Go Back   Jeep Garage - Jeep Forum > Jeep Platform Discussion > Grand Cherokee - WK

Join Jeep Garage Today
Reply
 
Thread Tools Display Modes
 
  #1  
Old 03-04-2011, 03:55 PM
stefano's Avatar
Member
 
Join Date: Feb 2011
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 1351
stefano is on a distinguished road
Is there a big power difference Hemi vs. 4.7?

I've been looking around at a few 2008 and 2009 Limiteds and Overlands and I'm wondering if there is a huge, noticable difference in power/torque between the Hemi vs. the 300 HP 4.7 V8? If I buy a 4.7 I plan on adding a Magnaflow catback, a CAI and if I can chip it I will. That is if I don't find a Hemi. If it is a Hemi, I still add an exhaust and CAI. Anyway, thanks ahead for any input.
__________________

__________________
Reply With Quote
  #2  
Old 03-04-2011, 04:01 PM
08Hemi's Avatar
Senior Member
My Jeep: 2008 5.7L WK
 
Join Date: Jun 2009
Location: Santa Barbara, CA
Posts: 4,296
Thanks: 0
Thanked 26 Times in 31 Posts
Rep Power: 330453
08Hemi has a reputation beyond repute08Hemi has a reputation beyond repute08Hemi has a reputation beyond repute08Hemi has a reputation beyond repute08Hemi has a reputation beyond repute08Hemi has a reputation beyond repute08Hemi has a reputation beyond repute08Hemi has a reputation beyond repute08Hemi has a reputation beyond repute08Hemi has a reputation beyond repute08Hemi has a reputation beyond repute
Re: Is there a big power difference Hemi vs. 4.7?

there are guys on here that will back both engines up...the 4.7 is a great engine IMO. I had one in my 02 Dakota and they made improvements over the years. I have a 08 5.7 now, and if you do get the Hemi I would recommend getting an 09+...they juiced the hemi a bit in 09. Either way, with an intake/exhaust/tune you will be very impressed with both. For a lot of towing and steep grades and/or long hauls, I would prolly recommend the hemi...for daily use, maybe a tad better gas mileage and still plenty of power I would go 4.7 I will lets others chime in, but thats my 0.02 FWIW!
__________________

__________________
Reply With Quote
  #3  
Old 03-04-2011, 04:34 PM
Senior Member
My Jeep: 2006 5.7L WK
 
Join Date: Dec 2009
Location: Home of the Mountain Blue Bird
Posts: 1,016
Thanks: 0
Thanked 22 Times in 20 Posts
Rep Power: 154985
jeepgcoman has a reputation beyond reputejeepgcoman has a reputation beyond reputejeepgcoman has a reputation beyond reputejeepgcoman has a reputation beyond reputejeepgcoman has a reputation beyond reputejeepgcoman has a reputation beyond reputejeepgcoman has a reputation beyond reputejeepgcoman has a reputation beyond reputejeepgcoman has a reputation beyond reputejeepgcoman has a reputation beyond reputejeepgcoman has a reputation beyond repute
Re: Is there a big power difference Hemi vs. 4.7?

I agree with 08Hemi. I haven't ever owned a 4.7, but I've also never heard anything bad about them on any of the forums. In some cases they may even be a little more trouble free than the 5.7's. Also, there seems to be about an equal number of aftermarket tuners, exhausts, intakes, etc. for both. The one thing I don't know is whether the 4.7's have readily available ported heads, cams, etc. like the Hemi's do, in case you plan on doing some serious mods. One other thing to consider, IMO, is that a properly working MDS on the 5.7 will yield a little better fuel economy than the 4.7. Bottom line, IMO, is I'll take my Hemi's. I've had one (LX) for almost 7 years now and haven't had to do anything except scheduled maintenance. I've had my WK for about a year and a half now and, other than scheduled maintenance, have only had an EGR valve go bad, and yesterday I changed the O2 sensors, because the originals were starting to get lazy in their response.
__________________
05 LX/RT & 06 WK/GCO, modded similarly, MDS "ON" Light, Vortex Gens, Debadged, DashHawk, BT Catch Can, SRT CAI W/Add Air Inlet, K&N Filter, Sonnax Trans Press Booster, SC Tuner W/Adv Trans Tuning App, DS Tuner, Cust tube headers w/3 in. catback, Bilsteins, SRT frt/rear bumpers, Eibach SRT Lwr Sprgs & Sways, FRI Sidewinder Cam Adv 2*, 6.1 valvetrain, SLP 25% UD Pulley, BBK 90mm TB, SOS Coils/.060 plug gaps. 20 in. SRT Reps.
Reply With Quote
  #4  
Old 03-04-2011, 04:50 PM
sean6365's Avatar
Member
My Jeep: 2005 5.7L WK
 
Join Date: Feb 2011
Location: Eden, NC
Posts: 66
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 1410
sean6365 is on a distinguished road
Send a message via Yahoo to sean6365
Re: Is there a big power difference Hemi vs. 4.7?

