[jpnovak]

Great progress. I think an early rectangular flag mirror painted black (or gray) would be perfect.

You must have amazingly smooth roads around you to run that tight of tire at that low ride height. Around hear you would be scraping the front a-arms and heat exchangers at every dip driving the fun roads.

I am going back to your questions about spring rates.

The stock spring rates are really soft. 21/27 (28) is a really good combination. To make the final decision depends on the balance of the car. You have corner balance numbers? Do you have before/after numbers? Ultimately you need to use the weight loss from front or rear as a guide to add/remove spring rate from one end of the car. For example, if you dropped a bunch of weight of the front of the car its relative stiffness to spring rate (wheel load weight) will be higher. Spring rates are in force applied multiplied by distance compressed. So, lighter weight is less force applied and the relative stiffness is increased. to maintain the same balance you either take away from the front or add spring rate in the rear.

Perceived ride quality is influenced by how much travel your suspension can move. There is a fine line between firm and harsh. Firm is what you want to resist body roll. Harsh makes teeth rattle and kidneys scream for help.

First, low friction bushings (many vendors) really help reduce harshness. They allow the suspension to move freely with changes in the road. Second, proper damping with higher spring rates requires softer compression damping and slower rebound compression. You want the suspension to quickly compress easily to absorb a bump and then slowly spring back with control.

Just keep some of these thoughts in mind as you get to the point of really setting up the car. I am a believer in larger torsion bars and softer sway (anti-roll) bars. Use actual springs to support the car and sway bars to control body roll and fine-tune overall balance, turn-in, etc.

Personally, I think 23/30 would be too stiff on the street for me. Fun for a quick jaunt but hard on the body if you want to spend multiple hours pushing limits.

I have 21/28 in my car with Rebel bushings. Compliant and firm. I have Koni Sport adjustables and have set the rebound damping to match the cars weight and effective oscillation control. With proper alignment and corner balance the car is planted, stable, minimal body roll and confidence inspiring behind the wheel.

Keep having fun.

Have you spent any time tuning the engine/EFI?