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rockchuk
GenI
 
5/25/2008
09:43:51
|
 Subject: 3.9 V6 mods
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Message:
I just joined this site and it sounds like a lot of good info.
This one is for J and J auto
I have been doing a lot of research on Dodge 3.9 V6's. I just bought a 2002 Quad cab 4X4 Dakota with 65000 miles . Totally bone stock. 3.9 V6, 4sp auto, 3.55 gears, 265/70/16 tires.
I drive all around the Northwest with elevation changes from sea level to 4500 ft. I occasionally pull a 2500 boat also. Not all the time but enough that I would like to have some more power in 1500 to 3000 RPM range. I also don't want to loose the 70 mph at 2000 RPM. Empty I am getting around 19.5 MPG. I towed the boat 550 miles this weekend and had a loaded truck to boot. Maybe 3500 lbs total weight including the boat. Average MPG was 10.5. A lot of the hills were 2nd gear 50 mph and 3400 RPM.
I know that is a lot for a stock V6, but I am thinking if I had about 15 to 20% more hp and foot pounds of torque in the 1500 to 3000 range I would be very pleased with the truck. That is the only negative thing I have to say about the truck. I am not going to sell it because of the less power. I know that it is a stock V6. Reading what you have to say about these motors makes a lot of since and before I start throwing money at it. I thought I would see If you would respond.to this request. Money is an issue but if it is quality and works well I am not afraid to spend money. I will do all the work myself except if there is any machining of parts.
There is a couple of things I don't want to do to the motor. One is open it up if I don't have to. Two is I don't want it to be unreliable. Three I don't want it to be bastardize and that is why I turned to you. Based on what I have read I think you are knowledgeable and competent enough to give some good info.
If you respond to this Great and if you don't I understand. It sound like you get slammed with Questions. (One other thing is I want to get all the MPG I possibly can and I know how to keep my foot out of it)
Thanks
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not larry
Dodge Dakota
JOIN HERE
5/25/2008
11:26:45
|  RE: 3.9 V6 mods
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a cam or 1.7 roller rockers
CPS Mod adds to low end
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and
Dodge Dakota
JOIN HERE
5/25/2008
11:40:57
| RE: 3.9 V6 mods
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thats a heavy truck for the 3.9
at 19.5 your getting decent MPGs
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daddio
Dodge Dakota
JOIN HERE
5/25/2008
23:14:06
| RE: 3.9 V6 mods
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a 4x4 QC auto is enough of a challenge for the 3.9 without loading it down and towing. IMO, a superchips tuner and gears or smaller wheels & tires would be your best options. yes, you'll lose your 2k rpm @ 70 but, the truck will have more power.
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rockchuk
GenI
5/28/2008
18:37:03
| RE: 3.9 V6 mods
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Went over the mountain with 2 motorcycles in the back and got 16.2 mpg. That was driving 75 and 80. I guess I will review archives and make a decision on what to do. I would like to do one time. Thanks for all you guys help.
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daddio
Dodge Dakota
JOIN HERE
5/29/2008
09:01:30
| RE: 3.9 V6 mods
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Message:
i hope you don't expect to get great mileage driving 75 to 80 mph. these trucks have the aerodynamics of a brick! proper tire inflation, alignment and driving habits are major factors in the quest for better mileage.
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Larkin181
Dodge Dakota
JOIN HERE
5/29/2008
23:36:27
| RE: 3.9 V6 mods
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stupid question... whats an IMO and a CPS?
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nice1
Dodge Dakota
JOIN HERE
5/29/2008
23:58:50
| RE: 3.9 V6 mods
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Message:
IMO = "in my opinion"
CPS = "crankshaft positioning sensor"
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ccman
Dodge Dakota
JOIN HERE
5/30/2008
00:04:55
| RE: 3.9 V6 mods
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not to be a smart a$$ cause there's plenty of them on here, but a V8 would have probly been a better choice though i can't say you'd get the MPG. But if you make the changes you your V6 you probly won't get the MPG either but i don't know cause i've never done it. Gears would probly be most noticeable but you'll loose all the other stuff you like. You just got the truck so it's not like you can take it back and get a V8 but i'm just saying a V8 would have been better for what you need.
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what the??
Dodge Dakota
JOIN HERE
6/01/2008
22:18:50
| RE: 3.9 V6 mods
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Message:
you're bitchin about mpg at 75 or 80 mph. slow down a little and you'll see a big change!
