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SEAN
Dodge Dakota
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8/18/2003
14:35:07
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 Subject: 2003 4.7 upgrades
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ok, how come i cant find any upgrades for the 2003 4.7??? have there been THAT many changes?? i was thinking of changing the gearing to 4.10's.... any concerns with the speedometer, i know it will need to be reprogrammed... but is it a major deal?
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Andrew
Dodge Dakota
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8/19/2003
01:33:03
|  RE: 2003 4.7 upgrades
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The only changes on the 2003 are the throttle body, and it can be modded as well as all the other parts.
Andrew
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Ian
Dodge Dakota
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8/19/2003
02:06:06
| RE: 2003 4.7 upgrades
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how exactly did they change the tb for '03
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SEAN
Dodge Dakota
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8/19/2003
09:07:14
| RE: 2003 4.7 upgrades
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i have e-mailed many parts manufacturers, and most say there mods will not work on 03's... hmmmm.
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Andrew
Dodge Dakota
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8/20/2003
02:27:17
|  RE: 2003 4.7 upgrades
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I talked to the "Fastman" when I ordered my 68mm awhile back and was asking him if there was a differenc between the 02 and 03, because it was listed as a different part number or option on his site. He said they changed the shape and location of some things on the 03, so I am going by what he said was different. I don't know what they changed on them though, I have a 02.
What are you looking to add on your truck Sean?
Andrew
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SEAN
Dodge Dakota
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8/20/2003
11:54:02
| RE: 2003 4.7 upgrades
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well, its fairly new... and havent really found anything for it yet. i am adding a ltd slip to it as my first change. was thinking of gearing... but i am a little hesitant, because noone can seem to tell me how big of a pain in the butt it is to get the computer reprogrammed to understand the change.... but, mostly, i think i would like to do either the jet chip or a programmer when available and then free up the exhaust a little.
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Andrew
Dodge Dakota
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8/20/2003
17:50:27
| RE: 2003 4.7 upgrades
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First, everything that works for the '02 will work for you, cams, intake, supercharger, Nitrous, ect. I wouldn't waste the money on a Jet chip, in the long run, you computer will not "learn" any gains off of it. Save the money for a real flash like the KennyBell, or even better the Hypertech if they ever release it.
I recall that a gear change doesen't change the spedo, it is a tire change that will mess it up. As far as exhust, it isn't model year dependant, you should be able to get what ever you want done with it now. Good luck,
Andrew
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SEAN
Dodge Dakota
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8/21/2003
09:57:46
| RE: 2003 4.7 upgrades
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thanks Andrew!!! this site has been awesome for info thanks !!!!
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Viking
Dodge Dakota
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8/21/2003
13:54:48
|  RE: 2003 4.7 upgrades
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I recall that a gear change doesen't change the spedo, it is a tire change that will mess it up.
You recall wrong...in layman's terms think of it this way. How many rotations of your drive shaft does it currently take to say go an indicate speed of 60. Add taller tires...less rotation so the speedo is indicating slower than you are going. Add steeper gears with all else being equal and your next effect is the same. For example, from 3.55 to 3.92 you will need a speedo correction to correct a speedo that "thinks" you are going faster than you are; i.e the drive shaft is making more revolutions per distance traveled than the 3.55. Common problem with trucks with big tires...typically need a gear change as well to maintain any sort of acceleration/performance..otherwise, your tires are inadvertantly changing your gear ratio.
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Snake
Dodge Dakota
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8/21/2003
14:29:15
| RE: 2003 4.7 upgrades
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I thought the speedo input was actually on the rear axel of the truck. If that's the case, then it doesn't matter what rear-end ratio you're running, so long as the axel turns the same rpm to the road.
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SEAN
Dodge Dakota
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8/21/2003
15:38:41
| RE: 2003 4.7 upgrades
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SO WHO IS RIGHT?
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silversport
Dodge Dakota
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8/21/2003
16:40:39
| RE: 2003 4.7 upgrades
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all the bolt on stuff i putt on my 2003 4.7 made the truck slower. air intake muffler duals plugs. do not mess with throttle body. dodge did good job on this motor.
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Viking
Dodge Dakota
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8/21/2003
17:01:48
| RE: 2003 4.7 upgrades
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Well, a speedo drive on the rear axle would be a first in my engineering book! For the most part these days, the speedo drive is an electric-magneto pick-up drive within the transmision that works in conjunction with the engine control computer that controls transmision shifts, cruise control, overdrive/lock-up convertor engagement, as well as a host of other engine functions (but you probably knew this already). Its not a simple old mechanical cable back up to the dashboard instrument cluster like days of old. Most aftermarket chips allow you to adjust this electronic signal (speedo calibrations) to take into account tire/gear combinations. I'd check with those developers in case you've got additional concerns.
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AndrewM
Dodge Dakota
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8/21/2003
17:05:04
| RE: 2003 4.7 upgrades
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Andrew is correct.
From the tech manual:
"The Wheel Speed Sensor (WSS) consists of a magnet surrounded by windings from a single strand of wire. The sensor sends a small AC signal to the CAB. This signal is generated by magnetic induction. The magnetic induction is created when a toothed sensor ring (exciter ring or tone wheel) passes the stationary magnetic WSS.
When the ring gear is rotated, the exciter ring passes the tip of the WSS. As the exciter ring tooth approaches the tip of the WSS, the magnetic lines of force expand, causing the magnetic field to cut across the sensor’s windings. This, in turn causes current to flow through the WSS circuit in one direction.
