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Old 05-13-2019, 01:03 PM
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Aftermarket Hoods & Louvers

So who has aftermarket hoods? Louvers etc? And more importantly- who has experienced heat reduction from it? That's really all I care about but since that thread fizzled I figured I'd go more general. Secondarily of course fit and finish is important...so fire away.

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Old 05-13-2019, 01:16 PM   #2
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I have the Poison Spyder louvers. They fit fine, the template they send is spot on. You just have to get over the fact that you are cutting a large hole in your hood.

It does help with heat reduction.
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Old 05-13-2019, 01:27 PM   #3
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What he said ^ I've drilled and cut so many holes in my Jeep, I got over it a long time ago. It's like an oven in there. The louver works. My battery used to be hot to the touch before the louver. Just be sure to care for your hole properly so it doesn't get infected.
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Old 05-13-2019, 01:29 PM   #4
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I have the Poison Spyder louvers. They fit fine, the template they send is spot on. You just have to get over the fact that you are cutting a large hole in your hood.

It does help with heat reduction.
Going this route as well. Know two locally that run them and they both said it helps especially here in AZ.
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Old 05-13-2019, 01:36 PM
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I don't mind cutting a hole in the hood now that she's paid for. But I've heard 50/50 on the louvers locally. However the purpose of the thread is "need more input". LOL
(Who can name that movie...)
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Old 05-13-2019, 01:44 PM   #6
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I don't mind cutting a hole in the hood now that she's paid for. But I've heard 50/50 on the louvers locally. However the purpose of the thread is "need more input". LOL
(Who can name that movie...)
Said by Number 5, AKA Johnny 5. Short Circuit.
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Old 05-13-2019, 01:59 PM
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Said by Number 5, AKA Johnny 5. Short Circuit.
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Old 05-13-2019, 02:27 PM   #8
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Said by Number 5, AKA Johnny 5. Short Circuit.
Shit.....that's taking it back....old school movie right there!
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Old 05-13-2019, 02:32 PM   #9
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Back to the topic at hand.....I've been debating one of these....so do you think paint matched to blend in or black?
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Old 05-13-2019, 02:38 PM   #10
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Personally, I like the contrast in the black to body color. Now, on my JK, it's black on black so the only contrast is gloss PX8 paint to the flat black of the PS louvers. However, I also have a WK2 Trailhawk with the flat black hood decal, which is close in size to the PS louvers and it looks sharp against the white body color. Another friend has an orange TJ with the black PS louvers and it looks sharp.
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Old 05-13-2019, 05:01 PM   #11
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Just be sure to care for your hole properly so it doesn't get infected.
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Old 05-13-2019, 06:08 PM   #12
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I have the Poison Spyder louvers. They fit fine, the template they send is spot on. You just have to get over the fact that you are cutting a large hole in your hood.

It does help with heat reduction.
Same here. I haven't measured the temps, but you can see the heat escaping from the louvers. Put it this way, it can't hurt to have them!



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Old 05-14-2019, 06:38 PM   #13
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Only choices for me would be either my hard rock good or the AEV heat reduction hood
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Old 05-14-2019, 07:00 PM
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Did you add the hood or did you buy the Anniversary edition Jeep? If it was added later..any notable heat loss?
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Old 05-14-2019, 07:11 PM   #15
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Im likely to go with the Daystar hood vents.
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Old 05-14-2019, 08:04 PM   #16
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I have a Hard Rock so I have the hood vents but why must the vents only be on the hood? I added vents on the body. They pull a lot of heat out from under the hood.
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Old 05-14-2019, 08:13 PM   #17
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For some reason I thought I read before that this idea of heat reduction was debunked.

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Old 05-15-2019, 12:21 PM
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For some reason I thought I read before that this idea of heat reduction was debunked.

ben
That's the point of the post- looking for actual users with noticeable/verifiable heat reduction. There have been a thousand overheating threads with some "a hood helped" comments- but just as many that say it didn't. Trying to separate the hood issue.
I have spoken to people that say they've seen a heat reduction but it's been pretty anecdotal. A lot of people here run the PS louver- but frankly PS has a huge band wagon out here because they're local. I get a lot of "yea- it helped" but it seems more for looks on the JKs. I see them more on TJs and LJs. My problem isn't crawling - and that's where PS says theirs works best. But the posters here have seen reduction so that's good.

