Visit The Dirt Forum for More Information

Author Topic:   dive and roll
340duster
Dirt Maniac

Total posts: 195
posted February 23, 2005 11:55 AM  
I am designing the front suspension geometry for my new car. I have purchased software that allows you to dive and roll the front suspension and see the camber and roll center changes. How much dive and roll should I plan for? I know it varies with springs/track/antidive/G's etc etc. But I need a design point to be in the ballpark. I am thinking 1"-2" of dive and 2-3 degrees roll?

dirtywrench13
Dirt Freak

Total posts: 324
posted February 23, 2005 11:59 AM  
see if you can use the dinensions from your old car as a starting point,then decide from there.you may be right in the ballpark already.

wfoondirt
Dirt Forum Champ
Total posts: 505
posted February 23, 2005 12:07 PM  
quote:
Originally posted by 340duster:
I am thinking 1"-2" of dive and 2-3 degrees roll?

Your in the ballpark. Only other consideration is the amount of banking.


If you haven't already I would recommend reading William Mitchell's white paper on asymetric roll centers. It gives a good approach to front geometry design. Its available from the SAE website.

Link

edited for formating

[This message has been edited by wfoondirt (edited February 23, 2005).]

340duster
Dirt Maniac

Total posts: 195
posted February 23, 2005 02:39 PM  
dirtywrench13 - It would be difficult to actually measure dive and roll without a data aquisition system.

wfoondirt - thanks for the info, my crewchief may have some of the papers from Bill Mitchell, I will check with him.

I have been playing with the software, it is fun, but it is all a series of comprimises. The left front is where things get comprimised the most cause we are trying to maintain a Right front camber curve and a good roll center.


#13 mod
Dirt Full Roller

Total posts: 72
posted February 23, 2005 05:28 PM  
What is the software that you bought, and where did you get it from. That would be a nice thing to have around to play with some ideas before they hit the track.

340duster
Dirt Maniac

Total posts: 195
posted February 26, 2005 10:23 AM  
here's the link, available through motorstate
http://www.racingsoftware.com/

Back to the Archives