I picked up a car that already had Karcepts MCS 2WNR w/ 400F/500R springs.
I've finally settled on this for sporty driving:
Front:
7 rebound / 4 compression
Rear:
9 rebound / 4 compression
Camber:
-3.5 F / -2.x R
Karcepts front bar on 2/2
This is with 17x9 Michelin PS4S in 245/40 @ 28psi. I still haven't made it to the track yet, but I doubt I will change it much there. Maybe a tad more rebound.
I really struggled to tame undulations with this setup. High speed shock movements like potholes and bumps are fine. Minor imperfections in the road can cause the car to jitter vertically. Letting a bunch of air out of the tires and bumping up compression helped.
Quote:
Originally Posted by X25
Car: '23 BRZ Premium
Wheels/tires:
On APEX 17x9 +35 / +42 F/R wheels:
Hoosier A7/R7 245/40/17, or Z214 245/40/17
On stock wheels:
RT660 225/45/17
Springs/shocks/coils:
450 #/in (78 N/mm), 550 #/in (96 N/mm) MCS 2WNR
Stock sway bars.
DD/Canyon/Track:
Track (HPDE) use.
Driving experience:
HPDE Advanced, Instructor, etc.
Other suspension mods:
Rear UCAs and toe links.
Camber/Toe:
-4.2 / 0 toe / 6 degrees caster front, -2.5 / 0.15 degrees Toe (in) rear
(optional) thoughts/opinions:
As I'm building this car for HPDE use, tested out these coilovers for the first time at the track, today. With Karcepts' recommended settings (minus their sway bar), the car felt very soft and a bit bouncy. Their settings are 2 / 6 comp/rebound front, and 3 / 7 rear. It felt a lot more stable after +1 rebound and +4 compression all around. I should probably add a bit more rebound, but did not want to mess with it as I was testing out other things as well (e.g. new pad material).
Does the Karcepts sway bar make a significant difference in your experience?
What spring rates do you guys use for HPDE only track duty? The springs I have with recommended settings felt very soft, and I wonder if I should seek stiffer springs, or just compensate with higher compression and rebound; tough to figure it out without knowing much about this platform : )
From yesterday..
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