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Old 10-02-2012, 01:10 PM   #101
TweekedXXII
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Awesome stuff! Between this and the side skirt mod Fat Black Pig Sack did, I've found some more mods to do...
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Old 10-02-2012, 03:16 PM   #102
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Looks mean sir, good job!
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Old 10-02-2012, 03:23 PM   #103
waynlewis
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Quote:
Originally Posted by ImNOrobo View Post
I almost finished my diffuser today. It should be finished tomorrow after work. This is the last mock up before mounting the fins and screwing in the diffuser.

I used your idea with plastic but found a local plastic company that sold celtic. It is expanded PVC which is pretty awesome to work with so far. I am still under $100 and have enough material to make a second one.

Pics are a little dark but it is looking pretty good now.

Great looking project. How were you able to make to bend it and mold it to the bumper like that?? Are you planning to do a write up?

And to the OP. Great project yourself, and also your bottom line side skirts.
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Old 10-02-2012, 03:45 PM   #104
dacib
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Subscribed.
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Old 10-02-2012, 05:03 PM   #105
ImNOrobo
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Oh, It's a JDM STI?
Pretty close.

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Quote:
Originally Posted by waynlewis View Post
Great looking project. How were you able to make to bend it and mold it to the bumper like that?? Are you planning to do a write up?

And to the OP. Great project yourself, and also your bottom line side skirts.
The material can be bent under heat. Once it cools it keeps that shape. This material is pretty awesome to work with. I could do a write up but it is about the same as this write up with a few minor differences.


Here we go as promised. Now that I see it in the daylight there is a few more minor flaws I wish I could fix. I am leaving how it is. I am going to black out the screws though.





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Old 10-02-2012, 08:48 PM   #106
211STi
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Incredible skills! Now, to replicate this and make a fiberglass mold....
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Old 10-02-2012, 10:24 PM   #107
ImNOrobo
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Pretty close.

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Ha ha. I thought about doing that instead of this but this worked out just fine. Cheap and pretty easy. I started with cardboard for the template and placed the template over the actual material and made my cuts.

Thanks fat black for the idea of plastic, this celtic was a **** load easier than fiberglass.
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Old 10-03-2012, 03:14 PM   #108
waynlewis
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Do you have a link to the celtic, I'm not having any luck finding it. Thanks
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Old 10-03-2012, 03:43 PM   #109
ImNOrobo
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I got it locally. Look up plastic board in your area. I got mine from www.norvaplastics.com It is only a mile or two away from my house. I called them and told them what I needed it for and that is what he recommended I use. I'm sure there is something or someone that can you out down there.
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Old 12-13-2012, 01:14 AM   #110
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sub'd
Definitely gonna try this in the new year, soon hopefully.

Edit: Got an idea of my own for this. Pretty sure I'll get some flaming for it but I will show it here if I get around to making one.
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Old 12-13-2012, 02:41 PM   #111
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Great craftsmanship but are either of this functional at all ? Will it rip off at 100+ mph ? Does it actually stop the air exiting the underside of the car from tumbling and swirling, reducing vacuum under the car? Air flowing under the car's front bumper compresses and speeds up to squeeze between the car and the ground. Does thisA diffuser create a tunnel or void in the floorpan that allows air to expand and create a vacuum under the chassis.

Again great craftmanship but does it work ?
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Old 12-13-2012, 03:06 PM   #112
Counterfit
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There's no way a diffuser on its own is going to stop air underneath the car from tumbling. There also doesn't need to be a void to create a low pressure zone underneath. You can even test this with a bathroom hand dryer.
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Old 12-13-2012, 03:16 PM   #113
ImNOrobo
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Oh, It's a JDM STI?
Pretty close.

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I buillt a second version of mine, looks the same but the fins are little longer (pic below). The front of mine goes all the way to the rear diff and tucks up. The sides near the wheels also tuck up, the air has to go under diffuser. I have gone 150 (not on the streets) and haven't had any issues, this was on the first version and this new one is better. When there is rain/moisture on the ground I have noticed the air doesn't swirl as much as it used to. If that helps.

This is mostly for looks but if it is functional that is a bonus, I saved myself a **** load of money either way.


