2 Week Build Time
To complement our other link and arm offerings, the
IS300/JZX110 product category gets a new adjustable upper arm (FUCA) We have built
these arms to handle track abuses as they were derived from our Lap Record Setting arms used on the ZEN MOTORS Time Attack IS300 which set the GTA street class track record at Road Atlanta in 2016.
With lifetime poly bushing
or spherical inner bearing options and high-misalignment outer spherical ball
joint, these have all the necessary components to handle the extreme conditions
of 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. We leveraged our
past 4 years of PROAngle testing and competition on the JZX90 platform and
created a similar design for the IS300 with a
compound camber/caster adjustment via the outer rod end. Additional
adjustment is made with optional inner SuperPro Poly bushings or via the 2 rod end based inner mounts.
- Reinforced Steel plate construction for max strength.
- MIG/TIG Construction
- Setup for
mild front camber offset for traction (road race) or positive camber for
more contact patch for straight line grip (drag/drift). Max range is -4.5
to -1.5(with grade 8 jam nut)
Lifetime Poly bushings for inner mounts or Rod Ends for ultimate precision.
- Outer ball
joint replaced with Precision High-Misalignment PTFE Rod end and
monolithic Chromoly taper stud.
- Outer ball
joint set with Belleville washer on the jam nut for addition security.
- Never tamper
with the outer ball joint assembly
as it is retained with several adhesives for safety.
Our 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. Since the lower arms are fixed as well
and the subframe is aluminum, the static offset should general a symmetric
camber curve on both corners. Alignments are always iterative, meaning
as adjustments are made to one link, the other will need small adjustments as
well. By fixing the front upper to a finite offset in graduations of
1/16" we are simplifying to overall alignment process and also making it
easy to adjust to a predetermine setting instead of a measured setting.
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
The center tube of the bushing is centered and concentric, no adjustment
and centered pivot.
The center tube is knurled and offset drilled making adjustment possible
depending on how they are clocked when the mounting bolt is tightened.
Knurls bite into the sheet metal to hold the center tube in place during
normal operation. These bushings
can be adjusted on-vehicle by unbolting the ball joint of the upper arm,
rotating the arm with the bolts loose, then tightening the bolt again to
hold the center tube. The tube will
rotate around 15-20 degrees per swing to adjust clock. Generally we suggest using this as range
offset for your desired settings, meaning full in or full out to reduce
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.