It sounds like you have the same problem as others and myself. I did the same thing with preloading and even went to stiffer springs. It did help some but I still had it on larger bumps, I finally came to the conclusion that either keeping the car around a 1" drop or spacers was best for me. As Jasonz stated make sure your car balance is set correctly in the link I added, that helped the most initially. Then like he said also it is finding the balance that works for you and your car. My opinion is that if a customer is going to spend $400 + for a product then it should be designed correctly for its application (Im not a certified Mechanic or anything close, just a home Mechanic). But from my experience the A-Arm is wider and taller so it doesnt work the same with car and causes you to have to make other choices to fix a problem (Example:spacers, progressive bump stops, stiffer springs or even finding the PERFECT preload on a spring)

 

i have a coilover so i'm ok with some clunks and other noises.. I'm not going to drop only 1 inch to avoid clunks hhaahah.
SPC a arms are also a lot heavier than the stock arms. I really didn't like this fact.

 

Yeah the 1" drop wasnt what I wanted either, So Im at 1.5 all around and will be using those custom spacers to get rid of clunk which is the A-Arm bottoming out inside the fender. I want the softer ride with 10k springs in front and not like the Tein ride with 12k all around. So really after countless hours of research and many days of adjustment I think once I get it all installed it will work great. I did confirm a lot of the spacer stuff first with SPC and then talked to 2 different racing suspension places to get to where Im at now. Just has been raining on my days off and has been wet a lot around here, so car is pretty much wintered right now and thats why I havent finished the spacer project. If you get into it you can also change you bump stop to a progressive style, it would be taller and probably would engage sooner. But some of my research showed with a car lowered and progressive bump stops might make your ride stiffer due to the length and the way they work. Every coilover company will have different clearances so what works for me might be different for you. But with BC and SPC I had a 2.25" measurement of clearance along the shaft area that needed to be made up before the bump stop would stop the bottoming out.

 

nice. i'll be really looking forward to your spacers installed. Let us know sooon.

 

ya man, see, that alone I would sell the SPC arms and get arms that you can adjust yourself prior to going, or adjust easily at the shop....so its not so difficult.

once you got a baseline alignment, you can make adjustments yourself with arms like kinetics or SPL..

-J

 

^True. Since i'm not a track guy like you are, so i wouldn't need to change the caster so much. But it would be nice to have to feature of being able to adjust it myself at home.
How heavy are the kinetics? SPC is a lot heavier than stock.

 

I dont know the actual weight, but the kinetics are light, and lighter than spc for sure, ive held spc before..

-J