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Motion ratio is the ratio of distance the wheel travels divided by the distance the pivot point of the spring travels. Or the inverse of that depending on which wheel rate equation you use. So in macpherson strut, it's very close to 1. I have a post above explaining the math and if you should...

Technically...no i think

Yea agreed. I have my pins pulled and I'm at -0.9. So with ball joint it would put me at -1.9. Still not great...but better than normal lol.

How camber were you able to get with the ball joints?

Feel free to verify my motion ratios though! I would love another set of eyes on it.

I measured the MR myself. I'm used to doing motion of wheel to motion of spring, hence >1. So if your wheel rate equation uses <1, take reciprocal. The wheel rate calculator I'm using is Wheel Rate=Spring Rate/MR^2. If you're using WR=SR*MR^2, then take the reciprocal of my MR.

And we ran 2 courses. This is the other one, which was super fast, and plenty of oversteer. I love the Honda's setup from the factory (except tires):

First autocross of the season and it was during a snowstorm. Super fun, I was running everything stock except Blizzak tires. 245/40/18 front, 225/45/18 rear on stock wheels.

That's a tough question to answer! I believe the car in stock form is really good. The biggest difference for me was tires. I ran 245 front and 225 rear in reverse stagger and that got me the balance I wanted on stock suspension. From there, if I wanted better track performance, I would get more...

Sadly no video! Next season for sure. Just figured out how to mount a camera safely in the position i want.

Also having driven in stock form, I'm convinced I don't need anymore rear bar. I'm easily getting lift-off or trail brake oversteer on stock bars. In fact, i ruined my last run at last event because I ended up drifting tail-out around an entire corner by accident. Yes there's corner entry...

Just tires, nothing else yet. I did pretty well in GS, but got beat by a GTI. I do my own alignments. I got as much neg camber as I could by pulling the strut pin. Ended up at -1 on driver side, -0.9 passenger. Running slight toe out, about 1.5mm total toe. Only did alignment once. My Mustang...

I will say it was really fun driving on all-seasons at the practice event. Albeit slower, but it gave me a good baseline on the car's handling. Right now, i have 255 front, 225 rear reverse stagger on stock 8" wide wheels (yes they fit). I was going to spring for RE21RS or RT660 200tw 245's...

Glad you're getting to autocross the car! Here is my perspective on a few things... 1. (Fact, not perspective) To stay in street class, you have to stick with the same wheel width, and within 1" of OE wheel diameter. So you can do 17x8 and put 245 or 255 tires on. 300tw is a pretty good place...

There's a handy guide from SCCA here: https://www.scca-classifier.com/a/index.html Has all the allowed modifications and classes for your chosen vehicle.

@DYI01 does the FK8 spring become unperched at full droop if you don't need a spring compressor to get it in?

Would love to talk about your STH setup! I'm only doing local events, running GS. Only thing I have so far is tires. Aug 27 will be my first event with the SI. The car is a few weeks old! Eric

Great to know! Used OEM is my favorite option. Too bad there's no OEM option to get more negative front camber (not that I've seen at least).

Thanks! Will the FK8 front springs lower the ride at all? I'm liking the stock ride height actually. (I'm new to Civics, used to my Ecoboost Mustang and all of it's options).

I'm autocrossing my newly acquired '23 Civic SI in GS now with the possibility of prepping it for STH. I wanted to get some data on how the car is set up stock. I started by measuring calculating the motion ratio of the front and rear suspensions, and used the published total mass and weight...