Schnell Autosports’ rear support bar is a quick and easy way
to make your 981 Boxster or Cayman handle better. There are two frame rails at
the rear of the car that are connected to one another by only a stamped piece
of metal. Under hard cornering or other unbalanced loading, that plate flexes,
which in turn allows the two rails to flex. Installing Schnell’s rear support
bar will solidly connect the two rails together, minimizing any unwanted
movement during spirited driving.
The installation process is simple to do, and only the
following tools are required:
- Socket wrench with 16mm socket
- 19mm wrench
You will want to preassemble the center support bar first. The
jam nuts should already be installed on the rod ends, so just thread the rod
ends onto the support bar. Please keep in mind that the bar is left hand
threaded on one side, and right hand threaded on the other, and the kit comes
with one left hand threaded, and one right hand threaded rod end. If you are
having difficulties threading a rod end into the bar, try turning in the
opposite direction, or try the other side.
After securely raising the rear of your car, you need to
remove 4 nuts that attach the rails to the plate using the 16mm socket.
With the nuts removed, you can now install the support bar
end plates. Make sure the end plates are oriented the correct way; the “raised”
section that the bar will attach to should be on the side facing towards the center
of the car, with the “flat” section with the holes for the bolt studs on the
side facing the rear of the car. Also, make sure that the slots on both plates
are perpendicular to the length of the car, so that the bar when installed will
be perpendicular to the length of the car as well. Once you’re sure the end plates are in the
correct position, you can then reinstall the nuts that you removed prior.
With the end plates securely mounted, now you can install
the pre-assembled rear support bar.
The rod ends will fit into the slots of the end plates.
Align the holes of the end plates with the hole of the rod end, and insert the
provided bolt through the end plate. The head of the bolt should be pointing
towards the rear of the car, and there is a notched area on the end plate
designed for the head of the bolt to sit in (to prevent the bolt from
rotating). You may have to rotate the rear support bar to make the overall
length longer or shorter so that both holes line up.
Once the bolts are inserted, place the lock washer onto a bolt (on the side
facing away from the rear of the car), and then screw the nut on the bolt until
hand tight. Repeat for the other side. Once you have the lock washers and nuts
installed on both sides, you can tighten up the nuts on both sides with your
19mm wrench. Tighten them until snug, and then give it another ¼ turn to
compress the lock washer.
All that’s left is to set the preload on the bar. To do
this, you need to rotate the bar so that the overall length becomes longer, so
that the bar is pushing outwards on the rails. First loosen the jam nuts so that
they are not in contact with the center bar (to make it easier to rotate the
bar). From there, turn the bar so that it becomes wider. A quick way to tell if
you’re going in the right direction is that you will see more threads become
exposed on the rod ends. For most installations, this means rotating the bar so
that the Schnell Autosports logo moves downwards. Ideally, you will want the
bar turned so that the Schnell Autosports logo is facing towards the rear of
the car, with the wider portions of the bar being parallel to the ground. There
are two holes on the support bar; one on the thinner side of the bar to the
right of the sticker, and one on the wider side of the bar, to the left of
where the sticker is. Those holes are for the insertion of any sturdy tool that
will fit (the holes were designed specifically to fit a ¼” center punch), so
that you can give yourself extra leverage to rotate the bar into position.
Once you’re happy with the bar’s position, you can tighten
the jam nuts. Rotate the nuts until they are against the bar (remember, one is
left hand threaded, one is right hand threaded), and then tighten them with
your 19mm wrench. You may have to hold the bar in place while tightening the
jam nuts to keep the bar from rotating.
With the jam nuts tightened, you’re all done. Get your
car back on the ground and go for a ride.
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