Reduce under the hood temps? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

sw20kosh · 11-11-2013, 02:14 PM

Saw this post:

http://www.ft86club.com/forums/showthread.php?t=50460

Valid?

Dave-ROR · 11-11-2013, 02:22 PM

Are you trying to reduce intake temps or underhood temps? IMO his testing is flawed, the intake temp is mostly based on the air it's picking up and will go down with moving. If underhood temps, mount temp probes around the engine bay and do some repeatable testing.

Byebye · 11-11-2013, 02:32 PM

I'm assuming the op's intake manifold is getting heat soaked in the thread link you posted.

You could probably achieve the same with a hood with vents. Of course that would be more expensive and won't stop rain from entering.

Captain Snooze · 11-12-2013, 01:19 AM

If you are chasing lower under hood temperatures Robispec says

Quote:

Originally Posted by robispec

moves alot more air so I block off 3/4 of the grill both for wind resistance and front downforce

in reference to this:

icemang17 · 11-13-2013, 07:50 PM

is your car overheating? Is heat soak effecting your supercharger?

if the answer to both is no....then WHO CARES.....sure in theory its better, but 10c (20F) drop isn't that big of a deal......

The stock cooling system in my FRS works really well, no issues even in 105F days at Thunderhill.....even with the AC on in the hotpit.....car ran perfect...

EN2_Squirrel · 11-15-2013, 07:04 PM

I will be trying a different thermostat soon

CSG Mike · 11-15-2013, 07:21 PM

Quote:

Originally Posted by sw20kosh

Saw this post:

http://www.ft86club.com/forums/showthread.php?t=50460

Valid?

Completely invalid. He's raising his temps. Remember hood cowls on muscle cars? They're there cuz they suck in air. Removing the gap behind the hood does the same thing, reducing airflow through the radiator. It only helps when you're parked.

Get a vented hood if you need to lower temps. We can help you with that. We're also testing a CSG radiator

Captain Snooze · 11-17-2013, 12:39 AM

Quote:

Originally Posted by CSG Mike

Get a vented hood if you need to lower temps.

What's the deal with venting a hood then having water, dirt, bird poop flowing down the vents when parked in the rain? Is that the trade off for venting the hood?

BlaineWasHere · 11-17-2013, 01:36 AM

Quote:

Originally Posted by Captain Snooze

What's the deal with venting a hood then having water, dirt, bird poop flowing down the vents when parked in the rain? Is that the trade off for venting the hood?

It's not ideal on a DD.

MINOCIN · 11-17-2013, 03:05 PM

Since a vented hood isn't ideal for DD, I'm curious if anyone perhaps has a separate track only hood? Kind of like how many people have a separate set of track wheels & tires and track only brakes that they put on for track days. Obviously a vented hood isn't going to fit in the trunk of the car along with your spare wheels and equipment, but you could always switch out the hoods at home before leaving for the track event. That way you get you extra the cooling and downforce at the track where you need it, and the rest of the time you stick with your stock hood for DD where you get the protection from the elements.

I would think that swapping out hoods should take no longer than swapping out a set of wheels. I have a buddy who only puts on his rear spoiler for track days, which is probably no more than a dozen days out of the year.

Sure we all love our cars and look for any excuse to go canyon carving, but in our normal DD I would think that a non-vented hood would still be ok for most of us. I'm not FI and I live in beautiful Santa Barbara CA where it's never too hot or cold. So I don't know, maybe a vented hood is a necessity if you're FI and in Texas or Arizona. Here in Santa Barbara though, the weather is nice but we got a lot of trees. So there are a lot of leaves and crap flying around in the air that get stuck in the wiper area of the car. I definitely don't want that stuff getting into the engine bay. There are enough smells coming from there as it is.

CSG Mike · 11-17-2013, 04:00 PM

Quote:

Originally Posted by Captain Snooze

What's the deal with venting a hood then having water, dirt, bird poop flowing down the vents when parked in the rain? Is that the trade off for venting the hood?

Most authentic hoods have trays to catch things that go into the vent... although I haven't seen any authentic vented hoods for the FRS/BRZ myself yet.

Either way, it hasn't been a big deal in my experience.

Captain Snooze · 11-17-2013, 04:07 PM

I must admit to being a little in lust with Robipec's vented hood

finch1750 · 11-19-2013, 07:14 PM

@omegared19 has Prova vents installed an cut out the inside. Dropped engine bay temps significantly he said.

AceHeader-MT · 11-26-2013, 08:19 AM

Quote:

Originally Posted by CSG Mike

Completely invalid. He's raising his temps. Remember hood cowls on muscle cars? They're there cuz they suck in air. Removing the gap behind the hood does the same thing, reducing airflow through the radiator. It only helps when you're parked.

Get a vented hood if you need to lower temps. We can help you with that. We're also testing a CSG radiator

Hello Mike,
Yes, it does help temp drop temps when park and sit in the pit lane.
Can you tell me how to test the "reducing airflow through the radiator."?
I would like to test it.

