vented stock hood?

figgie

Supramania Contributor
Mar 30, 2005
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taka21;1447021 said:
im not sure what you mean by this comment
i was not aware that finding innovative ways to achieve practical and beneficial goals such as lowering under hood temperatures and assisting the radiator in its function, when dealing with our cars was a non productive hobby

please elaborate on what a productive hobby means to you
im very interested


let me get this straight

Toyota with their R&D department to include wind tunnel testing and countless of million of dollars spent, did not come up with good air flow, but yet, these holes are cut arbitrarily with no rhyme or reason by said aftermarket companies, but no one knows if it infacts helps in aerodynamics through the radiator, venting the heat from under the hood etc?

give me a break.
 

Poodles

I play with fire
Jul 22, 2006
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Come on figgie, you know why they didn't do it...

- Rain (have to make gutters and crap)
- Looks
- Cost

The detuned rally cars (Evo, STI) run them for a reason...
 

7M-KDL

Seeking high numbers
no offense but figgie with your argument you rule out the need to do any modding to the car. i mean if it was supposed to be done the factory would have done it right. for example:
-lowering
-intake
-exhaust
-metal head gasket
-more boost
im not trying to be a dick or say that you are wrong bc a lot of people do cut stupid holes for no reason but i find it hard to believe that the stock design is the most beneficial. besides, i just felt like posting
 

supra13's

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Oct 20, 2009
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Mine is actually a CAI, I'm building an air duct and air box to mount the filter in. The hood will seal against the top of the air box when closed. Ram air affect. Kinda shitty pic, (damn cheap dig cam)
 

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taka21

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Feb 16, 2008
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supra13's;1448143 said:
Mine is actually a CAI, I'm building an air duct and air box to mount the filter in. The hood will seal against the top of the air box when closed. Ram air affect. Kinda shitty pic, (damn cheap dig cam)

thats pretty interesting
 

figgie

Supramania Contributor
Mar 30, 2005
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7M-KDL;1447154 said:
no offense but figgie with your argument you rule out the need to do any modding to the car. i mean if it was supposed to be done the factory would have done it right. for example:
-lowering
-intake
-exhaust
-metal head gasket
-more boost
im not trying to be a dick or say that you are wrong bc a lot of people do cut stupid holes for no reason but i find it hard to believe that the stock design is the most beneficial. besides, i just felt like posting

since you asked, (and be prepared, it will not be nice).

they did.

lowering, i know the lot of you love to lower the cars with no regards to how it actually affects the suspension geometry. You know, especially the addition to negative camber that gets so screwed up you look like you are racing at the daytona speed way turning in both directions with no way to get it remotely close to even normal. Hooray tire wear!

Intake - Oh you mean the Q45 on/off switch off a mod? No? How about the place the intake right of the hot air discharge of the radiator? Perhaps that is the one you are talking about. Or even the better one, getting rid of EGR so it does not leave that carbon film in the nice shiney intake? lol

Exhaust - Quiet, loud, those are choices. free up HP? Correct phrase is moving the powerband to the right.

Metal Head gasket - ahh the old 7m is a BHG monster. 135k miles on OEM (out of 225k miles) with out one problem. Guess I am the exception to the rule of BHG, I keep on being lots of exception to lots of rules......

More boost - anyone actually ever take IAT temps when using the CT26 above the OEM setting? Let see them, both pre IC and post IC? anyone? Bueller? I was running more boost in my car, except not on that CT26 pea shooter, I was using a TD06-20g from greddy, except like most people that up the boost and do no work before that, I actually did some work to make sure that I was not another "side of the road story" which in the 12 years of the car being my one and only DD (that means through snow, high elevations, sea level altitude, humidity changes in 2 hours etc), it never ever did.

So yes. I prefer mods that have some verifiable and repeatable fuctionality. Not the, "hey, it is bigger so I must be better" or "lets cut a hole here and lets hope for the best" without any rhyme or reason to the mod. ;)
 

iwannadie

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Jul 28, 2006
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Poodles;1447143 said:
Come on figgie, you know why they didn't do it...

- Rain (have to make gutters and crap)
- Looks
- Cost

The detuned rally cars (Evo, STI) run them for a reason...

On the jeep forums this comes up a lot and people run these giant hood vents and swear water isn't an issue. I've always wondered what effects being parked in a rain storm has on things under the hood.

