serious power adders for the 4.7?
#41
05-17-2010, 11:17 PM
Originally Posted by jmr;
Being a 2008 4.7 RAM owner I'm curious what specifically changed in 2008 to gain 75HP?
What was tweaked with the heads and what are the port flow numbers? Anybody know if the cam or intake/exhaust manifolds have changed?
For six years I owned a 2002 Dakota 2WD QC with the 4.7 and 3.55 gears and it ran pretty good but this 08 engine really cranks.
I did read something interesting on another forum. The member stated that he actually talked to a powertrain engineer and was told that the revised 4.7 PCM detunes power output by 10%. Hmmm maybe a Mopar Stage 1 PCM is in the works....another 10% would be in Hemi territory.
What was tweaked with the heads and what are the port flow numbers? Anybody know if the cam or intake/exhaust manifolds have changed?
For six years I owned a 2002 Dakota 2WD QC with the 4.7 and 3.55 gears and it ran pretty good but this 08 engine really cranks.
I did read something interesting on another forum. The member stated that he actually talked to a powertrain engineer and was told that the revised 4.7 PCM detunes power output by 10%. Hmmm maybe a Mopar Stage 1 PCM is in the works....another 10% would be in Hemi territory.
Last edited by davb673; 05-17-2010 at 11:25 PM. Reason: converter
#42
05-17-2010, 11:19 PM
I have run both and would have to side with the JBA headers... I can get you either set... but from the sets I have seen the JBA where of better quality.
Also, I would not add headers until you have addressed the true restrictions of your exhaust system.
Your factory "Y" pipe is the single greatest restriction in the system. Make sure you address that with a HIGH FLOW "Y" pipe. I would go from the factory primary tubes (2.25") to the "Y" and merge that into a SINGLE 3" system useing a SINGLE 3" CAT & HIGH FLOW MUFFLER. After you have completed that set up you will be ready for headers. But until then your headers will only flow as much as your greatest restriction will allow. This is why some people claim headers don't work on the 4.7L... because they never address the greater restrictions in the system first.
SPEED SAFE, AIR RAM
Also, I would not add headers until you have addressed the true restrictions of your exhaust system.
Your factory "Y" pipe is the single greatest restriction in the system. Make sure you address that with a HIGH FLOW "Y" pipe. I would go from the factory primary tubes (2.25") to the "Y" and merge that into a SINGLE 3" system useing a SINGLE 3" CAT & HIGH FLOW MUFFLER. After you have completed that set up you will be ready for headers. But until then your headers will only flow as much as your greatest restriction will allow. This is why some people claim headers don't work on the 4.7L... because they never address the greater restrictions in the system first.
SPEED SAFE, AIR RAM
Thanks Nick. I am also considering headers, but after I swap the muffler out. I'll have to remember JBAs.
Last edited by davb673; 05-17-2010 at 11:21 PM. Reason: thanks
#43
05-17-2010, 11:49 PM
i have an 07 qc with the 4.7 and im on the hunt for some more power ive thought about the 5.7 or 6.1 swap but i dont have to get to crazy i would like to get some 08 semi hemi heads and ecm flash along with full exhaust i just cant find any where to get those nor do i know what all goes into changing to those heads if any of you guys in the know could pass on some of that info id greatly appreciate it
well worth the money
#44
04-14-2015, 07:51 PM
08" Ram 4.7
Being a 2008 4.7 RAM owner I'm curious what specifically changed in 2008 to gain 75HP?
What was tweaked with the heads and what are the port flow numbers? Anybody know if the cam or intake/exhaust manifolds have changed?
For six years I owned a 2002 Dakota 2WD QC with the 4.7 and 3.55 gears and it ran pretty good but this 08 engine really cranks.
I did read something interesting on another forum. The member stated that he actually talked to a powertrain engineer and was told that the revised 4.7 PCM detunes power output by 10%. Hmmm maybe a Mopar Stage 1 PCM is in the works....another 10% would be in Hemi territory.
What was tweaked with the heads and what are the port flow numbers? Anybody know if the cam or intake/exhaust manifolds have changed?
For six years I owned a 2002 Dakota 2WD QC with the 4.7 and 3.55 gears and it ran pretty good but this 08 engine really cranks.
I did read something interesting on another forum. The member stated that he actually talked to a powertrain engineer and was told that the revised 4.7 PCM detunes power output by 10%. Hmmm maybe a Mopar Stage 1 PCM is in the works....another 10% would be in Hemi territory.
