[jeepin08123]

I have been looking around and i have been finding great deals on low mileage GC's in my area. I am really interested in the 5.7l because of power. I have heard the 5.7l has a 0-60 time of 7 seconds and really gets up and goes. So basically what im wanting to know is, how powerful is the jeep with this engine. I want something that has no problems overtaking people on the freeway and it fun to drive. Also, how big of a difference is there between the 5.7 and the 4.7 Thanks A Lot, Matt

[Remmy]

I cant say much for the 4.7 as I have never driven one. I have taken the v6 for a spin and compared to the 5.7, very dissapointing. However, in all fairness its a v6 compared to an engine thats bigger than most trucks on the road.

The 5.7 is excellent getting off from a light. Ive experienced the 'chirp' from the tires on a dry sunny day before. Overtaking is effortless and if you dont watch out youll be surprised what your speedo will say. It already rips out aroun 340+hp and the torque is up there to the 400. Its a farily well engineered car. The Mercedes transmission is so smooth I cant tell if the truck has changed gears sometime unless I look at the tachometer. Its my first personal experience with a Daimler product which definetly rivals past anything Chrysler I have ever driven for extended periods of time.

I am extremely happy with my 5.7. I almost want to say it is 'perfect' in go power but we all know man to man there is never enough. However it takes very well to simple bolt on modifications such as intakes and exhaust systems.

I do also like that it runs on 89 octane mid grade pump gas and found the manual warns not to use premium. But it can live fine on low octane.

As a big audio head the stock Boaston sound system is surprisingly good. The door woofers can sound muddy at times though. Adding a subwoofer and cutting the door speaker bass down will fix that real quick though.

My only complaints are that MDS doesnt kick in for me until 70+ mph. The door panels seem to be relative cheap 2 piece plastic. At first gas mileage was HORRIBLE. But I have found if you can control yourself and drive normal you get a decent 12.5 average in the city which is pretty damn good for an engine its size and weight of the SUV.

There are some quirks to the truck but most I have seen are a quick fix by going to a dealer and having a reflash. My problem is the idiot lights flash once inawhile but I found its a simple ignition fix. I have a friend who bought the same 5.7 year as mine (05) brand new and he has put over 150k miles on it and not one single problem. I guess because you have an engine conept thats been around for 30 years or so. Designs of that kind of age are fairly tried and true.

Go get one!

[BlueSteelJP]

The 4.7 liter is an awesome engine and has more promise than the Hemi, meaning you can do much more with the 4.7. It can even accomadate 4 valves per cylinder-something I have been told is impossible to do with the hemi because of the shape of the combustian chamber. The Hemi 5.7 liter has more power than the 4.7 liter 1st generation but the 2nd generation is similiar and unlike the hemi can accamodate E85-Flex Fuel. The 5.7 liter is limited in power even more by the computer/electronic throttle and cannot accomodate E85/Flexfuel. My last 4.7 liter with the exception of a head gasket problem, was rock solid, I put 165,000 miles on it when I traded it in and it still didn't burn a drop of oil. The 5.7 liter has alot of proving to do in the wake of the 4.7.

[LTrainGC]

I suggest you go drive one with the 4.7 and one with the 5.7 and then make your decision. I can tell you I doubt you'll be disappointed in the 5.7

[Texas WJ]

The performance gap between the 4.7 and 5.7 was diminished for the '08 and newer models.

4.7 - 235 hp / 290 lb-ft torque
4.7 II - 305 hp / 334 lb-ft torque
5.7 - 330 hp / 375 lb-ft torque

I enjoy my 5.7, but I loved the 4.7 H.O. in my old WJ. Great engine.

[LTrainGC]

With the Hemi, a 3" cat-back exhaust, intake, and a superchips tuner running the 91 tune I'm VERY pleased with the performance of the truck.

The only 4.7 I've driven is in my sister's Commander, and in a WJ. It was great in the WJ, and it moves the Commander well but it's not anywhere near as quick as my WK. Highway passing is no issue at all, and it is a BLAST to drive - especially with the Bilstein shocks/struts and a SRT rear sway bar.

[jeepin08123]

Alright, thanks for all the replies guys. Im going to test drive them both, but that hemi sounds impressive.

[oldmac1]

I have the 09 Hemi with the VVT and it is putting out 357 HP and 398 foot pounds of torque. I purchased this two weeks ago and traded in a 07 Chrysler 300 Hemi that put out 340 hp and 390 foot pounds torque. I have owned a 2005 Grand Cherokee with the 4.7 at 235hp. This new 5.7 with VVT will eat the 07C Hemi alive for lunch with only 1200 miles on this Jeep. The 2005 4.7 was anemic and would not match my wifes 04 Overland with the 260 horse version of the 4.7. The new 4.7 with 300 plus horses is a great engine but for just a tad more gas consumption I bought another Hemi. My 07C did not really reach full potential till about 20k miles, and this new 5.7 in the Jeep is acting the same way but is stronger right out of the box. Good luck with your choice.