How do factory air scoops/vents deal with rain? Is there an actual under hood gutter that guides the water away from anything important? Will driving in a down pour with vents letting water pour onto the motor be a big problem? Or, does the wind suck the water away fast enough to not be an issue at driving speeds?
 

7M-KDL

Seeking high numbers
figgie;1449275 said:
since you asked, (and be prepared, it will not be nice).

they did. etc etc(as not to repost what youve already said.

my point was not that every thing everyone does is beneficial. my point is that the factory doesnt always do things the best way. also, since you mentioned the BHG, mine was good until 132K miles and it has been taken care of pretty well. i dont mean to start a big argument. i dont plan on cutting holes all over my car.

to address the lowering/negative camber: camber plates? or just dont make the car stupid low? if lowering/stiffer springs isnt beneficial(not necessarily for the street but it has is place) then why do people who race do it. to reduce body roll right and help with grip?

as for intake: are you one of the "mega dirt flow" air filter guys who prefer the stock paper i cant remember(some people have different opinions and i cant remember if you were ones of them that has posted that before) also, i dont plan to, nor recommend removing the egr unless of course you have an ecu that is made to run without it.

exhaust: depending on what you're doing moving the powerband is beneficial

oh, and..boost: i know you cannot simply turn up the boost and everything will be awesome. the list i made was just to get the idea not the entire list of mods needed to do all that is needed, sorry if it came off that way. however, the ct26 isnt the smallest turbo and can make good power, especially and upgraded one, with supporting mods like a larger intercooler, meth injection, and/or a cryo kit

back to my main point, while the factory is sometimes good it is not always the best, especially depending on what you plan to do with the car. IE: drift, drag, street, autox etc..

and figgie im not arguing with you bc i agree that a lot of people just do things without actually testing or seeing that they get any gains.



iwannadie and anyone else who reads: dont take me saying this as me being all knowing or anything like that. to answer your question, from my experience, water is not a big issue for the under hood area. everything is pretty much waterproof. obviously if you have a large vent right over your airbox it is not a good thing. you think that just because there is a hood that no water gets in when youre driving down the road? water is going to come into the engine bay unless you have the whole underside covered and seals all the way around. as i said, its pretty much water proof anyway. i have cleaned and sprayed a hose in many engines bays to clean off grease(mostly rinse off the degreaser) and i had an old jeep with a hood scoop as a DD and never had any problems with water. a lot of people may disagree but unless there is some proof, my experience says its fine. maybe im just lucky, maybe my luck will run out. maybe someone else can shed some light on the subject

edit: some manufacturers make covers if they come vented from the factory. nissan had covers for the hood vents on the 280z
 

Poodles

I play with fire
Jul 22, 2006
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Sorry figgie, but the torque on a turbo car comes from the turbo, faster spool means a larger and broader torque band, not shifting it to the right.
 

figgie

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Mar 30, 2005
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Poodles;1449562 said:
Sorry figgie, but the torque on a turbo car comes from the turbo, faster spool means a larger and broader torque band, not shifting it to the right.


you better grab my trusty turbo flow calculator and recheck that thought as it shows what happens on a pressure ratio level, the very thing that the exhaust changes.

torque is still a function of the motor, "faster spool" or a turbo that comes online early in the rpms. only means that the pressure ratio is being acheived quicker which in turn means that the turbo will choke earlier which effectively moves the power band to the left. Slower spool means the pressure ratio is low at that given time that the turbo will not spool till later effectively moving the power band to the right.

There is no magic turbo that will work through the entire rev band of a motor, at least not yet.
 

Poodles

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Jul 22, 2006
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But you said it would move it to the right ;)

Not trying to be an ass, but the #1 reason the exhaust is the way it is on the supra is because of sound. As a luxury GT car it was expected to be quiet. Outside of that, it was cost and durability.
 

mattsplat72

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Jan 17, 2006
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Hey Poodles, Did you see the recent article in ...Shit I dont remember the mag.. It was either Import tuner of Superstreet. They actually tested the practice of shimmed hoods and it did infact lower temps by as much as 20 degrees.

