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To complement our other link and arm offerings, the RC-F/GS-F product category gets a new adjustable front upper arm (FUCA). We have built these arms to handle track abuses as they were based on our IS-F Nurburgring arms with added structure for the heavier chassis.   With lifetime poly bushing (custom build option) or spherical rod end 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 completely boxed for strength, easy to adjust without an alignment rack and allows a perfect balanced offset for wheel/tire fitment of camber curve modification.  The Ball joint angle has .  We leveraged our past 4 years of PROAngle testing and competition on the JZX90 platform and created a similar design for the F that is fully boxed, TIG welded and has a compound camber/caster adjustment via the outer rod end.  An additional adjustment is made with optional inner SuperPro Poly bushings.

 

Features:

  • Boxed Steel plate construction for max strength.
  • 100% Precision TIG welded.
  • 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)
  •  Precision FK PTFE Spherical Bearings on the inner mount.
  • 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 additional security.
  • Never tamper with the outer ball joint assembly as it is retained with several adhesives for safety.

 

 

 

Adjustment

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. Since the lower arms are fixed as well and the subframe is aluminum, the static offset should general asymmetric 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 predetermined 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.

 

Options

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 bodywork, 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 advice on adjustment and general ranges for fitment.

 

Currently, the only offering is with Spherical bearing inner mounts.
 

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 produce 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 judgment 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.

Lexus RC350 2015-2023
Lexus RC200t 2016-2017
Lexus RC F 2015-2023
Lexus IS500 2022-2023
Lexus IS350 2013-2023
Lexus IS300 2016-2023
Lexus IS250 2013-2015
Lexus GS450h 2013-2018
Lexus GS350 2013-2020
Lexus GS200t 2016-2017
Lexus GS F 2016-2020

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LEXUS RWD TRACK SPEC FRONT UPPER CONTROL ARM

  • $1,047.38


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Tags: is, 500, RCF, gsf, gs-f, rc-f, fuca, camber, kit, front, upper, control, arms, track. RCF. GSF. IS200T, RC350, SETUP, PHDE, TRACTION, FRONT, is500, gs350, gs450h, is250