06-26-2013, 09:07 PM | #15 |
Member
Join Date: Dec 2011
Drives: 1995 Mazda Miata
Location: Middle Tennessee
Posts: 28
Thanks: 2
Thanked 13 Times in 6 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
|
Raising the hood and/or removing the weather strip isn't going to help the cooling at speed. The base of the windshield is a high pressure area, so as speed you are going to force air back into the engine bay.
Since the engine bay is already a high pressure area, you want to use a low pressure area to "pull" the air from under hood out of the car. Looking at this velocity plot from Hancha Group, you'd want to have the vents in the red area of the hood. From what I've seen in other plots of theirs (on Miatas) the green is high pressure, low speed air. I'm sure they could shed much better light on this than me. |
The Following 4 Users Say Thank You to Midtenn For This Useful Post: | blackfireball5 (03-03-2014), charged86 (06-26-2013), Murseman27 (06-30-2013), Snozzberries (09-21-2013) |
06-26-2013, 09:55 PM | #16 | |
Thupercharged
Join Date: Mar 2013
Drives: 2013 FR-S
Location: La Grange Park, IL.
Posts: 1,501
Thanks: 116
Thanked 751 Times in 439 Posts
Mentioned: 23 Post(s)
Tagged: 0 Thread(s)
|
Quote:
Also the green low pressure area is right at the hood cowl it appears, so it should create a low pressure area for air from the hood to vent from. Hopefully that will also mean the possibility of more air moving past your intercooler/radiator
__________________
2013 FRS
Vortech V3 11psi Revworks UEL - PLM Overpipe - MOTIV catted frontpipe - Invidia Q300 2019 Series.Grey STI - Stage1+ SF |
|
06-26-2013, 10:50 PM | #17 | |
Mr. Cranky Pants
Join Date: Apr 2013
Drives: 2013 Argento FR-S
Location: San Diego
Posts: 449
Thanks: 76
Thanked 147 Times in 103 Posts
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
|
Quote:
It looks like the cowl area is less pressure than what's in front of the radiator, of course, but it'll never be as effective as hood vents underneath that red area on the hood, which will also result in more air through the radiator. |
|
06-26-2013, 11:09 PM | #18 | |
Thupercharged
Join Date: Mar 2013
Drives: 2013 FR-S
Location: La Grange Park, IL.
Posts: 1,501
Thanks: 116
Thanked 751 Times in 439 Posts
Mentioned: 23 Post(s)
Tagged: 0 Thread(s)
|
Quote:
Reviews seem mixed with spacers
__________________
2013 FRS
Vortech V3 11psi Revworks UEL - PLM Overpipe - MOTIV catted frontpipe - Invidia Q300 2019 Series.Grey STI - Stage1+ SF |
|
06-27-2013, 09:28 AM | #19 |
Senior Member
Join Date: Jun 2012
Drives: Hydra EMS Powered FRS Raven Black
Location: Maryland
Posts: 839
Thanks: 54
Thanked 1,021 Times in 365 Posts
Mentioned: 61 Post(s)
Tagged: 2 Thread(s)
|
I've had to resort to desperate measures while racing when dealing with cooling and underhood pressure. Now serious problems creep up when going 100 mph+ and on my STi pulling the rear rubber strip out did help a little (probably more at low speeds vs. high). In that application air doesn't not back flow from the windshield area into the engine like most said it should. I know this because fluids from the coolant overflow tank would spray onto the windshield. Ok there is a downside to removing that strip and one would be fluid on the windshield if the overflow coolant tank leaks a little (which it does) and two would be your fresh air vent on the passenger side would now be exposed to engine bay fumes.
Now I've also jig sawed huge holes in my hood at the track because I was getting black flagged because they thought my hood (carbon) was loose but it was just the massive pressure. After cutting the vent I noticed inreased cooling and more front end grip. Now keep in mind this was a race application where speeds were seen over 160 mph. For the FRS/BRZ turbo guys I really think heat soak is more the real issue vs lack of airflow so if I was going to vent my hood I would do it like where an EVO hood is vented or that space between the radiator and the engine. On my race car I have to increase airflow through the radiator at high speed as I'm overheating so I will likely cut a large opening as mentioned above, make a Gurney Flap for the leading edge, reverse Gurney forthe trailing edge, and paint some mesh to clean up the look. I did this to one of my STi hoods with god results and I'll see if I can dig up a picture. |
06-27-2013, 09:42 AM | #20 |
Banned
Join Date: Mar 2013
Drives: 2013 FR-S
Location: Orlando, FL
Posts: 2,929
Thanks: 1,166
Thanked 2,293 Times in 1,180 Posts
Mentioned: 313 Post(s)
Tagged: 4 Thread(s)
|
real men saw holes in their hoods.
|
06-27-2013, 10:02 AM | #21 |
Senior Member
Join Date: Jun 2012
Drives: Hydra EMS Powered FRS Raven Black
Location: Maryland
Posts: 839
Thanks: 54
Thanked 1,021 Times in 365 Posts
Mentioned: 61 Post(s)
Tagged: 2 Thread(s)
|
Well I think for street guys cutting a hole large enough so somebody could steal their turbo kit without popping the hood might not be the best choice. LOL! A good vented carbon hood or finding a louvered insert would be ideal.
