DIY Subframe bracing? - Page 2 - 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 12-16-2006, 12:53 PM   #21
Elite Member
iTrader: (5)
 
Atlanta93LE's Avatar
 
Join Date: Sep 2006
Location: Marietta, GA
Posts: 2,198
Total Cats: 1
Default

If you're doing a full ladder frame, differential displacements between corners would work fairly well for design, just remember to keep the design displacement small...very small...or you'll end up with an over-designed frame

Smaller braces, however, would be very difficult with displacements; you've got three translational degrees of freedom, and no information about their motion corresponding to vertical motion at the wheel.

Sidenote: When auto companies do physical chassis tests (when full FEA runs aren't enough), it's really cool. They use laser doppler vibrometers to track the underside of the car while it is sitting on four actuators. Neat stuff, those laser doppler vibrometers.
Atlanta93LE is offline   Reply With Quote
Old 12-16-2006, 01:06 PM   #22
Senior Member
iTrader: (2)
 
Join Date: Feb 2006
Location: Mesa, AZ
Posts: 999
Total Cats: 0
Default

i think my wife has one of those laser dobbler vibrometer 2000s in the night stand next to our bed.... u mean i can use that thing to check the stiffness of my frame too!?!?
adbradley is offline   Reply With Quote
Old 12-16-2006, 01:13 PM   #23
Elite Member
iTrader: (6)
 
Loki047's Avatar
 
Join Date: Sep 2005
Location: Chicago
Posts: 4,145
Total Cats: 0
Default

Yeah the laser vibrometers are fun, were using two of them for a vibrations study to reduce noise in gearbox boxes. Stupidly expensive.
Loki047 is offline   Reply With Quote
Old 12-16-2006, 01:43 PM   #24
Elite Member
iTrader: (5)
 
Atlanta93LE's Avatar
 
Join Date: Sep 2006
Location: Marietta, GA
Posts: 2,198
Total Cats: 1
Default

But stupidly cool, too.
Atlanta93LE is offline   Reply With Quote
Old 12-16-2006, 02:02 PM   #25
Senior Member
iTrader: (2)
 
dc2696's Avatar
 
Join Date: May 2005
Location: Edmonton Ab, Canada
Posts: 1,176
Total Cats: 13
Default

Quote:
Originally Posted by adbradley View Post
i think my wife has one of those laser dobbler vibrometer 2000s in the night stand next to our bed.... u mean i can use that thing to check the stiffness of my frame too!?!?
lol, its an amazing piece of equipment eh? lol

Why not just buy some racing beat chassis braces? They're relatively cheap seems like they work well.
dc2696 is offline   Reply With Quote
Old 12-16-2006, 02:49 PM   #26
I'm Miserable!
iTrader: (5)
 
Join Date: Sep 2005
Location: SLC, Utah
Posts: 1,591
Total Cats: 0
Default

Quote:
Originally Posted by adbradley View Post
i think my wife has one of those laser dobbler vibrometer 2000s in the night stand next to our bed.... u mean i can use that thing to check the stiffness of my frame too!?!?
does it make you jealous....??
zoom2zoom is offline   Reply With Quote
Old 12-16-2006, 04:00 PM   #27
Elite Member
iTrader: (6)
 
Loki047's Avatar
 
Join Date: Sep 2005
Location: Chicago
Posts: 4,145
Total Cats: 0
Default

Quote:
Originally Posted by zoom2zoom View Post
does it make you jealous....??
Who would be jealous?
Loki047 is offline   Reply With Quote
Old 12-16-2006, 06:52 PM   #28
Senior Member
iTrader: (2)
 
Join Date: Feb 2006
Location: Mesa, AZ
Posts: 999
Total Cats: 0
Default

hahahah na, she uses that, gives me more time to work on my car!
adbradley is offline   Reply With Quote
Old 12-16-2006, 10:16 PM   #29
Junior Member
Thread Starter
 
Sirnixalot's Avatar
 
Join Date: Aug 2005
Location: Cayman Islands
Posts: 440
Total Cats: 17
Default

Quote:
Originally Posted by dc2696 View Post
lol, its an amazing piece of equipment eh? lol

Why not just buy some racing beat chassis braces? They're relatively cheap seems like they work well.
shipping for one....getting stuff here isnt hard just a little pricey.

