Suspension & Brakes Theory, alignment, spring rates....

alignment specs

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Old Aug 9, 2007 | 10:41 AM
  #1  
commguy's Avatar
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Joined: Jul 2007
Posts: 58
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From: North Carolina
Default alignment specs

Anyone running pos caster? or pos rear toe? How much? I am about to throw (almost) every suspension part SPC makes for the EJ8 on my car and I've been thinking out the numbers and I'm thinking about:
0 Front Toe
-1.00 - -1.5 front camber (I Think that might be all I can get out of this control arm)
+2.5 Front caster
-1.00 rear camber
+1.0 - +1.5 rear toe out

Anyone running similar numbers? This is my daily driver not really a track car, but I definitely care a lot about handling!
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Old Aug 9, 2007 | 04:10 PM
  #2  
TunerN00b's Avatar
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Joined: Jun 2004
Posts: 7,539
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From: Sherman Oaks, CA, United States
Default Re: alignment specs (commguy)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by commguy &raquo;</TD></TR><TR><TD CLASS="quote">Anyone running pos caster? or pos rear toe? How much? I am about to throw (almost) every suspension part SPC makes for the EJ8 on my car and I've been thinking out the numbers and I'm thinking about:
0 Front Toe
-1.00 - -1.5 front camber (I Think that might be all I can get out of this control arm)
+2.5 Front caster
-1.00 rear camber
+1.0 - +1.5 rear toe out

Anyone running similar numbers? This is my daily driver not really a track car, but I definitely care a lot about handling!</TD></TR></TABLE>

00 GSR dd/auto-x/HPDE use
toe: 0 front, factory spec rear (slight toe in)
camber: -4.0*/-1.4* f/r (needs significantly more rear camber)
caster: +4.0* (wish I had more)

However, these numbers are useless in the general sense.

Different tires have different camber preferences, as do different cars, so you can't compare apples to oranges. A softer sprung car on OEM rubber bushings at a higher ride height is going to lose more of its static camber under roll. Thusly, it will need relatively more static camber to get to the same dynamic camber of a low, stiffly sprung race car on sphericals. So, there's no simple answer for everyone.

Toe is somewhat of a driver preference. Mine is a daily driver, I want 0 toe for the street, and put up with it at the track.

I'm of the belief that caster is a good thing, though I've heard many others who firmly believe otherwise. You'll have to do your own research here.

And yes, I daily drive with -4.0* of camber. No, my tires do not wear unusually, faster than normal, or in any other way unacceptably. I also rotate monthly when swapping back to street tires after auto-x. However, this isn't the thread to discuss wear, I'm just tossing that out there before anyone else decides to comment on it.
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