Hey everyone, I've designed my own coilover kit using the Bilstein AS2 line of parts as its basis.

Here's a image of the front and rear designs in CAD:



Here are some shots of the machined parts before installation:



Here's a picture of the shock dyno and assembly:



Installed in the car:



Images of the shock dyno graphs:




I went with 700 lb/in front and 375 lb/in rear spring rates (12.5 kg/mm front, 6.7 kg/mm rear). The rear is installed as true rear. I calculated an approximate damper curve for those spring rates and matched the real life builds to those theoretical curves. The Bilstein AS2 shaft I used has an "open" adjuster, so it adjusts both compression and rebound simultaneously (single open hole).

So far I've put about 1k miles on the parts and I'm quite happy so far. The ride is very firm, but not harsh at all, and the handling is definitely sharper with those spring rates. My plan is to turn this car primarily into a track day/weekend mountain car, and this coilover kit is a good step in that direction.

I'm reaching out to the 350z community to see if anyone would be interested in a kit like this... I can order these parts and custom build a kit for anyone. Also, Bilstein shock parts fit inside BC Racing shock bodies, so I can also build these damper curves into an existing BC Racing unit if anyone wants a retrofitted kit.

Feel free to reach out with questions and comments. Thanks for reading!