Hood Venting, NACA Ducts - Page 3 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

yomny · 02-04-2015, 07:39 PM

I think overheating needs to be addressed with maybe a bigger radiator and a fanned oil cooler. The vents help release underhood heat but I cant imagine them making such a big difference. I actually touched my charge pipe right before the TB and it was pretty damn hot, was thinking of gold wrapping it.

Thorpedo · 02-04-2015, 07:42 PM

Quote:

Originally Posted by Tromatic

All very nice. What overheating problems are you and OP having that you need to do this? Post oil temps pre and post mod if you have them.

So... what you're saying is there must be a prerequisite to do this mod? Namely oil temps? Lower under hood temps are nearly never a bad thing. On track my non-FI car saw coolant temps creep up a bit, it is possible this modification could help that. For what money he spent and the time he invested it seems like a great idea.

"My condolences" to you for being so traumatized by the fact that someone did what many see as a worthwhile mod. Your user name is even more fitting imo.

wheelhaus · 02-05-2015, 11:31 AM

Quote:

Originally Posted by Tromatic

All very nice. What overheating problems are you and OP having that you need to do this? Post oil temps pre and post mod if you have them.

I've not done the mod, but I've looked into it and a friend is considering it. He tracks his car FAR more than I do. Either way, underhood temps get pretty toasty from even normal driving. I believe venting the engine bay helps in three areas:
1- Reduce heatsoak at low speeds/stops, this is especially important to anyone with FI.
2- Reduce heat-related degradation of all the neighboring components. Plastics can only be baked and heat cycled so many times before them become embrittled.
3- Marginally improve overall cooling efficiency by allowing radiator airflow to escape more easily (this is speculative, albeit logical). If the fender vent is in a low pressure zone at speed, then it can act as a soft vacuum to suck out hot air. It's also near the highest point of the engine bay so the heat will naturally want to rise and exit.

yomny · 02-05-2015, 12:29 PM

I have only one concern right now with cutting the vents and is not cutting it. I've arrived at the maybe incorrect conclusion that in order to extract the air based on some stuff that i can't explain.. the low pressure high pressure stuff, the vent needs to be around the front part of the hood. As you get closer to the base of the windshield the low pressure area wont allow for maximum "pull" effect. Now i've located two slots right over the front part of the hood which sit between the fans and the engine.. but also sits right on top of my turbine housing and downpipe so when it rains. i may not like it.

Vents need to go around the red areas on the hood.

Dipstik-sportech · 02-05-2015, 04:30 PM

Neat pretty much where mine are!

Lunatic · 02-05-2015, 05:15 PM

I don't really know how much my fended vents help, if any, as I added a oil cooler and tranny cooler at the same time. What I can say is my engine oil and tranny fluid both stay below 230 degrees on the track and when pulling into the pits you can really feel the heat coming out of the vents. I'm sure they didn't do any harm. And I think they look pretty good.

yomny · 02-05-2015, 09:24 PM

I'm sure any vent in any location will help, so there's no wrong placement.

Davf24 · 02-05-2015, 10:20 PM

Quote:

Originally Posted by Lunatic

Let engine heat escape. works really nice.
I got BRZ inserts, cut them out and installed gold painted mesh to match my gold wheels. I'm very happy with the results.

Sorry for this but being a auto detailing nut, you need to get those Spyder webs polished out of your paint.

Lunatic · 02-05-2015, 10:46 PM

Quote:

Originally Posted by Davf24

Sorry for this but being a auto detailing nut, you need to get those Spyder webs polished out of your paint.

Ya, I know I should.

Davf24 · 02-05-2015, 10:52 PM

Quote:

Originally Posted by Lunatic

Ya, I know I should.

I tell yah, if I was closer I would help you out, it is a passion of mine.
wax on, wax off

Davf24 · 02-05-2015, 11:02 PM

[IMG]

[/IMG]

[IMG]

[/IMG]

This is one of my master pieces.

KpAtch3s · 02-06-2015, 01:43 AM

So after cutting a whole in the fender, how did you attached the BRZ fender garnish?

Lunatic · 02-06-2015, 09:07 AM

Quote:

Originally Posted by KpAtch3s

So after cutting a whole in the fender, how did you attached the BRZ fender garnish?

Double sided tape, made for attaching body trim, like the stuff that comes with lip kits.

yomny · 02-06-2015, 10:05 AM

What he said.. its what the guy that originally did th s2k oem hood vent used to attach his vents and said that even after several track days, it held fine.

