Rear Air Diffuser!

[dgraf]

Would anyone buy one here if it was made? Carbon fiber ~ 250 and fiberglass ~ 160. I am asking this because I am thinking about doing a production on them. I know you would have to see it to really tell me if its worth the money though. I am just trying to get a feel for how many people would be actually willing to buy one and if there is a market for one.

I know DG motorsports makes one that you install by cutting out the existing black part of the bumper. However, this one will bolt to the bottom of your existing bumper, but you would have to drill maybe 4 small holes on the bottom. You wont see the holes if you were looking at it from the top.

If I get a 3d model of it done soon I will post it.

[strytnyne]

i would there are pretty much no rear lips made for this car so something to make the rear more aggresive would be nice

http://www.speedalliance.com/images/JS_RACING/S2000_Rear_Diffuser_FRP_1.jpg pure win

[jam_asian85]

This seems interesting.

[BSTD3]

Kiz-zarbon fiz-ziber FTW!

[UHATEIT]

i have the front lip and side skirts, I have been waiting for a fucking rear lip, add-ons, or difuser to come out so I can buy one!

I refuse to pay the price for the DG or the re-amemeyia, both are ugly and way overpriced. Something in the $100-200 range would be nice. Something like the fiberglass one showen above on that s2000, except not so low.

[PCspeed3]

yeah our cars look unforutanely similar to a MZ3 hatch from the rear IMO, that would be nice. Maybe you could get out a few different concept/rough draft photos to see what the we like...?

[Moxhair]

as long as its functional and not just a bumper ornament

[SHaW]

I agree. As long as it is functional and not just for show.

[Sport6]

Testing to see if its functional would be pretty hard for a small scale production..

[SHaW]

True. The DG motorsports one does not look too bad:
http://www.dgmotorsports.com/images/m3reardiff500.jpg

[MakeMeGoFast]

not trying to take this off topic but wouldn't the whole underside of the car need to be flat to make the rear diffuser effective?

[Moxhair]

Not necessarily

With a rear diffuser you are helping the air underneath the car transition to the air behind the car creating less turbulent air and more downforce, also it helps to stop the parachute affect of the air moving under the car getting caught up in the rear bumper.

Having the entire bottom of the car flat would only help the aerodynamics and the transition of air.

Not like most people would ever see the benefits of any of this as rarely are you performing at speeds where this kind of aero comes into affect.

[MakeMeGoFast]

figured that, wasn't sure though

[mr_mazda329]

I think Carbon fiber and fiber glass are too brittle. ABS plastic would be better.

[AllLostThings]

I would be interested to see a prototype and check it out.

[o.g.sk8er]

one of our members has a home made diffuser...looks pretty nice if you ask me. no idea if its functional or not.

http://www.moccforums.com/forums/index.php/topic,9144.0.html

[PCspeed3]

yeah what is all this talk about functional?

I could only see it being functional if you were trying to set a land speed record or something, they reduce lift and drag. Its not like you are going to shave .5 second off you 1/4 mile time with a diffuser lol

"thank god I have that rear diffuser or i would have lost the race"

[Snyeed]

I want I want I want I want I want.

http://farm4.static.flickr.com/3005/2897303151_b90c55f18f_o.jpg

http://img.villagephotos.com/p/2006-5/1181325/IMG_0154.jpg

[opt_ms3]

can I has?

[PCspeed3]

please dont make it like that evo and Sti, the last thing i want is a gigantic cheese grader on the back of my car, no offense but those arn't my style.

[03.5-dc-speed]

I want I want I want I want I want.

http://farm4.static.flickr.com/3005/2897303151_b90c55f18f_o.jpg

http://img.villagephotos.com/p/2006-5/1181325/IMG_0154.jpg


wow i want too!


that evo of course! but i want to see one before i get.

[03.5-dc-speed]

^those ones look like they are functional!

[SHaW]

Those look horrible.

[Moxhair]

yeah what is all this talk about functional?

I could only see it being functional if you were trying to set a land speed record or something, they reduce lift and drag. Its not like you are going to shave .5 second off you 1/4 mile time with a diffuser lol

"thank god I have that rear diffuser or i would have lost the race"

Some people road race and autocross and any additional downforce and reduction in drag would be beneficial... but as I stated earlier the number of people who would benefit from it is minimum.

I just wouldn't install anything onto my car that isn't functional.

[MM BOOST]

the ones on that evo and sti are sick, I would be interested in a diffuser if it came out for the ms3.

[Jasnall]

It would be nonfunctional, unless you had the time and money to do full scale aero testing. More of a aesthetic mod bordering "ricey" imo.
Functional aesthetics = Good
Non-functional aesthetic = (yupnope)

[dgraf]

I was thinking about something like this.


http://img.photobucket.com/albums/v419/lastplacex/rear_air_diffuser_1.jpg
This is looking at it from the rear

http://img.photobucket.com/albums/v419/lastplacex/rear_air_diffuser_2.jpg
bottom looking from the front

http://img.photobucket.com/albums/v419/lastplacex/rear_air_diffuser_3.jpg
and just bottom

I didnt want it to go all the way to the rear axle because it would need more support which would ask for more drilling.

