spring rates on REAR coil-over conversion????
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2004-2007 Cadillac CTS-V Performance Mods Discussion, spring rates on REAR coil-over conversion???? in Cadillac CTS-V Series Forum - 2004 - 2007; hey guys i know its been covered to some extant but i cant find any of the therads about it. ...
  1. #1
    runsfromdacops is offline Cadillac Owners Fanatic
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    spring rates on REAR coil-over conversion????

    hey guys i know its been covered to some extant but i cant find any of the therads about it. im trying to track down the spring rates for the REARs that have done the coil overs. i think some guys were doing it with the front springs from a GC kit. but any info would help. im trying to make a set of strange coil-overs work on my V

    -alex
    thanks for the help guys

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    OneFast V is offline Cadillac Owners Enthusiast
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    Re: spring rates on REAR coil-over conversion????

    If you talking about a true coil over in the rear generally 350#-400# would be the preferred rate. if you are taking about just putting in a new spring where the old one was with the addition of an adjustable collar than the spring rate are generally the spring rate of the front +50# i.e. 550f/550r

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    FuzzyLogic is offline Banned
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    Post Re: spring rates on REAR coil-over conversion????

    The maximum I recommend for linear springs is 650 in-lbs front and 700 in-lbs rear for a Ground Control-type setup. It's a little uncomfortable for girls, though, so you may want to consider starting at 600 in-lbs front and 650 in-lbs rear. If you have true rear coilovers, you're going to want to drop the rear spring rate by about 100 in-lbs.

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    runsfromdacops is offline Cadillac Owners Fanatic
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    Re: spring rates on REAR coil-over conversion????

    thanks fuzzy.
    im talking true coil over IE moving the spring on to the shock

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    OneFast V is offline Cadillac Owners Enthusiast
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    Re: spring rates on REAR coil-over conversion????

    Quote Originally Posted by runsfromdacops View Post
    thanks fuzzy.
    im talking true coil over IE moving the spring on to the shock
    If you run 650 front then you should run 350 rear. If you run 700 front then you should run 400 rear.

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    FuzzyLogic is offline Banned
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    Re: spring rates on REAR coil-over conversion????

    Quote Originally Posted by OneFast V View Post
    If you run 650 front then you should run 350 rear. If you run 700 front then you should run 400 rear.
    I can't find the thread at the moment (at class), but I thought that a lot of CTS-V people were unconvinced that the rear spring rates should be that low. Last I checked, people were ordering 500 and 550 in-lb springs, but I never heard impressions.

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    runsfromdacops is offline Cadillac Owners Fanatic
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    Re: spring rates on REAR coil-over conversion????

    yeah i would think it would be higher. i just want to see what the norm is on the coilover rate so i have a good starting point. im sure ill goo atlest 100lbs over what most do as im going to be drag racing it alot

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    odla's Avatar
    odla is offline Cadillac Owners Connoisseur
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    Re: spring rates on REAR coil-over conversion????

    I thought that for drag racing you want the car to squat. So you would want a softer spring?

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    OneFast V is offline Cadillac Owners Enthusiast
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    Re: spring rates on REAR coil-over conversion????

    I measured the while rear suspension and did the calculations to tune the car for the proper frequency. I will post that sheet when I get to my computer. If anything drag racing requires softer springs.

    ----------

    see attached. if you'd like a further explanation i can elaborate.

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    JDB
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    Re: spring rates on REAR coil-over conversion????

    Quote Originally Posted by OneFast V View Post
    If you run 650 front then you should run 350 rear. If you run 700 front then you should run 400 rear.
    Sure, if you want an ass dragger for a drag strip car to hook up.

    Not good for a road course track car.

    550/650 here

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    OneFast V is offline Cadillac Owners Enthusiast
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    Re: spring rates on REAR coil-over conversion????

    Quote Originally Posted by JDB View Post
    Sure, if you want an ass dragger for a drag strip car to hook up.

    Not good for a road course track car.

    550/650 here
    You misread. This is exclusively if you are converting the rears to coilovers. If std setup then yes you are correct.

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    BradCTSV is offline Cadillac Owners Fanatic
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    Re: spring rates on REAR coil-over conversion????

    I have the LG true coilovers in the rear and I believe they are in 500 lb range. Fronts in 700 lb. range

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    Re: spring rates on REAR coil-over conversion????

    I've got 600 in the front, 650 in the rear in the stock perch.

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    OneFast V is offline Cadillac Owners Enthusiast
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    Re: spring rates on REAR coil-over conversion????

    Quote Originally Posted by BradCTSV View Post
    I have the LG true coilovers in the rear and I believe they are in 500 lb range. Fronts in 700 lb. range
    LG motorsports are 700/400

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    Re: spring rates on REAR coil-over conversion????

    Quote Originally Posted by OneFast V View Post
    LG motorsports are 700/400
    And Angelo Zarra (engineer) recommends the same 700/400 for Anze Suspension's Penske-based true coilovers.

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