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Thread: Does this suspension make sense to you?

  1. #1
    Join Date
    May 2019
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    58

    Default Does this suspension make sense to you?

    Ok, I've got some specifics on the suspension setup on my 7.

    Front:
    260# springs, unknown dampers, .71" ARB

    Rear:
    90# springs (not progressive rate), Bilstein dampers, .45" adjustable ARB, set on the 2nd softest of 4 settings.

    Is a differential like that between front and rear springs normal on these cars? Seems to me the front is way too stiff with those springs and the bigger ARB, even accounting for the spring angle
    Last edited by Andy69; 07-15-2019 at 05:20 PM.

  2. #2
    Join Date
    Sep 2006
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    Default

    On my 2000 S3 Caterham, I think i have stock 200lb fronts and 150 rear with Stock Bilstein shocks. And the green bush front sway bar and the rear bar set to the stiffest setting. Handles like it's on rails.

    It is sprung softer than my Orange SV which was set up with Nitron Adjustible shocks and who knows what spring rates. probably a lot stiffer springs as it's got way less roll than the Yellow car.
    Mangia bene, Ridi spesso, Ama molto, Guidare veloce

    2000 Caterham Superlight #123
    1.8L VHPD Rover K Series
    2009 Caterham SV
    2.3L Cosworth Duratec

  3. #3
    Join Date
    Apr 2013
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    77

    Default

    Not to hijack your thread (ok I guess I am), but can anyone tell me how to determine my spring rates by visual inspection?
    1997 Caterham, BDA
    1991 Miata, supercharged
    2017 VW GTI

  4. #4
    Join Date
    May 2019
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    58

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    Quote Originally Posted by BlueBDA View Post
    Not to hijack your thread (ok I guess I am), but can anyone tell me how to determine my spring rates by visual inspection?
    I measured the length, diameter, number of active coils, and wire diameter and used an online spring calculator. The one variable that I couldnít get was the type of wire which didnít make a huge difference in the end result


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  5. #5
    Join Date
    May 2019
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    Default

    Quote Originally Posted by yellowss7 View Post
    On my 2000 S3 Caterham, I think i have stock 200lb fronts and 150 rear with Stock Bilstein shocks. And the green bush front sway bar and the rear bar set to the stiffest setting. Handles like it's on rails.

    It is sprung softer than my Orange SV which was set up with Nitron Adjustible shocks and who knows what spring rates. probably a lot stiffer springs as it's got way less roll than the Yellow car.
    If I did my calculations right it sounds like someone set this car up to be soft and comfortable in the rear and handle well enough for fun on winding roads but not for any kind of track use.

    Looks like a set of good coil overs should fix the issue


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  6. #6
    Join Date
    May 2019
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    Default

    Well ok, like a dummy I shot off my mouth prematurely. I didnít think to lift the car up and take the weight off the springs before measuring :clonk: and I also counted the non active coils.

    Fronts 350#
    Rear 180#

    ARBs look to be the biggest available from Caterham.

    So, it still seems there is too much front roll resistance. Iím going to order some 170# springs for the front and see what that does.


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  7. #7
    Join Date
    Feb 2009
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    NYC
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    350lbs on the front? OMG!

    You use that in a car 3 times plus the weight...
    Mike
    2010 Caterham CSR with Cosworth 2.3 Duratec
    2018 Caterham 420R with 2L Duratec 210hp at Donington UK
    1975 BMW CSL Group 4 (restoration - engine and dry sump install time)
    1977 Holden Torana "A9X" (awaiting restoration)
    1985 Holden Commodore Group A (restoration - engine rebuild)
    1982 Ferrari 400i (will repaint to original color in 2020)
    1965 Ford Mustang Fastback "Holman Moody"
    1992 Ford Escort RS Cosworth WRC (fettling after long period of storage)
    1990 Range Rover 2 door Classic

  8. #8
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    May 2019
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    Quote Originally Posted by Croc View Post
    350lbs on the front? OMG!

    You use that in a car 3 times plus the weight...
    I keep thinking I must have measured that wrong but I double and triple checked.

    It would certainly explain the ridiculous understeer.


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  9. #9
    Join Date
    Sep 2006
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    Andy, I just saw that you have a K series in your car. That engine is really light and the lighter springs would definitely be more appropriate to your car. My K series car seems tightly sprung on normal road driving, but on track it handles beautifully with a bit of roll that transmits excellent feel.

    Tom
    Mangia bene, Ridi spesso, Ama molto, Guidare veloce

    2000 Caterham Superlight #123
    1.8L VHPD Rover K Series
    2009 Caterham SV
    2.3L Cosworth Duratec

  10. #10
    Join Date
    May 2019
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    Default

    Quote Originally Posted by yellowss7 View Post
    Andy, I just saw that you have a K series in your car. That engine is really light and the lighter springs would definitely be more appropriate to your car. My K series car seems tightly sprung on normal road driving, but on track it handles beautifully with a bit of roll that transmits excellent feel.

    Tom
    Iíve been emailing with Simon from Meteor about what to do about the springs/dampers. Should get it straightened out in short order.

    Itís a bit baffling to me that the springs are so stiff in the front. I keep thinking I measured them wrong, but it does understeer A LOT - worse than my compact GM totally stock 4 door sedan did.


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