Thank you

Ace

11-11-2013, 02:14 PM	#1
sw20kosh Senior Member Join Date: Jul 2012 Drives: 2013 Black FR-S Location: SF Posts: 3,030 Thanks: 881 Thanked 2,014 Times in 990 Posts Mentioned: 153 Post(s) Tagged: 1 Thread(s)	Reduce under the hood temps? Saw this post: http://www.ft86club.com/forums/showthread.php?t=50460 Valid? __________________ 86DRIVE Challenge

11-11-2013, 02:22 PM	#2
Dave-ROR Site Moderator Join Date: Dec 2010 Drives: Stuff Location: Florida Posts: 10,317 Thanks: 955 Thanked 5,965 Times in 2,689 Posts Mentioned: 262 Post(s) Tagged: 8 Thread(s)	Are you trying to reduce intake temps or underhood temps? IMO his testing is flawed, the intake temp is mostly based on the air it's picking up and will go down with moving. If underhood temps, mount temp probes around the engine bay and do some repeatable testing. __________________ -Dave Track cars: 2013 Scion FRS, 1998 Acura Integra Type-R, 1993 Honda Civic Hatchback DD: 2005 Acura TSX Tow: 2022 F-450 Toys: 2001 Chevrolet Corvette Z06, 1993 Toyota MR2 Turbo, 1994 Toyota MR2 Turbo, 1991 Mitsubishi Galant VR-4 Parts: 2015 Subaru BRZ Limited, 2005 Acura TSX Projects: 2013 Subaru BRZ Limited track car build FS: 2004 GMC Sierra 2500 LT CCSB 8.1/Allison with 99k miles

11-17-2013, 04:07 PM	#12
Captain Snooze Because compromise ® Join Date: Jan 2012 Drives: Red Herring Location: australia Posts: 7,737 Thanks: 4,001 Thanked 9,383 Times in 4,137 Posts Mentioned: 60 Post(s) Tagged: 0 Thread(s)	I must admit to being a little in lust with Robipec's vented hood __________________ My car is completely stock except for all the mods.

11-19-2013, 07:14 PM	#13
finch1750 Undisputed El Presidente Join Date: Jun 2012 Drives: Zenki 37J ZN6 Location: Stockton, CA Posts: 11,571 Thanks: 9,382 Thanked 9,397 Times in 5,261 Posts Mentioned: 374 Post(s) Tagged: 33 Thread(s)	@omegared19 has Prova vents installed an cut out the inside. Dropped engine bay temps significantly he said. __________________ "Just like how a strut bar somehow enables you to corner 20MPH faster around a cloverleaf on-ramp, when the reality is, you can do it already but you just don't have to balls to do it." - CSG David

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11-11-2013, 02:32 PM	#3
Byebye Senior Member Join Date: Oct 2012 Drives: 2013 FR-S Location: Springfield, Va Posts: 168 Thanks: 98 Thanked 50 Times in 33 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	I'm assuming the op's intake manifold is getting heat soaked in the thread link you posted. You could probably achieve the same with a hood with vents. Of course that would be more expensive and won't stop rain from entering.

11-13-2013, 07:50 PM	#5
icemang17 Senior Member Join Date: Jun 2012 Drives: Scion FR-S Location: Stockton CA Posts: 171 Thanks: 2 Thanked 93 Times in 51 Posts Mentioned: 13 Post(s) Tagged: 0 Thread(s)	is your car overheating? Is heat soak effecting your supercharger? if the answer to both is no....then WHO CARES.....sure in theory its better, but 10c (20F) drop isn't that big of a deal...... The stock cooling system in my FRS works really well, no issues even in 105F days at Thunderhill.....even with the AC on in the hotpit.....car ran perfect...

11-15-2013, 07:04 PM	#6
EN2_Squirrel Senior Member Join Date: Aug 2012 Drives: 2013 FR-S Location: San Diego Posts: 300 Thanks: 180 Thanked 58 Times in 46 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	I will be trying a different thermostat soon

11-17-2013, 03:05 PM	#10
MINOCIN Senior Member Join Date: Mar 2013 Drives: Asphalt 2013 FR-S Location: United States Posts: 140 Thanks: 163 Thanked 41 Times in 33 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Since a vented hood isn't ideal for DD, I'm curious if anyone perhaps has a separate track only hood? Kind of like how many people have a separate set of track wheels & tires and track only brakes that they put on for track days. Obviously a vented hood isn't going to fit in the trunk of the car along with your spare wheels and equipment, but you could always switch out the hoods at home before leaving for the track event. That way you get you extra the cooling and downforce at the track where you need it, and the rest of the time you stick with your stock hood for DD where you get the protection from the elements. I would think that swapping out hoods should take no longer than swapping out a set of wheels. I have a buddy who only puts on his rear spoiler for track days, which is probably no more than a dozen days out of the year. Sure we all love our cars and look for any excuse to go canyon carving, but in our normal DD I would think that a non-vented hood would still be ok for most of us. I'm not FI and I live in beautiful Santa Barbara CA where it's never too hot or cold. So I don't know, maybe a vented hood is a necessity if you're FI and in Texas or Arizona. Here in Santa Barbara though, the weather is nice but we got a lot of trees. So there are a lot of leaves and crap flying around in the air that get stuck in the wiper area of the car. I definitely don't want that stuff getting into the engine bay. There are enough smells coming from there as it is.

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