[Snyeed]

The pics of the Evo and STI diffuers is a 2 piece setup, the sharkfin is one piece and the swoop looking diffuser is another.

I think it looks like sex on the EVO and STI!

[opt_ms3]

I like that mock-up, I'm down.

[Kain]

Wind tunnel testing figures?

http://www.a2wt.com/images/A2web/A2%20Wind%20Tunnel%20Test%20Section.JPG

[mr_mazda329]

Wind tunel a must...

[dgraf]

negative 1000N drag! I MEAN NEGATIVE 1000 APPLES WORTH OF DRAG! ALSO AN INCREASE OF 500 APPLES OF DOWNFORCE! This aero piece is a must for racing.

jk.

I could probably get out a few theoretical numbers for you. I am almost certain though that none of those mazdaspeed 3 aero parts like side skirts or front lip do anything to your aerodynamics.

[PCspeed3]

My suggestions for a diffuser would be a simple style with vertical fins, much like that sketch posted earlier. Those diffusers like the ones on the Evo an Sti would only look good on our car if we had a full aero bodykit to compliment it IMO. If you just have some big carbon fiber diffuser hanging off the back with nothing else to compliment it, its going to look silly.

Example: http://forums.evolutionm.net/evo-show-shine/394147-05-ww-modded-8-bumper.html

http://www.aprperformance.com/index.php?option=com_content&task=view&id=69&Itemid=47

[wisniaPl]

I think Carbon fiber and fiber glass are too brittle. ABS plastic would be better.

I think abs its the best because it wont crack and it will bend

[strytnyne]

negative 1000N drag! I MEAN NEGATIVE 1000 APPLES WORTH OF DRAG! ALSO AN INCREASE OF 500 APPLES OF DOWNFORCE! This aero piece is a must for racing.

jk.

I could probably get out a few theoretical numbers for you. I am almost certain though that none of those mazdaspeed 3 aero parts like side skirts or front lip do anything to your aerodynamics.


there arent many to choose from =)

[dgraf]

haha there are a few...maybe like 10 total

[strytnyne]

lol where do u get 10 from theres the re lip which is too expensive, gv alot of people have , and dg is just ugly looking, weirdly all 2 letter companies.. if the diffuser looks good i know someone will buy it.. only a handful of people would care if its truely functional as long as there is no added drag

[dgraf]

oh well i was counting like...that front lip and side skirts from the ebay company, the autoexe bumper and the rest of the stuff from dg.

Anyways, I found a manufacturer for this product and he seemed thrilled about it. It'll be made out of 1/8" ABS plastic. I am going to send him a detailed cad file so I can get a quote from him. Looks like it will be quite expensive for the mold though.

[strytnyne]

any pics =)

[dgraf]

you want different ones than page 2?

[strytnyne]

no of the ones, your planning to produce

[dgraf]

well thats all i have right now...

[Sport6]

how are you going to make this? A mold or by hand? I will mock up something that I think would be nice, just reinstalled xp so need to find my solidworks disc... Basically the piece on the bumper now changed a bit but still has the same mounting tabs.

[Sport6]

Something I came up with quickly. The place would replace the bottom piece of the bumper, the part that snaps in. (the part that makes it different from the regular 3).

I made it roughly the same as the current part but with a bit of the diffuser look to it. Just showing what I think would be easy to install and look like it belongs there since you wont have to drill or screw it into the actual bumper.

http://farm4.static.flickr.com/3533/3215535203_a7c5463d14_b.jpg

[MM BOOST]

yea but then it would just look stock with a few of the vertical slits in it. I think if we are gonna have something made and pay money for it, I think it should hang lower and give the rear end a more aggressive look especially considering we don't have any rear add on's, kits, or lips for the ms3 to make it look lower to match the front lips and sideskirts available for this car. Very nice sketch tho man, gotta hand that to you!! But I think we need something more aggressive and something that will hang lower.

[Sport6]

Well thats the beauty of using that piece though, it can hang lower if you want, just saying it should be made to fit where that piece went. Like design it to replace that piece but still have stock style mounting.

[Sport6]

I guess what I am saying is something similar to the DG motorsports one without having to cut anything.

[strytnyne]

more like this =D
http://img.photobucket.com/albums/v202/djchesta/DCUPS/IMG_3067.jpg

[squidmotion]

EWE

and i really, really, really love that rubber just barely clinging to the rim there... classy, all the way... (FAIL)


aussies are never afraid to have too much fun... where did you find that photo, 'nine?

there are so many things wrong with that photo.... the all black badges, EXCEPT for the M. the wing, the rubber, the crazy cartoon camber, that wrong ass hanging off the back, that 'stab it through there' muffler, the 'i date a stripper' plates, 'reverse spider with red eyes' tail light treatment... heheheehe...


:)

[Sport6]

I think that rx7's diffuser makes the car look super cheap. The piece looks poorly made.

