Nissan Road Racing Forums

Go Back   Nissan Road Racing Forums > Chassis > 240SX S13/S14/S15

Thread Tools Display Modes
Old 09-27-2012, 10:07 AM
Epstein Epstein is offline
Senior Member
Join Date: Mar 2008
Location: Clearwater, FL
Posts: 617
Send a message via AIM to Epstein

My data was taken with the Maximum Motorsports single dial / hinged setup.

Yeah, the hub/knuckle rolls forward pretty good as you sweep it up through the range. Even more if you're running a short traction arm. I'm wondering what that roll equates to. If you projected a line forward, swept the assembly up and down, and watched where it converged... would this point be... the instant center?
She's built like a Steakhouse, but she handles like a Bistro.
Reply With Quote
Old 09-27-2012, 12:42 PM
Jason M Jason M is offline
Senior Member
Join Date: Jun 2008
Location: Bonney Lake, Wa
Posts: 1,276

I have not plotted the rear spindle fore & aft movement, but I have plotted the spindle roll angle on the s13 subframe. It is right around 3*/inch & very linear. I believe the roll may be accelerated on the s13 subframe due to the higher amount of antisqaut. I would be interested in seeing the spindle roll angle rate on an s14 subframe.

I believe that the higher amounts of antisquat may attribute to higher amounts of "roll steer", or fore & aft movement of the spindle. The roll steer that I'am refering to is the wheel base change during body roll.

Something else that we have not discussed is the setback amount of the toe rods outer pickup point vs the inner pickup point. As the spindle rolls forward under bump, the toe rod pick up points align. This setting/adjustment is similar to moving a steering rack forward or rearwards in a chassis to change the bumpsteer curve. It can be changed with lca's that have inner rod ends, and by modifiying the spindles toe rod pickup point. If the spindle roll rate is different on the s14 subframe, it would produce a different curve if the toe arms pickup point setback was left the same.
Reply With Quote
Old 01-07-2018, 11:23 PM
godrifttoday godrifttoday is offline
Join Date: Sep 2010
Posts: 46

Just messaged Epstein for the excel file anyone happen to have it? thanks!
Reply With Quote

Thread Tools
Display Modes

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

Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
vBulletin Style by: