Custom Hood vs Hood Duct

[Launcher]

Opinions on the difference between hood duct and custom hood with built in hood duct type.

I was looking at the TS- Style Siebon
http://seiboncarbon.com/tsii-style-c...ubaru-brz.html

Currently in stock

I would need to buy that, have someone paint it black OEM color for my Subaru BRZ so could see it adding up cost fast but if it is worth it and makes a difference in look compared to the hood duct I would be fine with it.

I have never had a custom hood or hood duct on a car so curious on that as well. I see several hood ducts that I assume a car shop could just add to my current hood?

Something like the following:
https://shop.namelessperformance.com...d-duct-system/


Thoughts and main differences between the two or am I way off?

Leaning towards the Siebon TS-Style hood but want to make sure when I buy it I can get someone to pain the carbon fiber and fitted and have no issues.

[humfrz]

Originally Posted by Launcher

Opinions on the difference between hood duct and custom hood with built in hood duct type.


Thoughts and main differences between the two or am I way off?

Well, Launcher, I must ask ....... why do you want either one ..... ??

* to make the hood lighter ..??

* to allow hot air to escape the engine compartment .. ??

* to look cool ..... cause CF ..??

* other


humfrz

[StraightOuttaCanadaEh]

From an aesthetic standpoint, I would go for the carbon variety, paint it, and leave the carbon louvres unpainted. Then again, it's always form>function for me. My two cents

[NRXRaptor]

If you are going to paint a carbon fiber hood it defeats the purpose to me. From what I know most consumer level carbon fiber bits are carbon fiber molded/stuck onto a hood shaped piece of fiberglass. My 2 cents

[daskaman]

Factory hood is surprisingly light for what it is.

Unless you have other reasons for wanting to switch, or just a different look.

[Leonardo]

These look cool! About half the price of a hood.


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There are more options... Some that look sleeker...
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My $0.02 I live in Oregon. My louvered hood let water sit on my engine and corroded the aluminum parts which made them look terrible. (different car)

[Pat]

Originally Posted by NRXRaptor

If you are going to paint a carbon fiber hood it defeats the purpose to me. From what I know most consumer level carbon fiber bits are carbon fiber molded/stuck onto a hood shaped piece of fiberglass. My 2 cents

Defeats the purpose? What is the purpose?

[gtengr]

Has anyone drilled holes in the windshield cowl? Seems like it would be a good stealth way to vent the engine compartment.

[Leonardo]

Originally Posted by gtengr

Has anyone drilled holes in the windshield cowl? Seems like it would be a good stealth way to vent the engine compartment.

[ame="https://www.youtube.com/watch?v=G3ja6Hn8ps4"]https://www.youtube.com/watch?v=G3ja6Hn8ps4[/ame]

[Pat]

Originally Posted by gtengr

Has anyone drilled holes in the windshield cowl? Seems like it would be a good stealth way to vent the engine compartment.

The cowl is not a low pressure zone. That would provide no benefit. Often what "seems like" would work does not. This is especially true with aerodynamics.

[Lunatic]

Originally Posted by gtengr

Has anyone drilled holes in the windshield cowl? Seems like it would be a good stealth way to vent the engine compartment.

This is actually a high pressure area. Ever hear of "Cowl Induction"?

I bought this Mustang hood vent off e-bay for 90 bucks.

[gtengr]

Originally Posted by Pat

The cowl is not a low pressure zone. That would provide no benefit. Often what "seems like" would work does not. This is especially true with aerodynamics.

The cowl piece is shielded from airflow, so I think that's debatable. I think it's likely a low pressure area exists in the airflow void where the vents would be. Also need to consider there is an underhood pressure component, and the underhood air is hotter. Seems you should know that once you cut a vent into something that the pressure zones can easily change and need to be reanalyzed.

[gtengr]

Originally Posted by Lunatic

This is actually a high pressure area. Ever hear of "Cowl Induction"?

Yes, but they project upwards from the rear hoodline and towards the windshield to ensure the rear opening gets into the high pressure zone, and this is typically done to cars that aren't as streamlined and have an abrupt hood to windshield transition that helps to more clearly create a high pressure area. I'm not saying it would positively work, but I don't think it can be so simply dismissed.

[gtengr]

Here's an example of what I'm thinking about using the 2019 ZR1. Ignore for a second that its hood vent caused a dramatic change to the high pressure zone in the center of the windshield. Just look at the area I zoomed in on and notice how the high pressure area on the windshield ends at roughly the height of the back of the hood, and what's under that point is low pressure.