V8R X-Lite control arms: some assembly required - Page 3 - Miata Turbo Forum - Boost cars, acquire cats.

Suspension, Brakes, Drivetrain discuss the wondrous effects of boost and your miata...
Sponsored by:
Sponsored by:

V8R X-Lite control arms: some assembly required

Old 10-06-2018, 08:30 PM
  #41  
Elite Member
iTrader: (1)
 
Leafy's Avatar
 
Join Date: Jun 2012
Location: NH
Posts: 9,328
Total Cats: 84
Default

Originally Posted by themonkeyman View Post


Why would they deaign an arm that doesn’t use the Miata ball joint? It has ample attachment points and has proven itself pretty robust. Plus it would prevent a situation like this from happening.
Miata lower ball joints are heavy, the expensive OEM ones dont last very long (when driven hard and on bumpy surfaces) and part store ones are often basically dead when new. If they were smart they'd have used the $8 camaro ball joints to are way more robust and fit the stock spindles.
Leafy is offline  
Reply
Leave a poscat -1 Leave a negcat
Old 10-08-2018, 09:35 PM
  #42  
Junior Member
 
Dietcoke's Avatar
 
Join Date: May 2015
Location: Richmond Hill, GA
Posts: 156
Total Cats: -64
Default

More info out of Bob today.

"This is what I found when I took it apart. On the left is the kingpin. On the right is the end of the arm, and the socket. It all looks intact and in good shape"

" The good on on the left, and the failure on the right.
There is a ball inside of a race installed into the machined pocket in the arm.
The king pin fits down through the center of the ball.
That small cap screw holds the gold colored cap in place, and retains the king pin. "


"Failure on the right. The cap screw broke just under the cap, allowed the king pin to come out of the socket.
The entire weight of the car is dependent on that one cap screw.
I tried to get the other cap screw out, but I couldn't. Maybe they were over tightened?"

Last edited by Dietcoke; 10-08-2018 at 09:49 PM.
Dietcoke is offline  
Old 10-08-2018, 10:10 PM
  #43  
afm
Senior Member
Thread Starter
iTrader: (3)
 
Join Date: Nov 2015
Location: Berkeley, CA
Posts: 787
Total Cats: 235
Default

That LBJ uniball adapter is very reminiscent of the “early version” UBJ adapters that I believe TNTUBA broke. For the upper arm at least, that was superseded by a new version with a larger bolt going through both the bearing and the upright using a tapered spacer.

As shown in the first post, fear of similar issues and setup problems led me to DIY my own, more robust UBJ adapters (below). I can’t imagine running that LBJ adapter as pictures; it’s a bummer that it broke on him before he became aware of potential issues :(

Originally Posted by afm View Post
afm is offline  
Old 10-10-2018, 08:45 AM
  #44  
Senior Member
iTrader: (1)
 
TNTUBA's Avatar
 
Join Date: Jan 2011
Location: Chattanooga, Tn
Posts: 1,104
Total Cats: 205
Default

I broke an upper ball joint. I used the lowers for about half a season then got around to measuring the roll centers.....which were actually worse than stock. They made me some longer lower ball joint pins to correct the roll centers, but then the control arm it's self hit the brake disk. I abandoned the front lowers but still use the billet V8R Front uppers and their tubular steel rear uppers and lowers.

I am changing spindles this winter and a few other things. I was thinking about revisiting the front lowers...but I'm not 100% sure now.

Ball joints fail. I've seen stock ones, extended ones, OEM and parts store ball joints fail...that's what they do and why you need to replace them early and often
TNTUBA is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
xcoldricex
Miata parts for sale/trade
3
06-26-2016 10:20 AM
xcoldricex
Miata parts for sale/trade
1
06-17-2016 10:38 AM
saitrix
DIY Turbo Discussion
21
04-27-2009 05:58 PM
paul
Miata parts for sale/trade
2
06-30-2008 10:55 AM
Kelly
Miata parts for sale/trade
11
02-14-2007 03:03 PM


Thread Tools
Search this Thread
Quick Reply: V8R X-Lite control arms: some assembly required


Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2018 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.