[strytnyne]

EWE

and i really, really, really love that rubber just barely clinging to the rim there... classy, all the way... (FAIL)


aussies are never afraid to have too much fun... where did you find that photo, 'nine?

there are so many things wrong with that photo.... the all black badges, EXCEPT for the M. the wing, the rubber, the crazy cartoon camber, that wrong ass hanging off the back, that 'stab it through there' muffler, the 'i date a stripper' plates, 'reverse spider with red eyes' tail light treatment... heheheehe...




:)
lol in a extreme wheel fitment thread xD(shocked)

[MakeMeGoFast]

I'd say incorporate the your 1st design and the design in post #44 and you'd have yourself a pretty good start

[dgraf]

I will see what I can do about scanning the rear piece that clips in so I can have it accurate.

[MM BOOST]

Well thats the beauty of using that piece though, it can hang lower if you want, just saying it should be made to fit where that piece went. Like design it to replace that piece but still have stock style mounting.

I agree 100% bro. Very good idea!! Let's make this happen! (yippy)

[PCspeed3]

I like your latest sketch, fiberglass FTW! FLM! (for less money) lol

[SHaW]

The image in post #44 looks pretty sweet~ Looks like this thing is looking better and better. :P

[jodacoto]

(kiss)

[Snyeed]

Great Idea to use the stock piece in a way, OEM mounting is the way to go! I think the fins should be more aggressive but its a good start.

[mazdaspeed32007]

My suggestions for a diffuser would be a simple style with vertical fins, much like that sketch posted earlier. Those diffusers like the ones on the Evo an Sti would only look good on our car if we had a full aero bodykit to compliment it IMO. If you just have some big carbon fiber diffuser hanging off the back with nothing else to compliment it, its going to look silly.

Example: http://forums.evolutionm.net/evo-show-shine/394147-05-ww-modded-8-bumper.html

http://www.aprperformance.com/index.php?option=com_content&task=view&id=69&Itemid=47

i took a huge dump this afternoon and it looked just like that dudes evo. what a pos. oh man. funny what people do with their money. oh man. i bet he looks out his window, or when he walks away, at his car and is like....sweeet. lol.

[PCspeed3]

i took a huge dump this afternoon and it looked just like that dudes evo. what a pos. oh man. funny what people do with their money. oh man. i bet he looks out his window, or when he walks away, at his car and is like....sweeet. lol.

I know, i wasint saying it was amazing looking, I was just using his rear diffuser as an example. Too bad his evo would kill both of our MS3's combined......haha

[daonly1around]

i'd be interested... probably would paint it black if its FG... if its CF, i may still be interested pending price

[john blutarski]

If I can get wind tunnel test results and a price of under $100... I may be interested... maybe.

[MM BOOST]

If I can get wind tunnel test results and a price of under $100... I may be interested... maybe.

Good luck with that!

[Fenrir]

That poor, poor RX-7 :(

[MM BOOST]

BUMP!! We need to get this made!

[wisniaPl]

more like this =D
http://img.photobucket.com/albums/v202/djchesta/DCUPS/IMG_3067.jpg

nice rx7 i like the wheels but this wing wtf stock one loosk so much nicer

[MakeMeGoFast]

dont think this guys is really going for the stock look

[Quiksilver05]

Subscribed! We need a rear bumper baaaad! I would hate to get the DG one and cut it all up!

[nighthawk358]

i personally would prefer oem fitment with an aggressive look

[SBSPEED3]

This car is not fast enough to justify or benefit from a rear diffuser, pluse there isno supporting under body panels to make it do anything. It would be a purly asthetic thing. To me this seems a little rice, like putting a massive wing on a scion or something... The only body work i would do on this car would be to debadge and fill the holes in the hatch and to get the front grill that doesn't have the mazda logo on it if anyone made those for a reasonable (non dealer) price I would be interested!
$0.02 not trying to be a dick, just stating my opinion

[MADTIG]

http://i43.tinypic.com/2vcdrn9.jpg

http://i44.tinypic.com/29xc50y.jpg

I would like something like the evo voltex or the dg...but a lil less pricey or cf for a price like that.

[ericrapp]

I am interested, if it is functional. We already have the undertray from the factory smoothing airflow under the motor so it seems a shame not to have the rear diffuser to finish out the thought. Even though my car is quite stable at speed, it looks like the stock rear bumper just catches the air instead of letting it exit the underside smoothly. Most folks probably would not make use of improved aero, but some of us would love some! This becomes more important as the car is lowered. My 2 cents too.

[H3br3w_Ham3r]

True. The DG motorsports one does not look too bad:
http://www.dgmotorsports.com/images/m3reardiff500.jpg

PLEASE NOTE: You will have to alter (cut) your current bumper to install this part.

From the DG motorsports website

[andyspeed3]

i like that dg rear diffuser but it runs a lil expensive. if they made the rear diffuser like the evo one but the dg one, i think that itll look nasty on a tr speed(nana)

[schlepperock]

http://i1210.photobucket.com/albums/cc404/Schlepperock/dca41f77.jpg
From seller realcarbonfiber on eBay.
I talked to this guy about making other parts and setting up a group buy.