Underbody Aero Thread (splitters, panels, vortex generators) - Page 5 - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


General Miata Chat A place to talk about anything Miata

Reply
 
 
 
LinkBack Thread Tools
Old 03-25-2009, 05:40 PM   #81
Junior Member
iTrader: (4)
 
Join Date: Mar 2009
Location: Rockville, MD
Posts: 292
Total Cats: 0
Default

has anyone cut their rear bumper to make it higher and completed it with an angled diffuser?
DazedandConfused is offline   Reply With Quote
Old 03-25-2009, 06:09 PM   #82
Guest
iTrader: (1)
 
ray_sir_6's Avatar
 
Join Date: Dec 2006
Location: DFW, TX
Posts: 714
Total Cats: 0
Default

I'm in the design phase for the rear diffuser. Nothing built yet, but it will be ready soon enough.
ray_sir_6 is offline   Reply With Quote
Old 03-30-2009, 02:07 AM   #83
Senior Member
iTrader: (1)
 
Join Date: May 2008
Location: south texas
Posts: 1,419
Total Cats: 9
Default

i bought thin sheet aluminum from a local metal supplier for $25. last time i was there the sheet they had was bigger and i paid $65 but i made a diffuser out of it too! those places always have scraps (portions of a 4x8 sheet) for cheap.

i can honestly say the difference, even on the highway, is night and day. my car will not budge 1 inch even in a serious crosswind (40mph +) driving 60mph and above. i bent up my old one (splitter) at vir last oct. and hadn't had it on for the last few months. and i just recently cutout a new one, and it's so stable and drives perfectly straight, it's amazing. i make zero steering corrections when driving at speed now.

here's a few pics: btw, i have it held on at 4 points, 2 stock on the ends and 2 i made from allthread and washers/nuts, with a couple L shaped brackets bolted to factory threaded holes in the bumper support. it comes off in under 3min. and was so strong it only bent the corner up when i went over the curbing in turn 2 at VIR! (4 wheel off)

Name:  splitterdiffuserpics010.jpg
Views: 68
Size:  39.3 KB

Name:  splitterdiffuserpics009.jpg
Views: 66
Size:  34.4 KB

Name:  splitterdiffuserpics011.jpg
Views: 62
Size:  73.1 KB

this is a pic of the splitter with an air dam i made to lower the frt. end of the car for fast tracks.

Name:  miataairdam.jpg
Views: 66
Size:  12.0 KB

here it is at the track with the airdam/splitter painted. also ran my diffuser and ebay carbon wing with custom alum. legs.

Name:  DSC_0992.jpg
Views: 72
Size:  116.7 KB

Name:  DSC_9739.jpg
Views: 62
Size:  159.8 KB

i think i'm gonna make some slightly larger end plates for the wing, also gonna open up the rear bumper to keep it from catching air. either holes or slots/grille material
spoolin2bars is offline   Reply With Quote
Old 03-30-2009, 02:26 AM   #84
Senior Member
iTrader: (1)
 
Join Date: May 2008
Location: south texas
Posts: 1,419
Total Cats: 9
Default

couple more pics:

Name:  splitterdiffuserpics023.jpg
Views: 63
Size:  50.9 KB

Name:  splitterdiffuserpics019.jpg
Views: 63
Size:  77.6 KB

same idea on rear diffuser mounting. 4 points, 2 factory bolts (rear brace 17mm bolts) and 2 L brackets ( bolted to factory tow hook mounting bolts) with allthread and washers/nuts. the allthread makes it adjustable, although i always just put it flush with the bottom of the bumper since i read that too much angle will hurt instead of help. the way it is angles it about 5 degrees.

