06 RSX Type S:

Let me start by saying I installed a brand new set of BC Racing BR coilovers (10kg front, 12kg rear). I already have rear adjustable upper control arms installed from my previous Skunk2 Pro-C setup. I made sure to double check the preload already set by BC Racing. Height adjustments are equal for both rear coilovers.

My problem is when I lower the car the right rear corner ends up tucking the tire while the left rear looks good with the 1/2" gap or so. When I go under the car I can clearly see the spring compressed almost double that of the left rear. I have the fronts already installed and their heights are good to go as well.

Initially I thought it was an issue with the shock or spring on the right rear and BC Racing sent out a replacement Swift Spring after I sent them a vid testing the shock by itself.

I got the replacement spring today, installed it and I get the same result. I then swap the entire left rear coilover over to the right and vice versa, SAME RESULT on the right rear corner, it sags while the left is good.

I spent about an hour under the car looking to see if somehow I have suspension or frame damage and I cannot find anything out of the ordinary. My adjustable rear upper camber arms look like the bushings are going to need replacing sometime as they don't sit evenly in the housing. But my control arms, subframe, subframe brace, swaybar, knuckle, and anything else looks good. I took a ruler to compare measurements and I used the thin edge of a ruler to make sure my control arms and subframe weren't bent horizontally or vertically. To make matters worse my loosened preload skunk2 coilovers didn't sag like this, but they do have a much taller spring. The bc racing use a 5" rear spring while the skunks look an inch or so taller with more coils in the spring.

I'm clear out of ideas. I was thinking even if the garage floor was uneven it shouldn't cause that much sag in the corner. Even if I try to match on ground ride height I'm extending the bottom shock mount of the right rear to where there's barely any threads left in the housing, basically unsafe for driving. I never had this issue before with skunk2s on my civic or rsx. I swapped to bc for the rsx because my front right skunk2 coilover went bad and they no longer offer the pro-c's (adjustable upper camber plate) or any type of solution so I'm done buying skunk2.

Thanks for any help.

 

I’m not a suspension expert but have some basic knowledge.
Most alignment shops will do a suspension safety check for free, and tell you if any suspension components are worn/bad.
You can also ask them to check your alignment (that will probably cost you).
Since your right rear tire is tucking in, my semi-educated guess would be your right upper control arm. Alignment is either off or bushings are bad.
Garage floor level won’t cause this problem.
With the rear end raised, suspension unsupported, measure the distance from the wheel/hub center to the fender wheel opening (perpendicular to the ground) on both sides, then do the same with the car lowered. Subtract the second measurement from the first for both sides then compare right to left. The difference is how much your right suspension is “drooping”. If strut assemblies are ok and spring heights are adjusted the same (which I assume they are, since you already swapped them), then that only leaves upper strut mounting damage (unlikely), knuckle damage (unlikely), sway bar damage (unlikely but possible), and upper control arm damage or bushing wear.

 

I have a customer vehicle scheduled in a few weeks for that exact same product installation. We're big fans of BCRacing. We tried a number of different products on a Tiburon and fell in love with those for that car. Thats all we use now.

Anyways, our customer has an 06 type S. Ill be sure to take a look at the suspension back there and let you know if see anything to look out for.

 

You realize, this is a 3+ year old dead thread you guys are responding to.

Thread closed.