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GC8 Track Aero - Double Deck Rear Diffuser

Old 05 February 2018, 03:20 PM
  #61  
Jonny Cut Corners
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Originally Posted by MY94BlueWRX View Post
We were running with them until I did the testing, and they actually were causing air to enter the engine bay... not the other way around!

Wow, very interesting. I think I owe you a few beers for all this info!
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Old 05 February 2018, 10:30 PM
  #62  
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No problem, happy to help... if you have any more question just ask?
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Old 16 August 2018, 11:41 PM
  #63  
MY94BlueWRX
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Default 6 Months Goes Fast!

Well itís been 6 months since I last posted, and unfortunately not much has happened with the car, as Iíve been building a new home for it... a purpose built garage that can accommodate a two post lift and a workshop.

I'm coming close to the end but these things take more time than you realise, especially when I had to build another structure first to house all the existing garage crap!

Anyway... regarding the car, I have altered the geometry to suit the Avon slick tyres, as I had it way off causing the car to roll massively as it tried to sit flat on the contact patch, really need to get the tyre temp monitoring system set up, as this would have told me straight away!! You live and learn I guess...

Plus Iíve swapped out the sh*tty comp brake biasing valve going to the rear brakes with a proper AP Racing item, as I donít think the comp brake thing was doing anything, which was causing the rears to lock up... not great when youíre on the edge already lol 😂

Hopefully in the coming months I can get back onto the car development, once Iíve got our entire setup moved home... till then 👍

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Old 20 August 2018, 10:51 PM
  #64  
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looking forward to seeing the latest developments and the new workshop
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Old 17 September 2018, 06:03 PM
  #65  
Ash Webster
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where did you get the front diffuser from? looking at a very similar direction with mine .....

also i assume you have cold air feeds going up from each of your fog light covers?
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Old 17 September 2018, 09:20 PM
  #66  
MY94BlueWRX
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Hi Ash,

The front diffuser is a combination of a Seibon Carbon Lip, coupled with a custom made under tray and end plates.

The fog light inlets are actually brake ducts that feed air into the back of the hubs/bells.

Regards,
Kim
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Old 18 September 2018, 12:07 PM
  #67  
Ash Webster
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Originally Posted by MY94BlueWRX View Post
Hi Ash,

The front diffuser is a combination of a Seibon Carbon Lip, coupled with a custom made under tray and end plates.

The fog light inlets are actually brake ducts that feed air into the back of the hubs/bells.

Regards,
Kim
Interesting. The bumper I have has brake duct vents also linked into the wheel arch lining too... never thought about directing even more air through there too, too focussed on getting cold(er) air to the turbo!

Thanks for the info. Ill look into crafting one myself.

Ash
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Old 20 September 2018, 05:14 PM
  #68  
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amazing work

I always wanted to duct the hot rad air out of the side vents, but running lateral rad/ic combo its just impossible as there is no space to work with
I ended up fabbing front undertray to create high/low pressure for the rad/ic to work properly, but I did notice my oil temps went up few degrees, probably because there is no incoming air to cool the pan now, and I doubt my hood current configuration is able to suck all of that hot air out








I am thinking of making a vent with a lip in the undertray to help suck the hot radiator air out, but not sure if it will make things better or worse
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Old 20 September 2018, 06:11 PM
  #69  
MY94BlueWRX
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Nice work 👍

Itís still worth adding a vent into your undertray, as the low pressure air going under your car will draw the high pressure hot air out of the engine bay.

Iím going to be doing something similar, but I need to separate it from the underfloor air flow so it doesnít disturb the rear diffuser air flow.
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Old 20 September 2018, 07:48 PM
  #70  
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flat floor and rear diffuser is in my plans, just need to find time and inspiration

I am concerned that the underfloor low pressure air will be sucking air from the hood vents if I open up the undertray lol
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Old 20 September 2018, 09:09 PM
  #71  
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If thatís the case then happy days, as youíll have a through flow and your cooling issues are sorted.

Providing you achieve a flow out of the engine bay, to above or below then youíre sorted... obviously you need a feed/s into the engine bay to create high pressure, then it will always escape to the easiest low pressure region.
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Old 21 September 2018, 02:23 PM
  #72  
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I might get those hvac louvers since there are sold in any house appliances stores, and rivet them to the bottom of the underteay

next question I have in mind is location - put it right after the rad or move it backwards under the exhaust manifold
if I put it directly after the rad this could prevent air go towards the oil pan and it might heat up even more from the manifold
another concern is the decrease in downforce if you are pushing air through the bonnet to the ground

I need to build a wind tunnel

Last edited by powered by vodka; 21 September 2018 at 02:58 PM.
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Old 21 September 2018, 04:25 PM
  #73  
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Really nice build mate, awesome track car congratulations
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Old 29 October 2018, 10:32 PM
  #74  
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I've been meaning to ask you, have you logged any data prior and after your hood vent duct mod?
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Old 30 October 2018, 12:29 AM
  #75  
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At the time (a couple of years now) when testing with a magnahelic gauge, we just recorded the numbers by hand... so no log of data Iím afraid
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Old 30 October 2018, 12:33 AM
  #76  
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what about temperature changes?
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Old 30 October 2018, 08:38 AM
  #77  
MY94BlueWRX
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Which modification are you referring to, as there are three different vents that have been changed, all at different times for different reasons?

Last edited by MY94BlueWRX; 30 October 2018 at 08:38 AM. Reason: Spelling
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Old 06 November 2018, 11:27 PM
  #78  
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Love this project.
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