So, what are the Turbo! alignment specs anyhow?
 
Wheel Alignment Theory:
 
Theory reprinted from Grassroots Motorsports magazine



And, the opinions of those on Turbo! (at least, those I saved in my Inbox)
 
From: Damien Shulock 
Tuesday, December 22, 1998 12:43 PM
Turbo! alignment, 

Take 1: 205/60-15" Goodyear Eagle GT+4 (SPG 5.5"x15" wheels) and stock 1986 suspension w/ Group 6 springs. 
 
Camber  LF -.7°  RF  -.8°    LR -.6°   RR  -.7° 
Caster  LF 1.9°  RF  2.1° 
Toe     LF .05"  RF  .05"    LR .10" RR .08" 
   Cross Caster  Front -.2° 
   Total Toe     Front .10"  Rear  .18" 

Take 2: 205/50-15" Pirelli PZeros (SPG 5.5"x15" wheels) and stock 1986 suspension w/ G6 springs. 
 
Camber  LF -.9°  RF  -1.0"   LR -.6°  RR  -.6° 
Caster  LF 2.7°  RF  2.5° 
Toe     LF .05"  RF  .05"    LR .06"  RR .10" 
   Cross Caster  Front .2° 
   Total Toe     Front .10"  Rear  .16"  

Take 3: 205/50-16" Falken GRbetas (Aero 6.5"x16" wheels) with 1988 suspension, including front hub/brake assemblies, and entire rear axle, same G6 springs. 
 
Camber  LF -1.2°  RF  -1.2"   LR -.5°  RR  -.4° 
Caster  LF 2.0°   RF  2.4° 
Toe     LF .03"   RF  .03"    LR .11" RR .12" 
   Cross Caster   Front -.4° 
   Total Toe      Front .06"  Rear  .23" 
 
Observations: 
I wasn't really impressed with 1, but that may be due to the weak tires that were on it at the time.  The lack of traction caused a lot of skittishness that the alignment could not remedy. 
2 was the best driving of the three, with best on-center road feel and intuitive turn-in.  When other people first drove the car they were constantly cutting corners and overshooting lane changes, because the car reacted *now* to steering input.  Highway stability and tracking was very good.  Once again, tires make a big difference and certainly the PZeros contributed to the great handling. 
3 is my current set up, and it has all the great handling of 2, but somewhere along the way I lost the great on-center tracking.  There is some wandering with ruts, concrete joints, cross winds, etc. and it requires your attention to keep it in line.  I Don't know what influence the GRbetas are having, although I am very impressed with cornering grip and braking performance.
From Chip Lamb 
Friday, December 18, 1998 7:06 PM
Excessive negative camber wears tyres incorrectly, and too much caster is fine for highway speeds but around town will wear suspension joints.  Leave the toe at zero. With that kind of negative camber setup, the car is touchy enough.
From:  James Fox 
Friday, December 18, 1998 1:08 AM
1 degree negative camber 
2.75 degrees castor 
just a pinch of toe-in
From: Chip Lamb 
Friday, December 18, 1998 12:56 AM
.5 - 1.0 negative camber 
2.0 - 2.5 positive caster 
ZERO toe 
From: Shulock, Damien 
Tuesday, June 16, 1998 11:04 AM
Camber  -0.9 -1.0 
Caster  +2.7 +2.5 
Toe In  .05" .05"
From: Rodger B Carter 
Thursday, May 07, 1998 11:19 AM
What a difference!  It feels like a totally different car!  It is hard to describe - but something about the way it tracks and how it returns to center is much better. 

Anyways, here is what I gave the alignment guy: 

SAAB 900 Euro Spec Alignment 
Camber     - 0.6 to - 0.7 degrees 

Caster  + 2.5 to + 2.7 degrees 

Toe-in   "just a touch"  - the smallest amount possible measured to Zero

From: Larry West 
Sent: Tuesday, February 17, 1998 1:33 PM 
 
 
 
Wear on the outside edges of the front tires is normal for a Classic Saab 900 with stock alignment driven in any sort of 'spirited' fashion. The stock camber is + 0.5 degrees - that's top of tires leaning OUT. 

Many of us here (myself included) use  - 0.5 degrees of camber (tops of tires leaning IN) as a starting point for future alignments. This helps to keep the inside of the tires on the road in turns. It also helps the car track in turns.

From: Ywan Mason 
Friday, December 05, 1997 11:19 PM
Road crown is usually off set by giving 1/2 degree difference in caster readings, giving the highest positive caster to the low side of the road (depending which side you drive on) but this is not done in race alignments.  Ever seen a crowned track? The front end alignment man at one of the dealers I worked for always set Saabs with very little toe in, this helped with their tendency of wearing edges off tires.
From: Larry West 
Friday, May 02, 1997 9:44 AM
Camber: 0.5 degrees *negative* 
Caster: 2.75 degrees positive 
Toe: 0 (zero, noll, nada, zip)
 

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