My $2.37 Hood vent modification w/pictures

[firebirdvert305]

Well I had the day off woke up early and decided to do some changes to the car. All this reading on rice over wheat custom jobs and greyforests custom vent jobs, I decided to do my own for two reason. Reason number one was clearance, I had very little clearance running my external wastegate off #1 with it hitting the hood, so before it would of got a chance to discolor it, I decided to make a custom hood vent. The second reason was I didnt think it would hurt too bad to try and lower underhood cooling temps. Right underneath the hood, above the exhaust manifold you can see almost a perfect section of metal to cut, there is ribs on 1gb cars on the hoods (i believe 1ga is different but not 100% sure) but theres a section perfectly where you can cut and its outlined by the ribs on the hood. The pics I shot were off a cell phone and is not the greatest pics, if you guys are truly interested in it, I can get high quality pics if need be. I also plan on doing a custom CAI setup for the car as well where it will be drawing in fresh air through the front passanger headlight via the high beam. The 2.37 cent cost of this mod was the cost for the weatherstripping I picked up at Advance auto parts store. I can tell you right now im no rocket scientist but I know this is an effective mod, you can see a mirage of heat coming from the hood when in stop and go traffic, and cooling temps seem to be getting "cooler quicker". All in all I dont think it looks too bad, very cost effective mod and serves a great purpose. Any comments and questions are welcome.

http://imageigloo.com/viewer.php?id=8933vent.jpg

http://imageigloo.com/viewer.php?id=2876vent1.jpg

http://imageigloo.com/viewer.php?id=477vent2.jpg

http://imageigloo.com/viewer.php?id=4616vent3.jpg

 

[Xeiros]

It doesn't look bad, but I think it would have looked a bit better if it was evened out (as in same lenght from one end of the hood to the other.


In the end though function > design

 

[Byrd]

Ghetto ..... Sorry man.

A Koyo might have been your friend

 

[Rice Over Wheat]

A koyo alone doesn't do a whole lot but bring your radiator closer to the exhaust components' radiant heat. Hood vents always help heat escape.

I wondering if you finished it Steve, see I told you it was easy. Maybe if you can post some better pics, it's tough to make out. That style vent might look good with a low profile cf cover on it like many 1Gs do. It also makes it more effective while the car is moving.

 

[2gAWDTalon]

That ish is baller

 

[95blackGsTurbo]

Pretty ghetto looking. Now someone can steal stuff without opening your hood. You could just run a headshield over your exhaust manifold and that would help with underhood and cooling temps. a ton. Also a rad. will help dispurse the head better as well. I dropped 11* with my new rad.

 

[VanIsleDSM]

That's pretty ghetto, not hacked up as much as some I've seen though..

A car's like a girl you're into, if her insides are all really nice but she's butt ass ugly, it's not going anywhere.. she doesn't have to be a 10 if she's the right person.. but it's not gonna work unless she's at least somewhat attractive..

To stick with my analogy here.. If I ripped off my girlfriend's legs (which can get in the way) she would be more functional, however.. in this case function follows form.. I'd rather have the legs there.. just like I rather have an entire hood.

Another interesting thing to bring up for discussion..
I don't think a vent near your exhaust manifold is a good thing at all, the best place for heat to escape from the exhaust is the tailpipe.. you don't want a rush of air blasting on your manifold.. you want to retain all the heat you can inside of it.. insulate it, to keep it hotter inside, so it gives off less heat.. that's the way to do it.. not cool it with oncoming air.. you're taking away you're exhaust velocity..

 

[firebirdvert305]

Pretty ghetto looking. Now someone can steal stuff without opening your hood. You could just run a headshield over your exhaust manifold and that would help with underhood and cooling temps. a ton. Also a rad. will help dispurse the head better as well. I dropped 11* with my new rad.

What can they possibly steal? You cant get your arms/fingers, any sort of tool in close enough to pop the hood. The only way theyd be able to steal the wastegate is w/a cutting torch. Thanks for the comments, it didnt hurt spoolup topend midrange what so ever, it still spins into 3rd gear, and still dissapates heat better then it was.

