Type R Club of America

aw614 wrote: ↑Fri Aug 13, 2021 8:42 pm Honed Developments just released their EG/DC Upper control arms for pre-order
https://honeddevelopments.com/product/e ... amber-arm/

dcharles85 wrote:Have been looking at a handful of Honed pieces. Would love to hear your feedback once you have installed and a few miles on them.

-David

coolhandluke wrote:Here are two clips I meant to recreate, but never did, maybe when I get a replacement track car and my new GoPro Hero 10:

Rear suspension, by Erik95LS at Autobahn Country Club at Type R Expo 10:


Front suspension, by Greg Amy at Road America for the 2013 SCCA runoffs:

aklackner wrote: ↑Fri Jan 07, 2022 12:52 pm

coolhandluke wrote:Here are two clips I meant to recreate, but never did, maybe when I get a replacement track car and my new GoPro Hero 10:

Rear suspension, by Erik95LS at Autobahn Country Club at Type R Expo 10:


Front suspension, by Greg Amy at Road America for the 2013 SCCA runoffs:

Very interesting to see thanks for sharing.

Looks like pic coilovers, ASR brace with OEM ITR ARB? Were you happy with the setup?
Do you remember spring rates?
Rear inside looks to get light to the point of lifting a bit, was this noticeable/worth doing something to address (stiffer front ARB or spring?) or would that limit travel to the point of impacting grip (maybe depends on track surface)?

Interesting to watch the geometry of the front when the body rolls hard you can see it start to lose a little bit of camber with the lca starting to swing back in more then the uca, but looks like the lca motion is centered in the arc well enough that it wouldn’t really be noticeable. If the car went lower I could see a case for an extended lower ball joint to get the lca down further.

DC2Iggy wrote:What's the general consensus on extended ball joints/roll center kits? Did some looking into them this afternoon but most threads are 2010 or older and the opinions are divided. A lot of companies made/make them but Honed Developments seems to be the only one that's done "testing" and has posted their findings online.

I need to replace the ball joints on my ITR and wondering if I go with the oem length ones or go with extended ones if there are benefits. My car is slightly lowered on GC/Koni and lately it's been more of a autocross/lapping car than just daily driving. Any point of going with extended ball joints?

aklackner wrote: ↑Wed Feb 09, 2022 9:10 pm

DC2Iggy wrote:What's the general consensus on extended ball joints/roll center kits? Did some looking into them this afternoon but most threads are 2010 or older and the opinions are divided. A lot of companies made/make them but Honed Developments seems to be the only one that's done "testing" and has posted their findings online.

I need to replace the ball joints on my ITR and wondering if I go with the oem length ones or go with extended ones if there are benefits. My car is slightly lowered on GC/Koni and lately it's been more of a autocross/lapping car than just daily driving. Any point of going with extended ball joints?

From what I’ve consumed, it’s generally very hard to correct double wishbone geometry once lowered. If a lowered a small amount (LCAs are level or angled slightly up to the inside, under weight) I believe you’re better off running OEM ball joints.

If lowered aggressively (LCAs point down to inside), to reduce center of gravity, and running stiff race suspension then raising the roll centers (front and rear) may be desired since the shift in geometry will move the roll center further from center of gravity increasing effective roll forces.