[TJJP77]

Originally Posted by BlueSteelJP

It can even accomadate 4 valves per cylinder-something I have been told is impossible to do with the hemi because of the shape of the combustian chamber.

With all due respect, the stock heads do not have the material in them to just drill some holes and add two more valves per cylinder, and no one makes 4 valve heads for this engine, not even Chrysler. So unless you have the ability to tool and cast your own cylinder heads, I'm not sure I see your point?

[justa4banger]

Originally Posted by BlueSteelJP

The 4.7 liter is an awesome engine and has more promise than the Hemi, meaning you can do much more with the 4.7. It can even accomadate 4 valves per cylinder-something I have been told is impossible to do with the hemi because of the shape of the combustian chamber. The Hemi 5.7 liter has more power than the 4.7 liter 1st generation but the 2nd generation is similiar and unlike the hemi can accamodate E85-Flex Fuel. The 5.7 liter is limited in power even more by the computer/electronic throttle and cannot accomodate E85/Flexfuel. My last 4.7 liter with the exception of a head gasket problem, was rock solid, I put 165,000 miles on it when I traded it in and it still didn't burn a drop of oil. The 5.7 liter has alot of proving to do in the wake of the 4.7.

DUDE you are hilarious......... Shoot i wish i could just go around adding valves to my engine. thats awesome that its offered on the 4.7.........

As for E85..... well if you like paying almost the same price and get 40% less fuel economy... then go for it...use E85.
E85 in "flexfuel" vehicles is a crock of crap.
Only thing E85 is good for is serious HIGH hp apps that would normally use 9.00/gallon C16 race race. Chnage over to E85 and well you use more, but its almost 1/4 the price.
E85 works great in high compression engines or even more so in Boosted apps. Well all mass produced E85 vehicles do not raise compression just for E85 (impossible) and none of the flex fuel crap cars are boosted.

do some reading. E85 is great for the cooling characteristics and for the high Octane. But if your engine is not setup to optimize the higher Octane..... it does nothing to help you. newer engines Can not/Do not have variable compression ratios to optimize E85, So what you get is a compromise.

Flex fuel is joke as a selling point for newer vehicles

[SMRT]

With all due respect, the stock heads do not have the material in them to just drill some holes and add two more valves per cylinder, and no one makes 4 valve heads for this engine, not even Chrysler. So unless you have the ability to tool and cast your own cylinder heads, I'm not sure I see your point?

I was waiting for someone to point even one of the problems here. justa4banger posted yet another good point(s).

[Aloha8]

Originally Posted by BlueSteelJP

The 4.7 liter is an awesome engine and has more promise than the Hemi, meaning you can do much more with the 4.7. It can even accomadate 4 valves per cylinder-something I have been told is impossible to do with the hemi because of the shape of the combustian chamber. The Hemi 5.7 liter has more power than the 4.7 liter 1st generation but the 2nd generation is similiar and unlike the hemi can accamodate E85-Flex Fuel. The 5.7 liter is limited in power even more by the computer/electronic throttle and cannot accomodate E85/Flexfuel. My last 4.7 liter with the exception of a head gasket problem, was rock solid, I put 165,000 miles on it when I traded it in and it still didn't burn a drop of oil. The 5.7 liter has alot of proving to do in the wake of the 4.7.

Well... er... my 5.7 liter will indeed run on E85... Maybe I have a special edition? And I agree with the earlier post that E85 is joke on us all (but in SC we mostly all run E90).

[Remmy]

Being from Charleston, SC I never saw a drop of E85. Honestly, I cant imagine who thought that was such a great idea considering not only is it not efficient enough, it has done nothing but raise pricing on resources when it comes to corn. That may be small but it simply made everything snowball in food bills.

[HurriJeff]

Back to the topic... I love my 05' 5.7 Hemi. Ok, gripes me a bit that the new WK have 20+ more hp but its plenty fast. Tows my 4500 lb boat like its not there. Its a very satisfying engine. You'll never be at the back of the pack if you dont want to be there. If you only live to race the WK is not for you.. But if you need and SUV and you want one that is faster than most.. your going to enjoy a Hemi Grand Cherokee!

[Marcus86GLHS]

the new 4.7's are great, but the Hemi GC is just better in every area except maybe fuel economy.

for me it was a no-brainer. The Chrysler Hemi engine is a classic, ok so its not the 426 version but its a sibling of the 426 in it's pedigree, so who wouldn't want a Hemi in their Grand Cherokee?

Open the hood of both versions and step back. That alone is enough to go Hemi.