 

[Ludachris]

Venting the hood on a turbocharged car is almost critical for underhood temps. You can exhaust all of the other tricks to help keep things cool but nothing will allow hot air to escape from under the hood unless you vent it. Venting also helps your radiator do its job better.

Whether or not you like the way this guy did his venting, that's up to you. Look at any
(turbocharged) race car and chances are you'll see hood vents of some type. If you don't plan to run your car hard very much it might be a non issue.

 

[Ludachris]

I don't think a vent near your exhaust manifold is a good thing at all, the best place for heat to escape from the exhaust is the tailpipe.. you don't want a rush of air blasting on your manifold.. you want to retain all the heat you can inside of it.. insulate it, to keep it hotter inside, so it gives off less heat.. that's the way to do it.. not cool it with oncoming air.. you're taking away you're exhaust velocity..

You're thinking in terms of heat inside the manifold/engine. It's the heat outside of the manifold in your engine bay that needs to escape, and it won't exit through the tail pipe. Trying to keep the underhood temps down isn't going to affect your exhaust velocity. Take a look at most cars in pro sports car racing, they all vent their hoods to keep temps low under the hood. You can wrap your manifold and turbine housing to help exhaust velocity but you still have to try and keep the temps down outside of the manifold somehow - venting is the best way to do it.

And you're not going to get a rush of air on your manifold with a hood vent. The air will go through the radiator and escape through the vent. Air won't be rushing in through the vent.

 

[dsm-onster]

That's pretty ghetto, not hacked up as much as some I've seen though..

A car's like a girl you're into, if her insides are all really nice but she's butt ass ugly, it's not going anywhere.. she doesn't have to be a 10 if she's the right person.. but it's not gonna work unless she's at least somewhat attractive..

To stick with my analogy here.. If I ripped off my girlfriend's legs (which can get in the way) she would be more functional, however.. in this case function follows form.. I'd rather have the legs there.. just like I rather have an entire hood.

I'm on the floor!!! my God, that was so funny.

but makes total sense. My wife wouldn't really be in the mood if I ripped her legs off anyway !

But he might think she's better looking like that .

I don't though. I'll bet your girlfriend looks better w/ legs, too . I don't like the grey forrest vent mod either. . .

 

[Rice Over Wheat]

That's pretty ghetto, not hacked up as much as some I've seen though..

A car's like a girl you're into, if her insides are all really nice but she's butt ass ugly, it's not going anywhere.. she doesn't have to be a 10 if she's the right person.. but it's not gonna work unless she's at least somewhat attractive..

To stick with my analogy here.. If I ripped off my girlfriend's legs (which can get in the way) she would be more functional, however.. in this case function follows form.. I'd rather have the legs there.. just like I rather have an entire hood.

Another interesting thing to bring up for discussion..
I don't think a vent near your exhaust manifold is a good thing at all, the best place for heat to escape from the exhaust is the tailpipe.. you don't want a rush of air blasting on your manifold.. you want to retain all the heat you can inside of it.. insulate it, to keep it hotter inside, so it gives off less heat.. that's the way to do it.. not cool it with oncoming air.. you're taking away you're exhaust velocity..

Wow...just wow. And now I know why you are stock. Please don't add even an air filter to that car lest you strain your most vital muscle.

Steve, looks are always subjective so ignore the negative comments on aesthetics. And I'm sure you know by now those who are knowledgable and those who don't have a clue.

 

[DSMunknown]

I'm on the floor!!! my God, that was so funny.

but makes total sense. My wife wouldn't really be in the mood if I ripped her legs off anyway !

But he might think she's better looking like that .

I don't though. I'll bet your girlfriend looks better w/ legs, too . I don't like the grey forrest vent mod either. . .

^^ Times two. I hate the Greyforest mod. Looks like shat. Sorry Kevin, but this is just one big brain fart to me. For those of you that have it, there was something in the August '04 issue of Modified Mag that peaked my interest and reminded me of something I have seen before.

The section between the firewall and the back of the hood can be increased, allowing for more airflow out of the engine bay while keeping the OEM appearence. Hopefully someday something like this will be available for DSMs.

I have seen this done for other vehicles (mostly for trucks, from what I've seen), so I'm sure it won't be that much of an issue for us. Perhaps some trimming here-and-there is all it takes, and an air duct here-and-there. Just a thought.