When the exciter ring tooth moves away from the sensor tip, the magnetic lines of force collapse
cutting the winding in the opposite direction. This causes the current to flow in the opposite direction.
Every time a tooth of the exciter ring passes the tip of the WSS, an AC signal is generated. Each AC signal (positive to negative signal or sinewave) is interpreted by the CAB. It then compares the frequency of the sinewave to a time value to calculate vehicle speed."
Therefore, changing the ring & pinion gears won't affect the calculation of the speed, since the exciter ring, which is bolted to the ring gear, doesn't change. However, changing tire sizes will, since the speedometer calculation has to take tire height into account.
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SEAN
Dodge Dakota
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8/21/2003
17:10:27
| RE: 2003 4.7 upgrades
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WOOOHOOO... 4.10'S IT IS THEN!!!! LOL.
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yates-in-DE
*GenIII*
8/21/2003
17:24:27
| RE: 2003 4.7 upgrades
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Silver Sport, the t-body on the 4.7L has a torque step that restricts it's flow, so porting and Polishing on the stocker is recomended or an after market t-body such as an F&B 70mm.
Depending on the intake & Exhaust purchased depends on performance. Putting true duals with Glass Packs increased my ET's by 3 tenths  I also have the Intense Performance Z-tube, and JBA Headers with a F&B 70mm T-body, and I also have the KenneBell Optimizer II, oh and don't forget the HO CAMS. My truck runs about 1.25 seconds faster than the other Dakotas that run my track stock.
SEAN, I would suggest similar items of performance that I have, the combos work great for the 4.7L. My truck which is a CC Sport Plus turns a 14.96@91.83 @ SL Conversion.
Later,
Lynn
 Clic the pic
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Demon Dakota
DakotaEnthusiast
8/21/2003
19:33:40
| RE: 2003 4.7 upgrades
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Your truck would run the same, if not better than mine if you ran at my lower alt Lynn. Come down from that huge plateau you live on...
K&N Drop in AF (CAI during summer months)
True Dual exhaust and removed third cat
HO Cams & HO Intake
FASTMAN 70mm TB
Autolite 3923 Plugs
TPS @ .76 VDC
IAT Adjuster Mod
14.52@94.2 MPH at Silver Dollar Raceway
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Andrew
Dodge Dakota
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8/22/2003
02:12:07
| RE: 2003 4.7 upgrades
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Hey Demon,
Did you do the 180 t-stat mod? I was wondering if you found any gain if you did? I am thinking about adding the IAT relocation mod and 180 t-stat to my list of mods soon since it is so cheap to do. Hope the header project it going well also.
Andrew
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Viking
Dodge Dakota
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8/22/2003
07:33:24
| RE: 2003 4.7 upgrades
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Well, a speedo drive on the rear axle would be a first in my engineering book! For the most part these days, the speedo drive is an electric-magneto pick-up drive within the transmision that works in conjunction with the engine control computer that controls transmision shifts, cruise control, overdrive/lock-up convertor engagement, as well as a host of other engine functions (but you probably knew this already). Its not a simple old mechanical cable back up to the dashboard instrument cluster like days of old. Most aftermarket chips allow you to adjust this electronic signal (speedo calibrations) to take into account tire/gear combinations. I'd check with those developers in case you've got additional concerns.
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viking
Dodge Dakota
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8/22/2003
08:12:19
| RE: 2003 4.7 upgrades
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AndrewM,
That is bizzare since my 2002 quad 5.9 DOESNOT utilize this with the 46RE transmisison...and prior to your post, I was not familiar with any manufacurer (big three mostly) that accomplished that...except for anti-lock applications on each wheel. I'd like to review the tech manual that you reference as it seems to be a good piece of gear...and I'd like to see the application(s) that they are referencing. Thanks for doing the research. Need more posters like you!
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AndrewM
Dodge Dakota
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8/22/2003
11:25:24
| RE: 2003 4.7 upgrades
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I've done some extensive reading through the 2002 tech manual that I have on CD. Here's what I've been able to determine:
• The rear wheel speed sensor (WSS) that I referred to in my previous post is part of the rear wheel anti-lock brake system. The Controller Antilock Brake (CAB) uses input from this sensor to detect impending wheel lockup to adjust brake pressure.
• Based on reviewing wiring diagrams and text regarding the instrument cluster and Powertrain Control Module (PCM), it appears that the rear WSS data that is provided to the CAB is also used as input to the PCM for vehicle speed.
• The tranny also has input and output speed sensors. These sensors appear to feed the Transmission Control Module (TCM) to determine tranny operation.
I might be wrong, but this is what I've come up with. I'm no mechanic, but I did stay at a Holiday Inn Express last night!
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Viking
Dodge Dakota
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8/22/2003
13:55:42
| RE: 2003 4.7 upgrades
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That's a great post concerning the Holiday Inn Stay !!! It would be intersting to see the functional relationship between the transmission sensors and the WSS/CAB...other than the obvious relationship between transmission output to rear wheel activity...i.e skidding/lockup. Good analysis and it would appear that the WSS and the speedo are related. I just don't know to what extent. By the way, I assume this post is you:
"Man, that really, really sucks. I'm glad I have a cousin who's a tech at a Dodge dealer that did my HO cam install". Is this your source for most of your research material or is it available in the public domain somewhere?? Thanks.
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AndrewM
Dodge Dakota
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8/22/2003
14:22:48
| RE: 2003 4.7 upgrades
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No, my cousin isn't real helpful other than turning wrenches! I bought the tech manual on CD off of Ebay for $20. It's a 65 mb PDF file. You can download it here if you like. This site and the tech manual have provided me with loads of information.
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