Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB
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Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB (https://www.ft86club.com/forums/index.php)
-   Cosmetic Modification (Interior/Exterior/Lighting) (https://www.ft86club.com/forums/forumdisplay.php?f=36)
-   -   Custom Hood vs Hood Duct (https://www.ft86club.com/forums/showthread.php?t=124720)

norcalpb 01-18-2018 12:50 AM
Quote:
Originally Posted by gtengr (Post 3029429)
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.
Don’t our cars come with rubber vents in the area you are circling?

Brink 01-18-2018 01:20 AM
Quote:
Originally Posted by Pat (Post 3029328)
Defeats the purpose? What is the purpose?
To look like carbon fiber of course. Gotta show off that nice CF weave.

humfrz 01-18-2018 02:39 AM
Hello OP ....... you still with us ....??


humfrz

humfrz 01-18-2018 02:41 AM
Quote:
Originally Posted by Pat (Post 3029328)
Defeats the purpose? What is the purpose?
Yep, I'm still waiting for that since post #2.

:iono:


humfrz

Kodename47 01-18-2018 05:04 AM
Quote:
Originally Posted by gtengr (Post 3029416)
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.
This was proven years ago on here, probably find the threads if you have a look about.

Lunatic 01-18-2018 09:54 AM
Quote:
Originally Posted by gtengr (Post 3029429)
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.
I see what your saying.

Pat 01-18-2018 11:36 AM
Quote:
Originally Posted by Brink (Post 3029501)
To look like carbon fiber of course.
Believe it or not, the original purpose of carbon fiber was not to be used as automotive jewelry. I wouldn't assume everyone thinks that is of course its purpose.

gtengr 01-18-2018 09:31 PM
Quote:
Originally Posted by norcalpb (Post 3029486)
Don’t our cars come with rubber vents in the area you are circling?
I looked at it today but didn't look closely at the edges. I think I know what you're talking about but I'll have to reinspect. The cowl trim piece serves as a big inlet chamber for the HVAC, so any venting except for the very edges would get sucked into the cabin.

gtengr 01-18-2018 09:32 PM
Quote:
Originally Posted by Kodename47 (Post 3029551)
This was proven years ago on here, probably find the threads if you have a look about.
I searched a few variations of "windshield cowl" and couldn't find anything.

chaoskaze 01-18-2018 10:13 PM
Quote:
Originally Posted by Leonardo (Post 3029348)
@Tcoat :thumbsup:



What about cutting the side fender open into engine bay.... I know those are not that effective but it should work to a certain point too? :threadjacked:

Gunman 01-18-2018 10:35 PM
1 Attachment(s)
Quote:
Originally Posted by gtengr (Post 3029416)
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.
Cowl/base of windscreen, is a high pressure area.

Lunatic 01-18-2018 10:40 PM
1 Attachment(s)
Quote:
Originally Posted by chaoskaze (Post 3030071)
@Tcoat :thumbsup:



What about cutting the side fender open into engine bay.... I know those are not that effective but it should work to a certain point too? :threadjacked:
Like I did.

gtengr 01-19-2018 01:17 AM
Quote:
Originally Posted by Gunman (Post 3030090)
Cowl/base of windscreen, is a high pressure area.
I saw that model and I don't think it's detailed enough to check. I've already discarded the idea due to HVAC interference, but you realize the vent would be recessed under the back of the hood about 4 inches or so towards the front? And the CFD model doesn't consider the radiator airflow, which is the target of the venting. If airflow into the engine compartment is high enough, the firewall can create a high pressure zone too. I'm guessing that is what makes the hood dance at speed.

humfrz 01-19-2018 01:33 AM
1 Attachment(s)
Quote:
Originally Posted by chaoskaze (Post 3030071)
@Tcoat :thumbsup:



What about cutting the side fender open into engine bay.... I know those are not that effective but it should work to a certain point too? :threadjacked:
If I recall proper, that had been tried .....;)


humfrz


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