All 4.7s
All Star
Joined: Jan 2005
Posts: 852
Likes: 4
From: EULESS TEXAS DFW
SPEED SAFE, AIR RAM
Last edited by AIR RAM; Nov 19, 2008 at 12:04 AM.
All Star
Joined: Jan 2005
Posts: 852
Likes: 4
From: EULESS TEXAS DFW
Going from 3.55 gears to 4.56 gears gained me 3-4MPG@60MPH and a ton of off the line/towing performance. Hands down my favorite single mod.
Cold air induction system. Your factory induction system SUCKS in a bad way. Replacing it with one that flows freely will net you 10-12RWHP and approximately 2-3 MPG.
High flow "Y" pipe and single 3" exhaust system is what the 4.77L likes best... at least when making up to 300RWHP ball park. It responds real well to the single 3" CAT/MUFFLER.
70MM throttle body will tie in all the mods above allowing unrestricted air flow.
Headers would be one of the last mods on my list but it will be a great mod when done only after addressing the true restrictions of your exhaust system.. the factory crap "Y" pipe.
Tuner... this would be a great mod ANYTIME on the list.. Superchips is available for 1999-2007 4.7L and SCT is also available for those who want the best.
If you have any questions please feel free to contact me,
SPEED SAFE, AIR RAM
Champion
Joined: Aug 2005
Posts: 3,313
Likes: 8
Chrysler engineers have clearly come up with some good engine designs such as:
426 Hemi, slant six, 5.7 Hemi (and they selected the Cummins)
but
is the 4.7 a good design?
Has the 4.7 ever won a position in the Ward's Ten Best Engines competition?
Has Chrysler itself ever said that the 4.7 V8 is superior to other 3.7 to 4.8 L engines in terms of the commonly accepted BMEP or BSFC measures?
Did Chrysler ever publish a paper in the SAE Journal about how proud they were of new features in the 4.7 v8?
It is traditional to do this if you feel you have an innovative new engine. Chrysler did publish SAE papers on the 426, the 8L V10 and the 5.7 V8
Has the 4.7 v8 ever had either the best acceleration or best fuel economy in a comparison of either compact Dakota style pickups, or full size Ram style pickups?
(No)
Was the original 4.7 V8 design good, average, or 'nuthin to brag about' ?
If the original design was at least 'average',
why were there such LARGE gains
in Torque, Hp and BSFC on the 2008 re-design of the 4.7 ?
(which Chrysler officially says was done by the 5.7 team )
426 Hemi, slant six, 5.7 Hemi (and they selected the Cummins)
but
is the 4.7 a good design?
Has the 4.7 ever won a position in the Ward's Ten Best Engines competition?
Has Chrysler itself ever said that the 4.7 V8 is superior to other 3.7 to 4.8 L engines in terms of the commonly accepted BMEP or BSFC measures?
Did Chrysler ever publish a paper in the SAE Journal about how proud they were of new features in the 4.7 v8?
It is traditional to do this if you feel you have an innovative new engine. Chrysler did publish SAE papers on the 426, the 8L V10 and the 5.7 V8
Has the 4.7 v8 ever had either the best acceleration or best fuel economy in a comparison of either compact Dakota style pickups, or full size Ram style pickups?
(No)
Was the original 4.7 V8 design good, average, or 'nuthin to brag about' ?
If the original design was at least 'average',
why were there such LARGE gains
in Torque, Hp and BSFC on the 2008 re-design of the 4.7 ?
(which Chrysler officially says was done by the 5.7 team )
Record Breaker
Joined: Sep 2008
Posts: 1,676
Likes: 0
From: Damon, TEXAS!
I have read that the 2008 4.7 version is redesigned and better? Is this true? I know it puts out more horsepower thatn before. I have even seen it called the 'semi-hemi'.
And thanks AIR RAM, I do have a CAI and single exhaust system. I do not have a new Y pipe however. Who sells those for good prices? Sounds interesting. Anything to help the flow in and out.....Thanks for the info.
And thanks AIR RAM, I do have a CAI and single exhaust system. I do not have a new Y pipe however. Who sells those for good prices? Sounds interesting. Anything to help the flow in and out.....Thanks for the info.
Thread Starter
|
Professional
Joined: Mar 2008
Posts: 233
Likes: 0
From: NC
I have read that the 2008 4.7 version is redesigned and better? Is this true? I know it puts out more horsepower thatn before. I have even seen it called the 'semi-hemi'.
And thanks AIR RAM, I do have a CAI and single exhaust system. I do not have a new Y pipe however. Who sells those for good prices? Sounds interesting. Anything to help the flow in and out.....Thanks for the info.
And thanks AIR RAM, I do have a CAI and single exhaust system. I do not have a new Y pipe however. Who sells those for good prices? Sounds interesting. Anything to help the flow in and out.....Thanks for the info.
