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Old 06-03-2019, 01:46 PM
  #1821  
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Originally Posted by Kinavo View Post
How far should my front splitter protrude past the air dam if I have the Blackbird Fabworx spoiler in the rear?

~250 WHP
245 Rival S
Autocross Application
The advice i got from some SCCA guys was 3-4" and the splitter near vertical. For track, I'm following Emilio's advice of airdam/undertry only and haven't built an autocross version for my car yet, so YMMV.
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Old 06-03-2019, 02:21 PM
  #1822  
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Originally Posted by Kinavo View Post
How far should my front splitter protrude past the air dam if I have the Blackbird Fabworx spoiler in the rear?

~250 WHP
245 Rival S
Autocross Application
I had a 4" splitter on 245 RS4, Xidas, etc and could NOT get the car aero balanced while running the BFW spoiler regardless how many adjustments I tried. I had exit oversteer. This year I switched to the NLR wing and all those problems are gone.
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Old 07-17-2019, 08:05 PM
  #1823  
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While this is not really "aero" directly, I wanted to post this here because it is aero impacted and I have come to really respect the ideas/options in this thread.

I have a need to place an auxiliary coolant heat exchanger in my system due to the rear mount turbo. Last track day saw temps hitting 260 when pushing it hard in the heat of the TX sun.

I have 2 options I am looking at for placement and I'd like to get some input.

1. In the duck bill lid like a Porche


2. Where the license plate is at.



I plan to run a GT-250 wing so unsure how that would impact option 1 and not a huge fan of cutting into my fastback but I think it would look good.

Fans will be wired in reverse for both options so the fans are inside the trunk and will force air out of the lid or plate area.

Thanks to this thread, I am also currently building a front air dam and splitter to hopefully balance out the rear wing. (Will trim the splitter to match the final shape of the air dam)
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Old 07-17-2019, 08:11 PM
  #1824  
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Originally Posted by BEAVIS View Post
DIY Naca ducts 3d printed, flush mounted in the birch ply splitter floor and feeding 3" hose feeding to the rotor/hub area.
Not tested yet to prove it, but along with brake cooling this may even help with extra front downforce.
I designed the ducts myself in Fuision360, and sort of 'winged' the shape (pun intended) so I cannot know for sure if it will work.
If you're interested, plenty more details on the car here: www.youtube.com/bbeavis

Dollars spent: ~$10 for the ducts
Hours spent: 2hrs to design duct, 1.5days to 3d print, ~4hrs to cut/glue into the splitter and attach hoses.
How effective: testing next weekend...
Materials used: PLA plastic ducts, 3" hose, zip ties to secure hose to car.


Interested to hear how the undertray Naca brake duct worked out?
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Old 07-17-2019, 11:19 PM
  #1825  
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Originally Posted by griff View Post
While this is not really "aero" directly, I wanted to post this here because it is aero impacted and I have come to really respect the ideas/options in this thread.

I have a need to place an auxiliary coolant heat exchanger in my system due to the rear mount turbo. Last track day saw temps hitting 260 when pushing it hard in the heat of the TX sun.
Vegas has the best setup I've seen for a rear mounted heat exchanger. Take the high pressure wheel well air and duct it into the low pressure license plate area. Should provide a small lift reduction with minimal drag penalty.

https://www.miataturbo.net/build-thr...s-89595/page8/
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Old 07-17-2019, 11:31 PM
  #1826  
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Ha... what do ya know! 2 birds with one stone and I can mount it so the fans draw air the way they were designed to rather than push. I recall seeing a post where a guy ran ducts to the backup light holes he broke out. Good idea but the license plate spot just looked "right" to me. Glad to see someone else thought the same. Thanks for the link!
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Old 07-18-2019, 09:21 AM
  #1827  
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The top of the decklid would be a high pressure area, especially with the duck tail, so an exit vent wouldn't work there.
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Old 07-18-2019, 03:59 PM
  #1828  
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Many higher HP race cars use the license plate area. Its a naturally low pressure area.
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Old 07-18-2019, 06:01 PM
  #1829  
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Originally Posted by Blkbrd69 View Post
Many higher HP race cars use the license plate area. Its a naturally low pressure area.
Thanks to all those that replied! Now back to work on the air dam....




Last edited by griff; 07-19-2019 at 06:29 AM.
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Old 07-19-2019, 05:23 AM
  #1830  
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Originally Posted by mx5-kiwi View Post
Originally Posted by BEAVIS View Post
DIY Naca ducts 3d printed, flush mounted in the birch ply splitter floor and feeding 3" hose feeding to the rotor/hub area.
Not tested yet to prove it, but along with brake cooling this may even help with extra front downforce.
I designed the ducts myself in Fuision360, and sort of 'winged' the shape (pun intended) so I cannot know for sure if it will work.
Dollars spent: ~$10 for the ducts
Hours spent: 2hrs to design duct, 1.5days to 3d print, ~4hrs to cut/glue into the splitter and attach hoses.
How effective: testing next weekend...
Materials used: PLA plastic ducts, 3" hose, zip ties to secure hose to car.
Interested to hear how the undertray Naca brake duct worked out?
Not definitive yet, and unfortunately I didn't measure *before* temps. (I monitor caliper temp now though.)
The brakes worked ok at the last event, but still suffer from heat after about 4 hard laps. I want to add a form of backing/duct to feed the air better at the hub, but that'll take some engineering.
Either my driving style / power level / grip levels are too much for the brakes now, or Wilwoods just aren't good enough.
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Old 07-19-2019, 05:48 AM
  #1831  
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For our 1/2 hour races we switched to Superlite and made a huge difference to heat capability AND pad life.....over the Dynalite style.

Are you on Superlite or a Dynalite type?

Big weight/mass difference though. For Superlap we might move back to the dynalites.

But keen to hear how the undertray ducts work out.
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Old 07-19-2019, 10:19 AM
  #1832  
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Default New CSP trim!


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Old 07-19-2019, 12:54 PM
  #1833  
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Originally Posted by BEAVIS View Post
Not definitive yet, and unfortunately I didn't measure *before* temps. (I monitor caliper temp now though.)
The brakes worked ok at the last event, but still suffer from heat after about 4 hard laps. I want to add a form of backing/duct to feed the air better at the hub, but that'll take some engineering.
Either my driving style / power level / grip levels are too much for the brakes now, or Wilwoods just aren't good enough.
Interested in your continued testing of this. Did you have ducted brakes before? Is there a reason you chose the splitter bottom over the front fascia? You should be able to get much higher pressure from the fascia.
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