I did it to see and I didn't like the extra amount of flex. granted it wasn't much but I didnt want to crack/ crinkle the paint so I flipped a bitch drove home and fixed it .
 

iwannadie

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Jul 28, 2006
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7M-KDL;1449556 said:
iwannadie and anyone else who reads: dont take me saying this as me being all knowing or anything like that. to answer your question, from my experience, water is not a big issue for the under hood area. everything is pretty much waterproof. obviously if you have a large vent right over your airbox it is not a good thing. you think that just because there is a hood that no water gets in when youre driving down the road? water is going to come into the engine bay unless you have the whole underside covered and seals all the way around. as i said, its pretty much water proof anyway. i have cleaned and sprayed a hose in many engines bays to clean off grease(mostly rinse off the degreaser) and i had an old jeep with a hood scoop as a DD and never had any problems with water. a lot of people may disagree but unless there is some proof, my experience says its fine. maybe im just lucky, maybe my luck will run out. maybe someone else can shed some light on the subject

edit: some manufacturers make covers if they come vented from the factory. nissan had covers for the hood vents on the 280z

Well regarding water getting directly on the top side of the motor, electronics usually don't do so well from my understanding. I've seen a lot of people spray down the engine bay with a garden hose and sudden have the TPS and the sorts fail.

Some people swear while driving they see water shooting up and out of the hood vents. So I can understand water spraying around a lot under the hood. Just when it has time to settle and seep into places I would think becomes a big problem. I wasn't sure if an OEM type vent would have anything special setup to handle rain water coming in. Or, if the vent just allows the water to pour in the open vent. Poodles comment about having to make gutters made me wonder as I've never seen under a hood with oem vents...
 

figgie

Supramania Contributor
Mar 30, 2005
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Poodles;1449806 said:
But you said it would move it to the right ;)

Not trying to be an ass, but the #1 reason the exhaust is the way it is on the supra is because of sound. As a luxury GT car it was expected to be quiet. Outside of that, it was cost and durability.


umm

it does. Turbos only work in a very specific rpm window, change pressure ratio and that window moves up or down on the turbo flow graph which coincides with the RPM of the motor hence it moves either left or right ;)

Especially since most everyone goes bigger, it has no choice but to move the power band to the right due to all the aforementioned variables ;)
 

CPT Furious

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5372070005_medium.jpg


Here is mine. Modified by a local hot rodder. He used a press and it only cost me $48 for the vents. I've been really happy with it. I've had better A/C, cooler temps (using a real water temp gauge and not the stocker), no heat soak issues, and they are far enough away that water and electronics isn't a real concern. There also is minimal increase in hood shimmy, but again it's minimal.
 

7M-KDL

Seeking high numbers
iwannadie;1450021 said:
Well regarding water getting directly on the top side of the motor, electronics usually don't do so well from my understanding. I've seen a lot of people spray down the engine bay with a garden hose and sudden have the TPS and the sorts fail.

Some people swear while driving they see water shooting up and out of the hood vents. So I can understand water spraying around a lot under the hood. Just when it has time to settle and seep into places I would think becomes a big problem. I wasn't sure if an OEM type vent would have anything special setup to handle rain water coming in. Or, if the vent just allows the water to pour in the open vent. Poodles comment about having to make gutters made me wonder as I've never seen under a hood with oem vents...

i don't know then. i have sprayed mine down multiple times and it didn't seem to do anything. also, i would think that while driving the engine will be hot enough that the water cannot settle. maybe i haven't had any issues bc i haven't let it sit with water on it. usually after i hose mine off i am driving it shortly after. as i said earlier...maybe im just lucky.
 

7M-KDL

Seeking high numbers
CPT Furious;1450335 said:
5372070005_medium.jpg


Here is mine. Modified by a local hot rodder. He used a press and it only cost me $48 for the vents. I've been really happy with it. I've had better A/C, cooler temps (using a real water temp gauge and not the stocker), no heat soak issues, and they are far enough away that water and electronics isn't a real concern. There also is minimal increase in hood shimmy, but again it's minimal.

bead roller? then welded in?
 

iwannadie

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Jul 28, 2006
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7M-KDL;1450337 said:
i don't know then. i have sprayed mine down multiple times and it didn't seem to do anything. also, i would think that while driving the engine will be hot enough that the water cannot settle. maybe i haven't had any issues bc i haven't let it sit with water on it. usually after i hose mine off i am driving it shortly after. as i said earlier...maybe im just lucky.

Well, like I said the problem I was most wondering about was when the car was parked in the rain... That's when the water has time to settle and seep into places on a cold motor was my thinking.