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    Re: ST4 Based Buggy Up & Running
    #11
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    Can you give some details on how you upgraded the steering? What rack did you use?
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    Re: ST4 Based Buggy Up & Running
    #12
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    Quote Originally Posted by Darcar Peru View Post
    Can you give some details on how you upgraded the steering? What rack did you use?
    Mine is essentially this rack:

    http://protodie.com/Steering-Rack-End-Load_p_72.html


    I'd recommend fabbing very solid braced mounts to the chassis with no less than 5mm plate as the steering takes a pounding but this rack has taken a heavy beating so far with 30"wheels no problems.

    If you mount it high with the original ST4 inner mount points you will keep no bump steer, just check your upper A-arm design for the fit of the steering bars throughout the travel.

    A more recent vid, have done a lot of work recently but no videos.

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    Re: ST4 Based Buggy Up & Running
    #13
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    Another ST4 video for anyone interested, its been running great but have a bit of an issue with CV's shearing at the start of the inner spline. Assuming it's just torque unless anyone has seen this before? Was going to look at some chromoly axles as the next step.

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    Re: ST4 Based Buggy Up & Running
    #14
    Senior Member jimmyg's Avatar
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    Nice. Even got a free shower near the end.

    Ej33 is going to hurt axles every chance they get. Torque for days.
    All dressed up and waiting for the beer to arrive.
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    Re: ST4 Based Buggy Up & Running
    #15
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    You are probably going to have to go with the same high grade axles that are used in the Class 10 or larger cars... I also kept thinking about how your rear arms are bending, now that you mention the broken CV's, are you sure there isn't a binding or contact issues during the bottom portion of the arm travel? Running out of shock length when the tire compresses? Just thinking out loud, wonderful build!!
    Marine Veteran Sgt USMC 8151/8541 1992-2000
    Process Improvement Specialist Miller Electric MFG LLC
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    Re: ST4 Based Buggy Up & Running
    #16
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    Quote Originally Posted by kustomfab2003 View Post
    You are probably going to have to go with the same high grade axles that are used in the Class 10 or larger cars... I also kept thinking about how your rear arms are bending, now that you mention the broken CV's, are you sure there isn't a binding or contact issues during the bottom portion of the arm travel? Running out of shock length when the tire compresses? Just thinking out loud, wonderful build!!
    I've got the rear arms strapped otherwise the CV is the limiting component followed closely by the shock. The brand name subaru CV's have tons of travel, I think I read on here somewhere 25 degrees which I think is at least accurate as they definitely don't bind, chinese copies bind at about 20 degrees but are made out of crap material. I've only busted one brand-name subi CV shaft which lasted probably 8 hours runtime but I want to start long course rallies so even that won't really cut it. So far I've not had an aftermarket axle shaft of any brand last longer than a couple of hours, they are a fairly cheap consumable but it's time to fix it.

    I designed the arms with four individual beams and fixed the lower two with some plate at the perfect position, at full acceleration there is still a small amount of twist in the design allowed by the upper arms not being fixed. I had a good look at this on take off but I'm in two minds because I think this slight twisting could be cushioning some of the forces on the joints which seems more likely to be beneficial.

    I think I might use an old axle, pull the boots off and completely run the whole system through its travel to double check next time, I guess its the only way to really know its not binding at any stage. If its all good maybe add a bolt-on braces to the upper arm and then hit the chromo axles. I could go lightweight wheel-sets as an option as well I guess...

    Thanks fellas!
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    Re: ST4 Based Buggy Up & Running
    #17
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    Thanks for the update. We can try to help as much as our keyboards and info will allow, LOL.
    Marine Veteran Sgt USMC 8151/8541 1992-2000
    Process Improvement Specialist Miller Electric MFG LLC
    CWI CWS CWE
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