Department of Weights and Measures

Discussion in 'GT350 and S550 Technical Forum' started by cloud9, Dec 28, 2015.

  1. Black Boss

    Black Boss TMO Addict

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    Front 2 piece GT350 rotors are 30 lbs; Rears 18 lbs
     
  2. cloud9

    cloud9 Gary

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    Updated first post. That's 5 lbs heavier than the Boss front. I don't remember weighing a rear. Does anyone know what they weigh?

    The front rotors must be a lot thicker than the rears. That's pretty interesting, but good since we could have used more mass on the front Boss rotors. They should hold up to the heat better.
     
  3. VoodooBoss

    VoodooBoss Rick Moderator

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    Thanks. Does anyone have the actual weights of the wheels?
     
  4. VoodooBoss

    VoodooBoss Rick Moderator

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    Than the stock Boss rotor? The GT350 rotors are significantly larger. I still think a Stoptech or Girodisc two piece will save a couple of pounds vs the stock rotors, maybe more. I'm also curious if the drilled rotors will crack at the holes.
     
  5. cloud9

    cloud9 Gary

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    Yes. Stock Boss front rotors are 25 lbs. To be honest I'm not looking for a lightweight alternative to the GT350 rotors. I'm looking for better heat dissipation and durability. That takes mass.
     
  6. VoodooBoss

    VoodooBoss Rick Moderator

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    The weight savings would be in the hub not the ring so no change in heat dissipation.
     
  7. SCGT500

    SCGT500 TMO Advanced

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    Thanks.

    Though 5 lbs of rotating mass is somewhat significant, at $1000 a pair not worth it for a few weekends a year of track time. :(
     
  8. krt22

    krt22 TMO Advanced

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    Thicker yes, in terms of the hub/ring ratio. The rear rotor has a larger hub (im guessing for the parking brake+weight savings) so much less steel on the rear rotor.
     
  9. 8250RPM

    8250RPM TMO Addict

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    I'd be interested to see a direct fit carbon ceramic rotor that retains the stock calipers.
     
  10. ArizonaBOSS

    ArizonaBOSS Because racecar. Moderator

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    On the brake rotor bit--the 15" Brembo Pro kit that is on the IMSA 350R-C cars and clears 18" wheels uses two-piece rotor assemblies that are 18lbs in the front.
     
  11. cloud9

    cloud9 Gary

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    Iron rings?? What are replacement rotor (ring) costs?
     
  12. 8250RPM

    8250RPM TMO Addict

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    The 10.5x19 GA1R open lugs weigh 20.0 lbs.
     
  13. ArizonaBOSS

    ArizonaBOSS Because racecar. Moderator

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    Yes, iron rings w/ aluminum hats. Replacement ring cost around $375-500 per side depending on if you use StopTech or Brembo, respectively (interchangeable, as I'm told). That is for the 35mm thick, 72-vane rotors.
     
  14. 8250RPM

    8250RPM TMO Addict

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    FORGELINE GA1R open lug 11x19 with PSC2 305/30ZR19

    Rear
    [​IMG]

    Front
    [​IMG]

    [​IMG]

    [​IMG]
     
  15. cloud9

    cloud9 Gary

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    Do you have just the weight of the wheel?
     
  16. 8250RPM

    8250RPM TMO Addict

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    No sorry. I bought them from Darren at FORGELINE already mounted and balanced. They said the wheels alone are 20-22 pounds each


    Sent from my iPhone using Tapatalk
     
  17. VoodooBoss

    VoodooBoss Rick Moderator

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    @8250RPM do you have any photos of the wheels on your car and what finish did you order?
     
  18. VoodooBoss

    VoodooBoss Rick Moderator

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    More on light-weighting your Mustang from The TMO Track Attack mate himself.

     
    Last edited: Sep 10, 2017
  19. VoodooBoss

    VoodooBoss Rick Moderator

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    N4SM 19x11 50et wheel and MPSC2 305/30/19 tires with factory TPMs sensors for square setup on a GT350 or S550. 52.0 lbs + o r- a tenth. So a 10.0 lbs savings over the stock rear wheel. ;D

    [​IMG]
     
  20. Bill Pemberton

    Bill Pemberton TMO Addict

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    Let's see, weighed 170 lbs 5 years ago , now am at 210, so car is not here and I have about 4 months to get rid of 40 pounds of unsightly Faaaaatttt ! Still won't be down to Slim Stud Gaspar's poundage , but it is a start.

    1. +1 , would be able to get back into my racing suit ( $ savings )
    2. +$50 bucks a month eating less junk food ( can spend on parts)
    3. + $50 bucks a month on less beer
    4. - $50 bucks of fun as no beer
    5. +200 -$400 to spend on parts to help the car lose more weight if I achieve the goal.

    Let the games begin!
     

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