Window ducts/air circulation - Page 2 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

EndlessAzure · 08-07-2022, 11:49 PM

Quote:

Originally Posted by blsfrs

Just thinking out loud: I wonder if removing the cabin filter for track days would significantly help the air flow through the vents?

I don't think so. The HVAC system is aided by the high pressure zone behind the windshield. Like @Ultramaroon , you'll just get gunk in your HVAC system. If you have the blower motor going, it's going to have pretty good flow already at max setting.

One thing that I didn't think about but did notice at a recent track day was that if you have hood vents, you car is likely going to suck in the hot engine exhaust air. The HVAC intake is the grating on the windshield cowl on the driver side. I was wondering why it seemed hotter than ambient during some points of my drive

Sgt.Gator · 08-09-2022, 02:11 PM

New driver cooling ducts to be tested this weekend at Portland on my STI.
$7 each side in downspout parts at Lowes.

...

GrandSport · 08-09-2022, 04:14 PM

lol, was looking for something a bit more integrated but beggars can't be choosers I suppose!

NoHaveMSG · 08-09-2022, 04:26 PM

Quote:

Originally Posted by GrandSport

lol, was looking for something a bit more integrated but beggars can't be choosers I suppose!

At this point I am thinking naca duct in the roof. Track car anyway so eff it

Kelse92 · 08-10-2022, 11:36 AM

I think our corner windows are a little too small to get airflow in compared to what can be replaced in a Spec Miata, buttt I'm thinking with some ingenuity and customization + 3D printing something could be made at a smaller scale, but I guess at what cost for looks? The drain spout is pure function and cheap, but probably not my favorite choice either

blsfrs · 08-10-2022, 12:34 PM

Quote:

Originally Posted by Kelse92

I think our corner windows are a little too small to get airflow in compared to what can be replaced in a Spec Miata, buttt I'm thinking with some ingenuity and customization + 3D printing something could be made at a smaller scale, but I guess at what cost for looks? The drain spout is pure function and cheap, but probably not my favorite choice either

I think you are right about the air flow over the 1/4 window. My first attempt at a duct was a failure as it did not direct any air into the car. I realized that the A pillar and mirror interfered with the flow of air across the 1/4 window. A NACA duct needs unobstructed air flow to work.

GrandSport · 08-17-2022, 10:06 AM

Quote:

Originally Posted by Kelse92

I think our corner windows are a little too small to get airflow in compared to what can be replaced in a Spec Miata, buttt I'm thinking with some ingenuity and customization + 3D printing something could be made at a smaller scale, but I guess at what cost for looks? The drain spout is pure function and cheap, but probably not my favorite choice either

Hey Kelse! Funny running into you on the forums (we met at ECR). You're now officially not allowed to laugh if I zip tie a gutter drain to my car

Sgt.Gator · 08-21-2022, 04:58 PM

My gutter downspouts worked pretty well. There was flow into the car, but not a hurricane. I think an extension on the front would probably improve the flow even more.

GrandSport · 07-19-2023, 03:09 PM

So as an update, BSP made this as a solution for the DS and I just had them make one for the passenger side it worked so well. Lots of airflow.

Only thing I'm pondering is removing the rear "sail" glass. I'm thinking it would help air flow more. If not, I'm going to remove the factory vents/bleeder flap things in the rear to help get negative pressure behind the seats.

soundman98 · 07-19-2023, 07:35 PM

Quote:

Originally Posted by GrandSport

So as an update, BSP made this as a solution for the DS and I just had them make one for the passenger side it worked so well. Lots of airflow.

Only thing I'm pondering is removing the rear "sail" glass. I'm thinking it would help air flow more. If not, I'm going to remove the factory vents/bleeder flap things in the rear to help get negative pressure behind the seats.

this gives me some pretty terrible idea's about making an old-style window that can flip around in that area...

GrandSport · 07-20-2023, 12:15 PM

It flows a lot of air. It made a big difference. There's just NO AIRFLOW in that car.

The more I think about it, the more I think it's because of a lack of an exit for the air rather than needing ducting.

NoHaveMSG · 07-20-2023, 01:15 PM

Quote:

Originally Posted by GrandSport

It flows a lot of air. It made a big difference. There's just NO AIRFLOW in that car.

The more I think about it, the more I think it's because of a lack of an exit for the air rather than needing ducting.

Yeah, you need a spot at a low pressure area of the body to evacuate the air from the cabin. Vent at license plate position on trunk?

Ultramaroon · 07-20-2023, 01:49 PM

Quote:

Originally Posted by NoHaveMSG

Yeah, you need a spot at a low pressure area of the body to evacuate the air from the cabin. Vent at license plate position on trunk?

