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2004-2007 Cadillac CTS-V Performance Mods Discussion, Suspension help!!! D2 coilover kit in Cadillac CTS-V Series Forum - 2004 - 2007; Originally Posted by thebigjimsho No, that's Ground Controls and T2 shocks. Man, that V looks great... Took some work... the ...
  1. #16
    farsighted770 is offline Cadillac Owners Member
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    Re: Suspension help!!! D2 coilover kit

    Quote Originally Posted by thebigjimsho View Post
    No, that's Ground Controls and T2 shocks. Man, that V looks great...
    Took some work... the guy who had it before me must have been a jerk or something . Ha!

    Poor Jim has to see me harass the caddy community and blow up his email. Lol

  2. #17
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    thebigjimsho is offline Cadillac Owners 10000+ Posts
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    Just don't blow up that V. Poor thing has been through enough...

  3. #18
    farsighted770 is offline Cadillac Owners Member
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    Re: Suspension help!!! D2 coilover kit

    Mailman was nice today


    To say she was stoked to get the suspension might be an understatement.


    ----------

    So anyone use this setup stock? What's the ride height with the factory springs? I'm not gonna use them but basic it on the factory fronts are already 8" I don't want it to drag frame.

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    nikdsctsv is offline Cadillac Owners Fanatic
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    Re: Suspension help!!! D2 coilover kit

    Keeping it fresh for an update. From what I have gathered running the springs that come with the D2 kit is not worth the time.

  5. #20
    farsighted770 is offline Cadillac Owners Member
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    Re: Suspension help!!! D2 coilover kit

    Quote Originally Posted by nikdsctsv View Post
    Keeping it fresh for an update. From what I have gathered running the springs that come with the D2 kit is not worth the time.
    you're exactly correct, the UPS guy showed up with something awesome today:

    i went with a set of Swift 8" Springs and thrust sheets(bearings) (as per advice from this forum) and using the suspension frequency calculator and a bit of trig i've found just the right setup(true 4 corner coilover). for my tastes i wanted a stiffer setup that would still be compliant so here's the answer:

  6. #21
    AAIIIC's Avatar
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    Re: Suspension help!!! D2 coilover kit

    What were the original D2 spring rates, and what are the spring rates you've chosen?

  7. #22
    FuzzyLogic is offline Banned
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    Re: Suspension help!!! D2 coilover kit

    Quote Originally Posted by AAIIIC View Post
    What were the original D2 spring rates, and what are the spring rates you've chosen?
    Looking at the picture, it appears that he bought 8" 60 N-m (Z60-203-060) and 120 N-m (Z60-203-120) springs. Equivalent English spring rates are 336 in-lbs and 672 in-lbs. I have no idea why those rates were chosen. 336 in-lbs is softer than the initial period of travel of the GM stock progressive springs. If he puts the 60 N-m springs on the front, the car won't exhibit nose dive over bumps, but it'll be the sloppiest thing in the world at turn in. And he may destroy his fenders while cornering over bumps. Reverse the situation and the car will squat worse than a Porsche on acceleration, and the rear will rotate way out on corners due to insufficient roll stiffness. It will provide better rear traction, but at the cost of inducing large amounts of understeer, not to mention aerodynamics.

  8. #23
    OneFast V is offline Cadillac Owners Enthusiast
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    Re: Suspension help!!! D2 coilover kit

    Quote Originally Posted by FuzzyLogic View Post
    Looking at the picture, it appears that he bought 8" 60 N-m (Z60-203-060) and 120 N-m (Z60-203-120) springs. Equivalent English spring rates are 336 in-lbs and 672 in-lbs. I have no idea why those rates were chosen. 336 in-lbs is softer than the initial period of travel of the GM stock progressive springs. If he puts the 60 N-m springs on the front, the car won't exhibit nose dive over bumps, but it'll be the sloppiest thing in the world at turn in. And he may destroy his fenders while cornering over bumps. Reverse the situation and the car will squat worse than a Porsche on acceleration, and the rear will rotate way out on corners due to insufficient roll stiffness. It will provide better rear traction, but at the cost of inducing large amounts of understeer, not to mention aerodynamics.
    Because the D2's can be setup as true 4 corner coilovers the rear spring moves outward thus adjusting the moment about which it reacts on the rear suspension. Because it moves outward he would have to move down in spring rate to maintain the same wheel rate. 336 for rear coilover setup is pretty close to 700# rear in the stock location.

    From the D2 kit the springs are rated at ~550#/in all 4 corners

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    FuzzyLogic is offline Banned
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    Re: Suspension help!!! D2 coilover kit

    Yeah, you're right.

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    farsighted770 is offline Cadillac Owners Member
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    Re: Suspension help!!! D2 coilover kit

    Quote Originally Posted by OneFast V View Post
    Because the D2's can be setup as true 4 corner coilovers the rear spring moves outward thus adjusting the moment about which it reacts on the rear suspension. Because it moves outward he would have to move down in spring rate to maintain the same wheel rate. 336 for rear coilover setup is pretty close to 700# rear in the stock location.

    From the D2 kit the springs are rated at ~550#/in all 4 corners
    Beat me to it. This is exactly what I'm doin (as I mentioned in my first post I think). I did the math based on fuzzy logics thread, goin for the 1.5 hz suspension attenuation "hot rod sedan" feel. This paired with the hotchkis sways should make for just the right amount of stiff and compliant I'm looking for.

    Sadly with Christmas right around the corner and the car seeing more use (since my daily is down) this will prolly wait till next year to be done. I'll keep you updated.

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    farsighted770 is offline Cadillac Owners Member
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    Re: Suspension help!!! D2 coilover kit

    I searched first and see no good answers.

    I need to do balljoints while I have this all apart. I see upper fronts aren't serviceable and they don't even look like they can be pressed... Lower balljoints can be replaced it seems and I've found greasable onesmoog K80635 http://m.ebay.com/itm?itemId=350730827993) but looking at the Lower control arm do they have to be pressed out?

    My question is what to buy basically so that I have a refreshed suspension before I finish assembly and alignment.

    Also noting I want for have the best feel for the right price so if it means all control arms to be replaced that's fine I just need where to get it reasonable priced

  12. #27
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    Quote Originally Posted by farsighted770 View Post
    I searched first and see no good answers.

    I need to do balljoints while I have this all apart. I see upper fronts aren't serviceable and they don't even look like they can be pressed... Lower balljoints can be replaced it seems and I've found greasable onesmoog K80635 http://m.ebay.com/itm?itemId=350730827993) but looking at the Lower control arm do they have to be pressed out?

    My question is what to buy basically so that I have a refreshed suspension before I finish assembly and alignment.

    Also noting I want for have the best feel for the right price so if it means all control arms to be replaced that's fine I just need where to get it reasonable priced
    Have you seen your lower drivers side control arm? teeheehee

  13. #28
    farsighted770 is offline Cadillac Owners Member
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    Re: Suspension help!!! D2 coilover kit

    Quote Originally Posted by thebigjimsho View Post
    Have you seen your lower drivers side control arm? teeheehee
    Wanna buy a car?

  14. #29
    OneFast V is offline Cadillac Owners Enthusiast
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    Re: Suspension help!!! D2 coilover kit

    All the upper and lowers should press out. that being said they sell them on rock auto.
    farsighted770 likes this.

  15. #30
    farsighted770 is offline Cadillac Owners Member
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    Re: Suspension help!!! D2 coilover kit

    Quote Originally Posted by OneFast V View Post
    All the upper and lowers should press out. that being said they sell them on rock auto.
    That's too much work. I was hoping for a more convenient answer... Try again.

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