evo hood vent
Think about it... how does the air flow?
The point of the hood vent is to move the hot air that passes through the intercooler and radiator out the top. That is why the "fins" on the hoot vent flow that way by pointing the air from the front out the top.
By removing the fins, you are creating air turbulence on the top of the hood. What happens is that some of the outside air tries to push down into the empty space, while the hot air inside is trying to get out.
The net effect is that the hot air that passed through the intercooler and radiator no longer goes out the top, and instead stays trapped on the lower part of the engine bay. At the same time, some cooler air gets shoved down from the top, but not enough to offset the lowered efficiency and higher temperatures of the radiator and intercooler.
Now since you're moving forwards, if you remove the vent fins then the cooler air ends up entering the vent and going backwards once it enters the hole, so it would likely be mostly cooling the top of the engine and going backwards. There would be some air turbulence inside, of course, mixing some hot and cool air together. But since air is being pushed in, the hot air that is already there stays mostly in the lower areas around the radiator/intercooler. It gets cooled off a bit due to the cooler air being around, but the idea of the intercooler and radiator is to pass air AS FAST AS POSSIBLE through them, not to create obstructions by creating a high pressure area behind them.
Even if you had a wall of cool air behind the intercooler and radiator, if it is blocking the air passing THROUGH them by pushing air the wrong way in, your radiator and intercooler temperatures WILL increase.
So, just to make the logic simple, it would be even better if you could put a fan pointing outwards to replace the fins, so that hot air is EXHAUSTED or blown out of the vent, thus drawing the hot air that just passed the intercooler and radiator out. You do NOT want to be trying to push air INTO the vent.
The ONLY time removing the hood vent might help is if you're sitting idle. But then, if you've just finished a race, open the hood up and you'll get 100 times better cooling, and you won't be sacrificing the functional air vents.
I've heard too much false info about this in the past, and this info is legit. If you think about what I said, it makes perfect sense and is why Mitsu engineers put it there.
The point of the hood vent is to move the hot air that passes through the intercooler and radiator out the top. That is why the "fins" on the hoot vent flow that way by pointing the air from the front out the top.
By removing the fins, you are creating air turbulence on the top of the hood. What happens is that some of the outside air tries to push down into the empty space, while the hot air inside is trying to get out.
The net effect is that the hot air that passed through the intercooler and radiator no longer goes out the top, and instead stays trapped on the lower part of the engine bay. At the same time, some cooler air gets shoved down from the top, but not enough to offset the lowered efficiency and higher temperatures of the radiator and intercooler.
Now since you're moving forwards, if you remove the vent fins then the cooler air ends up entering the vent and going backwards once it enters the hole, so it would likely be mostly cooling the top of the engine and going backwards. There would be some air turbulence inside, of course, mixing some hot and cool air together. But since air is being pushed in, the hot air that is already there stays mostly in the lower areas around the radiator/intercooler. It gets cooled off a bit due to the cooler air being around, but the idea of the intercooler and radiator is to pass air AS FAST AS POSSIBLE through them, not to create obstructions by creating a high pressure area behind them.
Even if you had a wall of cool air behind the intercooler and radiator, if it is blocking the air passing THROUGH them by pushing air the wrong way in, your radiator and intercooler temperatures WILL increase.
So, just to make the logic simple, it would be even better if you could put a fan pointing outwards to replace the fins, so that hot air is EXHAUSTED or blown out of the vent, thus drawing the hot air that just passed the intercooler and radiator out. You do NOT want to be trying to push air INTO the vent.
The ONLY time removing the hood vent might help is if you're sitting idle. But then, if you've just finished a race, open the hood up and you'll get 100 times better cooling, and you won't be sacrificing the functional air vents.
I've heard too much false info about this in the past, and this info is legit. If you think about what I said, it makes perfect sense and is why Mitsu engineers put it there.
Newbie
Joined: Jul 2006
Posts: 62
Likes: 0
From: Houston/College Station
HAHA niceeeee 
https://www.evolutionm.net/forums/sh...highlight=vent
https://www.evolutionm.net/forums/sh...highlight=vent
and this was just off the first page of a 7 page list when i searched "vent"
https://www.evolutionm.net/forums/sh...highlight=vent
https://www.evolutionm.net/forums/sh...highlight=vent
and this was just off the first page of a 7 page list when i searched "vent"
Last edited by pers785; Dec 14, 2006 at 01:15 PM.
Think about it... how does the air flow?
