Nissan Road Racing Forums

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

Reply
 
Thread Tools Display Modes
  #61  
Old 03-25-2010, 08:26 PM
Full-Race Geoff Full-Race Geoff is offline
Member
 
Join Date: Feb 2010
Posts: 89
Default MOTON = omfg

oops
Reply With Quote
  #62  
Old 03-25-2010, 11:49 PM
floodo1 floodo1 is offline
Senior Member
 
Join Date: Apr 2008
Posts: 200
Default

Quote:
Originally Posted by Epstein View Post
Don't forget that where your ride height is set (and the subsequent 0 height) will affect your graph. The overall shape should be the same, though.

As far as the ziptied shorter traction arm theory, I really don't think bumpsteer has anything to do with it. With a short traction arm, the spindle rolls forward a lot quicker than with a longer one. That tells me that anti-squat is being changed. I really doubt the drift guys have bumpsteer issues anyways, considering the fact that they don't have any compliance to begin with. That's one way to solve bumpsteer.... don't have any bump.
anti-squat is determined by the location of the two inner pivots on the lower control arm. the traction arm doesn't change anti-squat.
Reply With Quote
  #63  
Old 03-26-2010, 12:09 AM
Full-Race Geoff Full-Race Geoff is offline
Member
 
Join Date: Feb 2010
Posts: 89
Default

yes, and the angle of the subframe is the easiest way to change the plane that the LCAs rotate on - or you could cut the lca tabs off and relocate like many do to S13 subframes to convert to s14
Reply With Quote
  #64  
Old 03-29-2010, 06:28 PM
racepar1 racepar1 is offline
Senior Member
 
Join Date: Mar 2008
Location: Simi Valley, CA
Posts: 673
Default

Excellent work! I am quite impressed. One thing though...

Did you play with the toe arm lengths at all???

That seems to be the only other thing to adjust without fabrication work.
__________________
function > form
1990 240sx fastback: IN PROGRESS
Reply With Quote
  #65  
Old 03-29-2010, 06:33 PM
Full-Race Geoff Full-Race Geoff is offline
Member
 
Join Date: Feb 2010
Posts: 89
Default

look at his 8.5" / 12.25" plot, it goes real nice from toe in, to 0 to toe in. This amount of toe in gain just means that epstein needs the toe arm shortened (since its behind the hub, it would need to be lengthened if in front of the hub) to get it just right.

->the toe arm is longer than it needs to be, so shorten the toe arm by moving the eccentric to the furthest position
Reply With Quote
  #66  
Old 03-31-2010, 06:23 AM
TSL TSL is offline
Junior Member
 
Join Date: Mar 2010
Location: Adelaide, Australia
Posts: 25
Default

I don't have anything constructive to add, other than to say this is an awesome thread and it is exactly this sort of thing that made me sign up to this forum.

I am just beginning to experiment with alignment settings and the data in this thread has given me an entirely new insight into the whole process.

Keep the data coming!
__________________
Reply With Quote
  #67  
Old 04-05-2010, 02:59 PM
racepar1 racepar1 is offline
Senior Member
 
Join Date: Mar 2008
Location: Simi Valley, CA
Posts: 673
Default

Quote:
Originally Posted by Full-Race Geoff View Post
look at his 8.5" / 12.25" plot, it goes real nice from toe in, to 0 to toe in. This amount of toe in gain just means that epstein needs the toe arm shortened (since its behind the hub, it would need to be lengthened if in front of the hub) to get it just right.

->the toe arm is longer than it needs to be, so shorten the toe arm by moving the eccentric to the furthest position
Thanks for the info! when I build my subframe I am going to weld washers onto it and eliminate the cam bolts altogether. I figure now that the geometry has been kinda figured out there isn't much need for adjustment once you position the mounts to the best of current knowledge.
__________________
function > form
1990 240sx fastback: IN PROGRESS
Reply With Quote
  #68  
Old 04-08-2010, 05:26 PM
Scores240 Scores240 is offline
Senior Member
 
Join Date: Jul 2008
Location: Brodheadsville, PA
Posts: 251
Default

Are these lengths measured from the centers of both bolt holes?
Reply With Quote
  #69  
Old 04-09-2010, 07:04 PM
Epstein Epstein is offline
Senior Member
 
Join Date: Mar 2008
Location: Clearwater, FL
Posts: 617
Send a message via AIM to Epstein
Default

Quote:
Originally Posted by GodspeedS13 View Post
Are these lengths measured from the centers of both bolt holes?
Yes. If they're in the car and the bolts face the same way, its easier to turn the heads to you get 2 parallel flat sides and measure that way. It's a hell of a lot more accurate than eyeballing bolt centers.
__________________
She's built like a Steakhouse, but she handles like a Bistro.
Reply With Quote
  #70  
Old 04-09-2010, 10:15 PM
Scores240 Scores240 is offline
Senior Member
 
Join Date: Jul 2008
Location: Brodheadsville, PA
Posts: 251
Default

Quote:
Originally Posted by Epstein View Post
Yes. If they're in the car and the bolts face the same way, its easier to turn the heads to you get 2 parallel flat sides and measure that way. It's a hell of a lot more accurate than eyeballing bolt centers.
Yea i figured it out when i went outside to adjust everything. Hopefully its set up good enough for an autocross on sunday.
Reply With Quote
Reply

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: kreativfantasy.com
www.nissanroadracing.com