Quote:
Originally Posted by marco_mc22
How’s the car with those rates? Are you on stock diff?
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Stock diff. Rates seem great. Puts down power way better than I had expected and it's balanced *really* well with 1/4" of rake (rear higher than front) measured hub to fender.
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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I think you need a little softer front spring (400 lb/in?) and way more front swaybar to fix the softness. If you're not going to be constantly going to different tracks or messing with car setup in changing conditions, the Karcepts bar is overkill. I love the Karcepts bar for autocross because every site is different but if I was building for solely HPDE I'd just do a Perrin 19mm or 22mm (maybe buy both in case you want to swap)
The MCS shock settings seem pretty reasonable from what I know of Karcept's MCS 2WNR valving. I've seen folks run as high as 10 clicks of compression though, so you definitely have room to play with the shocks.