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Tracking / Autocross / HPDE / Drifting What these cars were built for!


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Old 11-21-2020, 01:00 PM   #1
snuff58
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Spoiler / wickerbill

Well, I believe I've come to the point in my tracking adventure that I am researching aero: adding a splitter and spoiler (not a wing) and maybe rear diffuser.

Looking for others'experiences, recommendations, warnings, etc.

Planning on making the splitter.

Looking for a spoiler just large enough to be able to add an adjustable strip to it's rear surface.

MY14 BRZ

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Old 11-21-2020, 01:20 PM   #2
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Here are a couple I like:





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Old 11-21-2020, 01:32 PM   #3
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The first looks too narrow. What's the second one? I like the last two.

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Old 11-21-2020, 02:27 PM   #4
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norcalpb
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The first looks too narrow. What's the second one? I like the last two.

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Second one is Perrin.

Verus was nice enough to do some virtual air flow testing on it:

https://www.verus-engineering.com/bl...ap-analysis-31

I’m iffy on it because it may produce a ton of drag at high speed, which our little engines don’t like. But real world application can always differ.
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Old 11-21-2020, 02:49 PM   #5
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Not the Perrin unit, it mounts on the OE spoiler. I will remove my OE spoiler.

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Old 11-21-2020, 02:54 PM   #6
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I can't find the second one (no name or logo) as Perrin. Would it mount directly on the back of the trunk lid?

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Old 11-21-2020, 02:58 PM   #7
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The Perrin unit that mounts on the OE spoiler is listed as DISCONTINUED on 86speed website.

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Old 11-21-2020, 07:06 PM   #8
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Quote:
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norcalpb
Not the Perrin unit, it mounts on the OE spoiler. I will remove my OE spoiler.

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Quote:
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norcalpb
I can't find the second one (no name or logo) as Perrin. Would it mount directly on the back of the trunk lid?

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Quote:
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The Perrin unit that mounts on the OE spoiler is listed as DISCONTINUED on 86speed website.

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Well would you look at that, it is finally a discontinued product. And no I don't think it would fit without the stock spoiler like it is intended to be.

You can also try your hand in making your own, similar to this:

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Old 11-21-2020, 08:20 PM   #9
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I think I'll look for a low profile unit to mount on the lid that will allow me to add a strip to it's back

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Old 11-22-2020, 02:56 AM   #10
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949 Racing project car:
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Old 11-23-2020, 12:53 PM   #11
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Why are you so against adding a rear wing element?

Spoilers like the 949Racing car result in a high drag effect as a results of a massive wake zone immediately behind the element itself.

My Versus front splitter + UCW Rear Wing at 6* AOA resulted in 2 mph less VMax at Mid-Ohio (122 vs 120 mph) into China Beach and still was ~1.5 seconds faster on the same tire same conditions.
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Old 11-23-2020, 04:55 PM   #12
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You just made me realize that an adjustable rear wing could be moved to a lower drag config for the drive home because mpg because I'm driving this car Monday morning too...
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Old 11-23-2020, 05:05 PM   #13
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You just made me realize that an adjustable rear wing could be moved to a lower drag config for the drive home because mpg because I'm driving this car Monday morning too...
Right, when I tow my car I throw my wing back to 0 AOA. I haven't really noticed any MPG hit on the towing aspect. DDing around back and forth to work (35 mph roads 10 miles total) I still get 28-29 MPG. Nothing abnormal.

Those type of spoilers do great at low speed (think all Street Prepared style classes). Anything above 60+ you're going to see a massive negative impact
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Old 11-23-2020, 05:59 PM   #14
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Originally Posted by norcalpb View Post
Second one is Perrin.

Verus was nice enough to do some virtual air flow testing on it:

https://www.verus-engineering.com/bl...ap-analysis-31

Iím iffy on it because it may produce a ton of drag at high speed, which our little engines donít like. But real world application can always differ.
The drag from it is not bad. I have had one for years.

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You just made me realize that an adjustable rear wing could be moved to a lower drag config for the drive home because mpg because I'm driving this car Monday morning too...
That is what I am planning to do with my GTC200. The drag from it is bad at minimum AOA. Going to build custom mounts with more adjustment.
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