SuicidnS13

iTrader: (2)

LOL Ive been on google for like 30 minutes and all I can find are people using RCA kits to allow our calipers to fit GS/IS300's. Don't they offer us added camber in the front? What about the rear kits?

Shmee

iTrader: (3)

Well, the idea behind a Roll Center Adjuster is to regain the proper geometry of the steering and suspension when lowering it.

Lexus uses and interesting design of a lower ball joint and tierod receiver as one piece. The ball joint sits in the Lower control arm(LCA) and bolts to the knuckle. The RCA goes between the ball joint and knuckle to space the ballpoint, tierod receiver and LCA back down to the stock point on a midly lowered car...
Well that is the idea, that i have read in a few places and postings.

Really, it just shifts the knuckle up which means it moves the wheel up, lowering the car further, so you can get an extra XXmm without drastically messing up your steering... the lower you go, the more upward your tie rods point and this causes multiple alignment issues. Keeping the tierod angle closer to flat results in more optimum steering angles. This can also be done with a bump steer kit but that only changes the angle of the tiered which has it's own issues and benefits.


Simplest way I can explain it: more low, less crappy alignment.

dengman

I'm not even slammed any more but my figs 17mm stack makes steering easier than without it. More easier to steer than my MDX.

timmy0tool

iTrader: (7)

RCA stands for roll center adjuster. they take many forms depending on makes and models. for a general overall idea of what they do, see link below.
http://www.meganracing.com/tech/faqs...ct=Suspension:

for our cars, there are two flavors. there are regular RCAs, and there are camber RCAs.

they both space out the knuckle, restoring the correct geometry of the steering, and lowering the car that much more. however the camber RCA, in addition, offsets the knuckle outward which adds camber.

in other cars like the GS and IS, adding front RCAs give more room for a thicker caliper upgrade.

warning: you may not be able to run wheels 16" or smaller with RCAs due the added spacing. my stock LS wheels did NOT fit over my 35mm thick RCAs.

pictured is my studio camber RCA. as you can see it's a spacer between the knuckle and ball joint, PLUS it's offset outward to add camber.


here is a regular RCA for an IS300. this gives more clearance to add a thick BBK like LS400 calipers since it will hit the steering rod ball joint castle nut without them.

PureDrifter

iTrader: (10)

read up:
https://www.clublexus.com/forums/ls4...r-rca-kit.html
https://www.clublexus.com/forums/ls4...sters-rca.html

GSpearlwht

Hi guys..kinda late message but i want to lower my stock GS 300 when i add 19inch rims, there will be a bit of a gap. So how much in inches will this lower my car?

Maybe i dont even have to buy springs or coilovers. Lol

RA40

iTrader: (6)

The approximate drop is minimal, 20-30mm from the ones I've seen.

GSpearlwht

Ok thx but what is that in inches..lol

GSpearlwht

Im trying to keep my stock suspension and add 19inch rims and just drop it about 1inch or so on the 2000 gs 300.