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MattNC
Dodge Dakota
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4/07/2004
15:59:18
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 Subject: 180 Thermostat for 3.9
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Yes, I am kicking a dead horse, and yes i did a sreach for 180 t-stats but didn't find any info for the 3.9, just mainly the 4.7. Im sure that there is no difference, but want to be sure. Where can I get a 180 t-stat for a '98 3.9 and part number? How hard are they to put on? From what I saw it was just a few minutes. Thanks for any help in advance.
Matt
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MY H3RO
Dodge Dakota
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4/07/2004
16:27:19
| RE: 180 Thermostat for 3.9
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MR. Gasket PN 4364 $8.99 at Checker Auto Parts
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dont do it.
Dodge Dakota
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4/07/2004
17:22:34
| RE: 180 Thermostat for 3.9
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i put a 180 in my 3.9l.
the gains were miminal and the mpg loss was 2.
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MY H3RO
Dodge Dakota
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4/07/2004
17:41:51
| RE: 180 Thermostat for 3.9
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Dont do it
Thanks. I was going to buy one tonight because I thought one would get BETTER mpg not worse for this friggin gashog of a V6.
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wow
Dodge Dakota
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4/07/2004
18:29:31
| RE: 180 Thermostat for 3.9
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You actually lost mileage? Wow first time I've heard any post that. Any auto parts store will have it. Easy to take off, a little tricky to get the waterneck and gasket to align with the hose clamped to it so you can put the bolts in. If you do do it, ditch those lousy factory hose clamps and put normal ones on, it will make it much easier. Hardest part is scrapping all the old gasket material off the manifold because of how little room you have to work in.
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yes
Dodge Dakota
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4/08/2004
11:51:00
| RE: 180 Thermostat for 3.9
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Message:
i lost 2 mpg with the 180 t-stat.
if the computer reads the temp to be less than 195 it richens up the fuel mixture.
i drive 100 miles a day to work so i track my mileage every day to see if im still getting the best i can.
my 98 3.9l rc, auto trans, with 3.55 rears gets 22mpg at every fillup.
thing i have done are,
tonneau cover
bosh plat 4 plugs
brass cap and rotor
electric fan(remove belt fan)
synth oil in engine and rear
40 psi in tires
trans cooler kit
and drive like im 39 not 19.
it is a truck with the aerodynamics of a brick,dont expect alot.
i would like to take a poll of anyone who has done the 180 t-stat swap to see if they also lost 1-2 mpg.
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93dak4x4
Dodge Dakota
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4/08/2004
12:13:52
| RE: 180 Thermostat for 3.9
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even with your 2mpg loss you get 20, i get less than 17 on the highway...feel happy.
and how did that trans cooler kit help? i was thinking about doin that myself.
93 dakota 4x4
V8 Tb
Flowmaster 40 single/single
...thats all folks
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MattNC
Dodge Dakota
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4/08/2004
13:28:04
| RE: 180 Thermostat for 3.9
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Message:
Thanks for all the info, guess that's a negative on the 180 t-stat. Glad that you all are all here! haha. Yes, How do you like your Trans cooler? I have been looking at one. I don't have one one but am looking. are they hard to put on? I read some postings that said yes and some no, if not what kind and where did you get it? I don't tow any, just drive back and forth from home to college on some weekends, but i know heat is a major enemy of the tranny. thanks!
Matt
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Darryl
Dodge Dakota
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4/08/2004
14:38:02
| RE: 180 Thermostat for 3.9
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99 2WD CC V6 Auto 3.55's:
Mods:
CAI
Fastman TB
Cat-Back
Bosch +4's #4417
180* Stat
Relocate IAT
NAPA Cap/Rotor
Taylor Wires
Syn Fluids Everywhere(ATF+4)
Lowered 2/4
Snuglid
255/55/17 Wheel/Tire @ 40psi
I have gotten 18-20 mpg since new and nothing has changed. I have done all my mods in steps, so I have been able to track the power/mpg improvement.
After the 180* stat and the #4417 plugs, my slight ping has gone completely away.
For me, 18-20mpg is as good or as bad as it gets, regardless of the mods.
Darryl
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YES
Dodge Dakota
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4/08/2004
17:38:41
| RE: 180 Thermostat for 3.9
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Message:
oh i forgot i also have a k&n drop in filter and a twin tailpipe catback system.
the trans cooler took about 45 min to install.
i cut the hardline on the return side with a dremel and fastened the cooler to the left side of the condenser(front in middle)with the supplyed hardware(use the foam pads)ran the rubber tubeing through the left side of the frontend and used 2 hose clamps on each fitting to attach.
i did the trans cooler just for piece of mind.
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Steve Baldwin
Dodge Dakota
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4/08/2004
19:24:13
| RE: 180 Thermostat for 3.9
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I have been running a 180 stat for over a year now. Took a 2 mpg drop when I installed it. Performance was good. Put in a Jet Stag II Chip and performance stayed the same but the mpg jumped up by 5 mpg. With my current mods of
v8 TB, 1.7 Roller rockers, Modified Intake manifold, FMS 19# injectors, Underdrive pulley, Black Magic 150 electric fan, Accel super coil and MSD-6a, taylor 8mm plug wires, autolite 3923 plugs, 180 degree tstat with Jet stage II chip, JBA Headers and a flowmaster single in/dual out, I get 19-20 mpg around town and 22-24 highway driving.
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wow
Dodge Dakota
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4/08/2004
19:30:09
| RE: 180 Thermostat for 3.9
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Message:
No wonder your mileage is good, 40 psi in the tires, damn.
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yes
Dodge Dakota
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4/09/2004
14:04:46
| RE: 180 Thermostat for 3.9
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Message:
well the tires are rated for max load @ 44psi.
mr baldwin,what do you think gave you the best mpg gain ??? im ready to tinker some more.
the headers
the underdrive pulley
or the headers.
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