follow ft86club on our blog, twitter or facebook.
FT86CLUB
Ft86Club
Speed By Design
Register Garage Members List Calendar Search Today's Posts Mark Forums Read

Go Back   Toyota GR86, 86, FR-S and Subaru BRZ Forum - FT86CLUB > Technical Topics > Suspension | Chassis | Brakes -- Sponsored by 949 Racing

Suspension | Chassis | Brakes -- Sponsored by 949 Racing Relating to suspension, chassis, and brakes. Sponsored by 949 Racing.


User Tag List

Reply
 
Thread Tools Search this Thread
Old 11-18-2018, 04:31 PM   #323
DIY
Senior Member
 
DIY's Avatar
 
Join Date: Jul 2016
Drives: BRZ, WRX
Location: Sydney, Australia
Posts: 190
Thanks: 66
Thanked 297 Times in 131 Posts
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
These are the only measurements I have found of the RX8 suspension at this stage, they give an idea but not very accurate.

https://photos.google.com/share/AF1Q...cxMURkaTc0MG5B


.
__________________
Follow me on Instagram: @brzdiy

My Build Thread
DIY is offline   Reply With Quote
Old 11-29-2018, 05:53 AM   #324
DIY
Senior Member
 
DIY's Avatar
 
Join Date: Jul 2016
Drives: BRZ, WRX
Location: Sydney, Australia
Posts: 190
Thanks: 66
Thanked 297 Times in 131 Posts
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
I purchased a pair of RX8 front uprights tonight, I was planning to buy the whole front end but I could not find one for the money I was willing to spend.

While I was there the guy was nice enough to let me take some measurements of the RX8 control arms. As it turns out if you compare the distance of the lower control arm inner pivot across to the face the wheel bolts to for the BRZ and the RX8, the RX8 is actually only about 19mm longer.

Anyway I am pushing ahead with my conversion from mac strut to double wishbone. I won't hijack this thread any longer so if you want to follow the progress then keep an eye my build thread for updates.
__________________
Follow me on Instagram: @brzdiy

My Build Thread

Last edited by DIY; 11-30-2018 at 02:46 AM. Reason: more precise measurement
DIY is offline   Reply With Quote
The Following User Says Thank You to DIY For This Useful Post:
DustinS (02-26-2019)
Old 01-21-2020, 07:09 AM   #325
DIY
Senior Member
 
DIY's Avatar
 
Join Date: Jul 2016
Drives: BRZ, WRX
Location: Sydney, Australia
Posts: 190
Thanks: 66
Thanked 297 Times in 131 Posts
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
The RX8 uprights are now mounted on my BRZ, for the most part the double wishbone conversion is complete. I have extended my wheelbase by 35mm mostly so that the steering rack will clear the crank pulley since the rack is now in front of my Honda K24 engine.

__________________
Follow me on Instagram: @brzdiy

My Build Thread
DIY is offline   Reply With Quote
The Following 2 Users Say Thank You to DIY For This Useful Post:
new2subaru (01-21-2020), solidONE (01-24-2020)
Old 01-24-2020, 04:38 PM   #326
solidONE
Senior Member
 
solidONE's Avatar
 
Join Date: Dec 2012
Drives: FR-S Whiteout
Location: California
Posts: 2,745
Thanks: 1,685
Thanked 748 Times in 581 Posts
Mentioned: 40 Post(s)
Tagged: 0 Thread(s)
Quote:
Originally Posted by DIY View Post

Wow.. Beefy control arms much? looks like roll case size tubing. 1 1/4 at least.
__________________
Intent > Content

cowardice is the mother of cruelty.
solidONE is offline   Reply With Quote
Old 01-24-2020, 08:26 PM   #327
DIY
Senior Member
 
DIY's Avatar
 
Join Date: Jul 2016
Drives: BRZ, WRX
Location: Sydney, Australia
Posts: 190
Thanks: 66
Thanked 297 Times in 131 Posts
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quote:
Originally Posted by solidONE View Post
Wow.. Beefy control arms much? looks like roll case size tubing. 1 1/4 at least.
Yes it is 1.25"

Most roll cage is 1.5" with a 1.75" main hoop.

The shock must mount directly to the lower control arm so strength is needed. You could use a smaller tube with chromoly but I prefer to work with mild steel.
__________________
Follow me on Instagram: @brzdiy

My Build Thread
DIY is offline   Reply With Quote
The Following User Says Thank You to DIY For This Useful Post:
solidONE (01-30-2020)
Old 01-30-2020, 04:21 PM   #328
solidONE
Senior Member
 
solidONE's Avatar
 
Join Date: Dec 2012
Drives: FR-S Whiteout
Location: California
Posts: 2,745
Thanks: 1,685
Thanked 748 Times in 581 Posts
Mentioned: 40 Post(s)
Tagged: 0 Thread(s)
Quote:
Originally Posted by DIY View Post
Yes it is 1.25"

Most roll cage is 1.5" with a 1.75" main hoop.

The shock must mount directly to the lower control arm so strength is needed. You could use a smaller tube with chromoly but I prefer to work with mild steel.
Why the preference over chromoly? Cost? Material characteristics? Keep the progress coming!
__________________
Intent > Content

cowardice is the mother of cruelty.
solidONE is offline   Reply With Quote
Old 02-02-2020, 02:56 AM   #329
DIY
Senior Member
 
DIY's Avatar
 
Join Date: Jul 2016
Drives: BRZ, WRX
Location: Sydney, Australia
Posts: 190
Thanks: 66
Thanked 297 Times in 131 Posts
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quote:
Originally Posted by solidONE View Post
Why the preference over chromoly? Cost? Material characteristics? Keep the progress coming!
Mostly the material characteristics, my day job is as a material scientist so I have a pretty good understanding of this. I am not a professional welder, if you follow my build thread you would see I only began welding about 6 months before starting the project, all self taught, reading, youtube tutorials etc. Chromoly weighs the same as mild steel but it is stronger so you can use smaller tube, thinner wall to save weight. The downside is you must weld it following strict guidelines, your welding technique must be on point or you can end up with brittle welds. Mild steel is much more forgiving to weld so I see less risk in using it and I take the weight penalty.
__________________
Follow me on Instagram: @brzdiy

My Build Thread
DIY is offline   Reply With Quote
The Following User Says Thank You to DIY For This Useful Post:
solidONE (02-05-2020)
Old 02-05-2020, 05:34 PM   #330
solidONE
Senior Member
 
solidONE's Avatar
 
Join Date: Dec 2012
Drives: FR-S Whiteout
Location: California
Posts: 2,745
Thanks: 1,685
Thanked 748 Times in 581 Posts
Mentioned: 40 Post(s)
Tagged: 0 Thread(s)
Quote:
Originally Posted by DIY View Post
Mostly the material characteristics, my day job is as a material scientist so I have a pretty good understanding of this. I am not a professional welder, if you follow my build thread you would see I only began welding about 6 months before starting the project, all self taught, reading, youtube tutorials etc. Chromoly weighs the same as mild steel but it is stronger so you can use smaller tube, thinner wall to save weight. The downside is you must weld it following strict guidelines, your welding technique must be on point or you can end up with brittle welds. Mild steel is much more forgiving to weld so I see less risk in using it and I take the weight penalty.
You taught yourself to weld to do this project.. I'm impressed. I'm a bit of a welding hobbyist myself. Takes a lot of balls start chopping up a car and welding it together without prior experience. Appreciate you're sharing your handiwork.

__________________
Intent > Content

cowardice is the mother of cruelty.
solidONE is offline   Reply With Quote
The Following User Says Thank You to solidONE For This Useful Post:
DIY (02-06-2020)
Old 06-08-2020, 07:01 PM   #331
tintumz22
Senior Member
 
tintumz22's Avatar
 
Join Date: May 2012
Drives: 2013 Scion FR-S Toyota 86
Location: Bay Area
Posts: 1,060
Thanks: 1,180
Thanked 281 Times in 187 Posts
Mentioned: 12 Post(s)
Tagged: 0 Thread(s)
I have no background in engineering or physics or any kind. I can do basic math and Iím just trying to learn to get the proper coilovers setup by having numbers guide/help me. Natural frequency, motion ration and such. Just reading through the whole thread and all intrigues me and that is why iím posting. Not trying to derail the thread or cause any trouble. If I offend anybody, I am sorry and i can delete this post right away, just let me know.

I came across this website but they are using a different car and trying to plug in numbers that is already posted in this site. Thank you so much and you guys are awesome! Not really sure if I can use the formula that the guy had in there but i donít have the numbers like axle weight and wheel weight. Could this be applicable in our car?

https://drivetribe.com/p/lets-talk-s...TuOW5CN4C8x7JA
tintumz22 is offline   Reply With Quote
Old 06-09-2020, 09:28 AM   #332
Racecomp Engineering
 
Join Date: Nov 2011
Drives: 2016 BRZ, 2012 Paris Di2 & 2018 STI
Location: Severn, MD
Posts: 4,595
Thanks: 2,482
Thanked 5,683 Times in 2,408 Posts
Mentioned: 261 Post(s)
Tagged: 9 Thread(s)
Send a message via AIM to Racecomp Engineering
Quote:
Originally Posted by tintumz22 View Post
I have no background in engineering or physics or any kind. I can do basic math and Iím just trying to learn to get the proper coilovers setup by having numbers guide/help me. Natural frequency, motion ration and such. Just reading through the whole thread and all intrigues me and that is why iím posting. Not trying to derail the thread or cause any trouble. If I offend anybody, I am sorry and i can delete this post right away, just let me know.

I came across this website but they are using a different car and trying to plug in numbers that is already posted in this site. Thank you so much and you guys are awesome! Not really sure if I can use the formula that the guy had in there but i donít have the numbers like axle weight and wheel weight. Could this be applicable in our car?

https://drivetribe.com/p/lets-talk-s...TuOW5CN4C8x7JA
That approach (choosing suspension frequencies first) is a good first step in setting up a car. It's just a first step and there's much more to think about. That analysis did not mention swaybars for example, which can contribute a significant amount to roll resistance.

There are a lot of "rules of thumb" but none of them are perfect! Decent starting points though.

- Andrew
__________________
Racecomp Engineering is offline   Reply With Quote
The Following User Says Thank You to Racecomp Engineering For This Useful Post:
tintumz22 (06-09-2020)
Old 06-09-2020, 11:54 AM   #333
tintumz22
Senior Member
 
tintumz22's Avatar
 
Join Date: May 2012
Drives: 2013 Scion FR-S Toyota 86
Location: Bay Area
Posts: 1,060
Thanks: 1,180
Thanked 281 Times in 187 Posts
Mentioned: 12 Post(s)
Tagged: 0 Thread(s)
It is giving me numbers that I'm like "wait I don't want those frequencies in my setup" but I don't have all the numbers needed and like you said there is more factors that is in the equation. Thank you though for your input. I appreciate it!
tintumz22 is offline   Reply With Quote
Old 06-09-2020, 12:29 PM   #334
Racecomp Engineering
 
Join Date: Nov 2011
Drives: 2016 BRZ, 2012 Paris Di2 & 2018 STI
Location: Severn, MD
Posts: 4,595
Thanks: 2,482
Thanked 5,683 Times in 2,408 Posts
Mentioned: 261 Post(s)
Tagged: 9 Thread(s)
Send a message via AIM to Racecomp Engineering
Quote:
Originally Posted by tintumz22 View Post
It is giving me numbers that I'm like "wait I don't want those frequencies in my setup" but I don't have all the numbers needed and like you said there is more factors that is in the equation. Thank you though for your input. I appreciate it!
The best suspension frequencies are the ones that help you get around a track the fastest.

Many top level suspension engineers are not that concerned with some of the usual flat ride suspension frequency "rules of thumb".

- Andrew
__________________
Racecomp Engineering is offline   Reply With Quote
The Following 2 Users Say Thank You to Racecomp Engineering For This Useful Post:
Goingnowherefast (06-09-2020), tintumz22 (06-09-2020)
 
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
New Rumor: Subaru Developing Turbo 4 2.0T for BRZ Hachiroku Subaru BRZ General Forum 350 02-02-2013 01:52 PM
Need opinions on two new items we're developing! yospeed Cosmetic Modification (Interior/Exterior/Lighting) 56 12-03-2012 02:13 AM
Chances of Someone Developing 5x114.3 HUBS (not spacers)? Entropy Wheels | Tires | Spacers | Hub -- Sponsored by The Tire Rack 9 08-04-2012 03:35 PM
Hi-res pics & list of BRZ JDM model grades from stripped down base model to STI(?) switchlanez Subaru BRZ General Forum 68 02-14-2012 07:16 AM


All times are GMT -4. The time now is 12:43 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
User Alert System provided by Advanced User Tagging v3.3.0 (Lite) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.

Garage vBulletin Plugins by Drive Thru Online, Inc.