I also agree with 08Hemi. I also had a dakota with the 4.7 in it. Great truck with good power. IMO though I think the 5.7 has noticeable power difference. But thats comparing it my dakota not a WK with a 4.7.
__________________
Reply With Quote
  #5  
Old 03-04-2011, 05:08 PM
1_\/\_WK's Avatar
Member
My Jeep: 2005 4.7L WK
 
Join Date: May 2010
Location: Suffolk, Virginia
Posts: 293
Thanks: 0
Thanked 2 Times in 2 Posts
Rep Power: 1910
1_\/\_WK is on a distinguished road
Re: Is there a big power difference Hemi vs. 4.7?

I love my 4.7L. I test drove a HEMI and it felt more powerful but I went with the 4.7L and love it. Its a strong engine and sounds great without any performance mods (they will be added soon though ) On occasion I pull a horse trailer which weighs 1900 lb. empty and roughly +1000 lb. when 1 horse is on. Not to mention I have a 2.25 lift and bigger tires. Pulls the trailer great. It would be nice to have a HEMI but the 4.7 is enough motor for me! I am happy with my decision, especially since gas around here is steadily on the rise! Good luck with whatever you side with.
__________________
[SIGPIC][/SIGPIC]
2005 4.7L WK | Rocky Mountain Edition | 2.25'' Rocky Road Lift | 1.5'' Spacers | BFG Mud Terrains on painted Rubicon Rims| Pinch-weld mod | Saguaro CB Antenna Mount | 3' Firestick CB Antenna | Coba CB | ROLA Roof Rack | 7% Tint (What the cop said :lol:)
Reply With Quote
  #6  
Old 03-05-2011, 10:42 AM
Kman09JGC's Avatar
Member
My Jeep: 2009 4.7L WK
 
Join Date: Oct 2009
Location: Twinsburg, Ohio
Posts: 258
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 2280
Kman09JGC has a reputation beyond reputeKman09JGC has a reputation beyond reputeKman09JGC has a reputation beyond reputeKman09JGC has a reputation beyond reputeKman09JGC has a reputation beyond reputeKman09JGC has a reputation beyond reputeKman09JGC has a reputation beyond reputeKman09JGC has a reputation beyond repute
Re: Is there a big power difference Hemi vs. 4.7?

I have never owned a hemi but I had a 99 WJ 4.7 and I have 09 WK 4.7 now. The 4.7 is a very strong engine. My 99 4.7 ran strong for 10 yrs without a problem. Sold it to my brother when I bought my 09. If you go with the 4.7 go with 08-09's. They compare with the 05-08 hemi. I have driven a 07 hemi and a 09 hemi. The 09 hemi was fast and pulled hard. You cant go wrong with either one. Good luck!
__________________
Reply With Quote
  #7  
Old 03-05-2011, 10:49 AM
jeepnjeep's Avatar
Senior Member
My Jeep: 2005 4.7L WK
 
Join Date: Jul 2009
Location: Nassau, NY
Posts: 1,381
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 3330
jeepnjeep is just really nice
Re: Is there a big power difference Hemi vs. 4.7?

08Hemi pretty much said it all. I believe the Hemi requires 91 octaine gas too, right? Real world gas mileage is so close as not to be a factor from what I've read. The 4.7 in My '05 with a drop in K&N and a Magnaflow muffler has plenty of power to me and the newer ones are even more powerful totally stock. If your not a real power freak and mostly just drive every day with some towing too, the 4.7 is plenty. Great engine.
__________________
Hi, Im JIM
2005 Grand Cherokee Laredo
4.7 Ltr engine.
Tow pkg.
Cargo pkg.
So far K@N replacement air filter,hood scoops, 255/65/17 General Grabber AT2 tires, Magnaflow muffler and I trimmed the front valance under the bumper.
"An unarmed man can only flee from evil and evil is not overcome by fleeing from it."Col. Jeff Cooper
Reply With Quote
  #8  
Old 03-05-2011, 11:01 AM
Member
My Jeep: 1979 2.4L SRT8 WK2
 
Join Date: Feb 2011
Posts: 128
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 1479
08limited is on a distinguished road
Re: Is there a big power difference Hemi vs. 4.7?

i would go with the 4.7 i had one in a 2000,2004 and now i just bought a 2008 with a hemi and hate it i get about 11 mpg versus 14mpg in the 04 and i have to run 89 octane not 91
__________________
Reply With Quote
  #9  
Old 03-05-2011, 12:02 PM
jeff05wk's Avatar
Senior Member
My Jeep: 2005 4.7L WK
 
Join Date: Oct 2010
Location: Boiling Springs, SC
Posts: 1,817
Thanks: 0
Thanked 61 Times in 56 Posts
Rep Power: 1221062
jeff05wk has a reputation beyond reputejeff05wk has a reputation beyond reputejeff05wk has a reputation beyond reputejeff05wk has a reputation beyond reputejeff05wk has a reputation beyond reputejeff05wk has a reputation beyond reputejeff05wk has a reputation beyond reputejeff05wk has a reputation beyond reputejeff05wk has a reputation beyond reputejeff05wk has a reputation beyond reputejeff05wk has a reputation beyond repute
Garage
Re: Is there a big power difference Hemi vs. 4.7?

