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  #51  
Old 02-10-2012, 04:49 PM
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How often do you drive your truck and, on average, for how long? Do you consistently get it up to operating temp?

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  #52  
Old 02-10-2012, 05:09 PM
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It was my daily commuter for about 45-50 miles which were mostly highway, so it go up to temp. Now since I had to quit that job due to physical problems I don't drive it nearly as much. I've went ahead and swapped the t-stat back to stock while I was changing out my abs sensor the other day, so maybe it will get better. I noticed a slight drop after initially putting in the 180 t-stat, but it was only like 1-1.5 mpg so I'm skeptical of just blaming the bad mileage on that.
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  #53  
Old 02-10-2012, 05:18 PM
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a 180 tstat is possible to cause a slight mpg drop. if the engine doesn't get to proper running temperature it will run in cold enrichment road and run a little rich. I'm a big advocate of using 180 tstat's, but there are circumstances when they cause problems like you may have.
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  #54  
Old 02-10-2012, 05:35 PM
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Quote:
Originally Posted by snrusnak View Post
a 180 tstat is possible to cause a slight mpg drop. if the engine doesn't get to proper running temperature it will run in cold enrichment road and run a little rich. I'm a big advocate of using 180 tstat's, but there are circumstances when they cause problems like you may have.
I don't think getting up to temp. was the issue, I easily got it to 195 w/ the 180 t-stat. Maybe the 3.7's just aren't efficient w/ 180 t-stats, hopefully this solves it. I'll report back after a few tanks.
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  #55  
Old 02-10-2012, 05:38 PM
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Keep in mind that not only does it need to get to operating temp, but it needs to remain there. Do you know for sure the temp of the coolant or is it approximate? There's a good chance your coolant temp is hanging around 180-190 if that. Especially if you run the AC a lot (I think the v6 rams have an electric fan in front of the radiator for the AC condensor)....this would cool it even more. Just something to keep in mind. If you have a 180 tstat then normal operating temp should not be 195, it should be close to 180. Stock normal operating temp with a 195 tstat is about 195-200.
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  #56  
Old 02-10-2012, 06:53 PM
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The newer 4th gens have only an electric fan on the v6. The 3rd gens like mine have a separate radiator/condenser for the AC which has an e-fan and a clutch fan for the radiator. I've done a lot of bolt ons to the truck and when it was stock w/ the clutch fan it ran about halfway up the temp gauge on the dash and always got 16mpg. Comparing that to the readings I get now from my aeroforce interceptor for coolant temp show halfway on the gauge to be about 200-210. It really only got in the 190's, maybe 200 if I was sitting for awhile w/ the 180. When I didn't yet have the interceptor and put an e-fan on the truck I set the controller using the gauge on the dash to come on a little over halfway. W/ that setup and the stock t-stat I was getting 18-21 mpg consistently. I did several other mods, none of which effected the mpg and finally did the 180 t-stat as advised by hemifever for the tune he wrote for the truck. W/ the 180 I saw mileage drop down to 19 max. For some reason the mileage just kept slowly falling for the next 1.5 years, now I'm back to 16-17, 15 on the last tank (maybe bad gas). I'm at the point of having only a couple things left to try to get it back to where it once was.
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  #57  
Old 02-10-2012, 08:44 PM
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Ok, could it maybe be the tune?
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  #58  
Old 02-10-2012, 10:02 PM
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Quote:
Originally Posted by snrusnak View Post
Ok, could it maybe be the tune?
I don't think it is. I stopped running the 93 tune a month or two ago. I'm running an 87 tune, I think the only thing modified in it is torque management which is non-existent in my manual tranny truck to begin with. The only things I had left to try were the thermostat and going back to iridium plugs. Thanks for your input.
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  #59  
Old 03-05-2012, 08:02 PM
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new here figured i would report on this i have an 06 manual when i first got it I was getting about the same as you mileage wise
this is what i have done and my gas milage has jumped way up 16-17 in town 21-23 hwy
air raid cold air intake system
high flow cat with cat back exhaust
bully dog programer
iridium plugs
the most noticeable thing i did was the intake and exhaust but i cant complane about my gas milage now and a noticipal power increase
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  #60  
Old 03-05-2012, 11:02 PM
chambers chambers is offline
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I was unaware bullydog made a tuner for the 3.7, don't see one on their site?
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