mileage with the 4.7
#21
03-13-2008, 01:09 AM
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RE: mileage with the 4.7
i have an 03 4.7L and on the counsel it says i get 10.9 but i think somethings wrong with it because when i do the conversion from miles to tank fill up after the math i get 14.5 city mpg. So manually it cant lie 14.5MPG's
As for performance.. its not really a "performance" engine. I have 3" dual flow masters, a cold air intake and a JET super chip not including no tailgate cover yet and trust me.. its definitetly a ricer eater. I've destroyed every honda si ive raced. Must feel like **** for them to get smoked buy a heavy *** 4.7 l truck in a little SI lmao.
As for performance.. its not really a "performance" engine. I have 3" dual flow masters, a cold air intake and a JET super chip not including no tailgate cover yet and trust me.. its definitetly a ricer eater. I've destroyed every honda si ive raced. Must feel like **** for them to get smoked buy a heavy *** 4.7 l truck in a little SI lmao.
#22
03-13-2008, 08:09 AM
RE: mileage with the 4.7
below is an old post with more info on the subject of
5.7 vs 5.7MDS vs 4.7 vs 5.9
fuel economy
using the 'raw data' from the EPA tests
that you don't normally see...the sticker has rounded off MPG numbers.
---------------
At least this month (Jan 2007)
Chrysler has been offering the 5.7V8 with MDS as a
"no cost upgrade"
over the 4.7 on Rams
and pointing out to customers that
the 5.7MDS has better EPA MPG test results by about 1.
When evaluating this, keep in mind that you are comparing a 5.7V8 running on 4
cylinders (and dragging along 4 not being used) at a speed of 55 mph to a
4.7V8 running on eight cylinders also at a speed of 55 mph.
At speeds of 70-79 mph the MDS on the 5.7 Ram will not kick in unless you are
going downhill, or have a wind at your back. Here at higher speeds the 4.7
might regain an MPG edge.
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. Since 1985 EPA has applied a
'fudge factor' to these actual results to get the number that you see on the
Window Sticker. This happened because citizens complained the EPA city and
highway numbers were TOO HIGH compared to 'normal driving'. Next year EPA
will apply an even greater 'fudge factor' because citizens are still
complaining that they can't get at 79 mph the MPG that EPA measures at 55 mph.
If you look at the 2003 year numbers
you can compare the Magnum
5.9V8 to the 5.7V8 (without MDS back then)
and to the 4.7V8 and 3.7V6
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.
Usually when they say this is means the 5.7 is 8% more efficient at max torque
and 12% more efficient at max horsepower.
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.
2wd 5.7 Rams will be able to go a little faster in MDS mode and get better MPG
than 4wd Rams because the extra driveline friction and weight of the front
axle loads the engine down more.
=======
Torque in the important 1500-2500 rpm range
is much greater on the Magnum 5.9V8 than on the 4.7V8
See these rear wheel dyno curves
and look at the 'stock' torque numbers for each engine:
for the 5.9
http://www.hypertech-inc.com/dynodgtrk.html
for the 4.7
http://superchips.com/~superchips/prod_imgs/makepdf-822.pdf
5.7 vs 5.7MDS vs 4.7 vs 5.9
fuel economy
using the 'raw data' from the EPA tests
that you don't normally see...the sticker has rounded off MPG numbers.
---------------
At least this month (Jan 2007)
Chrysler has been offering the 5.7V8 with MDS as a
"no cost upgrade"
over the 4.7 on Rams
and pointing out to customers that
the 5.7MDS has better EPA MPG test results by about 1.
When evaluating this, keep in mind that you are comparing a 5.7V8 running on 4
cylinders (and dragging along 4 not being used) at a speed of 55 mph to a
4.7V8 running on eight cylinders also at a speed of 55 mph.
At speeds of 70-79 mph the MDS on the 5.7 Ram will not kick in unless you are
going downhill, or have a wind at your back. Here at higher speeds the 4.7
might regain an MPG edge.
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. Since 1985 EPA has applied a
'fudge factor' to these actual results to get the number that you see on the
Window Sticker. This happened because citizens complained the EPA city and
highway numbers were TOO HIGH compared to 'normal driving'. Next year EPA
will apply an even greater 'fudge factor' because citizens are still
complaining that they can't get at 79 mph the MPG that EPA measures at 55 mph.
If you look at the 2003 year numbers
you can compare the Magnum
5.9V8 to the 5.7V8 (without MDS back then)
and to the 4.7V8 and 3.7V6
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.
Usually when they say this is means the 5.7 is 8% more efficient at max torque
and 12% more efficient at max horsepower.
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.
2wd 5.7 Rams will be able to go a little faster in MDS mode and get better MPG
than 4wd Rams because the extra driveline friction and weight of the front
axle loads the engine down more.
=======
Torque in the important 1500-2500 rpm range
is much greater on the Magnum 5.9V8 than on the 4.7V8
See these rear wheel dyno curves
and look at the 'stock' torque numbers for each engine:
for the 5.9
http://www.hypertech-inc.com/dynodgtrk.html
for the 4.7
http://superchips.com/~superchips/prod_imgs/makepdf-822.pdf
#23
03-13-2008, 01:07 PM
#24
03-13-2008, 02:25 PM
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RE: mileage with the 4.7
I do some running for my job and every time i start out on a trip that I know is going to be more than 20 or so miles I will reset my wonderful average mpg meter on the control center. Yesterday I had a 45 mile trip and got 18 all city. Also if I stay around 70 on interstate i can get about 20. For me the power is great because I used to drive a neuron. For sale by the way if anyone wants it.