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BlueScooby's 06 STI - 03/16/19 Track Day Synopsis
BlueScooby's 06 STI - 03/16/19 Track Day Synopsis
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Old 10-28-15, 06:58 PM   #401
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Default Re: BlueScooby's 06 STI - Underbody Panels Phase 4 (rear diffuser)

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Originally Posted by SubySal View Post
If you wanted to check performance you could always tape or hot glue small lengths of string/yarn under the car then affix a hero cam under there. That will probably give you a good idea of how the air is flowing over the panels.
I do want to give that a try, but I've got to finish building the sucker first It'd be really nice to see clean airflow coming outta that diffuser...

Dropped the car off at the local subie shop for the coolant leak and axle boot while I am out of town for a client site visit tomorrow. Should be fixed before I get back

I'll put the bumper bottom back on and snap a picture of it mounted on the car too. Its going to look looooow Good thing that stuff is flexible, because its going to scrape on everything...haha
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Old 10-29-15, 05:00 AM   #402
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Default Re: BlueScooby's 06 STI - Underbody Panels Phase 4 (rear diffuser)

So my logic may be flawed but if you have the diffuser butted up to the flat bottom with end fences, you can set it to whatever angle you want (while keeping it lower). It doesn't need to be butted up to the bumper does it? I'm thinking of just having the exhaust above (inside) the diffuser. Maybe even have the diffuser extend past the bumper a bit.

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Old 10-29-15, 05:10 AM   #403
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Default Re: BlueScooby's 06 STI - Underbody Panels Phase 4 (rear diffuser)

This is kind of what I mean and this is my train of thought for my car.

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Old 10-29-15, 06:28 AM   #404
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Default Re: BlueScooby's 06 STI - Underbody Panels Phase 4 (rear diffuser)

I took a screen shot of this ridiculously amazing lotus. This is another example of what I mean.

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Old 10-29-15, 04:49 PM   #405
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Default Re: BlueScooby's 06 STI - Underbody Panels Phase 4 (rear diffuser)

No it doesn't need to be butted up against the bumper, I just think that looks more low-key

Even with the end fences, if you cant just run any angle you want... If i made my diffuser like 20-30 degrees there would be so much flow separation and turbulence that it would be like a parachute and no downforce

The pics you posted are diffusers in the 7-10 degree range many people stick to, so they cant come up to the bumper.

Extending the diffuser past the bumper is good though, because the diffuser length is proportional to downforce is generated, so longer is better!
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Old 10-30-15, 05:12 AM   #406
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Default Re: BlueScooby's 06 STI - Underbody Panels Phase 4 (rear diffuser)

Thanks for the info! What I was getting at is you could run less of an angle with it not butted up to the bumper
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Old 10-30-15, 07:22 AM   #407
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Default Re: BlueScooby's 06 STI - Underbody Panels Phase 4 (rear diffuser)

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Originally Posted by xirallicGDB-F View Post
Thanks for the info! What I was getting at is you could run less of an angle with it not butted up to the bumper
oh, right. yeah i considered doing that but that wasn't going to look as good and it was going to be harder to securely attach the diffuser... And I figure i'm only a couple degrees more than i probably need to be so its not that big of a deal to me. If I was building a legit race car, I would have done it different for sure.
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Old 10-30-15, 09:23 AM   #408
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Default Re: BlueScooby's 06 STI - Underbody Panels Phase 4 (rear diffuser)

Well I guess beauty is in the eye of the beer holder . I'm quite fond of that look but then again, I like the aggressive race car appeal! I'm excited to see your finished product though, no doubt it'll look great!
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Old 10-31-15, 05:17 PM   #409
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Default Re: BlueScooby's 06 STI - Underbody Panels Phase 4 (rear diffuser)

weekend update #1

Got the bumper bottom put back on, and it looks good!


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Old 10-31-15, 05:23 PM   #410
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Default Re: BlueScooby's 06 STI - Underbody Panels Phase 4 (rear diffuser)

weekend update #2

Finished cutting/fitting the passenger side end-fence today. It was a lot harder to fit than the drivers side... Got it on there though. The diffuser is really starting to come together!



When my boy got up from his nap this afternoon, he decided he wanted to help on the car


I didnt even direct him to do any of this, he just grabbed tools and started "working" haha


We went out later, so I took a snap from the road


And finally, here is a random pic of the car on a lift from last week. Slightly better shot of the underbody than I normally get...
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