im pretty sure removing it and having a gaping hole in your hood would help keep temps lower in the engine bay thus helping performance, not just to look "cool"

 

That's actually incorrect. The slats are designed to create a vacuum effect. As air passes over the vent, it creates a low pressure zone and pulls air from the engine bay. It's there for a reason. Leave it be. People are so anxious to change things from stock just because it's not stock. Mitsubishi engineers probably know what they're doing.

-Acree

 

Anyone running the carbon vent from rexpeed?

 

25 months without it, still goin strong.

 

Pics?

 

c'mon seriously... It is all preference on how it looks. Yeah it may help vacuum air out at 120mph but overall with a huge hole in the hood it will aid in cooling the engine. Not like it makes a difference in performance in a street driven application, right? On-ramp bursts, off-ramp turns?? It is all for looks. I can see the hot air flow out of the vent in the hood when I'm at a light. With the vent on, not so much. Obviously, it was there for a reason, for high speed application. I chose to remove mine in the summer and put it on in the winter. Rain on the HOT turbo and manifold is not what I call healthy. Make a decision and do it.

 

i had mine out for a while when i had my celica as my DD, replaced it when it got totaled and turned evo in to DD. There were no negative effects though. However, before I removed mine I did some research also, and one post i had read said removing it causes the top of the turbo manifold to cool quicker than the bottom, resulting in uneven cooling and potential cracking, something to think about. Personally, well for me at least because i am on the stock manifold, i dont see the stock manifold cracking no matter what. While stopped, you can definitely see more heat released as the air above that spot is very blurry.

got some pics from the removal







i hope this helps

 

I'd be interested in seeing data to back up this statement. I'm not saying I have information suggesting otherwise...but there is the bump in the hood right before the vent, which seems to push air up over the vent.

My guess...they designed the vent to keep a majority of the water out of the engine bay while still allowing heat to escape. Bit of the production car "everyman" solution. Given the amount of owners I know w/o the vent (and how many of them track their cars), it seems to have more benefits being off (in terms of cooling) especially on the cool down laps.

I know personally I see a HUGE difference while sitting at a light with it off.

 

thanks for the back up statement!

 

+1

 

If you knew how fluid flow mechanics worked, you'd realize that the vent does more for cooling than not having it on. the vent smoothes out the airflow and channels the air out of the vent. simply having a hole in the hood is not the same thing, and doesn't work as well because of the turbulance in the air under the hood, and outside the hood.

when the air gets under the hood it gets all jumbled up and eventually gets pushed out when the pressure exceeds the pressure above the hood created by the air rushing over the hood at speed. when you're moving, the air moving over the hood is blocking the air under the hood from getting out until it builds enough pressure to overcome it. mainly because it's full of turbulance. if you smoothe the airflow and channel it under the hood, the air rushing over the outside of the hood will actually suck the air out of engine bay instead of pushing against it. the only way for the air to get out of the hood is for it to build up enough air to displace the air outside.

you're assuming that all the air under the hood is just trying to go out of the hole. that's not the case. the hot air coming from the engine is trying to go up, but the cool air coming in is pushing it all over the place. the whole in the hood isn't the only place that air is trying to go. it snakes all through the engine bay finding any hole it can thus cooling very inefficiently, and not really doing much to evacuate the heat from the engine bay. if you channel the air out of the engine bay, it creates a pressure drop and sucks the air out through the hood vent.

this would be easier if I could just draw it lol point is, having a big hole doesn't mean anything if you forget to take into account what the air is doing above and under the hood. the air under the hood is trying to get out while the air outside the hood is trying to get in. whichever one wins, that's the direction the airflow goes, and it just changes wildly and uncontrollably with inconsistent benefit. when you direct the air where you want it to go, you can control the cooling much better and make it a lot more efficient. the engineers knew what they were doing.

 

So if you knew anything about fluid mechanics, you would have data to back up those statements you made. Please explain to me how the chicken wire ~3/4" above the vent louvers enables smooth airflow across the louvers causing them to act as designed. As mentioned before, also explain to me how the bump in front of the entire vent assembly doesn't cause reverse airflow (turbulence under the main stream of air, or vorticies) going INTO the vent. Also, go and re-read your statements about pressures of the air inside the hood and outside the car, and you will quickly realize that you made no sense what-so-ever. You're trying to tell me that the pressure inside of an engine bay is greater than the pressure outside of the car (windspeed) when a car is at speed? Please PM me the price of what your huffing on over there, it must be pretty good stuff.

I have data that shows exactly the opposite of what you are saying, many many many data logs, on the same stretch of road modifying the front of the car, removing and reinstalling all the heatshields and air diverters (Look in through the front grill, aka radiator surrounds) all in the interest of cooling the engine and reducing the air intake charge. With the set-up I have currently, heatshield removed, I am at an average of 7* over ANY ambient air temperature with my current set-up. I can forward you hundreds of data logs showing you this.

Remember, there is a big difference in thinking you know the answer (You), and knowing the answer, me (Because I have data to prove it.)

 

I don't have time to answer all of that, but I said the pressure under the hood is less, that's why it can't get out until it builds high enough to be able to get out.

The "chicken wire" as you put it shouldn't do much to affect a concentrated airflow out of the hood. The bump in the hood before the vent should help in channeling the outside air to where it doesn't want to go back into the engine bay, but it does nothing to make the air inside the engine bay want to come out.

what I was explaining to the other guy is that just because there is a big hole in the hood, doesn't mean the air under it wants to get out. it's just like when you put down your window. the air inside is in no rush to get out. the air outside is trying to come in, and when it does, it pushes the air inside the cabin outside.

almost the same thing is happening under the hood. the difference is that you have air coming in and trying to get out, but the wind outside the hood is steadily pushing against it. that's all I said.

as for data, I've never had the time, nor desire to go through all that trouble. I'm just going from what I know, and speaking about what SHOULD happen. whether it happens exactly like that or not, I can't say for sure, but I do know it'll be a lot closer to that than his theory of air just pouring out of the open hole in the hood.

So you're sitting here arguing that your data shows exactly the opposite of what I said, when really I said the OPPOSITE of what you THINK I said, so in other words, you're telling me I was right....which I knew all along.

before you start an argument, at take the time to realize what the other person is actually saying lol

this is what I said: "when the air gets under the hood it gets all jumbled up and eventually gets pushed out when the pressure exceeds the pressure above the hood created by the air rushing over the hood at speed." I said WHEN the pressure under the hood exceeds the pressure above the hood, air will leave the engine bay. I didn't say it does all the time because it doesn't. it does SOMETIMES once enough air has built up in the engine bay. air is steadily coming in, it's got to go somewhere eventually.

also, you're saying it like there's NO pressure under the hood. the air rushing over the hood is the same air rushing UNDER the hood. it's just more turbulent under the hood and not focused in any one direction. that's why it's hard for it to get out of the engine bay. It wants to go everywhere, and when it splits into 100+ different directions and those small forces aren't enough by themselves to combat the air outside the hood...BUT if you channel it all in one direction, coupled with the bump on the hood before the vent, that should help to pull the air out of the engine bay.

your data should show something very close to that.

 

Well, since we're not dealing with data points...I'll throw my $0.02 in again.

If what you're suggesting is true, why don't all cars have this vent? Seems like cars at speed get rid of air naturally through any opening in the engine bay.