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Old 09-25-2006, 09:01 PM   #1 (permalink)
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Join Date: Jan 2002
Location: El Dorado, CA
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All,

Here's a close to final version of the SAI mod instructions. A big thanks to Richard Oben for writing them up for us. Ive gone though them a few times and I think we are pretty close.

If you have any suggestions clarifications or edits, please post here.


Thanks for purchasing the FFR Front Suspension Optimization Kit commonly referred to the SAI Kit. The kit optimizes the front suspension geometry for better performance and steering feel on both track and street. It does this by bringing specific geometries inline with know standards.

Lowers the SAI(Steering Axis Inclination) from 18+ degrees, to approximately 9 degrees. This will reduce camber loss during turn-in increasing front-end grip and reducing the need for negative static camber. In addition, it will have a positive effect on steering feel.

Lowers the Roll Center from approx 5 to approximately 3.5 to better match the 3 Link and IRS rear suspension options. This will increase front end grip and reduce jacking.

Brings Caster Trail inline with standard one piece SLA spindles increasing steering linearity and reduce steering twitchiness at freeway speeds.

Installation instructions.

1 Place vehicle on jack stands securely, do not attempt this installation on a jack or a poorly supported vehicle. Some of the installation requires high torque values and could cause the vehicle to fall.

2 Remove new parts from packaging and verify the parts are correct. The most important are the two upper control arm relocation mounts (UCARM) and the SIA adapters. The parts are different side to side and should be mirror images of each other. In short 2 each brackets and SIA adaptors, 2 short and 2 long 5/8ths bolt, 2 5/8ths lock nuts, 4 each inch short and long bolts, 4 lock nuts. Assorted washers.

3 Remove the front wheels and store under the vehicle.

4 Remove the cotter pins from the upper ball joint and remove the nut. A 7/8ths thin wall socket should be the right size.

5 While prying up on the upper control arm with a pry bar hit the old IFS bracket several times with a hammer. This should save the boot and separate the ball joint from the IFS bracket. Do not hit the stud on the ball joint; all that will do is damage the ball joint stud. If the parts will not separate use a ball joint separator and as a last resort use a pickle fork (this will ruin the boot).

6 Tie a rag around the ball joint to keep the boot on the ball joint and to keep the grease off of everything else.

7 Take care to not stretch/ruin the brake hoses. If the spindle is falling away from the car and putting stress on the hose remove the caliper and hang it with a zip tie, bungee cord or wire.

8 Remove the two bolts holding the upper control arm to the frame. inch wrench and socket will remove them. These will be tight and will take a little force to undo.

9 The control arm is now loose and can be left resting on the lower control arm or shock/spring.

10 The upper control arm relocation mounts (UCARM) are different. There are two even holes and two offset holes. The offset holes go outboard and the even holes go onto (from above) the old upper control arm mounts. The offset hole lowers the front of the upper control compared to the factory location. The outboard rear holes are very close to the frame. Mock up the mounts with the bolts. Short bolts in from the top and long from inboard to outboard. Mark the frame so it can be notched to clear the bolt. An alternative is to remove a small (very small) edge of the rear mounting bolt so it will clear the frame.

11 All of the bolts need to be installed in the UCARM including the control arm or it will not clear the shock/spring. Start with the outer bolts and mount the control arm to the UCARM and then the UCARM to the frame. (The third hand you keep in the toolbox will come in handy for this step.) Again, the shorter bolts go in from the top and the longer control arm bolts go from the inside of the car outboard to hold the control arm. Washers can be used as needed. Remember the front hole of the UCAM should be the lower of the two holes in relation to each other. Note: The front of the control arm is still higher than the rear.

12 In order to get the maximum range of motion, it may be best to flip your upper control arm over so that the angle of the ball joint mount is reversed top to bottom changing the angel of the ball joint. Note: If you swap your control arms right to left in addition to flipping them, your alignment will be closer to your final setting. Its best to check it your range of motion before tightening everything up. Do this by marking your spring location and then loosening your spring perch. Jack the suspension up so that the lower control arm is approx level. Turn the steering from lock to lock and check for any ball joint binding or other clearance issues. One place to watch for is the brake to upper control arm ball joint area. Repeat this by measuring the center of the hub and then jacking the suspension up approx 2.5 to 3 Do the same, but at 2 of droop. If all is good you can proceed. If there are clearance issues, this will be the time to address them. Some may need to clearance a bit off the upper control arm ball joint mount. There is a rib of material that goes around the ball joint mount that may require clearancing depending on your brake setup. You will be asked to check this one more time at the end of the installation.

13 Remove the two factory bolts from the IFS bracket from FFR. These are the factory Ford spindle mount bolts and will not be reused.

14 The new IFS bracket goes onto the rear of the spindle. The ball joint hole is to the rear of the spindle also. The dog leg, or elbow on the IFS bracket needs to point to the inside of the car. Refer to the pictures to make sure you have the correct IFS bracket on each side of the car. Temporarily install the new IFS bracket by using the new 5/8s bolts to mount the IFS bracket. Put the shorter upper bolt in finger tight and just slide the longer lower bolt in far enough to hold it in place, do not install the nut yet. Note: make sure your upper brake bracket bolt is installed before installing the new IFS bracket.

15 Remove the rag and reinstall the upper control arm back into the new IFS bracket. Make sure to put the cotter pin hole where it can be reached. Tap (smack pretty hard) the control arm with a dead blow hammer to set the ball joint into the new IFS bracket. Slide the lower IFS bolt out far enough to allow access to the ball joint stud. Install the castle nut and torque to the recommended torque of 60 ft-lbs. Install the cotter pin after the torque spec is met.

16 Now install the IFS bolts for the final time. The upper should be thread locked in place. The lower should use the locking nut. Both should be torqued to approx 150 ft-lbs.

17 Tighten all the upper control arm bolts to the UCAM and the UCAM to the frame. The torque on these bolts is 50 ft-lbs.

18 The following is very important please read and understand the importance of these steps. Mark the current spring collar location and loosen the spring perch as far as possible. Using a floor jack with care not to break the grease fitting off, move the suspension through its travel while looking for interference and checking ball joint angle. If the angle is a problem (not likely) the cup can be reversed. The cup is welded on one side and bolted on the other. Now is also the time to turn the steering wheel through its full arc. Do this at both the compression and droop positions of the spindle. Depending on which brakes and/or spindles are on the car there may be interference with the bleeder screw. This is especially noticeable on the driver side with the ball joint cup mounting bolt. Remember the cup is welded on one side and bolted on the other. The interference will be at the bolt. Finding the interference now is better than breaking the bleeder and having no brakes!!!! Other cups are available without the angle so the bolts can both be on the front.

19 The alignment on the car has changed dramatically. Check the toe in and take the car to the alignment shop ASAP. The new SIA brackets allow for better caster and camber curves so we recommend the same 1 degree of camber for street cars and closer to 2.5 degrees for auto cross cars running radial tires. Caster should be between 3.5 and 4 degrees and up to 5 degrees caster is fine with power steering.
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