To complement our other link and arm offerings, we now
round out the set with rear adjustable upper control arms (RUCA) for the
SC300/400, Gen1 GS300 and MKIV Supra. We have built these arms to handle
drift and track abuses lifetime poly bushing or spherical inner bearing options
and high-misalignment outer spherical ball joint to handle the extreme
conditions of drift and track use. The setup is light, easy to adjust
without an alignment rack and allows a perfect balanced offset for wheel/tire
fitment of camber curve modification.
gusseted construction for max strength.
cups are Precision TIG welded and
plate ribs are MIG welded.
mild rear camber offset for traction (road race) or positive camber for
more contact patch under squat (drag/drift). At a 2" drop, 5 degrees of total
adjustment range between +2.5 and -2.5 over non-adjustable stock arm.
conjunction with our Adjustable LCA and toe links these arms sweep between
+4 and -8 degrees of camber. If going positive camber that we would
include a grade 8 jam nut for the best thread support.
Lifetime Poly bushings for inner mounts or custom Precision FK PTFE
joint replaced with Precision High-Misalignment PTFE Rod end and
monolithic Chromoly taper stud.
joint set with Belleville washer on the jam nut for addition security.
Our rear arms are symmetric adjusted meaning you
adjust both sides by the same amount via the outer rod end thread. Though
it may appear inconvenient, the upper arms should be adjusted as a fixed offset
and infinite turnbuckle adjustments can create differences from side to side
impacting handling and steering bias. Lower links offer the infinite adjustment
for fine tuning and are a better place to manipulate camber and toe changes for
a stable geometry. Alignments are always iterative, meaning as
adjustments are made to one link, the other will need small adjustments as
well. By fixing the rear upper to a finite offset in graduations of
1/16" we are simplifying to overall alignment process.
Primary adjustment is done with the wheel off as a
static offset. Start with a deterministic number of turns on the upper
rod end from fully seated. This means thread it in completely, then spin
it out the same number of turns per side. The max strength of the rod end
will de-rate after 10 turns outward or 0.625" of exposed thread beyond the
jam nut. We strongly suggest keeping the max thread engagement possible
to maximize safety. If using these arms for positive camber correction we will
include a grade 8 jam nut to provide additional support. Each turn (full
rotation of the rod end) will net close to .8 degrees of camber change.
We build these with several options for customization
and user input. If one of our options does not meet your vehicle goals
contact us about custom options. Camber goals are a starting point but given
the specialized nature of wheel fitment and body work, we ask for a center
point on the arm length for custom setups and we will also provide a
length offset number for our standard configurations. We have complete
suspension maps and can offer setup advise on adjustment and general ranges for
SuperPro Poly Inner Mounts: The best for long life and low maintenance.
Lifetime poly features grooves to hold grease and a break-through material that
is unlike any other Polyurethane on the market. Guaranteed to not egg
out, deform or migrate, this is the best Polyurethane we could find and we have
looked all over the world. An added benefit of our design is that we use
factory bushing dimensions. This allows
us to reuse SuperPro bushings that were previously purchased and perhaps
installed in the factory UCA. At this
time we have only confirmed OE SuperPro bushings and we do not suggest another
brand due to fitment tolerance and potential failure due to improper fit.
Spherical Bearing Mounts: The most precise, free-moving motion transfer
connection, these bearings are a must for higher loads and stresses from
aggressive wheel fitments. The bearings can product low speed squeaking related
to the tight interface and PTFE fabric but PTFE dry lube worked into the
interface should resolve the noise.
Safety and Maintenance
Like all of our products, these are arm provided for
customers to use AT YOUR OWN RISK. Proper setup, alignment and
installation should be done with reasonable and prudent judgement and any
concern should be raised immediately. Arms should always be inspected
within 100 miles of original install and inspection of jam nuts and mounting
bolts should be verified to be fastened securely. Rod ends should be
centered on their mount to minimize bias and maximize misalignment. Rod ends
should only be lubricated with PTFE dry lube and never grease. Rubber
boots are available however frequent internal lubrication is required again
with a PTFE dry lube.
REAR UPPER CONTROL ARM VIP AND CORRECTING MKIV SUPRA SC 300/400 GS300