Need cold air intake ideas for V8 - Page 3 - JeepForum.com
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post #31 of 37 Old 05-30-2021, 03:43 PM
AZdEvilYJ
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Originally Posted by Luuca View Post
If you swap back to the stock i6 4.0, use the factory airbox, and get smaller tires, your MPG will increase somewhat.

Buh dum tiss


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post #32 of 37 Old 05-30-2021, 03:44 PM
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Yeah, but since we're here, how did it end up working out for you Waternut?

More threads need closure like this


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post #33 of 37 Old 05-30-2021, 06:49 PM Thread Starter
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Originally Posted by 93YJ4FUN View Post
Yeah, but since we're here, how did it end up working out for you Waternut?
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Originally Posted by AZdEvilYJ View Post
More threads need closure like this
Where to start... Intake temps stayed down but mpg's never went up. I can't remember the whole chain of events but around this time, the torque converter lock up didn't work on the 3rd transmission. 1st transmission I rebuilt and it worked great for about 500-1000 miles or so but couldn't figure out what was causing a loss of gears and slipping. The other two transmissions were warranty and shotty workmanship from a shop after taking it to a "professional". It was around this time where I really started to evaluate how I primarily use this Jeep and how many miles I was putting on it. I came to the conclusion that in roughly 1500-2000 miles a year that I was putting on it, I'd barely come out ahead after paying for ATF and gas to do another warranty claim. Any mpg's I thought I was missing out on between the torque converter lock up and intake temps were kind of moot in my eyes so I called it good enough.

Ultimately, I chose to ignore the mpg concept and just factor the Jeep as a "pay to play" vehicle. Since then, that 1500-2000 miles has dropped to around 200-300 miles per year on the road as tires got bigger and things changed enough to make it less road friendly. I'm also not sure I've put 100 miles on the Jeep without wheeling in at least a year. The fender wells have been opened up significantly as well due to coilovers in the front thus making under hood temperatures pretty much a non issue. Maybe you can see part of the air filter sticking out in the red circle.
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post #34 of 37 Old 05-30-2021, 06:57 PM
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Thatís about where Iím at in my build as well. If mine stays cool over a day a wheeling Iíll be a happy camper. Mpg is a moot point, but I carry extra fuel in the Jeep cuz I did run out on a long day on the trail. Made for an interesting trip back to the trailer lol


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post #35 of 37 Old 05-30-2021, 07:37 PM Thread Starter
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Originally Posted by AZdEvilYJ View Post
Thatís about where Iím at in my build as well. If mine stays cool over a day a wheeling Iíll be a happy camper. Mpg is a moot point, but I carry extra fuel in the Jeep cuz I did run out on a long day on the trail. Made for an interesting trip back to the trailer lol


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It's funny because even though I have the big gas guzzling V8, I'm usually not struggling for fuel offroad even on long days on the trail. You may be in a similar situation but with my LS engine, I'm just barely above idle on nearly everything but the hardest or steepest trails. I usually shut the Jeep down if people are being slow on an obstacle as well. There are plenty of other people with the 2.5 or 4.0 Jeep engines who have the AC running when they aren't in the Jeep who run out before me most days.


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post #36 of 37 Old 06-16-2021, 06:55 AM
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So I've got my LS installed and it runs great but I have a sneaky suspicion that I'm losing power and possibly fuel economy due my air filter basically being a hot air intake.

On a 70 degree morning, my intake temperature is around 130-135 degrees cruising on the highway. Anything past 85 degrees ambient, my intake temps are 145-150+ degrees. I'm not trying to extract every pony out of this thing but at those temperatures, I suspect the ECU is probably trying to back off the timing to prevent knocking.

Here are the two places my air filter has been positioned and the first picture with the filter over the headers is actually 5 degrees cooler on average so I'm thinking most of the hot air is probably coming from the radiator and less about the exhaust.

Some considerations I'm looking at.... I still want to be able to lower the windshield when I'm offroad so the Humvee style snorkel is likely out unless it's really low profile. I don't have the HVAC box in the cab but I can only imagine that the noise in the cab would be horrendous but I can use that area for something if needed.
Bug catcher / scoop?
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post #37 of 37 Old 06-18-2021, 06:48 AM
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Made my own box, getting air from the hood louvers.
MannyN, did you notch or vent your hood? Can you show us an outside picture with the hood closed?


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