 

[the_skin_eater]

I dont know man...A chic with no legs is pretty hot...
Id hit it.




And throw something over that vent...Knowing my luck a bird would fly in there.... Or a squirrel.. Had them jump out when I started the car before.

Oh yea..The above post made me remember this...

Im just gonna shim the back of my hood up. Like a small getto cowl induction or whatever...Then Im gonna fab up my fenders to compensate for the gap on the sides...An inch in the back isnt much, but it should allow for better flow around there...Maybe Ill run a temp gauge for a while before, then after...

Its down the road though...

 

[dsm-onster]

^^ Times two. I hate the Greyforest mod. Looks like shat. Sorry Kevin, but this is just one big brain fart to me. For those of you that have it, there was something in the August '04 issue of Modified Mag that peaked my interest and reminded me of something I have seen before.

The section between the firewall and the back of the hood can be increased, allowing for more airflow out of the engine bay while keeping the OEM appearence. Hopefully someday something like this will be available for DSMs.

I have seen this done for other vehicles (mostly for trucks, from what I've seen), so I'm sure it won't be that much of an issue for us. Perhaps some trimming here-and-there is all it takes, and an air duct here-and-there. Just a thought.

Absolutely a good option IMHO. It's like a stock looking cowl hood, correct?

 

[DSMunknown]

Absolutely a good option IMHO. It's like a stock looking cowl hood, correct?

Bingo.

 

[dsm-onster]

I dont know man...A chic with no legs is pretty hot...
Id hit it.

Well she couldn't kick but . . .

And throw something over that vent...Knowing my luck a bird would fly in there.... Or a squirrel.. Had them jump out when I started the car before.

Or a bat. . . I've had a bat fly into my homemade cold air intake. . . I'm all for homemade though. So don't let my opinion about his mod steer you. Unless you care about our asked for opinions. . . Nevertheless. It should vent fine otherwise, IMHO.

Im just gonna shim the back of my hood up. Like a small getto cowl induction or whatever...Then Im gonna fab up my fenders to compensate for the gap on the sides...An inch in the back isnt much, but it should allow for better flow around there...Maybe Ill run a temp gauge for a while before, then after...

Its down the road though...

Why not just custom build a hood instead. . .???

 

[Xeiros]

Another interesting thing to bring up for discussion..
I don't think a vent near your exhaust manifold is a good thing at all, the best place for heat to escape from the exhaust is the tailpipe.. you don't want a rush of air blasting on your manifold.. you want to retain all the heat you can inside of it.. insulate it, to keep it hotter inside, so it gives off less heat.. that's the way to do it.. not cool it with oncoming air.. you're taking away you're exhaust velocity..

WTF

Uh...no. If it wasn't a good thing at all, why the hell would Evo's come with one right out of the factory, or why would lots of race inspired cars have one, or NACA ducts? It helps eliminate under hood temps created by the turbo/exhaust main/engine, and it helps the radiator do it's job more efficiently by creating a channel for all that air coming through it to escape.

--edit--

Ok, well Ludachris said practically the same thing I said first, so x2

 

[TwoLiterLaser]

Seems to me that a home-made hood vent is one of the best things a DSM man could do. It is cheap, takes some weight off of the front of your huge-front-bias chassis, lowers your under-hood temps, and it is a unique mod that distinguishes your car from every other stock DSM in the world.

I especially like your vent, firebirdvert305, because it is not exaclty symetrical, whereas almost all other vents are. Ignore the pretty boys, they probably own Honda's.

 

[dsm-onster]

WTF

Uh...no. If it wasn't a good thing at all, why the hell would Evo's come with one right out of the factory, or why would lots of race inspired cars have one, or NACA ducts? It helps eliminate under hood temps created by the turbo/exhaust main/engine, and it helps the radiator do it's job more efficiently by creating a channel for all that air coming through it to escape.

--edit--

Ok, well Ludachris said practically the same thing I said first, so x2

I believe the EVO hood vent is for a different function. . . Function over form, right? But still, an EVO hood looks better. Yes, if you're going to add a hood vent look at our bretherin examples. . .

 

[JohnCIV_Talon]

If I were you I would even it out and put some kind of mesh in it, give it a better, cleaner look.

