hate to tell you this, but NO snorkel kit is going to add that much power unless there is a supercharger/turbo attached to the end of it.
He is currently using a McDonalds straw pulling air from on top of his muffler for an air intake, so it just might
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Old 01-02-2011, 03:50 PM   #47
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nate.....time to post the picture of the dead horse again!
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Old 01-02-2011, 07:49 PM   #48
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a vibration when idling when you just touch the gas it vibrates and also in overdrive at around 45 or when there is a load on the motor in overdrive
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Old 01-02-2011, 08:04 PM   #49
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Correct me if i am wrong but all the 3.8L mini vans that i have worked on have cast iron heads. I think the JK that i looked at had aluminum heads. Personally I would stay away from any eng. that had aluminum heads.
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Old 01-02-2011, 09:06 PM   #50
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He is currently using a McDonalds straw pulling air from on top of his muffler for an air intake, so it just might
all i'm saying is the newer hemi 5.7 makes what, 360hp in the GC with the factory airbox? 45hp from a snorkel kit? i will straight call bs on that. i would only hope they're not promising figures they know they can't meet off on people who don't know any better. hennessey comes to mind.......
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Old 01-02-2011, 09:09 PM   #51
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Correct me if i am wrong but all the 3.8L mini vans that i have worked on have cast iron heads. I think the JK that i looked at had aluminum heads. Personally I would stay away from any eng. that had aluminum heads.
do you know how many modern engines run aluminum heads?
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Old 01-03-2011, 10:24 AM   #52
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Smile To Hemi or not to Hemi

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all i'm saying is the newer hemi 5.7 makes what, 360hp in the GC with the factory airbox? 45hp from a snorkel kit? i will straight call bs on that. i would only hope they're not promising figures they know they can't meet off on people who don't know any better. hennessey comes to mind.......
To correct my mis-statement, not AEV's: The addition of VVT plus the Snorkel is supposed to bump up the standard 5.7L Hemi output to near the 6.1L, which does not offer VVT or Snorkel. I mentioned the VVT option in my original post. Sorry if i confused you.

You're inference that I "do not know any better" is insulting. Lots of people on these boards/forums act that way when they think they are anonymous. Give it up.

Surely you don't think I'm going to spend $20K (or more!) without doing my homework. AEV has an outstanding reputation in the industry, provides the well-respected ProCal module, and does military conversions for the US Govt (J8 MILSPEC). I compared their product against a number of others before contacting them.

I live in Central Florida. Not many mountains in Florida. Not much rock-crawling occurs here either. Just 'mudding, mostly (not my bag). As I stated in my original post, I am planning on spending some time on the sand at the OBX and the occasional fun in the snow when I travel to the Carolinas. The rest of the time, the Jeep is a DD.

I never criticize folks for modifying their vehicle to suit their perceived needs. I am always impressed by their ingenuity and creativity. I always try to compliment them on their 'out-of-the-box' approach. It's their money and their time, too. Who am I to criticize?

Thank you! to the gentleman for the info on the 1" lift requirement for the Hemi install. That shouldn't be too bad. I don't want to create a vehicle that drives great on the rocks but is un-stable on pavement, where I drive 90% of the time. That's why I joined this forum: to benefit from the knowledge of others who have been there and done that.
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Old 01-04-2011, 07:02 AM   #53
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i'm not saying YOU don't know any better, i'm saying they will most likely have customers who don't. at that price, they better damn well deliver on every single pony they promise.
let me assure you, if i thought you were an idiot, i'd say it and i'd say it to your face if given the opportunity. but, that's not the case.

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