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Brandon
Dodge Dakota
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3/01/2006
13:09:36
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 Subject: Cold air = bad gas milage???
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I have a 03 v6. I am intalling a functional Six Pack hood scoop on my truck right now and I was wondering if all that cold air will hurt my gas milage? I am setting it up to be a ram air packege. Also how much will it bring my gas milage down and what kind of HP/TQ gains am I looking at? Thanks in advance.
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1hotkadota
Dodge Dakota
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3/01/2006
14:30:49
|  RE: Cold air = bad gas milage???
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Actually the complete opposite is true. The colder the air entering your engine, the more dense it is. Air density is a factor because the more air you shove into your engine the better. More air into your engine then translates into more power being produced at lower RPMs which uses less fuel. Basically, cold air = more power and fuel economy. In the end you could gain up to 2 mpg. Hope this was helpful. Good luck with your ram air setup. Post some pics cuz I'm interested in your design.
02 RC 4.7 Auto
H.O. cams, Intake, Exhaust
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Nerther
GenIII
3/01/2006
14:59:03
| RE: Cold air = bad gas milage???
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Hrmm, but the more dense the air is, the more gas it need to keep the air/fuel ratio..
So in theory, it will take more fuel, which = more power..
Also, if colder air means better gas milleage why were they putting those kind of "air heater" (taking hot air from above the exhaust manifold) on older dodge ram.. Just a thought..
I could be totally wrong, but my gas milleage DOES decrease with the temperature during winter.. But it does get freaking cold around here..
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daddio
Dodge Dakota
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3/01/2006
15:21:19
| RE: Cold air = bad gas milage???
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mileage will decrease with temp.
nerther, those "air heaters" were to help the engine warm up faster to lessen emissions.
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OBIO3
Dodge Dakota
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3/01/2006
19:39:07
| RE: Cold air = bad gas milage???
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Nerther........ I also live in the cold country. Montana. That said, I see several reasons to lose gas milage and power also in winter. The colder the day the worse it becomes. My 99 4x4 CC goes from 18.3 tops sunmmer to 15+ and on a 40 below day 14'S . These are freeway numbers. Cold air is dense. colder the worse. Takes more to bust through dense air. Ever part in your drive train runs cooler making them harder to turn. Wheel bearings, u joints, trans, diff....... yes they warm after a fashion but not like summer time. Worst of all is the winter formula used in gas. The day they start using it you take a big hit in milage. It's a never ending battle to keep the truck clean in winter. almose impossible. dirty cars use more gas going down the highway > add it all together and just give up > you can not win this battle
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Big Ed
GenIII
3/02/2006
07:02:38
| RE: Cold air = bad gas milage???
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Mileage will DECREASE with temp. at least mine does each and every winter. The temp air sensor enriches the fuel/air mixture the colder the temp.
I believe thats why they want you to relocate the tas to the upstream side of the TB when you install a cold air intake. More fuel means more power, the colder the air sensed the more fuel used.
Kowalski or GraphiteDak could share more lite on this subject.
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prodak
Dodge Dakota
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3/02/2006
10:21:23
| RE: Cold air = bad gas milage???
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Here's a quote from Larry/J&J Auto (http://www.dodgedakota.net/boards/v6/7538.html):
"You want gas mileage stick your intake tube on the radiator and let it suck hot air and watch what happens to your mileage it will jump."
When I first got my Dak I removed the snorkel from the airbox, made the hole bigger, and cut out the "flap" next to the radiator - gained almost 2mpg. After reading that comment from Larry I replaced the "flap" and was astounded to see almost another 2mpg gain, winter AND summer.
So the answer to Brandon's original question is yes, cold air will drop your mpg. But remember that these engines want more air regardless, even if it's hot air. That's why some people report mileage gains with CAIs - it's the increased volume of air that's doing it, not the lower temperature.
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Dan M
Dodge Dakota
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3/02/2006
11:48:32
| RE: Cold air = bad gas milage???
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There is obviously a point at which your mpg will peak as the temp changes . I have not found any good articles or information on that point.
Keep in mind that many CAI's are not really cold air. In order for the air to be truely "cold" it can't come from within the engine bay. To be a true cold air intake, you are looking at something like ram air. In Ram Air, the air enters the filter directly from outside the engine bay via the hood. Most CAI's I've seen take air in via the wheel well. Notice that the entire filter is not in the wheel well and hot air from the engine will enter the filer on one side while cold air from outside will enter on the other. Granted this hot air from the engine bay is cooler than taking air in from other locations in the engine bay.
A cheap simple example. I replaced my stock air box on my 95 3.9L 4x4 with a 10" edelbrock air hat. After doing so I was able to get more throttle response (no delay in hard acceleration since air didn't have to be sucked in through a smaller opening) and still get the same milage. How can I get more performance and not lose gas milage? efficieny.
- Dan M
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prodak
Dodge Dakota
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3/02/2006
12:16:58
| RE: Cold air = bad gas milage???
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That's a perfect illustration of what I was talking about. A 20F degree drop in air temp only increases density by about 4%. You'll get WAY more O2 into the motor by enlarging the filter intake area than you ever will with outside air - and the PCM is dumping more fuel in to compensate for the cooler air anyway. A true CAI really only matters at WOT when the TB is at max VOLUME, and the only way to get more O2 beyond that is more DENSITY. (carbed motors are of course a whole different deal)
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1hotkadota
Dodge Dakota
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3/03/2006
13:57:08
| RE: Cold air = bad gas milage???
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Elevation might come in to play as well. I live in phoenix and during the summer my gas mileage drops.
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Dan
Dodge Dakota
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3/04/2006
03:14:03
| RE: Cold air = bad gas milage???
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Cold air is more power! More power takes more fuel. end of story!
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