Name:  splitterdiffuserpics015.jpg
Views: 61
Size:  54.8 KB

Name:  splitterdiffuserpics014.jpg
Views: 63
Size:  39.6 KB

Name:  splitterdiffuserpics013.jpg
Views: 58
Size:  69.8 KB
spoolin2bars is offline   Reply With Quote
Old 03-30-2009, 01:20 PM   #85
Elite Member
iTrader: (10)
 
rccote's Avatar
 
Join Date: Jan 2008
Location: Buffalo NY
Posts: 1,595
Total Cats: 17
Default

Moar pics of assend + info on diffuser plz.
rccote is offline   Reply With Quote
Old 03-30-2009, 02:05 PM   #86
Junior Member
iTrader: (4)
 
Join Date: Mar 2009
Location: Rockville, MD
Posts: 292
Total Cats: 0
Default

it looks good. definitely not streetable around here though.
DazedandConfused is offline   Reply With Quote
Old 03-30-2009, 03:27 PM   #87
Junior Member
 
Join Date: Sep 2008
Location: ATL GA
Posts: 290
Total Cats: -217
Default

great work spoolin! i want the same thing for my car. i am looking for a sheet of aluminum now and will start to make one soon.
locomonkeyboricua is offline   Reply With Quote
Old 03-30-2009, 03:40 PM   #88
Senior Member
iTrader: (21)
 
Join Date: May 2008
Location: San Antonio
Posts: 712
Total Cats: 16
Default

I second the aluminum...if supported properly. I've had mine up to +150mph (on the track) on the cobra and I wouldn't drive the car again w/o it. Miata is pretty much the same.

Dig around over at http://www.corner-carvers.com/forums/ for more aero tech....it's been discussed to death.



rlogan is offline   Reply With Quote
Old 03-30-2009, 07:05 PM   #89
Tour de Franzia
iTrader: (6)
 
hustler's Avatar
 
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,114
Total Cats: 351
Default

I need some aluminum welding equipment.
hustler is offline   Reply With Quote
Old 03-30-2009, 07:20 PM   #90
Senior Member
iTrader: (21)
 
Join Date: May 2008
Location: San Antonio
Posts: 712
Total Cats: 16
Default

That's actually steel...I do have an aluminum mig gun though....I want a TIG though...maybe after Miata is done...
rlogan is offline   Reply With Quote
Old 03-30-2009, 09:37 PM   #91
Senior Member
iTrader: (1)
 
Join Date: May 2008
Location: south texas
Posts: 1,419
Total Cats: 9
Default

Quote:
Originally Posted by rccote View Post
Moar pics of assend + info on diffuser plz.
i'll take a few more pics since i have it off right now. i had the main piece bent to make the ends. the center dividers are bolted on with stainless bolts and nuts. (nylon locking)
i could have welded or riveted them on but i was afraid i might bang them up and have a hard time replacing them. i actually haven't bent the centers but the ends have been bent a few times before backing out of steep driveways. but it only takes a couple minutes to flatten them out and spray blk. again.

i am making some side pieces to finish sealing off under the rear bumper now that i have some extra material from my new splitter and i'll be cutting out the bumper to release trapped air.

here's a couple pics where you can see the forward mounting points. they are the 2 17mm bolts that hold the rear bracing on.

Name:  splitterdiffuserpics020.jpg
Views: 58
Size:  39.0 KB

Name:  splitterdiffuserpics016.jpg
Views: 58
Size:  73.9 KB

Name:  splitterdiffuserpics017.jpg
Views: 64
Size:  59.7 KB
spoolin2bars is offline   Reply With Quote
Old 08-18-2009, 12:59 AM   #92
Junior Member
iTrader: (7)
 
Join Date: Aug 2006
Location: Binghamton, NY
Posts: 448
Total Cats: 1
Default

Bringing back an oldie but goodie....

Savington, any thoughts towards canards to aid in airflow over the spats? I shattered my air dam awhile back and am in the middle of a rebuild. I've added the spats to cover the front tires, and was considering the canards as a drag reduction device. Still not too sure what I think though.

