Towing RPM
Record Breaker
Joined: Nov 2009
Posts: 1,077
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From: Austin, TX
you can't get 4.10's on a 1500 model, i don't think so at least
It's an option on some models, the Sport or R/T I think.
it's 3.92's with LSD.... are you using the ERS on the shifter? elec range select?
May I ask what you think that will improve?
Passing, climbing a hill maybe but it doesn't do squat for steady state cruising.
It's an option on some models, the Sport or R/T I think.
it's 3.92's with LSD.... are you using the ERS on the shifter? elec range select?
May I ask what you think that will improve?
Passing, climbing a hill maybe but it doesn't do squat for steady state cruising.
Champion
Joined: Dec 2007
Posts: 3,563
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From: Ontario, Canada
I used to have a 79 chevy van that I loaded with the Detroit News on Mound and 16 mile in Michigan and brought them to Canada. It would be to the roof, sitting on all bump stops, brakes cooking but I did it daily, drove 60 mph probably 4000 rpm's or more LOL. This was a 5.7 l chevy with 180 HP maybe less. I think we are getting wimpy, all I did was throw in some helper leafs and air shocks, Tranny cooler too after the third tranny, doubled the life of them. Parts were cheaper back then but still we made our stuff work, I actually warped my axle tubes after one load...lucky I made it home, it was humming good.
Professional
Joined: Feb 2010
Posts: 143
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From: SoCal
That is exactly what we are bitching about.
In a TRUCK, a 5.7 oughta put out better than a 4.7 in the 2200rpm and below range.
IT DOES NOT. IT PUTS OUT LESS.
The low end torque and HP are sacrificed for drivers that want to boast about going 140mph or clocking a 13 second 1/4 mile.
In a TRUCK, a 5.7 oughta put out better than a 4.7 in the 2200rpm and below range.
IT DOES NOT. IT PUTS OUT LESS.
The low end torque and HP are sacrificed for drivers that want to boast about going 140mph or clocking a 13 second 1/4 mile.
The reason it has such crappy power at that RPM is they tuned it for gas mileage, so when you cruise with an empty truck your MPG is great but when you haul stuff the engine revs up to make power.
There's torque limiting too.
If you're so pissed about it go buy a superchips tuner. It'll probably really boost your bottom end not to mention make a huge difference when they finally figure out how to remove torque limiting.
Rookie
Joined: Mar 2009
Posts: 69
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From: Upstate NY
Are you serious that the 4.7 is stronger at 2200 rpm than the new VVT hemi? My '03 Dakota with the 4.7 manual wouldn't run at all below about 2200-2300 RPM when under load. Granted there is the new HO FFV engine (which I haven't driven unfortunately), but from the two guys I talk to (shop foreman and salesman), they said that newer 4.7 is even more RPM finicky and is all top end power.
Record Breaker
Joined: Nov 2009
Posts: 1,077
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From: Austin, TX
Are you serious that the 4.7 is stronger at 2200 rpm than the new VVT hemi? Granted there is the new HO FFV engine (which I haven't driven unfortunately), but from the two guys I talk to (shop foreman and salesman), they said that newer 4.7 is even more RPM finicky and is all top end power.
Record Breaker
Joined: Nov 2009
Posts: 1,077
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From: Austin, TX
The tuner does little or nothing for part throttle performance. Economy? Yes some improvement. WOT? yes, but neither engine really needed improvement in that area for mid weights.
I'm anxious to try the tranny adjustments when they are released. Hoping for delayed downshifts when slight throttle adjustments are needed in the 55-70mph range. As it stands now the 5.7 downshift's 2 Gears as soon as it encounters a little overpass.
Record Breaker
Joined: Jan 2010
Posts: 1,400
Likes: 5
From: San Pedro, California
real power plots for hemi
Here is a link for a PDF of the 2009 Ram sales brochure with the correct power plots for the hemi on page 9. The numbers that 05DAKOTA is using are wrong. The Dodge website picture does not make sense. If you look at it closely, not only do the HP and Torque curves not cross at 5220, the peak torque figure is not 407.Attachment 8386
http://pa.motorwebs.com/dodge/pdf/ram.pdf
http://pa.motorwebs.com/dodge/pdf/ram.pdf
Last edited by Pedro Dog; Jul 29, 2010 at 08:02 PM.
Record Breaker
Joined: Jan 2010
Posts: 1,400
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From: San Pedro, California
Rookie
Joined: Jan 2009
Posts: 87
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From: harrison, ar
The 4.7 HO was a decent lo to mid rpm engine, in my 07 Dakota 4x4 with 3.92s. No mater how low it was, it wasn't enough for a 4700 pound plus truck. If I'd have kept it, the tires woulda been replaced to make it run the same rpm as 4.10s would have produced. Heavy stuff, and getting heavier.