Most aftermarket hood purchases seem to be for looks. I've emailed several companies asking for data and no one has responded. Ironically the only actual data I could find was on Daystars vents- but that was years ago and I can't find it now. It's pretty surprising everyone says "heat reduction hood" but no one can prove it. They all copied the Anniversary/AEV and rolled with it.
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Old 05-15-2019, 12:28 PM   #19
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Me: If I chop a giant hole in my hood whats going to happen? Rocket Scientist: Hmm... I dont know. You tell me.
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Old 05-15-2019, 12:29 PM   #20
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For some reason I thought I read before that this idea of heat reduction was debunked.

ben
I think the engine will cool itself well enough with that big radiator and oil intercooler.

The heat reduction is mostly useful for the electronics in my opinion, and there's a lot of it under the hood. In fact I've had circuit breakers pop for no apparent reason while rock crawling on hot days before I had hood vents.

Also look at all the plastic parts under the hood, plastic doesn't do well in high temps over time; becomes brittle.
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Old 05-15-2019, 12:50 PM
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I think the engine will cool itself well enough with that big radiator and oil intercooler.

The heat reduction is mostly useful for the electronics in my opinion, and there's a lot of it under the hood. In fact I've had circuit breakers pop for no apparent reason while rock crawling on hot days before I had hood vents.

Also look at all the plastic parts under the hood, plastic doesn't do well in high temps over time; becomes brittle.
Um; no. There is a small percentage of people that have overheating issues even in the newer JKs. There is a separate section on it in the forum. I have an aftermarket Mishimoto radiator- "bigger" and it helped but didn't eliminate it. No one has been able to come up with a fix that works. Thus the thread...
As to being a rocket scientist and cutting holes in hoods or hoods with vents...there is no guarantee air will flow through those areas enough to make a difference. As mentioned many people on the overheat threads that added hoods saw no difference. Same with vented inner fender liners. (Which I also have but didn't add for that purpose.)
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Old 05-15-2019, 12:59 PM   #22
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2 of lifes little facts: Heat rises & shit flows down hill.
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Old 05-15-2019, 06:18 PM   #23
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My anecdotal view:
1. The engine temp is regulated by the cooling system, fans and computer. So unless there an extreme condition that it can't handle, the engine temp will pretty much be what the computer wants it to be.
2. I have never seen any claims backed up with data from users or the manufactures of any significant before/after heat reduction.
3. My Jeep hasn't overheated since I installed the PS louver. It also didn't overheat beforehand either. Don't know if it is running cooler or not in the summer beach driving.
4. I have seen pics of the plastic wire harness covers deteriorating. They claim it was due to the heat.
5. I do see heat escaping from the louvers. When driving through a puddle, a little steam escapes, but not what I would expect.
6. It doesn't hurt to allow heat to escape, but it may help.
7. I like the way it looks, but will sand get in between the louver and the hood wearing away the paint and cause rust in the long run?
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Old 05-16-2019, 12:27 AM   #24
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My anecdotal view:
The engine temp is regulated by the cooling system, fans and computer. So unless there an extreme condition that it can't handle, the engine temp will pretty much be what the computer wants it to be.
I have seen pics of the plastic wire harness covers deteriorating. They claim it was due to the heat.
You're absolutely spot on about the coolant temp. It's more about ambient air temp under the hood and having a way for the heat to leave from under the hood is my understanding. Keeping all the plastic parts, sensors, and electronics cooler helps extend the overall life, and on some sensors like the air intake temp and related sensors the engine runs better when they're cooler.

I have the AEV heat reduction hood, and let's just say they give it that name for a reason. The actual amount of hood space open for venting isn't a ton but it makes a considerable difference in what the under hood temps are. With my stock hood sitting idling I would watch the temp creep up from 205ish to 230 within 4-5 min until the fan would kick on and bring temps back down, then 3-4 min it would repeat the cycle again. With the AEV hood the temp goes up to about 210-215ish and stops there regardless of how long I leave the engine running. You can watch all the heat poor out of the main hood vent.

Basically what I'm saying is it's worth getting a vented hood/having hood vents. It does make a difference. Just my 0.2 cents.
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Old 05-16-2019, 11:48 AM
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You're absolutely spot on about the coolant temp. It's more about ambient air temp under the hood and having a way for the heat to leave from under the hood is my understanding. Keeping all the plastic parts, sensors, and electronics cooler helps extend the overall life, and on some sensors like the air intake temp and related sensors the engine runs better when they're cooler.

