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eddy
Dodge Dakota
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12/17/2003
10:28:11
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 Subject: RE: Gas mileage? HAH!
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Really seems like our trucks are very throttle sensitive when it comese to gas mileage. Last two tanks I was at 11.8-12 mpg about 60/40 city/highway with frequent wide open throttle. Now Im driving like a Grandpa and I had almost 130 miles at a quarter tank, whereas on the two previous tanks I was at a quarter tank by about 80 miles.
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yak
Dodge Dakota
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12/20/2003
15:58:23
| RE: Gas mileage? HAH!
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I have just bought a new 03 dakota with the 4.7l five speed in a regular cab. I have added a K&N air filter and a flow master dumped behind the cab I have about three grand to play with right now and I was wondering what mods I can do to it to make it faster with out killing the gas mileage. I have a 23 mile (one way) trip to work.
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Jeep
Dodge Dakota
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12/21/2003
09:37:28
| RE: Gas mileage? HAH!
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HO cams.
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ricardcapecod
Dodge Dakota
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12/27/2003
17:53:31
| RE: Gas mileage? HAH!
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CAI (cold air intake), Fastman 68 or 69 mm TB, HO cams, headers and cat back. Take the opportunity and remove the clutch fan and keep it stored in a vertical. Add a 180* Tstat that you may have to put alway during winter if you live up north. As to gas mileage, it can be better and worse. If you drive exactly like you did before mods, it will be more economical. If you drive observing the rules for economy, it will be a lot more economical, but, if you start playing with it, obviously it will use more gas. Remember that now, your engine is able to pump much more air and "GAS", then before. You will love it. When you have to change shocks, get Edelbrock IAS. It is hard on good asphat and soft on holes and bumps. Let us know.
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Thomas
Dodge Dakota
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10/02/2006
18:59:59
|  RE: Gas mileage? HAH!
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i was reading through your forum and found a post that said warm engines get better gas milage. this is true the reason behind this is that when your engine is hot your fuel atomizes better and fuel vapors are the only thing that burns, the rest goes out your tail pipe. i spent about one hour and zero dollars devising a way to heat the air before it goes into my engine. it worked and my 2000 5.9 dodge durango is getting 20mpg in the city. i dont know what it gets on the highway because i have a beater ford aspire that gets 55mpg that i use for highway trips. my friend did the same thing to his honda civic and he leaped from 38 mpg to 54. oh by the way i was averaging 12 mpg city and 15 hwy before the mod to the durango
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Yorke
Dodge Dakota
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10/03/2006
10:24:36
| RE: Gas mileage? HAH!
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Does changing your cams to the H.O., void any warranties you have on the vehicle, just curious I have quite a bit of warranty left.
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Risto
Dodge Dakota
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10/03/2006
22:09:12
| RE: Gas mileage? HAH!
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just wonderin how u heated up the gas before it got the the endgine
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shatto
Dodge Dakota
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10/04/2006
01:07:27
| RE: Gas mileage? HAH!
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Okay,Thomas,
Please explain how you did something contrary to every performance rule, and increased MPG.
If heating air made for better performance;
Those idiots should have made interheaters.
The factory air intake would be wrapped around the exhaust manifold.
Manufacturers would route the exhaust to heat the intake manifold before heading south.
I would like to know anything that actually does improve MPG, since I burn a couple hundred miles worth of gas every day.
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wtf
Dodge Dakota
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10/04/2006
02:40:19
| RE: Gas mileage? HAH!
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yorke...where the hell did that question come from? that was so off topic... but anyways... no doesnt void
shatto=correct
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N56629
Dodge Dakota
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10/04/2006
06:38:34
| RE: Gas mileage? HAH!
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"Okay,Thomas,
Please explain how you did something contrary to every performance rule, and increased MPG."
Did anyone else here hear Thomas say one damn thing about "performance?"
Shatto, performance does not necessarily equal efficency. In Thomas' case he was looking to increase his gas mileage not increase his horsepower. You can increase both up to a certain point and then you have to start sacrificing economy for horsepower.
By warming the air you effectively lean the mixture. In reality the air/fuel ratio stays the same but you use less of both. Warm air is less dense so the computer maintains a/f mixture by providing a smaller fuel charge.
"The factory air intake would be wrapped around the exhaust manifold.
Manufacturers would route the exhaust to heat the intake manifold before heading south."
Basically that is correct. That is exactly what manufacturers used to do. Haven't you heard of heat risers? They used to use a thermostatically controlled valve that brought air up right off the intake manifold and once the engine warmed up the valve would close and then air would come thru the snorkle on the air cleaner housing.
That's pretty much how I increase, or more accurately attempt to maintain, my gas mileage during winter. On ice and snow I have no use for increased horsepower.
wtf, shatto does not = correct but should stick to amsoil topics. This is a topic about "Gas mileage" not horsepower.
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shatto
Dodge Dakota
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10/04/2006
11:07:12
| RE: Gas mileage? HAH!
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N56629,
As you said, heat risers and the like, are used to heat the engine up faster. The valve closes, so cold air enters the system once the engine is warm.
Drag Racers are proof of what you said about performance only. Raw fuel as part of the exhaust is proof of that.
We know from those ultimate mileage contests that it is possible to lean out the mixture to a point where obscenely high mileage results. Hell, my father told me how he could get ultimate range from his WWII P-38, by going to full throttle, then leaning the mixture until it began to overheat. We cannot legally duplicate any of this in a modern vehicle. The smog controls require a rich mixture and cool combustion to function properly. Dodge (at least my 98 3.9) use a different catalytic converter than other manufacturers because Dodge engines run leaner than the competition.
So far as I can tell, you and I said the same thing differently.
Careful, you said I know what I'm talking about when it comes to Amsoil. Thanks for the complement.
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N56629
Dodge Dakota
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10/04/2006
15:39:56
| RE: Gas mileage? HAH!
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"The smog controls require a rich mixture and cool combustion to function properly."
Cool combustion? Is that why they use hot plugs and 195 degree stats?
Btw, optimum fuel efficiency on most aircraft is roughly 125 degrees on the lean side of peak. As you lean the egt rises, peaks and then begins to fall. Max power is approximately 125 degrees on the rich side of peak egt.
Increasing the temperature of the air intake still increases mpg. This is what Thomas was saying so we in no way agree nor are we saying the same thing in different terms.
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Risto
Dodge Dakota
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10/05/2006
23:08:55
| RE: Gas mileage? HAH!
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don't the manufactors but a thermostate in the air in take to to figure out what temp the air is
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