I absolutely love my 4.7, but I will be getting a 6.4 in 2013 (when I can buy a used one for $15,000 less than new) Whether it comes in a Grand Cherokee SRT8 or a Challenger SRT8 I do not know yet.
__________________
Reply With Quote
  #10  
Old 03-05-2011, 01:12 PM
Member
My Jeep: 2005 4.7L WK
 
Join Date: Jan 2011
Location: Omaha
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 1403
offaxis is on a distinguished road
Re: Is there a big power difference Hemi vs. 4.7?

I have a 05 4.7 and i love it. My mileage is around 16-17.
__________________
Reply With Quote
  #11  
Old 03-05-2011, 01:57 PM
boss_hemi's Avatar
Premium Member
My Jeep: 2005 5.7L WK
 
Join Date: Nov 2009
Location: Jackson, Michigan
Posts: 162
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 1960
boss_hemi is on a distinguished road
Re: Is there a big power difference Hemi vs. 4.7?

if power is a big deal, get the HEMI. i raced a 4.7 and walked away no problem, the 4.7 is a good motor and strong "enough", but the price won't be too different from a 4.7 and when people see your jeep they'll ask, "you gotta HEMI?" and you can say "yeah, it's got a HEMI" lol.
__________________
BOSS_HEMI
Reply With Quote
  #12  
Old 03-05-2011, 04:13 PM
Senior Member
My Jeep: 2006 5.7L WK
 
Join Date: Dec 2009
Location: Home of the Mountain Blue Bird
Posts: 1,016
Thanks: 0
Thanked 22 Times in 20 Posts
Rep Power: 154985
jeepgcoman has a reputation beyond reputejeepgcoman has a reputation beyond reputejeepgcoman has a reputation beyond reputejeepgcoman has a reputation beyond reputejeepgcoman has a reputation beyond reputejeepgcoman has a reputation beyond reputejeepgcoman has a reputation beyond reputejeepgcoman has a reputation beyond reputejeepgcoman has a reputation beyond reputejeepgcoman has a reputation beyond reputejeepgcoman has a reputation beyond repute
Re: Is there a big power difference Hemi vs. 4.7?

On the Hemi, unless 08's and above have changed, 89 is recommended and 87 in "OK". I've run 87 in my Hemi LX since new and also run it in my Hemi WK. If you're running 91>, unless you're racing, you're wasting your money. In most cases you'll also get worse mileage.

Realistically, if both 4.7/5.7 properly working, were driven by the same person, the same way over the same route, the in town mileage would be pretty close on both. On the highway the Hemi would have a slight advantage due to the MDS. Anyone that is getting 10-11 mpg with either drives mostly stop and go, drives like they stole it all the time, or has issue(s) with the way the vehicle is setup/tuned, or in the case of the Hemi, may have the wrong weight oil in the engine....among other things. I do believe that the Hemi's are more sensitive when the slightest thing is not "right on".....i.e PCV system contamination, MAP Sensor, EGR Valve, spark plug type and correct weight oil.
__________________

__________________
05 LX/RT & 06 WK/GCO, modded similarly, MDS "ON" Light, Vortex Gens, Debadged, DashHawk, BT Catch Can, SRT CAI W/Add Air Inlet, K&N Filter, Sonnax Trans Press Booster, SC Tuner W/Adv Trans Tuning App, DS Tuner, Cust tube headers w/3 in. catback, Bilsteins, SRT frt/rear bumpers, Eibach SRT Lwr Sprgs & Sways, FRI Sidewinder Cam Adv 2*, 6.1 valvetrain, SLP 25% UD Pulley, BBK 90mm TB, SOS Coils/.060 plug gaps. 20 in. SRT Reps.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Do vented seats make a big difference? ehorst Grand Cherokee - WK2 - 15 11-08-2010 04:22 PM
The difference in the 1st generation HEMI to the new 2nd generation HEMI White WK Swagga Grand Cherokee - WK 2 07-08-2010 11:16 AM
Difference in GC Hemi and Ram Hemi?? HemiDawg Grand Cherokee - WK 12 05-13-2010 11:52 AM
Adding these 3 mods at one make big difference? 05quadratrac Performance Modifications 3 12-05-2009 08:12 AM

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 12:09 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community

JeepGarage.org is in no way associated with or endorsed by Chrysler Group LLC.