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Old 12-06-2009, 05:07 PM   #201 (permalink)
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Quote:
Originally Posted by JeepNmpg2 View Post
- Screw that! ten percent of my hp to spin a nearly useless fan (ok, it is cooling some, but not enough to be worth 19 hp)

winkosmosis - Where did you get that info on the Cherokee? If you don't mind, could you pass any other Cherokee baselines along? (Cd, etc)
I got the hp at cruise from my Scanguage II.


The cD of the 1997+ was 0.51

http://www.allpar.com/trucks/jeep/cherokee.html

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Old 12-06-2009, 05:10 PM   #202 (permalink)
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No big deal guys, It's all about learning what works best for what car. As long as it relates to the Cherokee's I don't mind. Now for my two cent's worth. Has anyone ever thought about several smaller electric fans? Place 4-6 smaller fans on the radiator and set them up to kick in at different temps. Just a crazy idea.

Ok, for those of you following my Cherokee. The Partial-WAI looks to be a success. Outside temp of 24F, traveling across town with a mostly warm engine I managed to pull 20MPG's. Once warmed up she was purring like a kitten and was sucking in 60F air.
You know that sensor under your radiator? You can move it to other areas of the engine bay to cheat and get a good idea of the underhood temp anywhere under there. You'll have to extend the wires, though.

It will display as outside temp on your overhead display, and might help you find a stable area that you can draw air from to keep the WAI happy.
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Old 12-07-2009, 12:01 PM   #203 (permalink)
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[QUOTE=FastPlastic;145201]No big deal guys, It's all about learning what works best for what car. As long as it relates to the Cherokee's I don't mind. Now for my two cent's worth. Has anyone ever thought about several smaller electric fans? Place 4-6 smaller fans on the radiator and set them up to kick in at different temps. Just a crazy idea.
QUOTE]

I know a few setups use (2) electric cooling fans. You could certainly control them seperately. The more fans you have the harder it is to make a fan shroud. Shrouds definatly increase the effectiveness of the fans.

If you're crafty you could make a multi-speed fan controller. As temps go up, speed goes up. The electric car guys may know how to do this on the cheap & easy.

Which setup uses less electricity would need to be figured out experimentally I believe.

Don
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Old 12-07-2009, 12:04 PM   #204 (permalink)
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Air velocity is important when building a cooling system as well. If the air flows too quickly, it's not extracting heat effectively. If it's not flowing quickly enough, it's not going to draw off as much heat as it could.

Of course, just ensuring that all the air that goes to the radiator is actually going through the radiator is a good start...
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Old 12-19-2009, 10:34 PM   #205 (permalink)
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Some car fans come with their own built in shrouds. The issue would probably be fitting sizes that cover the area of the radiator effectively. For example, if you had a fan/shroud unit that would need 4.3 units to cover the area... that .3 would be radiator square footage not being used to cool the engine.
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Old 01-03-2010, 12:49 PM   #206 (permalink)
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Well, folks. I've seen some of the coldest temps we get around here. One trip home this last tank was at -13F. That's right folks, don't forget to notice the little dash mark in front of that temp. The high we had was about 25F. Tank average came out to be 13.78MPG. Which in my opinion is not bad at all. Just shy of EPA in some nasty weather.

The Partial Warm Air Intake is a great way to hold on to some of that heat from the last trip. I've seen intake temps in the 60F-100F after 30min-1 1/2hrs of sitting. It sucks it in and speed up the re-warming time drastically.
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Old 02-22-2010, 10:45 PM   #207 (permalink)
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Quote:
Originally Posted by Christ View Post
I wasn't arguing, I was noting the reason that the clutch fan wasted energy. Many people don't know, thinking that it's a "great" upgrade... while it is a decent upgrade, the e-fan is a more proper solution.
Yeah I agree with you. Many people might not notice this jeep parts that are also essential actually. It is a pretty good upgrade too.

Last edited by mikeross; 02-23-2010 at 10:20 PM..
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Old 05-25-2010, 04:06 AM   #208 (permalink)
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Well, folks. Finally found me some time to update this thread. Seems the warm weather is here, and I've been enjoying the MPG's that go along with it. I have yet to take out my Partial Warm Air Intake and have found the Cherokee seems to like the warmer air coming in. I've found when it pulls 120-150F air in from what I can tell it changes the air/fuel mix and ends up using just a tiny bit less fuel. So the few seconds I find myself sitting burns less. I just filled her up tonight and found one of my highest in town average yet at 17.98MPG's. That's with only about 10% highway, which is low for me lately.
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Old 05-25-2010, 10:40 AM   #209 (permalink)
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is that with the I6? are you running E10 ? try Wawa gas if it exists around you they tend to be lower ethanol. I get 16-17mpg on E10 but I can get 19mpg on wawa gas.
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Old 05-27-2010, 05:01 PM   #210 (permalink)
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Watch out for the heat. XJs have a problem with heat soak. I don't know what the root cause is, but I've had heat soak make my engine stumble on startup.

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