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    Last track night of the year

    Made some adjustments to the suspension, corner weights, and alignment, and dropped about 4-5 seconds per lap.

    https://youtu.be/my71Btr_XgM


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    OK, an update. Some previous owner replaced the...

    OK, an update. Some previous owner replaced the stock front springs with 260# springs. I dropped them back down to 175, adjusted the ride height. Handling was much better and I was about 2 seconds...
  3. What the heck? Canít move the lower spring perch

    Stock Bilstein dampers on a 1992 Supersport. Tried to adjust the ride height in the rear, left rear perch wonít budge. Iím thinking differential metals corrosion. Have it soaking in PB Blaster now....
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    Iíve been emailing with Simon from Meteor about...

    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...
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    Engine serial number decode

    Yes that answers most of my questions. Thank you.

    And at the same time confuses me as to my particular car.

    The title says 1992, and the chassis year (N) matches.

    But the engine is a...
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    Engine serial number decode

    So I get the impression that Caterham used its own engine serial numbering for the data plate. Is there any way to decode this? Examples I've seen have the form of KD-XXXXX-XX with the last two...
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    Is that at the wheels? If so thatís pretty...

    Is that at the wheels?

    If so thatís pretty good for a normally aspirated 2.0


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    I keep thinking I must have measured that wrong...

    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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    Well ok, like a dummy I shot off my mouth...

    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.
    ...
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    If I did my calculations right it sounds like...

    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.
    ...
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    I measured the length, diameter, number of active...

    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...
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    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,...
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    Weíve got SCCA autocross and track days, plus a...

    Weíve got SCCA autocross and track days, plus a NASA region that has club racing. Jackson has a small but dedicated club that holds autocross events at Jackson Dragway.

    Lots of stuff going on. ...
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    Iím right in town. Takes me about 20 minutes to...

    Iím right in town. Takes me about 20 minutes to get to MIR.


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    Track day in Memphis

    Had my 7 out for Track Night in America yesterday for the first time. What a blast that car is to drive on the track. It was a TON of work to drive though. I'm much more tired than when I track...
  16. Iím 6í1Ē 255 and that guy makes me look smalll ...

    Iím 6í1Ē 255 and that guy makes me look smalll


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    Iíll take another look at that. I had seen some...

    Iíll take another look at that. I had seen some online but didnít recognize them on the car


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  18. I never understood why car makers make a limited...

    I never understood why car makers make a limited run of a popular car like this. All theyíre doing is leaving a million bucks per car on the table for the purchaser to have when he sells it two...
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    At some point you end up with a spring that is...

    At some point you end up with a spring that is essentially an infinite spring rate, in that there isn't enough weight in the car for it to compress against. Still, people run upwards of 1000# springs...
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    I think all major manufacturers do that. Perhaps...

    I think all major manufacturers do that. Perhaps these have been refinished at some point.


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    I think I can get a good first kick at the cat by...

    I think I can get a good first kick at the cat by using an online spring rate calculator and taking a few measurements. That should tell me if I'm somewhere close to stock. I think the suspension...
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    They are designed to transfer weight laterally,...

    They are designed to transfer weight laterally, so yep.

    I use a setup with 8 bathroom scales, two at each wheel, and a length of 2x12 that that wheels sit on. There is enough space to roll the...
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    What spring rates do I have?

    Dumb question, I know. But none of the springs currently on the car have any information on them. Fronts are red, rears are yellow. Dampers are gold. Other than that, I have no idea without...
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    The first step is to model the suspension. I...

    The first step is to model the suspension. I have a spreadsheet I use that I got from USRT.com. There are online calculators you can buy for a period of time that are quite reasonable. I usually...
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    ugh. Makes me glad to live in TN. When I went...

    ugh. Makes me glad to live in TN.

    When I went to the DMV with my title, they ASKED ME if the title matched the VIN plate, and then I paid the $32 registration fee for a classic car, which is good...
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