Functional hood vents/louvers

Dmak

Specialist
Nov 19, 2017
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09 bmw 135i
Since i installed relocated inlets, my filters sits almost right on top of the turbos. Filters would get super hot after some driving. I would like to know if anyone cut their hood and installed some functional hood vents/louvers to reduce under hood temp. And help with cooling.

http://vraptorspeedworks.com/ez-install/

Found this company that makes different size vents.

If anyone have done it, would like to know how much it improve? And location of the vents?
I also did some google search and found a hood pressure map was done on a maita(google image maita hood pressure) i know its on a maita, but all hood is similar. Seems like best placement for vent is on the two sides just slightly forword of hood center line.
Any info/help/pictures/results would be nice from someone that have done it, rather its on a bmw or other vehicle. I have a e82 btw.
Another question would be how to block water from getting right into the air filters, my guess is some lind of shield to cover up the filters.
 

buster84

Corporal
Mar 24, 2018
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What about rain? Does it have a way to block water from soaking your filters?
 

doublespaces

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Oct 18, 2016
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I think hood vents are super important IMO. If I had them, I'd be less inclined to feel like I should pop my hood after I park. I'm going to just get them integrated when I switch to a CF hood
 

Rcboosted2007

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Jan 28, 2018
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7E6C237B-76E2-43FF-AB0F-49829095E1C9.png
 

Dmak

Specialist
Nov 19, 2017
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09 bmw 135i
What about rain? Does it have a way to block water from soaking your filters?
I think the best way is to have a cover for the filters to make sure no water can directly hit the filters. The rest of the engine is mostly water proof or already have plastic covers. But also depend on the region, i cant speak of region with heavy rain all the time.
 

doublespaces

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If people can get away with the bms cabin filters, I have little reason to believe this would be a problem.On the other hand, this is the engine air filter and I've seen some pretty nasty thunderstorms so take this with a grain of salt. I don't really care for the open exposed setup of the bms cabin filters anyway.
 

Dmak

Specialist
Nov 19, 2017
75
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09 bmw 135i
I think hood vents are super important IMO. If I had them, I'd be less inclined to feel like I should pop my hood after I park. I'm going to just get them integrated when I switch to a CF hood
I m kind of surprise there isnt more top mount single turbo guys looking into hood vents to reduce under hood heat. Lower under hood temp would for sure help with plastic parts/wirings/ect to last longer. Maybe even help with oil seals to last longer before leaking
 

doublespaces

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Oct 18, 2016
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I m kind of surprise there isnt more top mount single turbo guys looking into hood vents to reduce under hood heat. Lower under hood temp would for sure help with plastic parts/wirings/ect to last longer. Maybe even help with oil seals to last longer before leaking

Nobody likes to cut holes in their hood mostly. And they look a bit tacky on the bottom once you do. However a custom hood can have them integrated, probably the cleanest solution.
 

The Convert

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Jun 4, 2017
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Nobody likes to cut holes in their hood mostly. And they look a bit tacky on the bottom once you do. However a custom hood can have them integrated, probably the cleanest solution.
Only downside there, assuming you're talking about a half circle scoop to mate with the turbo inlet is no filter and fitment nightmare. A properly fitting hood scoop/turbo inlet, however, would look sick.
 

doublespaces

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Oct 18, 2016
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I'm mostly just referring to the cutting of the hood necessary to fit the louver'd grills/vents
 

Nosrok

Private
Jan 31, 2017
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Have you removed your cowl? If so you should consider putting it back on, same with the under body trays. They help direct the air coming in through the grill, the cowl blocks air from pushing in near the windshield at higher speeds.

You could probably duct fresh air from the fog light area to that side. Also a few people have flipped the factory airbox scoops/duct to the other side and it seems to work.

As for vents you want them near the front so the air moving over the hood pulls the hot air out of the engine bay. Slightly behind the radiator is where I'm looking to place mine, very similar to one of the available hoods.
 

Dmak

Specialist
Nov 19, 2017
75
40
0
Ride
09 bmw 135i
Have you removed your cowl? If so you should consider putting it back on, same with the under body trays. They help direct the air coming in through the grill, the cowl blocks air from pushing in near the windshield at higher speeds.

You could probably duct fresh air from the fog light area to that side. Also a few people have flipped the factory airbox scoops/duct to the other side and it seems to work.

As for vents you want them near the front so the air moving over the hood pulls the hot air out of the engine bay. Slightly behind the radiator is where I'm looking to place mine, very similar to one of the available hoods.

For me. Stock cabin filter with the cowl all still there as well as under tray. For factory set up hot air only get out from bottom of the car after the belly pan. With factory cabin filter tray/cowl removed, it will only hurt cooling since its high pressure at base of windshield.
Heres the problem i see. The only other way to improve cooling vs factory system is really just have vents on hood. Factory ducting is already pretty well done. I will see how it fit with the factory air duct flip so air goes to the right side.
 
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