Targets (front share of lateral load transfer)

For fast CAM-S on 200TW, RWD, big power:

Turn-in (0–0.4 g transient): 46–48% front – enough bite to point the car.

Mid-corner (0.9–1.2 g steady): 40–44% front – keeps rear planted so you can pick throttle early.

Power-on exit (≥0.8 g with throttle): 38–42% front – traction biased.

You won’t “hold” one number through the whole corner; use springs/leaf twist and bump engagement to bias the curve this way, then use shocks to shape the transients.

How much “geo %” to assume?

Use 12–15% as your baseline when you’re doing paper calcs. If you raise RCs or run very small roll angles, the geometric fraction creeps up; if you soften the platform, it goes down.

Where you are now (based on our runs)

Springs: Kf=1004 (MR=0.55), Kr=620 (MR=0.95)

Roll multipliers for C4 transverse leafs: try front 1.25–1.30, rear 1.20 

Bumps: front bump stop active with no space

With mF=1.25, mR=1.20 and geo 10–15%, you’ll sit roughly 41–43% front once the front bump is in—good mid/exit bias. You’ll want a little more front share right at turn-in.

How to hit the targets (order of operations)

Lock geometry (geo % baseline): keep RC ≈ 4"/3" (front/rear). That’s ~12–15% geometric on total LTD for this platform—don’t chase geo to tune balance unless you need a big swing.

Set elastic (steady-state) split:

Front leaf roll-mult: 1.25–1.30

Rear leaf roll-mult: 1.15–1.20 (you already moved to 1.20; good)

This should put mid-corner front share in the low-40s% with 10–15% geo—right in the window.

Use bumpstops to curve the balance vs travel:

Front bump: keep it, 0–0.25" gap. Early engagement gives a small rise in front share = better turn-in without murdering traction.

Rear bump: keep removed or, if you reinstall, run a 0.5–0.75" gap so it’s a late ramp only on big compressions. Early rear ramp drives the balance too rear-biased mid-corner.

Shape transients with shocks (most important for autocross):

Entry rotation: add rear rebound 1–2 clicks (holds rear down on weight transfer) or reduce front rebound a touch. That nudges turn-in toward 46–48% front momentarily.

Mid/exit traction: back rear rebound off a click and/or add a touch of rear compression so the inside-rear comes down cleanly—keeps effective front share in the high-30s/low-40s under power.

If it pushes on initial turn: +rear rebound or −front rebound.

If it’s too loose mid-corner: −rear rebound or +front rebound.

Fine *****:

Tiny front bar (or +front roll-mult) if you still lack entry bite after shock tweaks.

Tire pressures/temps: a quick way to move 1–2 points of balance without touching hardware.

Front camber (you’re at −3.0°): don’t give this up; it buys front grip without jacking LTD.