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loogout
Dodge Dakota
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7/18/2006
20:25:10
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 Subject: 3.9 vs. 4.7
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anyone know the hp difference between these two.
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GraphiteDak
GenIII
7/18/2006
23:48:35
| RE: 3.9 vs. 4.7
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Probably not a whole lot. The 4.7 is just rated at 230~235 HP. Torque is way better though.
But I'm sure once you try one over the 3.9 the butt dyno will tell you , you doubled HP :P
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ricardcapecod
Dodge Dakota
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7/19/2006
16:09:26
| RE: 3.9 vs. 4.7
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The 3.9 makes 175 hp.
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Loogout
Dodge Dakota
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7/20/2006
19:57:09
| RE: 3.9 vs. 4.7
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235hp is weak for a v8 Ford and GM have the 4.6 300hp and the 4.8 295hp Dodge needs to get on the ball.
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loogout
Dodge Dakota
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7/20/2006
22:27:45
| RE: 3.9 vs. 4.7
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I meant 3.7 not 3.9. Was really wondering how 210hp 3.7 stacks up against 235hp 4.7.
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GraphiteDak
GenIII
7/20/2006
22:43:24
| RE: 3.9 vs. 4.7
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Well that Chevy may be rated 295HP
But I DROVE a GM work truck with one. NO POWER until 4k RPMS!
And my 4.7 QC 4X4 BEFORE I did gears and LSD, beat a 4.8 chevy 2WD RC at the Speedworld raceway. The guy WORKED the lanes. (And that's the same raceway you see PINKS filmed at for many episodes.)
So that 295HP vs 235 sure is slanted LOL!!!
I had the HO cams by then. But it didn't make that much of a gain. Hardly anything.
The 4.8 makes more power up high. But the 4.7 torque comes on way earlier.
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02dak
Dodge Dakota
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8/02/2006
20:22:21
| RE: 3.9 vs. 4.7
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Yeah sure you did.
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2002 R/T
Dodge Dakota
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8/02/2006
21:09:45
| RE: 3.9 vs. 4.7
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haha try racing that 4.8 on the high way! oh and the 4.8 could use a tuner to remove the torque management. my friend has a 2003 4.8 extened cab with at k&n intake, gibson catback and a hypertech tuner and it is impresive. we ran a hemi on the highway one time and pulled the hemi about 2 trucks. the 4.8/5.3/LS1/LS6 all respond very well to bolt ons. and it seems that 4.7 guys always brag about there Daks when the race some one they beat that is mostly stock when you have several bolt ons.
2002 reg cab R/T
m1
52mm holley
K&N intake
mopar headers
1.7 rr
13.9@99
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GraphiteDak
GenIII
8/03/2006
01:36:54
| RE: 3.9 vs. 4.7
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I only had HO cams when I won. And I won by .1
But a win is a win and his was 2WD
From a roll the 4.8 seemed ok. It's just from a dead stop I thought it was pu$$y. Once my truck I drove was doing 30 it was pretty quick I thought.
When I drove the truck up some hills north of Pheonix, I also noticed it wouldn't grunt so well. If it downshifted it had plenty of power.
I think that intake must be tuned for higher revs. Which of course is why it has a higher HP rating too.
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GraphiteDak
GenIII
8/03/2006
01:43:28
| RE: 3.9 vs. 4.7
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I also beat every single Hemi and Titan to the 1/8 mile. That was with my 3.55 open diff with tires set at 15 to 20 PSI so I wouldn't rip them off silly. Or the ONE wheel anyway!
The 4.7 always seemed to have a good initial jump. It's the last part of the 1/4 that I get my a$$ handed to me.
Here's the video of me raicng the 2WD Chevy 1500 4.8 RC. His truck was a newer one. We raced a few times. He WORKED the staging lines at Speedworld. So you can't say he was a dipsh*t.
My tires were flattened to 15PSI to get a good start. You know that can't be helping once I get going though.
I thought that guy was going to kick my A$$. Because I thought the 4.8 i drove was pretty fast once it got into it's power. Seemed to pull harder than my truck. But maybe that's because it was so pu$$y from a dead stop.
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2002 R/T
Dodge Dakota
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8/03/2006
10:53:44
| RE: 3.9 vs. 4.7
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haha trustme if the 4.8 had a bigger cam it would pull hard on the topend. those things are detuned LS1's. oh yea and put a 4.8 5spd next 2 ur 4.7 and see what happens
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GraphiteDak
GenIII
8/03/2006
12:22:52
| RE: 3.9 vs. 4.7
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The 4.8 DOES pull hard on the top end.
A 5 speed behind the 4.8 truck would make a big diff because it would getinto that power band quicker and be gone.
In a car, the 4.8 would rock pretty good.
SO would a 4.7 but I think the 4.8 is already tuned at higher revs, the 4.7 for lower revs.
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toolfan
GenIII
8/03/2006
16:24:06
| RE: 3.9 vs. 4.7
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i haven't raced a 4.8 but i have raced the 5.3 in 3 different chevy trucks and my truck beats them more than they beat me.
Don't look so much at power ratings cause its all peak power.
here's the video to prove my point.
i race in the second one.
http://videos.streetfire.net/search/dakota/3/fb542a95-4a66-4769-a3c5-b47c1b26a867.htm
i have the 5.2L but the peak power is about the same.
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2002 R/T
Dodge Dakota
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8/04/2006
00:16:42
| RE: 3.9 vs. 4.7
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yea but if u wanted to make it more even put a rc 4.7 5spd vs. reg cab 4.8 5spd . the LSx motors respond very well to bolt ons. a stock 5.3 can put down about 250hp at the wheels. if i had to give up my R/T i would go with a reg cab silverado with the 4.8 stick.
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2002 R/T
Dodge Dakota
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8/04/2006
00:19:57
| RE: 3.9 vs. 4.7
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oh yea plus the 4.8/5.3 trucks are pretty about that torque managment. get that removed and ull see what they can do. i know from experiance. but i still love my R/T
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novaDAK
Dodge Dakota
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8/04/2006
21:30:56
| RE: 3.9 vs. 4.7
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I test drove about 5 4.7 4x4 Daks before I got my 5.2 4x4 Dak, and the 4.7s (without the DEATH flash) pulled hard off of the line and didn't lag all that much in the upper RPMS. I came across my 5.2 at a deal better than the 4.7s so that's what I got. I think it might be a tad quicker off the line but with the stock intake manifold I'm sure that the 4.7 would be better on the highway. Although I'd like to see that first person :). Anyways, the 5.2 would still hold it's own against a 4.7, it just has the power at a lower RPM compared to the 4.7.
About the Chevy's, I had 'raced' a reg cab silverado which had either the 4.8 or 5.3, and from about a 35mph roll mine downshifted and pulled hard, shifted, and when it got to about 3500-4500 I felt where the peak HP is at so I pulled ahead. We got up to about 55-60 when I backed off because we were in a 40 zone with a bend coming up.
Anyways, 4.7 5.2 5.9 doesn't matter, MOPAR V8's RULES!
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2002 R/T
Dodge Dakota
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8/04/2006
22:27:31
| RE: 3.9 vs. 4.7
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look at dragtruck.com and compare the 4.8/5.3 chevys to the mopars and the chevy have less bolt ons and they are quicker
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GraphiteDak
GenIII
8/05/2006
00:33:02
| RE: 3.9 vs. 4.7
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You must mean the trucks had actuall less bolt ons as tested. Because I know Chevy has much more AVAILABLE for their modular engines.
It's Dodge that has to make each engine option totally different form the other! 5.2 vs. 4.7 vs. 5.7, etc!
There really isn't jack sh*t for a 4.7
Boost is about the only real way to go these days as they are tuned fairly good out of the box for the small size. I don't know of any real "bolt ons" that work. Hanging a K&N air filter on a tube doesn't do jack sh*t. The programmer does a little, but mostly improves the shifts and puts the limiters way up there.
I looked for a 5.9 when I got my 2003 4X4. They just didn't have that engine in the trucks I liked. The 4.7 has been pretty good. And as Novadak says, without the deathflash it seemed to always snap right form the take off and pull fairly even through the powerband. No real peak ever noticed before or after mods.
My 4.8 Chevy truck i drove for a year never snapped from a dead stop or pulled any weight up hills at low RPM's. But it sure pulled hard at high RPM's. Clearly designed different as far as intakes and all that goes. The engines being nearly identical in displacement.
I think I'm better off with my 4.7 as towing has gone.
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2002 R/T
Dodge Dakota
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8/05/2006
14:16:41
| RE: 3.9 vs. 4.7
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was the chevy a stick shift like ur 4.7?
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GraphiteDak
GenIII
8/05/2006
16:38:43
| RE: 3.9 vs. 4.7
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Are you asking me or Novadak?
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toolfan
GenIII
8/05/2006
21:23:25
| RE: 3.9 vs. 4.7
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graphite has a automatic.
the chevy 4.8/5.3/6.0s have aluminum heads and a newer design. you can look at dragtimes and see they run good but the mopars are using 70s technology. look at chevys after market development, there is plenty of performance parts to choose from...
i still think mopar holds its own or has a lead on the competition.
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