Recent content by eromani

  1. 2023 Civic Si Spring Rates, Motion Ratio, Ride Frequencies, Autocross

    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...

  2. 2023 Civic Si Spring Rates, Motion Ratio, Ride Frequencies, Autocross

    Technically...no i think

  3. 2023 Civic Si Spring Rates, Motion Ratio, Ride Frequencies, Autocross

    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.

  4. 2023 Civic Si Spring Rates, Motion Ratio, Ride Frequencies, Autocross

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

  5. 2023 Civic Si Spring Rates, Motion Ratio, Ride Frequencies, Autocross

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

  6. 2023 Civic Si Spring Rates, Motion Ratio, Ride Frequencies, Autocross

    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.

  7. 2023 Civic Si Spring Rates, Motion Ratio, Ride Frequencies, Autocross

    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):

  8. 2023 Civic Si Spring Rates, Motion Ratio, Ride Frequencies, Autocross

    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.

  9. 2023 Civic Si Spring Rates, Motion Ratio, Ride Frequencies, Autocross

    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...

  10. 2023 Civic Si Spring Rates, Motion Ratio, Ride Frequencies, Autocross

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

  11. 2023 Civic Si Spring Rates, Motion Ratio, Ride Frequencies, Autocross

    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...

  12. 2023 Civic Si Spring Rates, Motion Ratio, Ride Frequencies, Autocross

    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...

  13. 2023 Civic Si Spring Rates, Motion Ratio, Ride Frequencies, Autocross

    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...

  14. 2023 Civic Si Spring Rates, Motion Ratio, Ride Frequencies, Autocross

    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...

  15. 2023 Civic Si Spring Rates, Motion Ratio, Ride Frequencies, Autocross

    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.
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