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    Re: Ford powered ST4 based buggy
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    So I'm struggling with picking what springs to choose along with believing the numbers I got from the calculator, and conveniently any other calculator I can find is broken, If anyone has any input let me know
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    Re: Ford powered ST4 based buggy
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    I'm not of much help on spring selection as I am going thru the same issues... I do have a pretty good selection of 2.5 ID 10", 12" and 14" springs on hand so let me know if you come up with a rate you need... Prices will be super fair!
    Marine Veteran Sgt USMC 8151/8541 1992-2000
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    Re: Ford powered ST4 based buggy
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    That would be awesome but i need 3" ID

    Sent from my SAMSUNG-SM-G935A using Tapatalk
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    Re: Ford powered ST4 based buggy
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    Bummer, I didn't realize the RZR's were running 2.5" body shocks. Nice score!! I have Elka Stage 5's and I thought they were a 2.5" but turned out to be only a 2" (metric) bodied shock.
    Marine Veteran Sgt USMC 8151/8541 1992-2000
    Process Improvement Specialist Miller Electric MFG LLC
    CWI CWS CWE
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    Re: Ford powered ST4 based buggy
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    Yeah its pretty cool, except the $100 each springs

    Sent from my SAMSUNG-SM-G935A using Tapatalk
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    Re: Ford powered ST4 based buggy
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    Ok I am just going to talk through my spring issues and hopefully someone will chime in and tell me I'm on the right path or not.

    We will start with the rear, currently according to rzr forums my springs are 160 over 270 but the upper is in coil bind at ride height so I effectively only have a single 270. I know my rear end bottoms out very easy currently. I havent disassembled my entire suspension to determine my unsprung weight I did find my tire/ wheel combo is about 55 pounds and I saw some other internet posts where guys said a typical sand car is about 125 unsprung so I decided to use the crawlpedia calculator at 100 and 125 and Ill pick something in that range, The calculator came up with a spring rate of 347-364, so about 75-100lb more than my current "single" spring setup. now for math, I have about 5.25" of shock travel from ride height to bump that is 1417psi of spring keeping me from bottoming out. back to the new rate, I will need at least a 700lb lower spring to get close to the correct rate a 600 over 700 gets a 323 rate and has 2921psi at full bump (upper spring bumped at 2") thats about double what I have now. the 323 rate is about what crawpedia says If I had 150lb unsprung weight. I chose those springs because those are readily available rates, 700 is available in 16" and 18" (stock rzr is 17") and 600 is the highest rate available in 6 and 8 (stock rzr is 6.5). I was leaning towards a 18" lower and 6" upper, thats a half inch longer overall from stock but the 6" 600 is delayed through summit.

    Hopefully that makes sense to someone, I chose those rates due to availability and i read you dont really want more than a 150lb difference between springs. hopefully someone will chime in
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    Re: Ford powered ST4 based buggy
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    I think I figured out my issue Ive been measuring using my strapped length instead of overall, I thought if i wasnt using that length I could pretend it didnt exist, turns out it pretty much doubles my required spring rate. I did some math using my existing springs and came up with a new rate of 297, so a 250 over a 350 should be pretty close.

    my new question is my current spring lengths are 17 and 6.5, should i go with a 8 over 16 or a 6 over 18, im leaning toward 6 over 18 but figured I ask opinions
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    Re: Ford powered ST4 based buggy
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    Well the first race of the season was this weekend and things didn't go as planned. Mechanically things seem fine but I got all pumped up and on our hot lap I got out in the lead and took way to big of a jump way to fast and I think I tried to make myself a little shorter. I didn't even finish the lap, I just pulled off. I did go out and run the Feature but I slowed down and rolled every jump and it wasn't super comfortable. It has been confirmed that I need a new cooling system. the civic radiator and bigger fan just cant to it. it got way to hot with me just taking it easy so back to the drawing board. hopefully videos or pictures will surface and I can share them here
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    Re: Ford powered ST4 based buggy
    Keeper of the Asylum K-fab's Avatar
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    Dreaded adrenaline poisoning taking over the throttle pedal, eh?

    So too big of a jump too fast - I take it the landing was not good? Be careful with that - can cause back compression.

    So what about the suspension overall (other than the big jump)?
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    Re: Ford powered ST4 based buggy
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    I got out in front of a guy who had a pretty professional looking ecotec buggy and wanted to stay there so mistakes were made, I probably could have learned a few things following. Yeah it came down hard and nose down which I've been fighting since the start. I'm hoping i didn't compress anything, I'm feeling quite a bit better today so hopefully that keeps up. Other than that it felt pretty good, stable at high speeds, turning is ok, it likes to push and the open diff isn't helping with turning with the throttle. The front end feels more firm than before, I moved the coilover mount outward which basically means I don't need as heavy of a spring, it was soft before I think its pretty close now. The rear has about the same firmness feeling coming down as the front I just went with a 250 over 350 spring setup, I think I need to get crossover rings so the lower spring can help absorb the bigger jumps but no one has them in stock. I don't think I bent or broke anything so I'll probably just get crossovers and a new cooling system and leave it alone for the next race, which is at the end of July. I'm probably going to take a break and get my truck back on the road before I get into the buggy again

    Any advice is happily taken
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