Question about R springs

Discussion in 'Shelby GT350 Mustang' started by kart125, Feb 9, 2017.

  1. kart125

    kart125 Well-Known Member

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    I'm looking to upgrade my Gt350 springs to R springs. I found on the general forums a spreadsheet with all the spring rates from stock to aftermaket springs.

    They rate GT350 F/R to 194/914 and GT350R to 240/914.

    Is there a benefit in going for the rear R springs since the spring rate is the same as the non-R?
     
  2. zzj

    zzj Well-Known Member

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    I think the R springs are a little bit lower regardless spring rate. You don't want lower front springs with higher non-R rear springs. They do have different part numbers for rear springs so there must be a reason for that since they have the same rate.
     
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  3. OP
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    kart125

    kart125 Well-Known Member

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    I've read in other threads confusing info about R springs lowering the car or not... Voodooo confirmed it does not lower the car and he knows his stuff. I agree that if different p/n there must be a reason...
     
  4. Voodooo

    Voodooo Banned

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    The R springs are the way to go. Unless you want to lower the car. The R springs will lower the car 0 to 1/4". For how cheap the springs cost, I bought all 4 and powdered coated mine red so I knew for personal reference which springs I had on the car and wouldn't confuse them with the stock Non-R springs.
     
  5. zzj

    zzj Well-Known Member

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    I remember that post since I was wondering the same when I ordering the springs myself. I research a lot of online info and getting the answers from lowering 0, 1/8 and 1/4 inch. So it's not a very noticeable drop if they are lowered at all. Voodoo had both front and rear on his car. I end up got all of them. Rear pair cost about 200 or so if I remember it right. So I think I'd rather spend a little bit more to make myself worry free from lowering issue.
     
  6. Voodooo

    Voodooo Banned

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    You paid $200 for just the rear springs?
     
  7. zzj

    zzj Well-Known Member

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    Looks like I got wrong memory! Just checked again and I spend 250ish for all springs and 60ish for the rear stabilizer bar
     
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  8. RoadRacer

    RoadRacer Well-Known Member

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    What about magneride recalibration to match the higher spring rates?
     
  9. Voodooo

    Voodooo Banned

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    Not needed.
     
  10. RoadRacer

    RoadRacer Well-Known Member

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    Any other expert opinions?
     
  11. Voodooo

    Voodooo Banned

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    Lol. Ok. I'm not the only one who's swapped to R springs.
    But I am one of the first and you do not need to do anything else.
     
  12. RoadRacer

    RoadRacer Well-Known Member

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    Seems a little odd that increasing the front rates that much wouldn't require a recalibration of the magneride dampers. Is your opinion based on experience with your cars performance or validated by someone with understanding of the programming running our dampers?
     
  13. Voodooo

    Voodooo Banned

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    Thats ok. Don't take my word. Others have done it also.
    DSC, vorshlag, cortex etc.
    you asked and I answered your question. Plain and simple. If you want to run R springs you do not need a recalibration. But I'm also going to use a DSC controller to further enhance my cars performance.
    If you notice my mods below I also replaced all the bushings with bearings, reduced weight with forgeline wheels, pilot sport cup 2 305/30 tires, replaced all the rubber chassis bushings with solid bushings, Vorshlag camber plates etc.
     
  14. Bingo13

    Bingo13 Well-Known Member

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    The re-calibration is not needed. This is based on (7) track events with the R-springs installed and with a Ford Engineer attending an early event at TWS.
     
  15. 65sohc

    65sohc Well-Known Member

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    The Magneride shocks are the same ones used on the Corvette. Corvettes and Mustangs also use the same DSC controller to tune the damping. All Corvettes use same DSC calibration, regardless of spring. In fact the calibration values for the Shelby are identical to those of the Corvette. Michael Levitas has been daily driving an R for the past two weeks and will be releasing updated software and firmware next week. I mentioned to him that my car is bouncy on certain roads. He told me to be sure the "transport blocks" are out from the springs. Has anyone heard of those?
     
  16. Voodooo

    Voodooo Banned

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    Only the R's have the blocks
     
  17. RoadRacer

    RoadRacer Well-Known Member

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    Thank you Bingo13 & 65sohc.....just what I was looking for.
     
  18. xXANCHORMONXx

    xXANCHORMONXx Well-Known Member

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    R springs are way to go.
     
  19. OP
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    kart125

    kart125 Well-Known Member

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    I'll wait until mid april to see what FP will do about their springs... if no news then I'll go R springs and rear sway-bar.
     
  20. Voodooo

    Voodooo Banned

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    I wouldn't wait for the FORD performance springs. They are lowering springs and FP will not release any specs. I've already asked them 100s of times. Unless you just want to lower the car.
    Eibach makes lowering springs also and they give specs.
     
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