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J and J Auto
GenII
6/03/2008
04:34:36
| RE: 3.9 V6 mods
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Message:
Ther are many things you can do
A 46mm fastman or 48mm F&B throttle body will
add 15 to 18hp and 20 25 torque at the wheels
around $250
A cold air intake system around 5hp
The harland sharp 1.7 roller rockers will just
about the same amount around $300
These rocker arms are a bolt in mod no adjusting
needed the valve cover gaskets are alm & silicon
and can be reused very good gaskets there
You also can move the crank sensor and gain 3 to 4
degrees of timing this will add around 5 to 10 hp
just remove remove rubber gromit slot the holes
and move down toward the oil filter right side
pass behind head hard to get to on the G3's
Another option after you improve the intake side
is a superchips tunner using the towing program
this will also raise and firm up your trans
shifting
A low restriction catback will add 5 to 10hp
headers another 10hp
Always improve the intake side first lowering the
back pressure without doing the intake you will
lose low end torque
All sythetic fluids will also help
All these mods not only increase power but also
help gas mileage
I just got 22.4 50 degrees out side raining out
half the trip freeway at 70mph in my 95 4x4
there is 30 hp gain and 40 torque at the wheels
this figuring the least gain
better spark plugs and wires will help napa
mo26 mo28 solid brass incerts and tylor or msd
wires will increase the volts at the plugs
go 1 colder
NGK Vpower $2.40ea FR5
E3 $6.00ea thing 3.64
halo $9each br15
the e3 and halo's are perm gap
the ngk gap at .040 on your obd2
The ngk you will notice instantly more power
smother and better mileage the e3 or halo's
even more
once all this is done than an MSD 6a multi
strike will ad anothe 10hp
with my stock cam I was dynoing aroud 198 RWHP
with my new cam 206
a stock truck is around 120 140rear wheel 200
torque
very easy boltons can get you upto 175 and 250
270 torque a very big improvement over stock
my 4x4 got 17 18mpg stock when its like 70 and
above temps I pull 24 25mpg
start with the
cold air intake
throttle body
1.7 rockers
give it 200 miles to learn this alone may be
enough
The baro sensor in the map sensor only reads when
key is turned on if you change elivation a lot
just pull over shut off and restart this will
solve the elivation prob the higher you get
the less atmispheric pressur and it will lose
power
almost forgot the bosch FMS fuel injectors with
the 4 hole spray over the factory 1 hole wonders
are matched closer holds a tighter air/fuel
ratio better atomization and over all smother
running motor very noticeable mid and top end
power gains more low end torque
Have fun
Larry
J&J Auto
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2649
Dodge Dakota
JOIN HERE
6/03/2008
22:31:45
| RE: 3.9 V6 mods
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Message:
Thanks for responding Larry. Haven't had time to really look at what you said. the weekend looks like a good time to make a game plan. I will start to whittle down the list and start a shoping list. Can't wait to get started!!
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jjj
Dodge Dakota
JOIN HERE
6/03/2008
23:45:36
| RE: 3.9 V6 mods
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Message:
" The baro sensor in the map sensor only reads when key is turned on if you change elivation a lot just pull over shut off and restart this will
solve the elivation prob the higher you get
the less atmispheric pressur and it will lose
power"
Larry, the baro also updates when you go WOT not only when on start.
Just an FYI for everyone.
Do the FMS injectors help mpg??
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rockchuk
GenI
6/06/2008
19:45:05
| RE: 3.9 V6 mods
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Is the part # for a 3.9 V6 superchips 3715 ?
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TuckerLdlow
Dodge Dakota
JOIN HERE
6/06/2008
21:20:03
| RE: 3.9 V6 mods
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3715 is the right number for the Superchips for your truck, Rockchuk.
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LMFAO
Dodge Dakota
JOIN HERE
6/06/2008
23:11:49
| RE: 3.9 V6 mods
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hey jjj your a real bright one i see
"if you change elivation"
ahahahahaha
Go back and finish the 4th grade!
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jjj
Dodge Dakota
JOIN HERE
6/07/2008
00:53:04
| RE: 3.9 V6 mods
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Talk about being bright -- notice the quotes on that section????
You are about as bright as a 1/4 watt bulb!! ROFLMAO
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LOL
Dodge Dakota
JOIN HERE
6/07/2008
21:42:48
| RE: 3.9 V6 mods
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Message:
wtf is elivation anyway?
looks to me like this jjj idiot is none other then the local village idiot
stan,shatto,sts, bill k
etc. etc. etc.
and hey Stan anal man them quotes looked ok to me
let us all know what you see their cup cake
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jjj
Dodge Dakota
JOIN HERE
6/07/2008
23:48:53
|  RE: 3.9 V6 mods
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Message:
You must really enjoy looking like an azz ROF
Really you should get a life, or maybe even a girlfriend - if you can find one that likes to hang out with a twit.
rockchuk probably the best bang for the buck would be going to 4.10 gears.
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yepp
Dodge Dakota
JOIN HERE
6/08/2008
21:58:34
| RE: 3.9 V6 mods
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Message:
jjj is none other the moron that called himself stan
a cupcake? na
he's more like a flaming dairy queen
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rockchuk
GenI
6/13/2008
12:40:19
| RE: 3.9 V6 mods
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Message:
I am looking at a throttle body on ebay. It is for a 2003 5.9 dakota. I was wondering if the cfm would be to much and do you think the cable attachment would be the same as an 2002 3.9?
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