BRZ/FRS rear diffuser

[F1point4]

Excerpt from my Journal. Thanks @Wonderbar

#RaceCar

......I also got the Driveway Labs Diffuser Installed. It looks nice. Will find out if it makes a noticeable difference on the track next weekend. Thanks @Wonderbar for getting me one of your first units. The powdercoat finish is nice.....


Driveway Labs Rear Diffuser

20130921-DrivewayLabsDiffuser-004-Edit by VictorN07, on Flickr


20130921-DrivewayLabsDiffuser-012-Edit by VictorN07, on Flickr


20130921-DrivewayLabsDiffuser-015-Edit by VictorN07, on Flickr


20130921-DrivewayLabsDiffuser-018-Edit by VictorN07, on Flickr


20130921-DrivewayLabsDiffuser-023 by VictorN07, on Flickr

[womensecks]

Mmm.

Would love to see it wrapped in CF.

[F1point4]

Another Picture


20130922-Thirsty-001 by VictorN07, on Flickr

[SpeedyJay]

^I like it, very GT looking

IMO I would loose the mud flaps, GT cars don't normally have mud flaps

[Wonderbar]

Cfd data is back from @Hancha Group, stay tuned for some numbers.

[supramkivtt2jz]

Originally Posted by Wonderbar

Cfd data is back from @Hancha Group, stay tuned for some numbers.

very interesting...... cant wait to see the results.

[ATL BRZ]

In for aero data, I love those pretty vortices!

[Wonderbar]

Cfd teaser.

Reduced coefficient of drag.
Reduced coefficient of lift.
Aero balance moved rearward.

More to follow!

[u/Josh]

Originally Posted by Wonderbar

Cfd teaser.

Reduced coefficient of drag.
Reduced coefficient of lift.
Aero balance moved rearward.

I believe Hancha said before they have a flat bottom on their model of the car. I assume they changed that for this analysis? I look forward to the full explanation.

[Danny86]

Originally Posted by Wonderbar

Hey guys! So, I'm not an engineer or anything, just a self educated hobbyist and diy'er. I hate to see issues on my cars that could be fixed with a few hours and a hundred bucks.

I also hate to see fake or nonfunctional parts on cars. Our "rear diffuser" drives me nuts and in my opinion, it's a critical piece of both performance and visual on a sports car.

Here is my baseplate/prototype/version 1 of my diffuser for my car. I haven't riveted on the vanes for channels yet. The "R" cutout is to clear my Perrin exhaust, the front tabs bolt in the lower bolts on the rear sway bar, this closes nearly the entire open space in the rear bottom bumper and extends about 2 inches past the rear of the car. It doesn't follow the lines of the fake diffuser on the bumper, instead it creates a clean line on the bottom, where the OEM additional "diffuser" bolts on. Putting the exhaust inside of the air free cavity.

I built a similar panel for my 2006 eclipse using the tissue paper "tabs" and a gopro for testing.

It isn't close to finished, I'm doing a wrinkle coat black on the top and I'm planning on a gritted bed liner or flat black on the road side. Might leave it bare aluminum, haven't decided. This one is all built and bent by hand. Once I'm done tweaking, I'll do a nice laser cut one and anodize or powder coat it.

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This looks very promising. You mentioned you will be moving to NC? I live in NC. I would love to check the finished product in person. And I would definately consider purchasing this.

[Wonderbar]

Originally Posted by u/Josh

I believe Hancha said before they have a flat bottom on their model of the car. I assume they changed that for this analysis? I look forward to the full explanation.

They are continuing to build more detail into the model. I will have full data after the weekend.

That being said, a completely flat bottom model would render the diffuser less effective in the cfd because the entire car would essentially be a diffuser at that point.

[Wonderbar]

Originally Posted by Danny86

This looks very promising. You mentioned you will be moving to NC? I live in NC. I would love to check the finished product in person. And I would definately consider purchasing this.

I'm currently in NC. I live in raeford.

[u/Josh]

Originally Posted by Wonderbar

They are continuing to build more detail into the model. I will have full data after the weekend.

That being said, a completely flat bottom model would render the diffuser less effective in the cfd because the entire car would essentially be a diffuser at that point.

That's why I asked. If the model had a flat bottom then any changes they found would be due primarily to the diffusor sticking out beyond the bumper. I don't imagine they would do the analysis like that though. Again, glad you are doing the testing and I look forward to seeing the full post.

[plucas]

Originally Posted by u/Josh

I believe Hancha said before they have a flat bottom on their model of the car. I assume they changed that for this analysis? I look forward to the full explanation.

That was correct. I have been working on adding more detail to the underside of the model. Currently how it is (used for the testing) was simplified under the engine and back by the muffler area. I added the driveshaft tunnel with the driveshaft and exhaust routing. Wonderbar will release the data and figures for his diffuser when he gets all the information from me.