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Originally Posted by steve05ram360
Truck... 2005 dodge ram 4x4 diesel with 3" lift, 34" tires & AT...
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The lift is hurting your FE more than anything else. It seems funny to talk about an underbelly when the truck is standing so tall and has such large tires.
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So... mode 1, port the airbox and attach a hose to it in such a way that it would draw air from the back of the engine by the firewall so it is warmer than what it gets from the front... (I'm convinced the motor gets the best performance when ambient air temps are at 80~85F)...
Second mod would be to draw that warm air across the fuel rail to warm up the rail a tad bit... On the flip side of the coin...one mod I did a while back on my last gas truck was to cool the fuel. This gave me a 6% average bump in mpg over the 1600 miles I tested the mod on... did approx 800 w/o the cooler than 800 with, cant argue with the data.
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Sure we can argue with the data. We have no idea how you controlled other variables or how you measured anything. In one sentence you say warm fuel will improve FE, the next sentence you say cold fuel improves FE. Which is it?
On what principle of physics does heating or cooling the fuel improve the thermodynamic properties of combustion?
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I have not measured the current mpg yet so I dont know where it sits now. The goal is to get up to 20~21 mpg on the hiway doing approx 65 mph.
Anyways, what do you guys think?
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I think you should chart your current MPG so that you have a baseline to compare with. Even better yet, do ABA testing with any mod that might affect aero or rolling resistance. Without this, there will be no evidence that any work you do has any benefit.
20mpg at 65mph should be achievable from a stock truck. Stop modifying the truck in ways that hurt FE, and improve the efficiency of the driver; this will help the most.
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Originally Posted by steve05ram360
hummm interesting. So cooling the fuel to a point would probably be good then...??? Are you aware of anyone actually putting warming fuel to the test?
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Warming or cooling fuel just isn't something worth bothering with. It's not going to make a noticeable difference, and the truck is already designed to operate within a range of temperatures.