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Need help figuring out suspension issue: D2 coilovers installed

1067 Views 3 Replies 2 Participants Last post by  Charlie5280, 
C
Hey there guys. Trying to figure out a weird handling issue my dad's 1st Gen CTS-V has.

He purchased and installed the D2 coilover kit, but is using them as purchased from a vendor without changing the springs out at all.
(I've been reading about potential issues with this).

Essentially, on right hand turns, the rear end jumps all over the place.....but the more you lean it over and let the sway bars work, it seems to go away.

We have H&R springs ready to install....is the remedy to swap the D2 coilover's springs out at all 4 corners? Just the rear?

I super appreciate the help in this. The car does have a Creative Steel Ford 8.8 IRS with big axles, and a bunch of other stuff (LQ9 427 with forged internals, ported LS3 heads, etc).

Thanks guys!
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AAIIIC
You'll have to be more descriptive than "the rear end jumps all over the place." I'm not sure what you mean by that.
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AAIIIC said:
You'll have to be more descriptive than "the rear end jumps all over the place." I'm not sure what you mean by that.
Click to expand...
Certainly.

To be more specific, it feels as though the rear wheels are literally either :

A.) Toeing out so significantly that it is causing the rear tires to steer the front end of the vehicle
B.) The springs are too short and never are fully loaded. Hence, on right hand turns with low steering angles (<30 degrees), it feels as if
the springs are moving around within their perches.

The best analogy is that it almost acts as if it has a solid rear axle with loose bushings, if you've ever had a F-body or Mustang that had worn rear subframe bushings.
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C
No one has had any issues with coilovers at all??
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