The point of the hood vent is to move the hot air that passes through the intercooler and radiator out the top. That is why the "fins" on the hoot vent flow that way by pointing the air from the front out the top.
By removing the fins, you are creating air turbulence on the top of the hood. What happens is that some of the outside air tries to push down into the empty space, while the hot air inside is trying to get out.
The net effect is that the hot air that passed through the intercooler and radiator no longer goes out the top, and instead stays trapped on the lower part of the engine bay. At the same time, some cooler air gets shoved down from the top, but not enough to offset the lowered efficiency and higher temperatures of the radiator and intercooler.
Now since you're moving forwards, if you remove the vent fins then the cooler air ends up entering the vent and going backwards once it enters the hole, so it would likely be mostly cooling the top of the engine and going backwards. There would be some air turbulence inside, of course, mixing some hot and cool air together. But since air is being pushed in, the hot air that is already there stays mostly in the lower areas around the radiator/intercooler. It gets cooled off a bit due to the cooler air being around, but the idea of the intercooler and radiator is to pass air AS FAST AS POSSIBLE through them, not to create obstructions by creating a high pressure area behind them.
Even if you had a wall of cool air behind the intercooler and radiator, if it is blocking the air passing THROUGH them by pushing air the wrong way in, your radiator and intercooler temperatures WILL increase.
So, just to make the logic simple, it would be even better if you could put a fan pointing outwards to replace the fins, so that hot air is EXHAUSTED or blown out of the vent, thus drawing the hot air that just passed the intercooler and radiator out. You do NOT want to be trying to push air INTO the vent.
The ONLY time removing the hood vent might help is if you're sitting idle. But then, if you've just finished a race, open the hood up and you'll get 100 times better cooling, and you won't be sacrificing the functional air vents.
I've heard too much false info about this in the past, and this info is legit. If you think about what I said, it makes perfect sense and is why Mitsu engineers put it there.
The point of the hood vent is to move the hot air that passes through the intercooler and radiator out the top. That is why the "fins" on the hoot vent flow that way by pointing the air from the front out the top.
By removing the fins, you are creating air turbulence on the top of the hood. What happens is that some of the outside air tries to push down into the empty space, while the hot air inside is trying to get out.
The net effect is that the hot air that passed through the intercooler and radiator no longer goes out the top, and instead stays trapped on the lower part of the engine bay. At the same time, some cooler air gets shoved down from the top, but not enough to offset the lowered efficiency and higher temperatures of the radiator and intercooler.
Now since you're moving forwards, if you remove the vent fins then the cooler air ends up entering the vent and going backwards once it enters the hole, so it would likely be mostly cooling the top of the engine and going backwards. There would be some air turbulence inside, of course, mixing some hot and cool air together. But since air is being pushed in, the hot air that is already there stays mostly in the lower areas around the radiator/intercooler. It gets cooled off a bit due to the cooler air being around, but the idea of the intercooler and radiator is to pass air AS FAST AS POSSIBLE through them, not to create obstructions by creating a high pressure area behind them.
Even if you had a wall of cool air behind the intercooler and radiator, if it is blocking the air passing THROUGH them by pushing air the wrong way in, your radiator and intercooler temperatures WILL increase.
So, just to make the logic simple, it would be even better if you could put a fan pointing outwards to replace the fins, so that hot air is EXHAUSTED or blown out of the vent, thus drawing the hot air that just passed the intercooler and radiator out. You do NOT want to be trying to push air INTO the vent.
The ONLY time removing the hood vent might help is if you're sitting idle. But then, if you've just finished a race, open the hood up and you'll get 100 times better cooling, and you won't be sacrificing the functional air vents.
I've heard too much false info about this in the past, and this info is legit. If you think about what I said, it makes perfect sense and is why Mitsu engineers put it there.
Newbie
Joined: Jul 2006
Posts: 19
Likes: 0
From: Las Vegas
EDIT: Dang, I shouldv'e looked at the thread post dates before asking!
way to go with bringing a thread back from the dead
good reading though so i'm thankful you did.
Evolved Member
iTrader: (5)
Joined: Sep 2006
Posts: 609
Likes: 1
From: Long Island, NY (Hurry up and wait)
The guys at MITSU got it right. It draws hot air out and is beneficial to cooling the engine bay. But hey alot of guys take it off for aesthetics and thats cool too.....but its there for a reason.....and the louvers are angled they way theyre supposed to be. The designers dont always get it wrong. Water will get in there either way on or off so forget about that.