HA....i found a pic of the autoexe one....im quite certain mine wont look that fancy but function over form

Sirnixalot is offline   Reply With Quote
Old 12-17-2006, 12:12 AM   #30
Elite Member
iTrader: (13)
 
cjernigan's Avatar
 
Join Date: Oct 2006
Location: Atlanta, GA
Posts: 8,147
Total Cats: 6
Default

Man that's sick. You could reproduce that almost exactly using rubing is you were so inclined. I might have to take advanced welding just so I have a designated class period to build my new mani/dp and some braces like those.
Makes me drool just thinking about it.
cjernigan is offline   Reply With Quote
Old 12-17-2006, 12:10 PM   #31
Elite Member
iTrader: (5)
 
m2cupcar's Avatar
 
Join Date: Jan 2005
Location: Atlanta
Posts: 7,240
Total Cats: 290
Default

there's no way in hell those braces WON'T make a big difference. They've essentially closed up the entire "open" area on the underside of the car. Too cool.
m2cupcar is offline   Reply With Quote
Old 12-17-2006, 02:49 PM   #32
Senior Member
iTrader: (2)
 
dc2696's Avatar
 
Join Date: May 2005
Location: Edmonton Ab, Canada
Posts: 1,176
Total Cats: 13
Default

Quote:
Originally Posted by Sirnixalot View Post
shipping for one....getting stuff here isnt hard just a little pricey.

HA....i found a pic of the autoexe one....im quite certain mine wont look that fancy but function over form


Oh **** that is SICK!

btw where in the world are ya? I know shipping up here kills too but sometimes u gotta bite the bullet.
dc2696 is offline   Reply With Quote
Old 12-17-2006, 02:55 PM   #33
Junior Member
Thread Starter
 
Sirnixalot's Avatar
 
Join Date: Aug 2005
Location: Cayman Islands
Posts: 440
Total Cats: 17
Default

the car is in the cayman islands...im kinda inbetween there and england (university).

i want to do a diy version of the autoexe stuff, ijust need to get the car running on the TEC so i can leave it with my friend to put it on a lift and get that **** done as he has the time.
Sirnixalot is offline   Reply With Quote
Old 12-17-2006, 03:38 PM   #34
Elite Member
iTrader: (5)
 
Atlanta93LE's Avatar
 
Join Date: Sep 2006
Location: Marietta, GA
Posts: 2,198
Total Cats: 1
Default

If I were you, I'd make a hybrid of that example and the FM butterfly. From that pictures, it looks like it ties into the floor. I'd attach to the "frame rails" as well.
Atlanta93LE is offline   Reply With Quote
Old 12-21-2006, 02:13 AM   #35
Elite Member
iTrader: (1)
 
Join Date: Jun 2005
Location: Charleston, SC
Posts: 2,980
Total Cats: 14
Default

Here's a page off the old SebringMiata.com (I keep a mirror of it on my server):

http://ww2.lightweightmiata.com:8080...ans/page3.html

(BTW, John's car is the one that got me started on my Red Beast project)
rmcelwee is offline   Reply With Quote
Old 12-21-2006, 05:49 PM   #36
Tour de Franzia
iTrader: (6)
 
hustler's Avatar
 
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,114
Total Cats: 351
Default

Quote:
Originally Posted by Sirnixalot View Post
shipping for one....getting stuff here isnt hard just a little pricey.

HA....i found a pic of the autoexe one....im quite certain mine wont look that fancy but function over form

[img]http://adrenalineracing.com/images/NB1.jpg[img]

If you can put one together, I'll buy it.
hustler is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
LucaCarMods's Boosted Dutch Miata Build! LucaCarMods Build Threads 11 02-14-2016 07:13 AM
My solution for Oiltemp and Oilpressure input into Megasuirt (MS3) Zaphod MEGAsquirt 41 01-24-2016 01:25 PM
In need of base map for stock 1997 brandonbkd MEGAsquirt 0 09-29-2015 12:52 AM
Suspension difference(s) between NA and NB d k Race Prep 11 09-09-2015 06:12 PM


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 02:44 AM.