My personal car......."because race car" who cares |
The Following 2 Users Say Thank You to Element Tuning For This Useful Post: | ftc~brz (09-25-2013), Sportsguy83 (10-11-2013) |
06-27-2013, 10:05 AM | #22 |
I usually post drunk
Join Date: Oct 2009
Drives: BRZ
Location: NY
Posts: 1,487
Thanks: 15
Thanked 490 Times in 231 Posts
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
|
Does Seibon fall under "good vented carbon hood"?
|
The Following 2 Users Say Thank You to #87 For This Useful Post: | blackfireball5 (03-03-2014), Mersd (09-26-2013) |
06-27-2013, 10:11 AM | #23 |
NASA SpecE30 Racer
|
Probably falls closer to "vented carbon hood", but I don't know that there are any better options. I will probably buy one eventually.
__________________
- King Tut
Street/Track Car: 2006 Honda S2000 TT3 || Race Car: 1987 BMW 325is SpecE30 || Tow Vehicle: 2014 RAM 1500 EcoDiesel Sold Cars: 2012 BMW M3 || 2013 Subaru BRZ || 2012 Porsche Cayman R || 2009 Chevrolet Z06 || 2009 BMW M3 || 2004 BMW M3 || 2004 Nissan 350Z |
06-27-2013, 01:07 PM | #24 |
Senior Member
Join Date: Jun 2012
Drives: Hydra EMS Powered FRS Raven Black
Location: Maryland
Posts: 839
Thanks: 54
Thanked 1,021 Times in 365 Posts
Mentioned: 61 Post(s)
Tagged: 2 Thread(s)
|
Street guys really don't need this much but real race cars do because of the high speeds and how much pressure builds up.
Air can also be dumped out the sides of the bumper or underneath the car (least ideal). |
06-27-2013, 01:31 PM | #25 | |
Member
Join Date: Dec 2011
Drives: 1995 Mazda Miata
Location: Middle Tennessee
Posts: 28
Thanks: 2
Thanked 13 Times in 6 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
|
Quote:
I agree that sitting still or at low speeds, it might help out some, but at high speeds, you don't want to forcing more air under the hood (pressure has to go somewhere). |
|
06-27-2013, 05:15 PM | #26 | |
Thupercharged
Join Date: Mar 2013
Drives: 2013 FR-S
Location: La Grange Park, IL.
Posts: 1,501
Thanks: 116
Thanked 751 Times in 439 Posts
Mentioned: 23 Post(s)
Tagged: 0 Thread(s)
|
Quote:
On the composite undertray behind the aluminum skid plate there are actually vents cut into it. I wonder if thats where they want all the hot engine air to escape to, with airflow going through radiator/engine bay/and then out of those lower vents
__________________
2013 FRS
Vortech V3 11psi Revworks UEL - PLM Overpipe - MOTIV catted frontpipe - Invidia Q300 2019 Series.Grey STI - Stage1+ SF |
|
06-28-2013, 08:57 PM | #27 | |
Senior Member
Join Date: May 2013
Drives: FR-S 10 #103 AT
Location: NC
Posts: 1,519
Thanks: 101
Thanked 599 Times in 347 Posts
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
|
Quote:
__________________
Necessity may be the mother of Invention but Desperation is quite often the father.
“Sex is like Bridge. If you don't have a good partner, you'd better have a good hand.” - Mae West Papa said, "son there's a lot of evil temptations out there. Best to try 'em all so you know which ones to avoid." |
|
06-29-2013, 06:55 PM | #28 | |
Senior Member
Join Date: Jun 2012
Drives: Hydra EMS Powered FRS Raven Black
Location: Maryland
Posts: 839
Thanks: 54
Thanked 1,021 Times in 365 Posts
Mentioned: 61 Post(s)
Tagged: 2 Thread(s)
|
Quote:
I would bet most street cars don't have vented hoods for better fuel efficiency and less drag. I was hoping I wasn't going to have to vent the hood since I don't have much front lift but the engine is just running too hot turbocharged while racing. |
|
|
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
snails and turbos | carbonBLUE | Off-Topic Lounge [WARNING: NO POLITICS] | 10 | 12-27-2012 04:44 PM |
Turbos making less power down low? | subatoy | Forced Induction | 40 | 10-03-2012 02:30 AM |
Carbon Fiber Hoods. | Asterisked Accolade | Cosmetic Modification (Interior/Exterior/Lighting) | 17 | 09-25-2012 04:44 PM |
Why does the aftermarket love turbos? Why not superchargers? | ahausheer | Other Vehicles & General Automotive Discussions | 44 | 07-22-2012 10:27 AM |
For those crying about turbos | Mari0 | Off-Topic Lounge [WARNING: NO POLITICS] | 2 | 06-15-2012 09:57 PM |