I want to lift my S197 GT350 a little bit

Discussion in 'Suspension and Chassis' started by Fat Boss, Jan 2, 2019.

  1. Fat Boss

    Fat Boss TMO Addict

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    Guys,

    I love my widebody convertible, but there is a specific issue with the rear suspension. Both rear tires rub on the fiberglass quarters over medium to big bumps in the road. It's not a centering issue since they both rub about the same haha. I was wondering if some adjustable coil overs would be the best course of action. The wheels and tires are 20x13 with 345's. The wheels are very rare and specific to the widebody cars so I don't want to change them out.

    Any suggestions? Frankly I wouldn't worry about it, but I can smell the rubber every time since it's a convertible and it annoys me. Better handling would be great bonus. I think it's got some sort of Ford Racing shocks and struts from the build at Shelby American.

    CSM 133500068. Does this widebody make my butt look fat? :oops:

    [​IMG]
     
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  2. Competition Orange

    Competition Orange TMO Advanced

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    narrower tires...
     
  3. Fat Boss

    Fat Boss TMO Addict

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    I guess that's an option. With the s/c Coyote she's got a lot of power and can use all the traction she can get.
     
  4. racer47

    racer47 All I got left is fast

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    The cheapest / easiest way is stiffer rear springs. 12" x 2.5" coil over springs fit in place of stock springs. You would need something like a 185 lb to 200 spring rate. But this will be non-height adjustable.

    There are adjustable rear spring perches like this that will give ride height adjustability https://www.maximummotorsports.com/...ters-with-helper-springs-2005-2014-P1483.aspx

    You probably don't have room for a true coil over because of the tire size and limited clearance between the tire and shock.

    But whatever you do, going to a smaller tire and / or wheel is just not an option :)
     
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  5. Fat Boss

    Fat Boss TMO Addict

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    Thanks racer47. I've never seen those before. I'm not sure I want to go this high though:

    "For any particular spring, the minimum adjustment setting will raise the rear height by 1.85", compared to the same spring installed without this adjuster."

    Good point about clearance for coil overs. I'll hit up the boys on Team Shelby and see what the optional suspension was for my car.
     
  6. racer47

    racer47 All I got left is fast

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    Last edited: Jan 3, 2019
  7. ArizonaBOSS

    ArizonaBOSS Because racecar. Moderator

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    CorteX Cambered Rear Axle, duh.
     
  8. Fat Boss

    Fat Boss TMO Addict

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    Thanks. So If I went this route, I'd buy a spring set that matches for what I would want to do? I have no idea what springs are "stock" on the car, but I have that question posed in my thread on Team Shelby.

    LOL, If I were caging the car and making a racer I might.
     
  9. racer47

    racer47 All I got left is fast

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    Yes

    If your springs are Ford stock, they will be about 150 lb/in. If you want a near stock ride at near stock ride height, then 175 or 185 lb/in, 10" tall, 2.5" dia springs and the adjustable perches, should be about right. If you need extra ride height, then maybe 11" springs are needed.

    The stiffer the spring, the less ride height you will need to stop the rubbing. When you get up near 200 lbs and higher, the ride difference will be noticeable. 250 will be very noticeably stiff.

    175 lb/in or 185 lb/in is what I would consider stockish ride. The stock GT rear springs are too soft. So a little rate increase is better. If you knew your current spring rate and free spring height, I could give a more exact answer.

    But, in reality, coil over springs are relatively cheap. I'd just buy the perches, take my best guess at a spring and give it a try. If its not exactly right, buy a different pair of springs.
     
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  10. Competition Orange

    Competition Orange TMO Advanced

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    What kind of tire?
     
  11. Fat Boss

    Fat Boss TMO Addict

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    Thanks for the advice. I've got an email in to Shelby American asking what exact springs came on the car. I'll update when I find out.

    Pilot Super Sports.
     
  12. Competition Orange

    Competition Orange TMO Advanced

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    You're trying to compensate for a lack of grip from the mpss with width. If you get some better tires (more sticky) you'll have even more grip, proper fit, no rubbing, and best if all better performance.
     
  13. Fat Boss

    Fat Boss TMO Addict

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    Well technically I'm not trying to compensate for anything other than the rubbing since the tires are bone stock for the car. That is a decent idea to go with a narrower tire though. Sounds like whatever I do it's gonna cost me.
     
  14. racer47

    racer47 All I got left is fast

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    If you don't want to spend any money, make a 1/4" (or 3/8" or 1/2") plywood shim and put it on top of rear springs between the rubber isolator and the chassis.
     
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  15. Fat Boss

    Fat Boss TMO Addict

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    Oh man you're reminding me of when my dad made wooden, yes wooden motor mounts for his 71 F250 when he swapped out the 360 for a 400...
     
  16. racer47

    racer47 All I got left is fast

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    They can be steel or aluminum if you want but then you are taking a chance of making noise. Wood is quiet and will work well. You can also shim between the spring and axle but that would need to be metal because there is less surface area to work with and it will get wet in the rain.
     
  17. 302BOB

    302BOB TMO Addict

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    When you own cars like ours that comes with the territory.....unless you get lucky..;)
     

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