Last edited by ImNOrobo; 12-13-2012 at 03:31 PM. Reason: poor grammer
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Old 12-13-2012, 03:25 PM   #114
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Quote:
Originally Posted by Counterfit View Post
There's no way a diffuser on its own is going to stop air underneath the car from tumbling. There also doesn't need to be a void to create a low pressure zone underneath. You can even test this with a bathroom hand dryer.
I am talking about the air leaving the rear of the car and tumbling/swirling against rear bumper. i don't really have time to find diagrams. the rear diffuser will not stop the tumbling air if their is no front Aero or underpanels.


RIF:

Great craftsmanship but are either of this functional at all ? Will it rip off at 100+ mph ? Does it actually stop the air exiting the underside of the car from tumbling and swirling, reducing vacuum under the car? Air flowing under the car's front bumper compresses and speeds up to squeeze between the car and the ground. Does thisA diffuser create a tunnel or void in the floorpan that allows air to expand and create a vacuum under the chassis.

Again great craftmanship but does it work ?
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Old 12-13-2012, 03:34 PM   #115
ImNOrobo
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Oh, It's a JDM STI?
Pretty close.

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A front splitter is in the works for me along with panels for underneath the car, like the sti had from the factory (only better). I do race/autocross the car, so having something that is functional is beneficial to me.
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Old 12-13-2012, 03:39 PM   #116
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Quote:
Originally Posted by ImNOrobo View Post
A front splitter is in the works for me along with panels for underneath the car, like the sti had from the factory (only better). I do race/autocross the car, so having something that is functional is beneficial to me.

Yeah Aero is Fundamental. i am working on mine for my Time Attack Car
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Old 12-13-2012, 04:12 PM   #117
ImNOrobo
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Yeah, you bought Matt's old car right? The flat black STI from the hampton roads area?? You need more aero for the power you have.
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Old 12-13-2012, 04:19 PM   #118
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yeah, Well it runs on E85 with a VERY different engine in it.
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Old 12-13-2012, 06:39 PM   #119
KeithS05RS2.5
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Quote:
Originally Posted by FjStix View Post
I am talking about the air leaving the rear of the car and tumbling/swirling against rear bumper. i don't really have time to find diagrams. the rear diffuser will not stop the tumbling air if their is no front Aero or underpanels.


RIF:

Great craftsmanship but are either of this functional at all ? Will it rip off at 100+ mph ? Does it actually stop the air exiting the underside of the car from tumbling and swirling, reducing vacuum under the car? Air flowing under the car's front bumper compresses and speeds up to squeeze between the car and the ground. Does thisA diffuser create a tunnel or void in the floorpan that allows air to expand and create a vacuum under the chassis.

Again great craftmanship but does it work ?


We should ask him after his next visit to a wind tunnel
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Old 12-13-2012, 06:53 PM   #120
PjkFisher
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This actually looks pretty awesome. Great work too. Props on the DIY.
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Old 12-13-2012, 11:54 PM   #121
ImNOrobo
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Oh, It's a JDM STI?
Pretty close.

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I always wondered how many of the aftermarket diffusers are actually tested for functionality, my guess is very few. I don't think they even cover as much area as mine does, in fact the few I have seen in person is nowhere near as much coverage.

Anyone interested in making something like this should try it, its not that hard.

Sorry for the thread jack fat black, you don't seem to answer as many questions as I have.
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Old 12-14-2012, 03:16 AM   #122
DDabs
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I want this on my hatch ughhhh
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Old 12-14-2012, 03:27 AM   #123
RSTM
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wow this is awesome! Def going to have to try it out on my GC! They don't make any good diffusers for them!

EDIT: oh and for all of you that can't find the board that the OP used for his; it's just simple thick poster board. Lol go to the school supply section of either Wal-Mart of Staples/OfficeMax and grab some. All sorts of colors. I'll probably use black so I don't have to use a lot of undercoating.

Last edited by RSTM; 12-14-2012 at 03:54 AM.
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Old 12-15-2012, 12:44 AM   #124
Fat Black Pig Sac
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yes, it's a poster board, covered with multilayers of fiberglass resin
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Old 12-16-2012, 02:34 AM   #125
spazsubaru
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ughh I want to make this before snow hits! to bad no one is marketing these :b. maybe I wont feel lazy in a day or two and get these supplies. Amazing DIY
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