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Unread 09-02-2007, 03:15 PM   #1
YellowTJ06
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Hemi vs 4.7L

I'm looking to buy a 2006 Grand Cherokee in the near future and I'm debating about whether to get the Hemi 5.7 or the v8 4.7? Our plan in to two our TJ and jetski's with it, but also down the road we are considering a 21-23 ft boat. I'm sure the 4.7 will perform just fine, but was wondering if the Hemi was worth the extra money for better towing performance or if it was just underkill? Any advice would be appreciated.

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Unread 09-03-2007, 05:42 AM   #2
crod
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i could be wrong because i havent actually owned one yet.(looking)

but it seems like to me the 4.7 is kind of a waste of time without hardly any noticable diff. in mpg.....
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Unread 09-03-2007, 10:04 AM   #3
HurriJeff
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As someone with plenty of experience towing boats.. even a 21 ft boat will be heavy behind either engine. If your only towing lets say 10 miles to a ramp and launching only the 4.7 will "do". If your planning on going more than that espcially if you will be doing it more than say once a year go ahead and get the 5.7. Mine tows a 25 ft inflatable with little trouble at all but its only about 3000Lbs. My biggest problem is stopping that much weight. The WK's brakes are good for its own weight but not so great with 3000 Lbs. I would say that anything over 2000Lbs should have its own brakes.

As far as fuel economy.. I think its actuall only 2 or 3 miles per gallon better with the 4.7.
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05 Grand Cherokee Limited 5.7 Hemi 265/65/17 Revos, K&N
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1998 ZJ Special Edition 2wd- Traded
1991 XJ 2.8 2wd Sold

Last edited by HurriJeff; 09-04-2007 at 04:29 PM..
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Unread 09-03-2007, 10:10 AM   #4
ajmorell
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Haven't driven the 5.7 but I was very unimpressed with the power from the 4.7 in the WK. If you are going to tow your TJ, get the 5.7 or the CRD and make sure you have a trailer with brakes on it.
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Unread 09-03-2007, 10:24 AM   #5
garsarno
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When we evaluated the 2007 in 12/06, the dealer gave us the Hemi first to drive Then we drove the 4.7 and, after driving the 4.7 for 3 minutes, took the Hemi. Never looked back since...
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Unread 09-03-2007, 10:54 AM   #6
YellowTJ06
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Thanks for the info and more personal stories would really help. Of course we're leaning towards to Hemi but just wanted to be sure we weren't overkilling the situation.
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Unread 09-03-2007, 01:26 PM   #7
zjkid
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im not sure if you know this but the hemi is actually cheaper for chrysler to produce than the 4.7.
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Unread 09-03-2007, 06:11 PM   #8
05HemiQuadII
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Not sure what exactly you are looking to buy, but I have an extremely clean 05 hemi limited,4100 miles, that I need to sell badly. PM me if you might be interested
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Unread 09-03-2007, 07:47 PM   #9
Laredo Man
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4.7 vs hemi

I own a 2006 GC with the 4.7. I have not driven a GC with the hemi but I'm sure it performs better with the hemi. I look at it this way. The 4.7 is rated to tow 6500 lbs. The 5.7 is rated to tow 7200 lbs. and they are both rated to tow a 30 foot trailer. The 4.7 develops 305 ft.lbs of torque @ 3600 rpm. The hemi develops 375 ft.lbs of torque @ 4000 rpm. Since the 4.7 develops its max. torque at alower rpm it should tow almost as good as the hemi and this is proven by only 700 lbs difference in tow capacity. Judging by the posts I've read on this forum, the 4.7 gets approx. 2 mpg better fuel milage. Coupled with the fact that the hemi runs much better on premium gas, there is a difference of about $10.00 per tank full. It all depeds what you want to do with your WK. For me the 4.7 is enough. If your not stuck on the "It's got a hemi" attitude I think the 4.7 will perform fine. I also like it's more modern overhead cam design. Of course I'm slightly biased. I don't think you can go wrong with either engine. Get your self a WK, you'll love it.
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Unread 09-04-2007, 05:44 AM   #10
07WKLtd
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When shopping for my WK, my initial feeling was that I was buying a Hemi - why not, I figured. It's only an $800 option.

I test drove a Hemi, and it was nice - had power all over the place. I did notice a bit of lag between when you hit the throttle and it goes, as well as some pretty odd noises (it sounded really rough at idle - like a diesel or like i needed a valve job already...). When the MDS kicks in, it sounded even funnier. Combine with that it's need for higher octane gas and overall higher fuel consumption than the 4.7, I figured it would be worthwhile to check out the 4.7.

The 4.7 has adequate power, and doesn't sound like it needs valve adjustment. I don't do any towing, so tow capacity wasn't really a consideration. I'm pretty sure that 'Hemi-shudder' is a 05-06 issue, but that also helped push me towards the 4.7.

To sum it up, the 5.7 is a powerful and inexpensive option, but wasn't worth it to me. I'm glad I didn't pay $800 for it. Looking back, the only way I would have gotten the Hemi is if they discounted the vehicle ~$500, rather than it costing $800 extra.

Don't get me wrong, I don't dislike the hemi. I just don't see it as a must-have option that I'd pay an extra $0.01 for.
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Unread 09-04-2007, 01:54 PM   #11
garsarno
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If this was a new Hemi Grand Cherokee, then something was major wrong with the vehicle. Our '07 Hemi has 13,000 miles on it and outside of the "Hemi tick", runs well even on regular.
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Unread 09-04-2007, 03:39 PM   #12
07WKLtd
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Quote:
Originally Posted by garsarno
If this was a new Hemi Grand Cherokee, then something was major wrong with the vehicle. Our '07 Hemi has 13,000 miles on it and outside of the "Hemi tick", runs well even on regular.
Perhaps it's this 'Hemi tick' that I heard and sounded like a diesel or a motor with a valve/lifter problem. Either way, it drove me nuts.
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Unread 09-04-2007, 04:26 PM   #13
HurriJeff
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For the record.. the 5.7 owners manual recomends only regular or mid grade fuels. The 5.7 HEMI runs as well or better on 87 or 89 octane fuel than on 91 or 93.
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05 Grand Cherokee Limited 5.7 Hemi 265/65/17 Revos, K&N
HEMI CLUB MEMBER #10
Previous Jeeps:
1998 ZJ Special Edition 2wd- Traded
1991 XJ 2.8 2wd Sold
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Unread 09-04-2007, 04:29 PM   #14
garsarno
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Ditto on the premium. Filled it with premium on the tird day of ownership and I thought the power went down. Runs best on 89 octane, second best on 87, third on 91 and forget about 93.
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Unread 09-04-2007, 08:50 PM   #15
CEPCNC
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Also, don't forget that the Gen 2 4.7L is getting a well-deserved power boost for this production year.
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