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Thread: E31 coilovers?

  1. #26
    Join Date
    Nov 2013
    Location
    Indianapolis, IN
    Posts
    1,083
    My Cars
    97 850CI
    That is some good looking stuff.
    Desecrator of all things Sacred

  2. #27
    Join Date
    Dec 2013
    Location
    San Antonio
    Posts
    321
    My Cars
    850i, '76 2002, '76 530
    Ground Control just received my front E31 struts yesterday and will proceed with mods.

    Per Riley, with GC:

    To my knowledge our kit is all inclusive and will come equipped with rear ride height adjusters placed in board in the factory locations and converts to use with 2.50" I.D. springs.

    We shorten the front strut housings to gain ample suspension travel when lowered in the realm of 1.5-2.5 lower than stock. The strut cartridges, depending on the spring rate you should choose, would either be a 1547spgc, a propietary Koni we have made to our valving and length requirements, and a 1289spgc or a 1303spgc in the rear, also a proprietary Koni's we have made specifically to our valving and height specifications.


    Should you want to go aggressive on the spring rate and lean more into the race dampers, we also can accommodate such rates with an 8610-1437race front strut cartridge and a 1225spgc in the rear. These dampers can accommodate heavy spring rates and the heavy abuse of a race car when set up properly.


    All of our mounts are Ground Control Products, The camber plate I would suggest would be a Hybrid version of a race plate. It features all of the adjust-ability of a race camber caster plate, and still features a bearing for articulation. The two differences are a urethane spring hat, and instead of a cupped washer to carry the load of the vehicle a misalignment spacer that directs the load and the steering duties to the spherical bearing is used instead. This quiets down the NVH transfer through the chassis as well as delivers smooth and quiet steering inputs.

    Question from me in regard to spring rates the street/track kit can handle:

    The Koni SPGC struts I would put a cap on at 600lbs. The Koni Race struts I would put a cap at 850lbs. The SPGC shocks with an inboard mounted spring (assuming the motion ration is .5 to .6, I would recommend no more than 1500lbs or so. Being that they have are adjustable in the way or rebound damping, I would put the lower end of the strut range at a 300lb spring and the lower range of the shock around 400lbs on an inboard set up such as yours.



  3. #28
    Join Date
    Dec 2013
    Location
    San Antonio
    Posts
    321
    My Cars
    850i, '76 2002, '76 530
    Here is the complete quote:

    GCinvoice.jpg
    Attachment 624731
    Last edited by JDP530; 03-17-2018 at 07:38 PM.

  4. #29
    Join Date
    Oct 2008
    Location
    Mt. Dora, Florida
    Posts
    2,385
    My Cars
    Alpina B12 5.7
    Those look to be very well done. It will be interesting to find out what the ride is like with them.
    Alpina B12 5.7 #52
    Editor, E31 NEWS
    North America Representative, 8er.or Board of Directors



  5. #30
    Join Date
    Jun 2012
    Location
    Woodstock, GA
    Posts
    509
    My Cars
    2001 BMW 540i6
    So how did it go

  6. #31
    Join Date
    Dec 2013
    Location
    San Antonio
    Posts
    321
    My Cars
    850i, '76 2002, '76 530
    I just received suspension kit today from Ground Control. Everything looks great and items were well packed in bubble wrap. The only items not included were dust boots and a spanner for the adjustable rear spring perches.

    The rear Konis have the 'button' adjustment where button is located on top of shock body which may not be too difficult to adjust but wheel will need to be removed. I would prefer the click type at top of shock rod so you can adjust shocks from inside the trunk, but I dont know if those are available for the E31. Will have to wait til Monday to find out.

    GC also supplies their own shop-made rear upper shock mounts that look really strong and should compliment the reinforcement plates I have already installed.

    The front struts were shortened one inch if I am not mistaken and they added a heavy gusset between tube and axle housing. Adjustable camber plates are also included so I hope fitment is correct without having to make any mods.

    IMG_20180414_161815180.jpgIMG_20180414_161823295.jpgIMG_20180414_161856330.jpgIMG_20180414_161922374.jpgIMG_20180414_161929699.jpg

  7. #32
    Join Date
    Jun 2012
    Location
    Woodstock, GA
    Posts
    509
    My Cars
    2001 BMW 540i6
    Damn thatís pretty. Are the rear shock mount studs pressed in or is that an allen fitting?

  8. #33
    Join Date
    Jun 2011
    Location
    Dubai
    Posts
    97
    My Cars
    52/61 E31 Platinum,GT350
    Ground control setup is sweet!

  9. #34
    Join Date
    Dec 2013
    Location
    San Antonio
    Posts
    321
    My Cars
    850i, '76 2002, '76 530
    Quote Originally Posted by killian665 View Post
    Damn that’s pretty. Are the rear shock mount studs pressed in or is that an allen fitting?
    Rear upper mounts are allen or socket head bolts. I am not sure if they are long enough to accommodate the top reinforcement plates, if not, I can replace them. They also included spacers for the bottom eyelets so they fit into lower control arm.

  10. #35
    Join Date
    Dec 2006
    Location
    Sunny Cali,
    Posts
    8,431
    My Cars
    6.5 second 69 Camaro
    Nice, Would be interested in a front set, I mis the last run when Randy made these.

  11. #36
    Join Date
    Dec 2013
    Location
    San Antonio
    Posts
    321
    My Cars
    850i, '76 2002, '76 530
    I finally finished installing the front GC modified struts and plates. I have the car sitting about 1.5" lower than stock measuring apprx 25.5" from ground to top of fender opening. I have not installed the GC rear shocks and springs yet, but I have driven the car and it is pretty well balanced front to rear with the EDC shocks so the rears are probably good compared to the front EDC struts that were constantly bouncing down the road. Ride is quite firm but not jarring or harsh. Car is new to me so its hard for me to compare this new setup with anything else. Turn-in is crisp with -2.5 camber set up initially. Car was very smooth without any vibration up to 100mph. I am using the Moosehead Eng adjustable pillow balls on the lower (rear) control arms.

    IMG_20180428_154327054.jpg
    IMG_20180428_172433815.jpg
    IMG_20180430_210224173.jpg
    IMG_20180501_163758686_HDR.jpg
    IMG_20180501_175501690.jpg
    Last edited by JDP530; 05-04-2018 at 03:36 PM.

  12. #37
    Join Date
    Dec 2013
    Location
    San Antonio
    Posts
    321
    My Cars
    850i, '76 2002, '76 530

  13. #38
    Join Date
    Apr 2017
    Location
    Ft. Lauderdale FL
    Posts
    44
    My Cars
    2012 Alpina B7
    I sometimes look for the "Like" button on forums....

  14. #39
    Join Date
    Dec 2013
    Location
    San Antonio
    Posts
    321
    My Cars
    850i, '76 2002, '76 530
    Quote Originally Posted by beanerbmw View Post
    I sometimes look for the "Like" button on forums....
    Me too! Where is it? I still haven't found it.

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