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legendracer97
Dodge Dakota
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3/07/2007
01:29:01

Subject: 3.9 Suggested Mods?
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Okay i have the 3.9 on my 2001 dakota sport and have a cold air intake, jet chip stage one, throttle body spacer. What should i do next for performance? Im leaning towards exhaust, or injectors, about the same price... Ive heard of someone putting an r/t throttle body on a 3.9 for power.. does this work or was he jsut b/s'n me?? Thanks



J and J Auto
GenII
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3/07/2007
02:34:40

RE: 3.9 Suggested Mods?
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You have the cold air now

A v8 throttle body 96 to 03 non egr type will
bolt right on, mid and top gains 15 to 18hp
20 25 torque at the wheels around $100 you
may also have to swap the cable if linkage is diff

Or
fastman 46mm $250
f&b 48mm $380
These offer off idle to redline gains the same
peak gains but better off idle low end response
over the V8 swap

V8 good any 318 360 96 and up your V6
sensors and cable braket will all bolt on
a new V8 body from chrysler is around $190
all your V6 sensors and cable bracket will
bolt right on

now do the 1.7 roller rockers harland sharp
aroud $300

these 2 mods is a good place to start and will
net 30 plus hp at the wheels and better gas
mileage

relocate the IAT 6" from throttle body this
will drop the reading from 180 200 degrees to
around 90 to 120 will give you more timing
and fuel

crank sensor mod another 3 to 4 degrees advance

good plugs 1 range colder
NGK FR5 gap .040 on your obd2

next superchips 3715 tunner

after the intake side is improved think headers
and a cat back system

dump the stage 1 jet with the tunner

now improve the ignition
MSD 6a box
MSD 8207 coil
MSD 8.5 wires same year 5.2 perfict fit
once the ign is on open the FR5's to .055 gap

Also on your obd2 you will need the tach adapter
or it will throw coil circuit codes

Now your cooking just be sure your o2's are
working good or none of these mods will show
any gains
ngk.com for the o2's if in doubt replace them
they are the most important sensors

Oh almost forgot throttle position sensor
center wire and ground set at .7 .75 volts
this will help throttle response and trans
reaction

start doing these mods when they are all done
they compliment each other and run very well

don't do the exhaust first you will lose low
end torque
have fun
fastman better
f&b best

Larry
J&J Auto

ryan
Dodge Dakota
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3/07/2007
02:54:17

RE: 3.9 Suggested Mods?
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larry if someone were to do all those mods, what kind of hp and tq would you see at the wheels?



J and J Auto
GenII
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3/07/2007
03:23:31

RE: 3.9 Suggested Mods?
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most truck average 120 140 at the wheels

doing all the mods making sure all sensors are up
to snuff you can get the V6 upto 175hp and about
280 torque

most when done right
hp gain 50 to 60
torque 60 to 80 foot pounds at the wheels

now if you gasket match the intake remove the devider and shorten the runners to 14" another
15hp gain

180 190 rear wheel
that is a very respectable gain and very
noticeable and the gas mileage will go up also

the comp upgrades like the superchips will add
more torque and hp in the low and mid range
2500 to 4000 peak hp around 5 to 10 but the
low and mid gains are nice

On the obd1 the V6 performance comp besides the
low end and mid gains will peak around 10 to 12
hp on a moded motor with a head port clean added
15 to 18 peak around 4200 to 4600rpm

I just poped a little over 200 rear wheel all the
mods and boltons stock cam with 1.7's and the
head port clean and polish

almost forgot you will need a good set of injectors and a min fuel presure of 45psi I am
running 50psi

The FMS injectors are matched closer and will flow
more in the mid and top end better atomization
overall smother running motor and better gas
milege over the factory 1 hole wonders poorly
matched makes it hard for the comp to tune in
and hold a decient air/fuel ratio this is where
most lose gas mileage and peak performance

when and if you do the head port clean up you can
also get them milled .020 up the comp to almost
9.5 over the stock 9.2

doing all this to the V6 will make anyone smile
when they get on it or getting 20mpg plus while
crusing

Its there just needs to be setup and tuned right

Larry
J&J Auto

J and J Auto
GenII
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3/07/2007
03:38:08

RE: 3.9 Suggested Mods?
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This does include having the headers and a good
high flow cat and low restriction exhaust

not the biggest you can find you do need to maintain some back pressure

Now here is the key

doing all this will help but for peak perf you
need to have a good air/fuel ratio and you don't
need anything special to check this

When the plugs are running a nice tan color you
are right on the money no if ands or buts your
there

The dyno numbers I speak of here are O/D off
3rd gear lockup the o/d is a .69 to 1 ratio
3rd is 1 to 1 ratio

Thats the secret here good injectors matched well
holding a good air/fuel ratio and all cyls
running equal

not 1 lean 1 rich a couple just right with the tan
color all must be almost identical in the tan
color on the center insulter of the plug

Than your running efficient and will get peak
power torque and gas mileage and have a lot more
fun driving your truck

Larry
J&J Auto

2low
Dodge Dakota
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3/07/2007
07:18:24

RE: 3.9 Suggested Mods?
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If all of theese mods are done is it safe to supercharge the engine? If not what else would need to be done?



legendracer97
Dodge Dakota
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3/07/2007
11:51:23

RE: 3.9 Suggested Mods?
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Whats the best throttle body for the money? I think i'll go there next... thanks man



legendracer97
Dodge Dakota
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3/07/2007
12:09:47

RE: 3.9 Suggested Mods?
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Should i take off the tb spacer before i put on the throttle body? probably im guessing



Gears
Dodge Dakota
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3/07/2007
13:35:49

RE: 3.9 Suggested Mods?
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The Tb Spacer is a good paper weight. They really aren't worth anything on the 3.9's



daddio
Dodge Dakota
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3/07/2007
13:48:32

RE: 3.9 Suggested Mods?
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you don't have to remove the spacer. it's just not doing anything to hurt or help anyway.



