Race Car Tech Discuss anything related to road racing and auto X.

Quick alignment question

Old 05-21-13, 02:38 PM
  #1  
Living on the North Coast

Thread Starter
iTrader: (31)
 
DeaconBlue's Avatar
 
Join Date: Mar 2009
Location: Avon Lake
Posts: 600
Received 7 Likes on 7 Posts
Quick alignment question

In the front of my S5, on the street I normally run zero toe with about -1.5 camber. When I head to the track I would like to dial in a bit more negative camber, say -2.5 degrees to allow the Nitto NT01 track rubber to work better and possibly help to even out any issues with temps across the tread. Any idea on what the effect is on the toe setting when I add the additional negative camber to the front? The ride height is close to stock, maybe 1/4" lower. TIA.
Old 05-22-13, 08:27 PM
  #2  
Searching for 10th's

iTrader: (11)
 
jkstill's Avatar
 
Join Date: May 2002
Location: Portland OR
Posts: 2,247
Received 29 Likes on 18 Posts
On an FD the camber adjustment is on the lower control arm - adding negative camber increases toe in.

On the FC the camber adjustment is the top of the strut - that should not have as much affect on toe.

Hopefully for you an FC expert will chime in.
Old 05-24-13, 03:36 PM
  #3  
Becoming pure track...

iTrader: (1)
 
Rx7TyreBurna's Avatar
 
Join Date: Feb 2005
Location: Olympia, WA
Posts: 1,069
Likes: 0
Received 0 Likes on 0 Posts
DeaconBlue,
How are you measuring your camber / toe?
Old 05-24-13, 09:19 PM
  #4  
My job is to blow **** up

iTrader: (8)
 
lastphaseofthis's Avatar
 
Join Date: Jan 2005
Location: palmyra Indiana
Posts: 2,900
Received 3 Likes on 3 Posts
Originally Posted by jkstill
On an FD the camber adjustment is on the lower control arm - adding negative camber increases toe in.

On the FC the camber adjustment is the top of the strut - that should not have as much affect on toe.

Hopefully for you an FC expert will chime in.
unless you slot the bolt holes the fc has no camber adjustment. you can also slot the struts' mounting bolts at the bottom., and this increases toe in on the fc as well.
Old 05-24-13, 10:11 PM
  #5  
Living on the North Coast

Thread Starter
iTrader: (31)
 
DeaconBlue's Avatar
 
Join Date: Mar 2009
Location: Avon Lake
Posts: 600
Received 7 Likes on 7 Posts
I have a set of Stance GR+Pro coil overs on the car . They came with adjustable camber upper front mounts. I had the shop dial in the street alignment with -1.5 degree camber with 0.02" toe in and 5 degrees caster. The rears are -1.7 degree camber and 0.06" toe in. I may dial some more of that out with the adjustable vertical link that I have already installed. I was hoping for zero toe both front and rear, but the total trust angle is 0.01 degree. On flat and level pavement she goes dead straight, but she follows the crown on the road otherwise.

I have a nice flat piece of pavement and a Craftsman digital level gauge to double check the camber settings.

On the track I was hoping to bump the front camber to -2.5 degree, which is the minimum recommended for the Nitto NT01 tires. I was just hoping not to induce too much toe change with the added negative camber. I need to double check the tire/rim clearance to the spring/strut and make sure there is enough clearance for the addition negative camber. I am also running close to stock ride height - well at least not as much drop in the front as I had with the Eibach springs.
Old 05-25-13, 10:50 AM
  #6  
Moderator

iTrader: (3)
 
j9fd3s's Avatar
 
Join Date: Mar 2001
Location: https://www2.mazda.com/en/100th/
Posts: 30,778
Received 2,563 Likes on 1,823 Posts
going two decimal places with the toe is more than close enough .006 is effectively zero.

i know the toe doesn't change much with camber, you're probably ok, but maybe you want to buy/make a pair of toe plates?
Old 05-28-13, 11:52 PM
  #7  
1308ccs of awesome

iTrader: (9)
 
eage8's Avatar
 
Join Date: Sep 2003
Location: Woodbine, MD
Posts: 6,189
Received 17 Likes on 15 Posts
you can figure it out decently easily by comparing the ratio between the ball joint to the camber plate and the ball joint to the tie rod.

so if you figure the difference between the strut top to ball joint is 20" long and the difference between the ball joint and tie rod is like 2"? (I'm just making up these numbers) If you move the camber plates 1" the toe changes .1" toe out per side at the tie rod... at the tire where it's more likely measured (or even further out than that for toe plates) it's at least double that or maybe triple that....

so you're now talking about possibly a half inch combined toe out... I'd invest in some toe plates, they're nice to have
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
_Tones_
Adaptronic Engine Mgmt - AUS
10
05-25-21 05:37 AM
SakeBomb Garage
SakeBomb Garage
9
05-11-20 10:04 AM
Jeff20B
1st Generation Specific (1979-1985)
73
09-16-18 07:16 PM
SakeBomb Garage
Group Buy & Product Dev. FD RX-7
8
10-09-15 10:05 PM


Thread Tools
Search this Thread
Quick Reply: Quick alignment question



All times are GMT -5. The time now is 09:33 PM.