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SSG H.
Dodge Dakota
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8/15/2007
00:57:59
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 Subject: Hop up 2000 4.7L 4x4
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I know that this is probably going to get me booed but, I have a 2000 4.7L 4x4 Dakota. I have mod it slightly, I removed the restrictive air system, filter box, and replaced it with a new filter, and 4" intake tube from the filter to the TB. I would like to know what the best TB is and what parts will give me the most horse power gains. What is the difference between a 4.7 and 4.7 HO? Will the 4.7 HO cam and man work on my truck?
Thank you.
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Shoe
GenIII
8/15/2007
04:19:28
|  RE: Hop up 2000 4.7L 4x4
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The 70mm throttle body will do just fine. Yes, you can swap the HO cams and manifold with your truck. A lot of people do it and are pleased.
Finally... a V8. '01 Dodge Dakota RC, 4.7, 5-speed, 3.92 LSD. = R/T Killer.
well at least a stock one
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Kowalski
GenIII
8/15/2007
16:51:43
| RE: Hop up 2000 4.7L 4x4
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I have the same truck - the HO cams will work fine, reputed to give you most of the torque gain of the whole HO package. I noticed the improvement. The HO also has more ignition advance, we can do that with superchips or a custom flash. That helped too.
You're kidding yourself about the restrictive intake though - it took K&N some time and testing to develope a replacement that would dyno more power - and that is pretty much all at the upper revs. I'm sure it sounds good though.
There are lots of other differences too, but those are the most important and easiest for us to change. The '00 4.7 was the only Dakota with the 65mm TB, others got a 68mm. I swapped to a ported 68mm; but the 70mm is a good suggestion. Rather than one size being best, it's important that mods work well together. These mods would all work well together, and a little freer flowing exhaust could complement those changes - but I'd change that stuff before the exhaust. Won't see as much gain from exhaust alone. The y-pipe is the bottleneck in the system.
Lead, follow, or get out of the way
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SSG H.
Dodge Dakota
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8/16/2007
00:00:53
| RE: Hop up 2000 4.7L 4x4
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Kowalski,
I understand that the air intake I have is not a K&N, but it has to help taking off all that plastic junk.
My planned mods,
Header back custom Flow Master exhaust
HO Cam
HO Manifold
70mm Throttle Body
Superchip Tuner
Does anyone make replacement Cylinder heads or is it better to port and polish stock?
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Shoe
GenIII
8/16/2007
14:46:49
| RE: Hop up 2000 4.7L 4x4
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KRC sells fully ported 4.7 heads. www.krcperformance.com
Finally... a V8. '01 Dodge Dakota RC, 4.7, 5-speed, 3.92 LSD. = R/T Killer.
well at least a stock one
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Kowalski
GenIII
8/16/2007
17:16:58
| RE: Hop up 2000 4.7L 4x4
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Did you dyno before and after ? Not sure why you think that has to help - those who dynoed found home brew set up didn't do much; and if you are now pulling warm air from under the hood, it may even make it worse. Your planned mods look good.
Lead, follow, or get out of the way
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SSG H.
Dodge Dakota
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8/16/2007
23:32:36
| RE: Hop up 2000 4.7L 4x4
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Kowalski,
No I didn't Dyno, I just got bored one day and decided to build a 4" intake system. It could be that it is drawing warm air and not working but neither was the old restrictive stock junk. I set it up so air passing between the radiator and the headlight blows at the filter. I have noticed a different feel in the responsiveness and a very large difference in engine sound, it is much more of a growl, even guys I work with can hear a big difference.
K&N setups give 10 to 20 horse, I would bank that my setup at least helped to free and flow CFM. The two main differences between my setup and a K&N is my system is 4" diameter tube from filter to TB, a K&N is 3.25 to 3.5 and my filter breathes 360, a K&N has a plastic shield around part of it.
K&N has millions to spend on R&D I just looked at theirs and copied it with adjustments.
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DSW
Dodge Dakota
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8/17/2007
01:37:57
| RE: Hop up 2000 4.7L 4x4
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They use plastic in the intake system because it insulates the incoming air better than metal. K&N's do make additional power, but not much when you look at their dyno charts, no improvement up to 3200RPM and maxes at 8HP at 4500RPM. The stock air filter system isn't all that bad, but the oddly shaped design of the air hat and sound canceling chamber seems to hamper good air flow, probably where K&N sees most of it's gains at higher RPM.
If the intake air isn't being drawn from outside the engine bay, any improvement in ducting could be lost by drawing in hot air,,, or worse you could loose power because of drawing in hot air. Taking off the rubber flap by the headlight won't cut it, you need to isolate the filter's incoming air from the engine bay. On my 03 Dak I did a complete homebrew out of 3" ABS and an aluminum heatshield which isolates the filter from engine temps, it draws air from the removed rubber flap by the headlight. I kept the stock filter system on my 01 Durango and replaced the restrictive air hat with an ABS fitting, air is drawn through the fender via a duct in the fender by the headlight. I didn't notice any difference between the 2 setups,,, besides the complete home brew setup noise getting annoying after the novelty of the growling sound wore off.
I did several things on my Durango this week, replaced air hat, installed a Magnaflow muffler, Superchips, HO Cams. The Superchips and HO cams made good gains, the air hat and muffler were marginal,,, but every bit helps ;-)
Your mods look good, but the HO manifold will move the power band up about 300RPM, not good for towing.
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Kowalski
GenIII
8/17/2007
15:30:15
|  RE: Hop up 2000 4.7L 4x4
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Yup - the so called "restrictive stock junk" is not easy to improve on for the 4.7. K&N numbers posted by SSG H. are total B.S. for that motor. Removing the noise canceling box will make it sound like it has more power, for you guys who just want something that sounds quick...
Lead, follow, or get out of the way
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SSG H.
Dodge Dakota
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8/17/2007
18:21:40
| RE: Hop up 2000 4.7L 4x4
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Ok, I apologize 10 to 20 was an exaggeration but it was for K&N. I did in no way say any numbers for my system. The only thing said was CFM which can't be argued, a bigger filter and a bigger diameter on the intake hose equals the ability for freer flow of air whether its supper heated or almost liquid.
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Kowalski
GenIII
8/18/2007
07:37:18
| RE: Hop up 2000 4.7L 4x4
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Actually, CFM can be argued. Intakes can be tuned for a particular application; just like exhaust. We understood your exaggeration was for the K&N, that's why I pointed it out...
Lead, follow, or get out of the way
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yeah
Dodge Dakota
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8/18/2007
08:21:29
| RE: Hop up 2000 4.7L 4x4
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He's already acknowledge his mod might not be making more power, I wonder why SSGH is still harping on this ? I hope he realizes even if he is flowing more hot air, it could contain less oxygen to combine with the fuel than a smaller volume of cold air. As we've seen before, some just can't let go of the idea that once they've spent money or put work into a mod, it must be an improvement. Not always.
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McRunnel
Dodge Dakota
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5/30/2012
10:15:24
| RE: Hop up 2000 4.7L 4x4
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Sorry to bring this back to life but have a quick question. I was
thinking about modifying the hat on the 4.7L to have the filter in
there and then make some type of modification to my hood that I
have on my 2000 dakota QC to have the air come in the scoop and
then directly into the throttle body. Has anyone seen this done at
all? and have any gains been had by this?
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daddio
Dodge Dakota
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6/01/2012
07:13:25
| RE: Hop up 2000 4.7L 4x4
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Haven't seen that done but I do not see anything gained from it unless it was sealed to keep underhood air out of it.
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