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    Re: Ford powered ST4 based buggy
    Senior Member dangeranger93's Avatar
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    I have that one saved for once I get my measurements, I sent an email to walker evans to see if they will tell me what springs I have now

    I mocked up my new front arms last night and with my new coil over mount location I am going to need new uppers as well,
    Does anyone know a good place to get tube in the Cincinnati area? I'm getting quoted at $7 a foot for 1" .120 DOM
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    Re: Ford powered ST4 based buggy
    Keeper of the Asylum K-fab's Avatar
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    Quote Originally Posted by dangeranger93 View Post
    I have that one saved for once I get my measurements, I sent an email to walker evans to see if they will tell me what springs I have now

    I mocked up my new front arms last night and with my new coil over mount location I am going to need new uppers as well,
    Does anyone know a good place to get tube in the Cincinnati area? I'm getting quoted at $7 a foot for 1" .120 DOM
    Crap... I can't recall who I used for tubing.

    I got a lot of my materials from Metal Supermarkets over on 747 just west of Muhlhauser drive.

    Tell Carston I (Richard from K-fab) said hello.

    Metal Supermarkets
    4766 Dues Dr, Cincinnati, OH 45246
    (513) 942-8222


    Hit up Jason at JSC Powder coating and ask him if he knows where to get material (tell him I said hi):

    1517 OH-28, Loveland, OH 45140
    jscpowdercoating.weebly.com
    (513) 806-6810

    To rate an unknown spring:
    11,500,000 x wire diameter to the 4th power
    ---------------------------------------------------
    8x(spring ID + wire diameter) cubed x active coils

    example:
    wire diam .362; Spring ID 2.575; active coils 9.2

    11,500,000 x (.362)^4
    -----------------------------
    8 x (2.575+.362)^3 x 9.2

    Your rate is 105.9
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    Re: Ford powered ST4 based buggy
    Senior Member dangeranger93's Avatar
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    Metal supermarkets told me $167 for 20 feet which is mighty high for 1". Alro told me about the same. American metal supply told me 3.20 a foot but they cant allow me in until after corona. I found Industrial tube and steel at 4.84 a foot which lines up with what I paid last time so I just did it to have it now.

    I will attempt to measure my springs so I have an idea what I have
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    Re: Ford powered ST4 based buggy
    Senior Member kustomfab2003's Avatar
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    I have been ordering my DOM from StockCarSteel on ebay... All the local guys are way to high. I used 1-1/4 .120 for my suspension stuff, here's the link. It's a combo pack of 3 - 4ft sections. Still cheaper then local.
    https://www.ebay.com/itm/DOM-Carbon-...72.m2749.l2649
    Marine Veteran Sgt USMC 8151/8541 1992-2000
    Process Improvement Specialist Miller Electric MFG LLC
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    Re: Ford powered ST4 based buggy
    Senior Member dangeranger93's Avatar
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    I use stock car steel for a lot of my small order stuff but i like getting full lengths when i can

    Sent from my SAMSUNG-SM-G935A using Tapatalk
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    Re: Ford powered ST4 based buggy
    Senior Member kustomfab2003's Avatar
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    I understand completely. If I were doing the whole chassis then it is 10ft at a minimum lengths. For suspension, the 4ft seems to work out ok with minimal loss. Good luck.
    Marine Veteran Sgt USMC 8151/8541 1992-2000
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    Re: Ford powered ST4 based buggy
    Senior Member dangeranger93's Avatar
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    When I built the chassis i got all 20 foot lengths, I now have one 5 foot piece left haha I agree the 4 footers are probably fine for suspension, I think I got 8 foot pieces when I did the suspension the first 2 times, I really hope I'm done with control arms for a while now
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    Re: Ford powered ST4 based buggy
    Senior Member dangeranger93's Avatar
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    Ok I'm trying to determine my current spring rates, i have my coil wire diameters, spring id nd od but active coils has me a bit confused here are pictures of my front and real coil overs who can tell me how many active coils these 4 springs have


    Also does anyone know or have access to stock RZR spring rates? The internet says for a 4 seater Fronts are 280 tender and 335 main, Rears are 160 tender and 270 main.
    I have only found tender numbers for 2 seaters which are Front 165 and Rear 100

    My setup came off of a 2015 xp 1000 high lifter 2 seater, I dont know if the high lifter springs are different I did see one guy say a 2 seat highlifter uses 4 seat springs







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    Re: Ford powered ST4 based buggy
    Senior Member dangeranger93's Avatar
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    I’m starting to believe the internet numbers for 4 seat springs on my 2 seat high lifter shocks. Just going off pictures of my springs I think these coil numbers make sense, someone correct me if I’m wrong
    For front tender if I put 2.75 active coils I get the 280 spring rate that the internet says
    Front main 6.5 active coils gets me 330 which is close to the internets 335
    Rear tender 5 coils gets 165 which is close to the internets 160
    Rear main 7.5 coils gets me 264 which is close to the internets 270

    So with those numbers it puts my combined spring rates at 152 front and 100 rear
    My rear tender is completely coil bound and my front is close just sitting, I did change my front coil over mount location when I did the new arms which should change the spring rate, so none of my riding data from before will work now it was way to soft before

    Using the crawpedia calculator, I still need to take a front and rear shock apart to measure my wheel travel and droop ratio but I’m putting a few guesses in for now I also don’t know corner weight I know total weight is about 2000 and I’m going to put a few different ratios for a guess for now until I can figure out how to weigh it, if anyone in the Cincinnati/south east Indiana area has scales let me know.

    My highest and lowest front are: 136 and 338 so front could be close depending on the actual numbers
    Rear highest and lowest are way off haha 336 and 656, way more than 100

    Looks like I have some work ahead of me to figure this out, let me know if you guys think I’m on the right track


    one more question sitting droop ratio is described as: Sitting Droop Ratio is the percentage of the shock shaft positioned inside the shock body at ride height.
    (For example, if you want 6" of shaft showing at ride height on a 14" coilover, that's 8" of shaft inside the shock: 8/14 = 57%)

    since my rear shocks are limited do i include the shaft that cant come out or pretend it its not there? I'll probably calculate both but not sure whats right
    Last edited by dangeranger93; 05-12-2020 at 03:31 PM.
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