Close



Results 1 to 8 of 8

Thread: Spring Rate

  1. #1

    Default Spring Rate

    Are the 93GT front spring rate heavier then 79 base.
    Thanks,
    Ed

  2. #2
    FEP Super Member gr79's Avatar
    Join Date
    Jun 2009
    Location
    SE Michigan
    Posts
    5,141

    Default

    According to a book i have:

    1979 base non V8= 370# constant rate
    1993 handling/GT/hd= 425-530 variable rate

  3. #3
    FEP Power Member mcb82gt's Avatar
    Join Date
    Jan 2004
    Location
    Olathe, Kansas
    Posts
    2,108

    Default

    Quote Originally Posted by gr79 View Post
    According to a book i have:

    1979 base non V8= 370# constant rate
    1993 handling/GT/hd= 425-530 variable rate
    That seems light, must be the rear spring numbers?
    Mike

    Now stang-less.

    88 Cougar 5.0

  4. #4
    FEP Super Member erratic50's Avatar
    Join Date
    Dec 2016
    Location
    Nebraska
    Posts
    4,575

    Default

    93 front spring rate is accurate. I don't know on the 79. I believe they had less rate but were constant so more harsh which aligns with what is mentioned above .

  5. #5
    FEP Power Member mcb82gt's Avatar
    Join Date
    Jan 2004
    Location
    Olathe, Kansas
    Posts
    2,108

    Default

    I had a brain malfunction and was thinking load rating. Sorry LOL
    Mike

    Now stang-less.

    88 Cougar 5.0

  6. #6

    Default

    Found this




    heres a list of common springs and their rates...

    Rate(lb/in) Drop(in.)
    PartNo. front rear front rear
    '87 Mustang 2.3L 370 160
    '87-93 Mustang 5.0 425-530 200-300
    '93 Mustang Cobra 425-530 160
    '93 Mustang Cobra R 750-850 240-260
    '94-95 Mustang Cobra 400 160
    '95 SVT Cobra R M-5310-R58 700 850
    M-5560-R58 200-260
    '96-98 Mustang Cobra 400-505 165-265
    '99-04 Mustang V6 OEM 400 190
    '99-04 Mustang GT OEM 450 210
    2000 SVT Cobra R (Eibach) M-5310-R00 800
    M-5560-R00 750 (IRS)
    2001 SVT Cobra OE M 500 470 (IRS)
    2001 Bullitt 1R3Z-5310-CA (front) 600
    1R3Z-5560-AA (rear) 250 0.75 0.75 1R3C-5560-AA ?
    2003 Mach 1 3R3Z-5310-AA (front) 600 3R33-5310-CA, 3R33-5310-AA ?
    3R3Z-5560-AA (rear) 250 0.50 0.50 3R33-5560-BB
    2003 SVT Cobra (Conv.) OEM 500 470 (IRS)
    2003 SVT Cobra Coupe OEM 600 600 (IRS)
    BBK Progressive BBK2510 ?? ?? 1 0.8
    Dech Speeddrive 1000-1200 210-280 1.5"
    Eibach Prokit 425-530 200-300 1.50 1.50
    Eibach ProKit Convertible 460-570 170-310 1.5 1.5
    Eibach ProKit Coupe 460-570 200-250 1.50 1.50
    Eibach Racekit 700-850 200-260
    Eibach Sportline 425-630 140-295 2.00 2.00
    Ford Motorsports B M-5300-B 425-530 200-300 1.50 0.75
    Ford Motorsports C M-5300-C 650 200-300 1.50 0.75
    Ford Motorsports F M-5300-F 460-570 200-250 1.50 1.50
    Ford Motorsports G (Conv.) M-5300-G 460-570 170-310 1.50 1.50
    Ford Motorsports R M-5300-R 700-850 200-260
    Global West 800 160 1 1
    Global West Comp 1000 160 1 1
    Global West Drag 680 160 1 1
    H&R Cobra Convertible Race 750-850 770 (IRS)
    H&R Cobra Coupe 700-760 685 (IRS)
    H&R Cobra Vert Super Sport 700-760 685 (IRS)
    H&R Race 750-850 260-280 1.25 1.00
    H&R Sport 490-575 250-285 1.60 1.50
    H&R Super Race 950-1050 260-300 1.25 1.25
    H&R Super Sport Coupe 51652-77 700-760 275-300 1.75 1.60
    H&R Super Sports Vert 51658-77 700-760? 275-300? 2 1.6
    Intrax 2 2
    Jamex 450-550 170-220 1.5 1.5
    Jamex Sportsprings 425-450 180-225 1.50 1.50
    Kenny Brown 650 800 (IRS) 2 1.25
    MAC Progressives 450-520 200-230
    MRT MRT-301 650 200-250 1.25 1.25
    Progress 580 250-300 1.75 1.75
    Saleen (Eibach ProKit?) 460-570 200-250
    Roush Sport SM01-37X0-V8 1.50 0.80
    Steeda Competition 555-8240 750-850 250 1.25 1.25
    Steeda Full Comp [front] 121-4540-001 850-1050 N/A 1.50 N/A
    Steeda Sport 223-9004 650 200-250 1.25 1.25
    Suspension Tech Street 725 230
    Suspension Tech Comp 850 280
    Last edited by ThunderStruck; 05-31-2019 at 12:43 AM.

  7. #7
    Moderator wraithracing's Avatar
    Join Date
    Jun 2010
    Location
    Grand Junction, CO/RR TX
    Posts
    14,206

    Default

    That's awesome information!

    Thanks!
    ​Trey

    "I Don't build it hoping for your approval! I built it because it meets mine!"

    "I've spent most of my money on Mustangs, racing, and women... the rest I just wasted."

    Mustangs Past: Too many to remember!
    Current Mustangs:
    1969 Mach 1
    1979 Pace Car now 5.0/5 speed
    1982 GT Stalled RestoModification
    1984 SVO Still Waiting Restoration
    1986 GT Under going Wide Body Conversion Currently

    Current Capris:
    1981 Capri Roller
    1981 Capri Black Magic Roller Basket Case
    1982 Capri RS 5.0/4spd T-top Full Restoration Stalled in TX
    1984 Capri RS T-top Roller
    1983-84 Gloy Racing Trans Am/IMSA Body Parts

  8. #8

    Default

    That list is mostly meaningless.

    You can compare two springs against each other which are linear, but for the most part you can't compare a progressive spring to another progressive spring, or for that matter a progressive spring to a linear one.

    1) Every company in that list uses different criteria to define the points at which the high and low rates are defined for their low and high spring rates. For example H&R uses ride height for the low rate and 2" of bump travel as the high rate. Eibach uses full droop travel as the low rate and ride height as the high rate.

    2) In addition, every company uses a different front and rear spring load to define ride height. With progressive springs this makes it impossible to compare springs between manufacturers.
    Jack Hidley
    Maximum Motorsports Tech Support

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •