LocostUSA.com

Learning how to build Lotus Seven replicas...together!
It is currently March 29, 2024, 3:45 am

All times are UTC - 5 hours [ DST ]




Post new topic Reply to topic  [ 6 posts ] 
Author Message
PostPosted: November 2, 2015, 7:38 pm 
Offline

Joined: August 18, 2015, 12:41 pm
Posts: 118
Location: Seattle area (Woodinville)
Has anyone used the either the Champion or Gibbs book control arm pivot positions with Miata spindles on a completed car? How is it working out?

I've just received my shiny new Performance Trends roll center calculator ($69.99 plus shipping from Coleman racing, a little cheaper downloaded from Performance Trends), but this seems like good information to have before I start reinventing the geometry.

_________________
Jerry Henneman

Jack of many trades
Master of unfinished projects
build blog/log at https://jerryslocost.wordpress.com


Top
 Profile  
Reply with quote  
PostPosted: November 3, 2015, 2:23 pm 
Offline
The voice of reason
User avatar

Joined: January 10, 2008, 4:47 pm
Posts: 7652
Location: Massachusetts
There is good info on this site, but not really phrased like what you are asking. The answer depends mostly on the difference in height between the upper and lower ball joints on the spindles. At a minimum you need to take that into account.

This may be a reasonable thing to put into a "Lessons Learned - Front Suspension" thread. It can have an item that points to threads that describe use of the Miata front spindle.

Some of us here use a web site called Vsusp for our basic suspension stuff. It is probably less detailed than what you bought, but it is free and your information gets stored in your URL link. That means that when you post the link here anyone can visit the link and get your number for the suspension and look at it. You can get the dimensions of the upright and the frame mounting points.

Here is a link that Joshua Briggs just posted for his front suspension. He is using Pinto front parts because he found a good deal on a complete setup - calipers, rotors, hubs and spindles for under $400. I know there are Vsusp links for folks that used Miata, we just need to track some down for you.

Briggs early front

_________________
Marcus Barrow - Car9 an open design community supported sports car for home builders!
SketchUp collection for LocostUSA: "Dream it, Build it, Drive it!"
Car9 Roadster information - models, drawings, resources etc.


Top
 Profile  
Reply with quote  
PostPosted: November 4, 2015, 11:38 am 
Offline

Joined: August 18, 2015, 12:41 pm
Posts: 118
Location: Seattle area (Woodinville)
Thanks. Somehow I had missed references to VSusp.com

_________________
Jerry Henneman

Jack of many trades
Master of unfinished projects
build blog/log at https://jerryslocost.wordpress.com


Top
 Profile  
Reply with quote  
PostPosted: November 4, 2015, 2:42 pm 
Offline
User avatar

Joined: May 2, 2009, 1:03 pm
Posts: 1389
Location: The Humid State of North Carolina
JerryH wrote:
Thanks. Somehow I had missed references to VSusp.com
There's also one on Racing Aspirations that includes steering rack. It's a bit more complex (as I'm finding) but it is another option.

Good luck!

K "overwhelmed" S

_________________
Check out Firearm Finishes & Coating for options to ceramic coat your Locost parts. Hundreds of stock or custom colors including Chrome and Clear Coating options now available! High Temp options for hot bits!! Plastics too!!

Never become a pessimist. A pessimist is correct oftener than an optimist, but an optimist has more fun, and neither can stop the march of events.-Robert A. Heinlein


Top
 Profile  
Reply with quote  
PostPosted: November 6, 2015, 4:50 pm 
Offline

Joined: August 18, 2015, 12:41 pm
Posts: 118
Location: Seattle area (Woodinville)
botbasher wrote:
JerryH wrote:
Thanks. Somehow I had missed references to VSusp.com
There's also one on Racing Aspirations that includes steering rack. It's a bit more complex (as I'm finding) but it is another option.

Good luck!

K "overwhelmed" S


Thanks. I just took a look at the web page. No promises but I might using all three. If I do I'll post the results.

_________________
Jerry Henneman

Jack of many trades
Master of unfinished projects
build blog/log at https://jerryslocost.wordpress.com


Top
 Profile  
Reply with quote  
PostPosted: November 19, 2015, 5:48 pm 
Offline

Joined: August 18, 2015, 12:41 pm
Posts: 118
Location: Seattle area (Woodinville)
Running the Performance Trends Roll Center calculator with the following inputs produced the results shown further below

Champion "Book" front suspension pivot points.
58" track
1994 Miata spindles
195/50 ZR 16 tire
40mm positive wheel offset
5 1/2" height from ground level to bottom of chassis

Static Roll center: 2" above ground, on chassis centerline
Two degree roll, as in a turn: roll center height 2", one half inch right of centerline
Four degree roll, as if in a hard turn: roll center height 2", 1.1" right of centerline
Two degree roll and one inch dive, as if braking in a turn: roll center height one inch, 1.4" right of centerline
Four degree roll and two inch dive, as if braking hard in a turn: -0.2" roll center height, 50.2" right of centerline.

_________________
Jerry Henneman

Jack of many trades
Master of unfinished projects
build blog/log at https://jerryslocost.wordpress.com


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 6 posts ] 

All times are UTC - 5 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 6 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
POWERED_BY