Gears
Dodge Dakota
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3/07/2007
13:51:27

RE: 3.9 Suggested Mods?
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2low
If you are gonna supercharge, you can't use the mods that advance your timing - IAT relocted, Crank sensor mod, or the jet chip/or super tuner. Turbo or supercharging require the timing to be retarded.
......Gears



Fed
GenIII
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3/07/2007
14:41:09

RE: 3.9 Suggested Mods?
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the best throttle body for the money is either the fastman 46mm or the V8 body...

1999 Dakota CC SLT 5.2 auto
(air intake, 3" magnaflow exhaust)

legendracer97
Dodge Dakota
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3/07/2007
15:08:50

RE: 3.9 Suggested Mods?
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How hard is it to install the msd 6a froma distrubor sys? Seems like it could get complicated to me... thanks



Trev1
Dodge Dakota
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3/07/2007
18:57:15

RE: 3.9 Suggested Mods?
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Will these mods work for a 92 dak 3.9 v6? What is the IAT6"? Thanks...



legendracer97
Dodge Dakota
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3/07/2007
21:09:50

RE: 3.9 Suggested Mods?
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what set of msd wires should i get? Okay i got the MSD 6A Box, Blaster Coil 8207 ordered, but is there a certain part number for the plug wires? Thanks



boomer
Dodge Dakota
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3/08/2007
18:20:32

RE: 3.9 Suggested Mods?
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larry is the man if you all havnt noticed. I'm keepin my eye on this post. I'm slowly workin on my 98 2wd slt.

cold air intake
jba headers (should have did intake side first)
umm, "highflow cat"
flowmaster 40 series deltaflow (sounds great..under 2500 rpm)
cant think of the rest right now



J and J Auto
GenII
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3/09/2007
04:07:49

RE: 3.9 Suggested Mods?
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If you super charge you want all the flow you
can get for max gain
1.7's
portmatch
head clean
devider and shortend runners
headers high flow & cat back system
the more flow you have the more gain you get with
a forced air induction

We are running the s/c's with the crank sensor
mod but here all motors react a little diff some
will run with the boost retard at 0 no retard
some need 1 or 2 degrees or they ping also the
IAT relocat is done on all the s/c setups it
not only adds timing but more fuel as well we have
them running with jet chips and superchips tunners
if you get ping you need a boost retard control
so it backs off timing when it comes under boost

throttle bodies
V8 good mid and top end gains off idle low end
will remain the same some will even show a loss
do not mod in any way bolt on as is flows 635cfm

46mm fastman and 48mm F&B these bodies offer
off idle low end gains along with the mid and
top end gains

The fastman and F&B are very close in performance
with the F&B having just a little better response
crisper

All 3 have the same peak gain mid and top 15 to
18hp at the wheels but would you not also want
the off idle low end gains

MSD wires same year 5.2 you will have 2 wires
left over but a perfict fit

92 to 03 multiport injection the mods will work
on all same on the V8's

The MSD systems are very easy to install all you
do is power ground and use the 2 exsisting coil
wires to hook them up obd2 96 and up you will
also need the tach adapter or it will trow coil
circuit codes

the hardest part is figuring out where to mount
the box

With the MSD system coil box and wires yes you
need good wires it will fry the stock wires
right near the ends

very important plug gap
champ autolite .060
NGK Vpower .055
I would go right ot the ngk 1 colder FR5 for best
resaults with the MSD system don't mess around

Larry
J&J Auto

Ricky Marten
Dodge Dakota
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3/13/2007
22:51:22

RE: 3.9 Suggested Mods?
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I have a 1996 Dodge Dakota 3.9 v6, V8 throttlebody ported and polished, intake manifold port matched and runners cut back 1.5 inches, jba ceramic coated headers and y pipe, ported and polished heads, performance springs, krc210 cam, harland sharp 1.7 roller rockers, performance lifter, heads shaved .020, Keith Black 10 to 1 pistons, 2400 rpm stall convertor, transgo shift kit, 3.9 gears, crane ignition, e3 3.64 plugs and custom pcm flash. 180 degree thermostat and relocated IAT and 14 in open element air filter. This truck runs a best time of 14.7 in the quarter mile, it's been dynoed at 239 rwhp. I run an xtang bed cover. I have to run 89 octane with cruise control set to 60, I have a personal best of 27 mpg.

Ricky



boomer
Dodge Dakota
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3/25/2007
11:30:06

RE: 3.9 Suggested Mods?
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hey larry you mentioned this about the TPS

"Oh almost forgot throttle position sensor
center wire and ground set at .7 .75 volts
this will help throttle response and trans
reaction"

are you setting the center wire and ground with a scanner or is there a different way to set the voltage?




daddio
Dodge Dakota
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3/26/2007
16:58:25

RE: 3.9 Suggested Mods?
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boomer, just use a digital VOM.



TDknight08
Dodge Dakota
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3/26/2007
17:34:16

RE: 3.9 Suggested Mods?
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VOM? im intrested in it too. you mean like a voltometer?



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