 

[Ludachris]

I believe the EVO hood vent is for a different function. . . Function over form, right? But still, an EVO hood looks better. Yes, if you're going to add a hood vent look at our bretherin examples. . .

What other function would the EVO hood vent be made for besides allowing hot air to escape?

 

[Rice Over Wheat]

^^ Times two. I hate the Greyforest mod. Looks like shat. Sorry Kevin, but this is just one big brain fart to me. For those of you that have it, there was something in the August '04 issue of Modified Mag that peaked my interest and reminded me of something I have seen before.

Sorry, but the logs prove the effectiveness of all my cooling mods, each of which was progressively added one by one. There's no arguing with real world results, the only thing that I care about. If you can't see the effectiveness of hood vents there is no helping you as this is very simple logic. And again, remember that looks are not the goal here, maximim cooling is. Nor is the goal to please your particular taste in aesthetics when the majority of people I know really like it. Try running a fmic and bigger turbo setup and you'll find temps to be a serious power sapping issue.

And btw, removing the seal at the back of the hood has already been addressed, I believe by Defiant and others. It's a low pressure area and without hood vents the air is pulled down the bottom of the engine bay by the road surface rushing below it. Now consider how radiator bumper vents combine with hood vents regarding air flow while the car is at speed.

 

[Byrd]

A koyo alone doesn't do a whole lot but bring your radiator closer to the exhaust components' radiant heat. Hood vents always help heat escape.

I wondering if you finished it Steve, see I told you it was easy. Maybe if you can post some better pics, it's tough to make out. That style vent might look good with a low profile cf cover on it like many 1Gs do. It also makes it more effective while the car is moving.

You want low under-hood temps because it affects coolant and intake temps ya?

Well, I dropped my coolant temps 30* and my intake temps 40* with a koyo and a $25 CAI w/o going under surgery. I drive with 176-183 coolant temps all day. While it's more expensive it looks a ton better and is more effective. Fiberglass/Carbon fiber hood with RRE vents FTW

 

[Rice Over Wheat]

What other function would the EVO hood vent be made for besides allowing hot air to escape?

Exactly right. And for reference, here's an excerpt regarding the Evo 8 changes vs the Evo 7 for more efficient cooling and ultimately better performance through lower engine temps. My comments are in RED:

http://www.webwombat.com.au/motoring/news_reports/mitsubishi-evo-8.htm

It also features significant advances in aerodynamic and cooling performance that has been gained from extensive testing during development on the Nurburgring in Germany, and in Mitsubishi's own advanced wind tunnel facility. [hmm...engineering?]

The company has also gained important feedback obtained from the Evolution's participation in the WRC and other rally events, and intercooler efficiency has been improved as well, which translates directly into engine performance, boosted thanks to a 10% enlargement of the mid-bumper air intake. [ie cutting the bumper to expose the fmic]

Reducing drag and lift, Evolution VIII's exterior lines give it better high speed straight line stability and handling through corners than its predecessor.

The design also achieves the increased cooling performance necessary to extract the full potential of the model's engine and drivetrain. [cool = power; more timing]

The radiator cooling air intakes in the front grille have been slightly reduced in size to lower drag. But this won't affect engine performance as the hot air extraction vents in the engine hood are 60% larger than on Evolution VII, and with an improved heat protector design, they effectively double the area. [bumper radiator vents + hood vents = heat removal of engine bay]

Extraction efficiency has also been improved by moving the vents 40mm forwards and by adding a kickup to the leading edge to generate more negative pressure (vacuum). As well as reducing drag and front lift, these detail improvements also boost the radiator/intercooler cooling performance.

The side air vents on Evolution VII have been eliminated to reduce drag and weight, and to allow the hood vents to be increased to the maximum size permissible under WRC regulations. [hood vents hood vents hood vents]

And that was one of the things that I noticed most of the Evo VI - heat build-up.

If not for the bonnet vents, the engine cylinder heads would cook, and after enthusiastic driving, you could even see the exhaust headers glowing orange. The 60% increased vent size, then, will help with endurance, allowing the Evo VIII to go harder for longer. [vents = better cooling = less engine heat = more performance]