All Star
Joined: Jan 2005
Posts: 852
Likes: 4
From: EULESS TEXAS DFW
YES It is... your just not smart enough to know it because you have only owned your Jurassic 5.2L... Which the 4.7L replaced and coincidentally the 4.7L would it to shame in EVERY aspect.
SPEED SAFE, AIR RAM
SPEED SAFE, AIR RAM
Champion
Joined: Aug 2005
Posts: 3,313
Likes: 8
an old post,
that 4.7, 5.7 and 5.9 V8 owners might find interesting:
=====
Even before MDS was introduced on the 5.7V8
the unmodified EPA lab results were showing
that the 5.7 was within 4% of the 4.7 V8
in fuel efficiency.
The actual test results are available online from the EPA at:
http://www.epa.gov/fueleconomy/data.htm
to see the actual results go to this link:
http://www.epa.gov/otaq/tcldata.htm
These are not the 'Window Sticker' numbers,
these databases have the actual
city and highway test results down to a tenth of a mpg.
This makes it easier to compare.
These tests are done on Chrysler's own dynos
and an employee who is a Registered Professional Engineer
has to sign and stamp that the tests are done correctly
as it is a felony to lie to the EPA.
If you look at the 2003 year numbers
you can compare the
Magnum 5.9V8 to the Hemi 5.7V8 (without MDS back then)
and to the 4.7V8 and 3.7V6
all in Ram pickups
of nearly the same weight.
3.7V6 2wd had 25.4 MPG highway with 45RFE and 3.55 diff
4.7V8 2wd had 24.2 MPG highway with 45RFE and 3.55 diff
5.7V8 2wd had 23.3 MPG highway with 545RFE and 3.55 diff
5.9V8 2wd had 22.0 MPG highway with 47RE and 3.55 diff
Chrysler's official press release on the 5.7 Hemi said that it was 8-12% more
fuel efficient than the 10 year old Magnum 5.9V8 design. But notice
in the above that in the 2003 Ram pickup the 5.7 Hemi was only (23.3/22) 6%
more efficient at highway speed. This may be because the 545 automatic
transmission has more internal friction when in overdrive (where it has two
planetary gearsets turning) compared to the older 47RE auto that only had one
planetary gearset turning.
For comparing the 5.7 with MDS to the 4.7
look at the 2007 year numbers.
4.7V8 2wd had 23.7 MPG highway with 545RFE and 3.55 diff
5.7MDS 2wd had 25.4 MPG highway with 545RFE and 3.55 diff
Adding MDS to the 5.7V8 at a steady 55 mph improved it by
(25.4/23.3) or 9%
This matches what Chrysler said in their press release about MDS on the 5.7V8
where they wrote the most gains were below 60 mph, with maximum gain of 20%
around 45 mph.
that 4.7, 5.7 and 5.9 V8 owners might find interesting:
=====
Even before MDS was introduced on the 5.7V8
the unmodified EPA lab results were showing
that the 5.7 was within 4% of the 4.7 V8
in fuel efficiency.
The actual test results are available online from the EPA at:
http://www.epa.gov/fueleconomy/data.htm
to see the actual results go to this link:
http://www.epa.gov/otaq/tcldata.htm
These are not the 'Window Sticker' numbers,
these databases have the actual
city and highway test results down to a tenth of a mpg.
This makes it easier to compare.
These tests are done on Chrysler's own dynos
and an employee who is a Registered Professional Engineer
has to sign and stamp that the tests are done correctly
as it is a felony to lie to the EPA.
If you look at the 2003 year numbers
you can compare the
Magnum 5.9V8 to the Hemi 5.7V8 (without MDS back then)
and to the 4.7V8 and 3.7V6
all in Ram pickups
of nearly the same weight.
3.7V6 2wd had 25.4 MPG highway with 45RFE and 3.55 diff
4.7V8 2wd had 24.2 MPG highway with 45RFE and 3.55 diff
5.7V8 2wd had 23.3 MPG highway with 545RFE and 3.55 diff
5.9V8 2wd had 22.0 MPG highway with 47RE and 3.55 diff
Chrysler's official press release on the 5.7 Hemi said that it was 8-12% more
fuel efficient than the 10 year old Magnum 5.9V8 design. But notice
in the above that in the 2003 Ram pickup the 5.7 Hemi was only (23.3/22) 6%
more efficient at highway speed. This may be because the 545 automatic
transmission has more internal friction when in overdrive (where it has two
planetary gearsets turning) compared to the older 47RE auto that only had one
planetary gearset turning.
For comparing the 5.7 with MDS to the 4.7
look at the 2007 year numbers.
4.7V8 2wd had 23.7 MPG highway with 545RFE and 3.55 diff
5.7MDS 2wd had 25.4 MPG highway with 545RFE and 3.55 diff
Adding MDS to the 5.7V8 at a steady 55 mph improved it by
(25.4/23.3) or 9%
This matches what Chrysler said in their press release about MDS on the 5.7V8
where they wrote the most gains were below 60 mph, with maximum gain of 20%
around 45 mph.
