[TRZ06]

Originally Posted by Ryephile

You're welcome, I'm glad it's helpful.


To put it simply, the more track-focused you want the car to be, the less bushing rubber and more spherical bearing [aka pillow ball] you want every pivot points to be. Bushings are compliant and on a track car you want the utmost precision and repeatability.

This means all the BMR spherical bearing stuff and Moreno camber plates. The rub with that, however, is the factory rubber bushings are used as supplemental spring rate. Swapping out all the OEM links for BMR links will actually lower your dynamic wheel rate and make the car roll, dive, and squat more than stock, which is exactly the opposite you want. You make this up with stiffer main coils (read: Ground Control coilover/weight-jack kit), and if you want to keep the MRC, that basically means you'll have to get the dynamic wheel rate within a reasonable zone the dampers are capable of handling, which won't be that tough especially if you do some rough measurements with the stock FE4 suspension.


Otherwise, you're ditching the MRC and going either DSSV, or custom MCS or ANZE/Penske. Ironically, the DSSV's would likely be the least expensive, however they're also tuned for the FEA half-rubber setup. It's a known quantity, still reasonably streetable, and you know for sure the setup will work the the Supercar 3R's. Going MCS or Penske opens the door to your wildest dreams, but you'll have to nail down what tires you want to run to build the suspension tuning around them.


Now, the big EASY button is to do a full FEA swap: DSSV, anti-roll bars, front ride links, rear knuckles, rear subframe aluminum pucks, and Supercar 3R tires. They'll all work together because they're designed as such. What's not often mentioned however, is the stiffer dynamic wheel rate now means the car only works best with Supercar 3R-levels of grip. The car won't have as much grip with the street tires, because the spring rates are too stiff for them. If you're OK with the car not being as good on the street, then this is for you.



PittRace looks fantastic, I really need to get out there soon.

That all makes sense to me.

This is why I am only starting out with the rear cradle solid bushing kit from the ZL1 1LE. My only real complaint about the SS 1LE is the rear end moving around too much side to side and too much squat when accelerating.

I figure GM is offering the solid rear cradle bushings as a stand alone option, so it must work and not alter too much elsewhere with dynamic shock/spring, etc.

Granted, I only use the car on the street in spirited driving and mountain road driving, so I don't need to go to the extreme. I just want the rear-end to stay stable and not move around side to side doing transition maneuvers or canyon carving.