ttb

my alignment specs show my SAI is off. does anybody know if the SAI angle is adjustable on the FD?

"SAI is a directional control angle. The point of intersection is designed by manufacturers to provide a pivot point for the front wheels when cornering. SAI is not adjustable on most vehicles. SAI can be affected by loose, worn or damaged suspension parts or by frame damage. "

jr426

A bent spindle would be the only reason for your SAI to be out of spec. BTW spec. are 13.9 degrees for 93, 94 and 14.1 degrees for a 95. Are the angles even side to side? SAI can be affected by an unlevel alignment rack, doing the measurement incorrectly, and uneven camber can cause misreadings, although when camber is included in the measurement it is called "included" and the differance will show (ex. rt camber .7 Lf .3 than included would be rt 14.6 Lt 14.2) BTW it is not adjustable. Jeff

ttb

these are the specs

front left right
camber -1.0 -1.0 deg
caster 6.4 6.4 deg
toe -0.00 0.00 inch
total toe -0.00 inch
set back 0.06 deg
SAI 14.6 10.4 deg
included angle 13.6 9.4 deg

rear
camber -0.7 -0.7 deg
toe 0.03 0.03 inch
total toe 0.05 inch
thrust angle 0.00 deg

the SAI/included angle differ by quite a bit. i'm thinking this may be causing my pull problem.

jr426

Does your car pull to the Rt. If it does I would lower the left side caster first. You want about .5 to .8 split between sides, lower on left, to make it drive straight. It does look like you might have a bad Rt spindle. Jeff

ttb

yup, the car pulls to the right.

thanks for the info

ttb

i told rick of rick's rotary to check my suspension out and he said everything looks fine. a body shop did tell me to adjust my caster to compensate for the crown...

jr426

Does your car drift to the right gradually or pull to the rt like a lane change. If it pulls maybe you have a tire pull, I know you asked about that before so I assume you tried crossing the tires. Even though I read that a tire pull can't originate from the rear I have had a couple cars that would not drive straight until I crossed the rear tires. If it just drifts than adjusting the caster should fix it, must cars need something like .5 to 1 degree split lower on the left side to make them drive straight even on a road that looks flat. If your spindle is bent (4 degrees) than rick's rotory or your alignment shop should have no problem spoting it. I will try to put mine on the alignment rack soon and check my SAI to varify, maybe they are just machined that way, as it would have taken a pretty good hit to bend it that far. BTW, I had a car with SAI that looked alot like yours but still drove straight. I bought the spindles that I used for the suspension from a wrecking yard so I suspect one was bent, but it caused no problems. I really wish I could post a picture Jeff

jr426

Here is the numbers from my car.
front lt rt
camber -.9 -.9
caster 6.4 7.1
toe +.32 degrees
SAI 14.2 10.0
included 13.3 9.1

rear
camber -.6 -.6
toe .20 degrees

reza

my car pulls to the right as soon as I put on Yoko ES 100.
Anyone else experiencing that?
I was told that if the difference between SAI and included the same left and right, it should be good.

Here is my setting:

Front Left Right
Camber -2.2 -2.2
Caster 5.6 5.7
Toe -0.01 -0.01
Total Toe -0.02
Set Back 0.11
SAI 16.1 10.9
Included 13.9 8.7

Rear
Camber -1.5 -1.5
Toe 0.03 0.03
Total Toe 0.06
Thrus Angle 0.00

You can see that left SAI and Included difference is 2.2 (16.1-13.9)
Right SAI and Included difference is 2.2 as well.(10.9-8.7)

This is alignment done by C2 Automotive for Autocross.
Camber was not this much, but he analyze my tires thread and said that I corner faster than before thus I need more camber. I used to have -1.8/1.9 camber.

Hope this help. But as soon as I put on the Yoko ES100, it pulls to the right. I was told to cross rotate the tires to see if its radial pulls or alignment.
But it was fine when I used my old tires.

Reza