--Alex

Last edited by AlexO35; 08-18-2009 at 11:50 AM.
AlexO35 is offline   Reply With Quote
Old 08-18-2009, 04:19 AM   #93
Senior Member
iTrader: (1)
 
Join Date: May 2008
Location: south texas
Posts: 1,419
Total Cats: 9
Default

a canard creates downforce. if anything it might ADD drag. if your worried about the spats making drag, not sure canards would help you. are the spats at a 90deg. angle sticking straight out? best bet would have been to make them slope outward. think of the shape of the newer bug deflector's on truck's. only this would be vert. instead of horizontal. good luck.
spoolin2bars is offline   Reply With Quote
Old 08-18-2009, 03:26 PM   #94
Junior Member
iTrader: (7)
 
Join Date: Aug 2006
Location: Binghamton, NY
Posts: 448
Total Cats: 1
Default

I'm not worried about the spats increasing drag really. The way I understand it, they are a drag reducing component. Even though they are quite vertical, (they do curve with the fender well) it is the same frontal area as the open tire, yet less drag than the rotating tire.

What I was hoping, is that a canard may help the air "up and over" the spat. My understanding on canards is that they are not really downforce creating additions. (though they do create some DF, its not thier main purpose) They are designed more to swirl the air flow to prevent it from finding its way under the side skirts.

--Alex
AlexO35 is offline   Reply With Quote
Old 08-19-2009, 03:02 AM   #95
Newb
 
Join Date: Sep 2008
Location: Moraga, CA
Posts: 39
Total Cats: 0
Default

Ok, I know we are talking about under body aero improvements here, but when the issue of having an open top came up it got me thinking, and I'm sure someone has already though of this, but has anyone attempted to make a hard top that tapers back like a z4 for example? I think it would have a significant affect on the under body aerodynamics over the standard hard top.
swerv_on is offline   Reply With Quote
Old 08-19-2009, 03:38 AM   #96
Elite Member
iTrader: (28)
 
Join Date: May 2008
Location: St. Augustine FL
Posts: 2,310
Total Cats: 2
Default

SEARCH BUTTON!!! AUTOKONEXION makes them....
p51hellfire is offline   Reply With Quote
Old 08-19-2009, 03:44 AM   #97
Junior Member
iTrader: (1)
 
Join Date: Dec 2008
Location: Silicon Valley
Posts: 160
Total Cats: 0
Default

Also, there is a guy in cr.net right now about to finish his fastback hardtop. He is claiming to sell them eventually for 1800. No idea how it will look, or fit.

Back to underbody aero plz...
superslow is offline   Reply With Quote
Old 09-07-2009, 10:59 AM   #98
Senior Member
iTrader: (6)
 
tyson87's Avatar
 
Join Date: Aug 2008
Location: West Palm Beach, FL
Posts: 1,023
Total Cats: 1
Default

tyson87 is offline   Reply With Quote
Old 09-07-2009, 11:04 AM   #99
Miotta FTW!
iTrader: (24)
 
Splitime's Avatar
 
Join Date: Jun 2006
Location: Chicagoland, IL
Posts: 4,293
Total Cats: 26
Default

Sigh, sponsored show vehicles.
Splitime is offline   Reply With Quote
Old 09-07-2009, 11:11 AM   #100
Tour de Franzia
iTrader: (6)
 
hustler's Avatar
 
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,114
Total Cats: 351
Default

I have a sponsor, its my wallet.
hustler is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
15x10 - 15x11 6UL @ 949 Racing emilio700 Wheels and Tires 151 06-02-2017 03:36 PM
OTS Bilstein to motorsports ASN conversion stoves Suspension, Brakes, Drivetrain 5 04-21-2016 04:00 PM
Going back to stock. Need some 1.6 parts. Trent WTB 2 10-01-2015 01:15 PM
Leaky Wilwoods mx592 Suspension, Brakes, Drivetrain 1 10-01-2015 01:45 AM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 03:44 AM.