Careful! Vent location at the base of the rear hatch was a major fail for the first year 240Z. I spent years sucking exhaust gasses whenever I didn't force fresh air into the cabin.

NoHaveMSG · 07-20-2023, 01:56 PM

Quote:

Originally Posted by Ultramaroon

Careful! Vent location at the base of the rear hatch was a major fail for the first year 240Z. I spent years sucking exhaust gasses whenever I didn't force fresh air into the cabin.

Didn't even think of that. Good point.

08-09-2022, 04:14 PM	#17
GrandSport Senior Member Join Date: Sep 2018 Drives: 13 Viper; 14 BRZ; 90 Miata; 18 AMG Location: TX Posts: 384 Thanks: 82 Thanked 231 Times in 129 Posts Mentioned: 5 Post(s)	lol, was looking for something a bit more integrated but beggars can't be choosers I suppose! __________________ 2014 BRZ: WRL Build (GP2) MCS, AP, Motec, race wiring harness, blah blah blah 2014 FRS: Similar WRL Build. Back up / parts / practice race car. 2013 Viper GTS : Tractive Coilovers, ACR sway bars, aero, carbon, exhaust, etc. 1999 NB Spec Miata: 1.8 w/ all the goodies. 2022 CT5 Blackwing: Stock.

08-10-2022, 11:36 AM	#19
Kelse92 At the track Join Date: Feb 2021 Drives: '14 FRS - Former e92 M3 Location: Dallas, TX Posts: 193 Thanks: 239 Thanked 210 Times in 100 Posts Mentioned: 3 Post(s)	I think our corner windows are a little too small to get airflow in compared to what can be replaced in a Spec Miata, buttt I'm thinking with some ingenuity and customization + 3D printing something could be made at a smaller scale, but I guess at what cost for looks? The drain spout is pure function and cheap, but probably not my favorite choice either __________________ #ladydriven Nasa TT4 FRS // JRZ RS Pro // Karcepts Sway Bars // K24 Swap (in Progress) // AP Endurance BBK // Cobalt Friction brake pads // Safeplace Auto

07-19-2023, 03:09 PM	#23
GrandSport Senior Member Join Date: Sep 2018 Drives: 13 Viper; 14 BRZ; 90 Miata; 18 AMG Location: TX Posts: 384 Thanks: 82 Thanked 231 Times in 129 Posts Mentioned: 5 Post(s)	So as an update, BSP made this as a solution for the DS and I just had them make one for the passenger side it worked so well. Lots of airflow. Only thing I'm pondering is removing the rear "sail" glass. I'm thinking it would help air flow more. If not, I'm going to remove the factory vents/bleeder flap things in the rear to help get negative pressure behind the seats. __________________ 2014 BRZ: WRL Build (GP2) MCS, AP, Motec, race wiring harness, blah blah blah 2014 FRS: Similar WRL Build. Back up / parts / practice race car. 2013 Viper GTS : Tractive Coilovers, ACR sway bars, aero, carbon, exhaust, etc. 1999 NB Spec Miata: 1.8 w/ all the goodies. 2022 CT5 Blackwing: Stock.

07-20-2023, 12:15 PM	#25
GrandSport Senior Member Join Date: Sep 2018 Drives: 13 Viper; 14 BRZ; 90 Miata; 18 AMG Location: TX Posts: 384 Thanks: 82 Thanked 231 Times in 129 Posts Mentioned: 5 Post(s)	It flows a lot of air. It made a big difference. There's just NO AIRFLOW in that car. The more I think about it, the more I think it's because of a lack of an exit for the air rather than needing ducting. __________________ 2014 BRZ: WRL Build (GP2) MCS, AP, Motec, race wiring harness, blah blah blah 2014 FRS: Similar WRL Build. Back up / parts / practice race car. 2013 Viper GTS : Tractive Coilovers, ACR sway bars, aero, carbon, exhaust, etc. 1999 NB Spec Miata: 1.8 w/ all the goodies. 2022 CT5 Blackwing: Stock.

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08-09-2022, 02:11 PM	#16
Sgt.Gator Member Join Date: May 2016 Drives: 2005 STI Race Car- 08 Spec B DD Location: Bend OR Posts: 14 Thanks: 1 Thanked 13 Times in 7 Posts Mentioned: 0 Post(s)	New driver cooling ducts to be tested this weekend at Portland on my STI. $7 each side in downspout parts at Lowes. ...

08-21-2022, 04:58 PM	#22
Sgt.Gator Member Join Date: May 2016 Drives: 2005 STI Race Car- 08 Spec B DD Location: Bend OR Posts: 14 Thanks: 1 Thanked 13 Times in 7 Posts Mentioned: 0 Post(s)	My gutter downspouts worked pretty well. There was flow into the car, but not a hurricane. I think an extension on the front would probably improve the flow even more.

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