First, we refined the Rear LCA mount for the IS RC and GS with a progressive polyurethane mount from SuperPro for performance street driving and tire saving. Now we release our uncompromised track performance solution that has been tested in the 25hr endurance race at Thunderhill on the N1 Racing IS250 Lexus factory-sponsored car. This is the same race Lexus did final testing on the UR engine used in the RC-F. This system provides precise control under braking and acceleration and is specially designed for use with extreme loads of R-comp tires and larger brakes like our 15" front BBK. With complete fore and aft rigidity, this zero deflection mount is a must for all track-going cars looking to improve driver skill and reaction times while also allowing caster offset for enhanced steerING control.
V2 DESIGN: Adds True-Radius Caster adjustment, which takes the true radius from the pivot point on the #1 location of the LCA and adjusts without bind. The easy-set pill mounts are reversible to add up to 2 degrees of caster increase. We also increased the mount precision about the bolts making the mounting that much more precise on the subframe and less prove to shift in the case of high HP drift cars like Andy Gray's RC200 and Ahmad Daham's RC-F CK.
NOTE: In order to use the full caster sweep without binding, we strongly suggest swapping the front #1 bushing to a spherical as well. Contact us to custom make this part. Typically we find that the stock caster is sufficient for most setups once the zero-deflection system is used, but all setups vary depending on which motorsport you are competing in.
ZDS: Zero Deflection System
-Solidly mounts the front LCA in compression and rebound under heavy loading.
-Fine Tune Caster offset adjustment via stainless pill mount offset inserts and coupled with shim spacers for fine-tuning. Couple with our #1 bushings to reduce stress on the #1 arm mount.
-The most precise and responsive suspension motion available
-Precision machined integral bearing mount to utilize factory mounts and to align thrust load accordingly.
-Massive FK Bearing Precision 3P spherical bearings with PTFE liners seal the interface from debris from the elements.
-Stainless steel mount spacers with fine caster offset adjustment.
-Stainless steel pill mount offset inserts for coarse caster adjustment +1 or +2 degrees of caster angle.
-Remove under cover around oil pan to expose rear LCA mount. Lots of 10mm hex head screws.
-Loosen LCA rear mount nut.
-remove 2 chassis brace bolts as well as the large subframe bolt.
-Remove nut/bolt combo on small side mount of bracket.
-Remove rear mount LCA nut.
-Remove the old bushing entirely from the factory aluminum cup.
-COARSE CASTER ADJUSTMENT: Stainless Pill inserts will mount either both inward or both outward. with the bracket pushed outward, it will result in the largest caster increase. The base caster increase is 1 degree over stock, depending on how the factory bracket was installed previously. To utilize the largest amount of caster increase, we strongly suggest using our Spherical #1 mount in conjunction with the rear mount bracket.
-FINE CASTER ADJUSTMENT: Install transition spacer (the one with large chamfer) first, then install offset spacer to increase caster or no spacer to be at factory geometry baseline. We suggest factory geometry first as the benefits of this system are drastic and the caster may not be required on vehicles lowered more than 1" due to factory caster gain.
Reinstall the rear nut to hold the bushing in place but not to final torque.
-Reinstall 2 bolts plus nut and 2 bolts of side bracket. Long bolt through side rail bracket Torque to 204Nm/ 150ft-lbs, short bolt with nut 86Nm/63ft-lbs side rail bolts 50Nm/37ft-lbs
-Verify clean cycling with suspension by loading and unloading. Apply final torque to LCA post nut. Torque to 113Nm/ 83ft-lbs.
-Precision bearings are self-clearing and permanently lubricated with a PTFE liner, but the tight F2 bearing fit means that sometimes they can squeak at low speed. If this happens, follow the rewetting procedure shown on our youtube video on relubing bearings with PTFE dry lube. DO NOT USE GREASE as it can cause bearing separation.