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Alec
Dodge Dakota
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5/17/2005
18:38:04
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 Subject: Save highway $$$
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Message:
What's the best mods for a 3.9L Dakota that can really gain some MPG. I'm gonna be drivin on the highway nonstop a lot next year, and I want to get my Dakota as efficient as it is attractive. A mild loss in HP/Tq is not a problem for me.
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daddio
Dodge Dakota
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5/18/2005
09:00:45
| RE: Save highway $$$
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IMO, these are the 3 most cost effective:
1)complete tune up
2)synthetic fluids in engine, tranny and rear
3) properly aligned & inflated tires
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04QuadCab4x4
Dodge Dakota
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5/18/2005
11:53:58
| RE: Save highway $$$
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Message:
Whats a good synthentic tranny fluid?
Please don't respond with Amsoil
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ace
Dodge Dakota
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5/18/2005
12:46:44
| RE: Save highway $$$
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Message:
royal purple
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J and J Auto
GenII
 
5/18/2005
23:04:36
| RE: Save highway $$$
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Message:
royal purple does not make a fluid for the ATF +4
aplication
ATF +4 is a part sythetic fluid
Amsoil universal ATF
Redline ATF also runs well in these trans
stay away from any dextron or merctron V fluids
Larry
J&J Auto
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J and J Auto
GenII
5/18/2005
23:46:42
| RE: Save highway $$$
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Message:
Your main question
Gas mileage and performance on these computer
controlled engines go hand in hand
Do the mods as you can aford them in this order
to get the gains more flow is what you want
making the engine more effecient it works less to
obtain the speed and will use less gas on the
highway working less to maintain speed
Cold air intake
bigger throttle body V8 or after market
V8 good around $100
fastman 46mm better mod stock body $250
48mm F&B best new billet $380
1.7 harland rockers bolt in no adjusting
Now do the exhaust
flowmaster 50 or dynomax 11748 single 2.5 tail
carsound high flow cat
JBA headers direct bolt in manifold replacement
You can also gasket match the intake there is a
big casting hanging down upto a 1/4 into the port
some are so bad the injector spry actualy hits it
Now is when you take a look at computer upgrades
92 93 mopar comp
94 95 manual trans also mopar comp
96 97 hypertech
98 to 03 superchips
92 to 03 Jet stage 2 chips showed a 1 to 3 mpg
gain on every truck we have put them on
tonno cover helps 1 to 3 mpg
All synthetic fluids
I run Amsoil except engine royal purple
The PVI platnium vaper injection system also helps
low end and gas mileage
My 95 4X4 with a 92 motor with 106,000 miles is
pulling between 22 to 25mpg and has hit 25.8 on
the highway
If you live where it does not get below 0 a 180
thermo will also help or go with a stant 195 it
will run around 185
After you get better flow try a set of Autolite
3923 plugs this is 1 range colder with the better
flow things heat up a bit and these will run
better AP plat tip gap .040 to .045 reg gap at
factory .035 to .040
A good cap and rotor like the Napa MO26 &28 have
solid brass incerts and will transfer more volts
to the plugs also a good set of wires like the
taylor 8mm or MSD 8.5
Larry
J&J Auto
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97Dakota
Dodge Dakota
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5/19/2005
11:00:48
| RE: Save highway $$$
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Message:
Larry,
I have a 97 cc with the 3.9L and I have been searching for a computer upgrade for it. Many people told me that they don't make one for the 97. only 98 and up. Are you sure that hypertech will work for me and how much of a gain will it get me. Currently I have the MSD coil, 8.5 MM wires, homebrew CAI, AP5224 plugs at .50 gap, and hard tonneau. Next will be catback exhaust, ignition box, and 48mm TB.
Thanks in advance for all your help
Lance
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wadak
GenIII
5/19/2005
22:14:29
| RE: Save highway $$$
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Message:
97 dakota,
I have the 97 dak with the 3.9 engine, follow Larry's advise. Do the intake stuff first, Cold air intake, bigger throttle body, roller rockers, then cocentrate on the exhaust free flowing muffler, high flow cat (meow), you can either replace you exhaust manifolds with 92/93 exhaust manifolds, or JBA headers, you can increase performance also by going with a hotter coil, better plug wires than stock, get the autolite 3923s and gapping them out to .045, you could also go with a complete MSD system. There is no Superchips or hypertech available for the 97 v6, your best bet is to do the CPS mod and go with a Jet stage 2 chip. This will give you some pretty good gains and descent gas mileage ta boot. I getting 16 to 18mpg in heavy stop and go mileage and 21 to 23 on the freeway. The jet chip will add about 2mpg and running the PVI injection another 2 mpg.
92 and 97 Daks both with many mods.
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Alec
Dodge Dakota
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5/19/2005
22:41:58
| RE: Save highway $$$
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Message:
So waht is the most cost efficient...
Looking to stay under $100...if pososible.
I already have a cold air intake, and free flowing exhaust. Will a Jet stage 2 chip off EBAY work well? (correct part # of course).
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