02-04-2015, 07:39 PM	#29
yomny Senior Member Join Date: Jul 2012 Drives: 2013 FRS Whiteout Location: MIA Posts: 1,545 Thanks: 557 Thanked 469 Times in 340 Posts Mentioned: 33 Post(s) Tagged: 5 Thread(s)	I think overheating needs to be addressed with maybe a bigger radiator and a fanned oil cooler. The vents help release underhood heat but I cant imagine them making such a big difference. I actually touched my charge pipe right before the TB and it was pretty damn hot, was thinking of gold wrapping it. __________________ GTX2867R, moto-tuned , tomei op , motiv fp , Invidia Q300 ti , Rota titan 17x9 +42 , nt555 255/40 , ST coilovers w/cascam , Hotchkis sways

02-05-2015, 12:29 PM	#32
yomny Senior Member Join Date: Jul 2012 Drives: 2013 FRS Whiteout Location: MIA Posts: 1,545 Thanks: 557 Thanked 469 Times in 340 Posts Mentioned: 33 Post(s) Tagged: 5 Thread(s)	I have only one concern right now with cutting the vents and is not cutting it. I've arrived at the maybe incorrect conclusion that in order to extract the air based on some stuff that i can't explain.. the low pressure high pressure stuff, the vent needs to be around the front part of the hood. As you get closer to the base of the windshield the low pressure area wont allow for maximum "pull" effect. Now i've located two slots right over the front part of the hood which sit between the fans and the engine.. but also sits right on top of my turbine housing and downpipe so when it rains. i may not like it. Vents need to go around the red areas on the hood. __________________ GTX2867R, moto-tuned , tomei op , motiv fp , Invidia Q300 ti , Rota titan 17x9 +42 , nt555 255/40 , ST coilovers w/cascam , Hotchkis sways

02-05-2015, 04:30 PM	#33
Dipstik-sportech Senior Member Join Date: Oct 2012 Drives: 2013 BRZ satin white pearl sportech Location: Thunder Bay Ontario Canada Posts: 1,813 Thanks: 842 Thanked 911 Times in 576 Posts Mentioned: 43 Post(s) Tagged: 0 Thread(s)	Neat pretty much where mine are! __________________ 2013 SWP BRZ sportech. 11.11sec@129.01mph, 511whp on e70. FullBlown base kit, FullBlown built 9.5:1 engine, GTX3076R GEN2 turbo, 1700cc Bosch injectors, FullBlown flex fuel kit, FullBlown radiator and oil cooler, FullBlown custom 3" dual exit exhaust, act xtreme clutch, whiteline diff and subframe inserts, BC Racing coilovers, hotchkiss 18mm rear sway, is300 3.73 differential ... Never finished

02-05-2015, 09:24 PM	#35
yomny Senior Member Join Date: Jul 2012 Drives: 2013 FRS Whiteout Location: MIA Posts: 1,545 Thanks: 557 Thanked 469 Times in 340 Posts Mentioned: 33 Post(s) Tagged: 5 Thread(s)	I'm sure any vent in any location will help, so there's no wrong placement. __________________ GTX2867R, moto-tuned , tomei op , motiv fp , Invidia Q300 ti , Rota titan 17x9 +42 , nt555 255/40 , ST coilovers w/cascam , Hotchkis sways

02-05-2015, 11:02 PM	#39
Davf24 Member Join Date: Jan 2015 Drives: 2013 FR-S, Hot Lava Location: Connecticut Posts: 44 Thanks: 1 Thanked 10 Times in 9 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	[IMG][/IMG] [IMG][/IMG] This is one of my master pieces.

02-05-2015, 05:15 PM	#34
Lunatic Senior Member Join Date: Jan 2014 Drives: 2015 Raven FRS Location: Indio, CA. Just an Old Fart in a Automatic!. Posts: 1,614 Thanks: 7 Thanked 1,057 Times in 488 Posts Mentioned: 40 Post(s) Tagged: 2 Thread(s)	I don't really know how much my fended vents help, if any, as I added a oil cooler and tranny cooler at the same time. What I can say is my engine oil and tranny fluid both stay below 230 degrees on the track and when pulling into the pits you can really feel the heat coming out of the vents. I'm sure they didn't do any harm. And I think they look pretty good.

02-06-2015, 01:43 AM	#40
KpAtch3s Member Join Date: Feb 2013 Drives: 2013 Scion F-RS Location: Florida Posts: 38 Thanks: 7 Thanked 3 Times in 3 Posts Mentioned: 13 Post(s) Tagged: 1 Thread(s)	So after cutting a whole in the fender, how did you attached the BRZ fender garnish?

02-06-2015, 10:05 AM	#42
yomny Senior Member Join Date: Jul 2012 Drives: 2013 FRS Whiteout Location: MIA Posts: 1,545 Thanks: 557 Thanked 469 Times in 340 Posts Mentioned: 33 Post(s) Tagged: 5 Thread(s)	What he said.. its what the guy that originally did th s2k oem hood vent used to attach his vents and said that even after several track days, it held fine. __________________ GTX2867R, moto-tuned , tomei op , motiv fp , Invidia Q300 ti , Rota titan 17x9 +42 , nt555 255/40 , ST coilovers w/cascam , Hotchkis sways

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