I have the AEV heat reduction hood, and let's just say they give it that name for a reason. The actual amount of hood space open for venting isn't a ton but it makes a considerable difference in what the under hood temps are. With my stock hood sitting idling I would watch the temp creep up from 205ish to 230 within 4-5 min until the fan would kick on and bring temps back down, then 3-4 min it would repeat the cycle again. With the AEV hood the temp goes up to about 210-215ish and stops there regardless of how long I leave the engine running. You can watch all the heat poor out of the main hood vent.

Basically what I'm saying is it's worth getting a vented hood/having hood vents. It does make a difference. Just my 0.2 cents.
THANKS! That's exactly what I was looking for. Actual data.
I didn't look at AEV's site because that hood is just too expensive IMO. But they actually provided data and interesting information exactly demonstrating the point here. it might all be AEV B.S. but they pointed out that not all vented hood designs are the same and others may not work. I look at the AEV and think "not enough opening" but it's like someone actually didn't say "shit rolls down hill; cut a hole it'll work."

[I]Absolutely! Of course we designed the hood to be aesthetically pleasing, but we also put a lot of fluid analysis into the location of the vents. There is a low-pressure area created at the front edge of the hood when the vehicle is in motion, and we placed the central vent of the hood in a position to take advantage of this. Since air likes to move from high pressure to low pressure areas, the placement of the center vent causes cooler outside air to be sucked through the radiator and up through the hood to fill in the low-pressure area[/I].

Chrysler has tested our hood in both the wind tunnel and on one of their most severe hot weather tests, the Davis Dam Grade outside of Laughlin NV. This is about a 15-mile grade with very high engine RPMs, high ambient temperatures, and high loads. Here are some excerpts from Chrysler’s “hot trip” report: “3.8L engine coolant temps ran approximately 5 degrees less with the AEV Hood. AEV hood was then put on a diesel (2.8L) JK and very positive results were experienced. The vehicle ran 5 – 7 mph faster up the grade with a trailer.”

When Chrysler subjected the hood to a different test in the wind tunnel, the results were similar “DAVIS and USCTY were run to evaluate AEV hood. AEV hood helped coolant temp (2.5 degF), Trans temp (4 degF) and Air box inlet Air temp (8 degF). It also helped some thermal protection components during Davis55.”

Besides engine performance, the AEV Hood can help significantly with the heat buildup in the under hood electronics, such as the TIPM (Total Integrated Power Module) which will shut the entire vehicle down if it gets too hot. Don’t be fooled by other hoods that are designed solely for aesthetics, they won’t help cool your vehicle (many have the vents placed in useless areas from a thermal dynamics perspective).


Many people on the overheat threads had aftermarket hoods that didn't help. Arguably AEVs number aren't exactly huge but at least they've tested.
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Old 05-16-2019, 12:41 PM   #26
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I feel like such an idiot knowing that I could have spent $1000 on an AEV hood (not including the paint) to let the heat out of the engine bay instead of the measly $100 I spent on the PS louvered POS that does the exact same thing Boy, do I feel stupid.
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Old 05-16-2019, 01:13 PM   #27
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I feel like such an idiot knowing that I could have spent $1000 on an AEV hood (not including the paint) to let the heat out of the engine bay instead of the measly $100 I spent on the PS louvered POS that does the exact same thing Boy, do I feel stupid.
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Old 05-16-2019, 01:24 PM   #28
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I have a Hard Rock hood (with just the little OEM holes) and live in one of the hottest places on earth. My temperature needle never moves past noon. What are all of these heat issues that people are trying to solve?
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Old 05-16-2019, 01:35 PM   #29
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I feel like such an idiot knowing that I could have spent $1000 on an AEV hood (not including the paint) to let the heat out of the engine bay instead of the measly $100 I spent on the PS louvered POS that does the exact same thing Boy, do I feel stupid.
I'm not going to lie I purchased the AEV hood for the look BUT I will say that I notice as much if not more heat coming from the side vets as I do the top.

I'm not an AEV fanboy by any means, but I do believe they put a lot of data into their designs.

I'm sure the PS louvers work great too.
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Old 05-16-2019, 01:36 PM   #30
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I have a Hard Rock hood (with just the little OEM holes) and live in one of the hottest places on earth. My temperature needle never moves past noon. What are all of these heat issues that people are trying to solve?
Nothing. It's all just a mirage.

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