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S15 Vicous & Helical

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  • S15 Vicous & Helical

    how can you test a s15 diff to check if its a VLSD OR Helical?
    - Hong

  • #2
    With it installed? Jack the rear and rotate the tires. Helical = tires rotate OPPOSITE each other

    VLSD = tires rotate with each other

    The bad thing is an open diff will also rotate the wheels opposite each other.

    BTW - did the S15 ever come with a VLSD? I don't think it did?

    If you look at the diff with the cover off, it's very obvious which is which.
    '18 Chevrolet Volt - Electric fun hatch for DD duty!


    DefSport Koni Sleeve and Spring Perch Buy!!!
    http://www.nissanroadracing.com/showthread.php?t=5902

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    • #3
      Only the Spec R S15 came with the HLSD.
      98 240sx w/ S15 SR20DET, TD06 20g, FMIC, 3in exhuast, walbro, EBC,

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      • #4
        Originally posted by Def View Post
        With it installed? Jack the rear and rotate the tires. Helical = tires rotate OPPOSITE each other

        VLSD = tires rotate with each other

        The bad thing is an open diff will also rotate the wheels opposite each other.

        BTW - did the S15 ever come with a VLSD? I don't think it did?

        If you look at the diff with the cover off, it's very obvious which is which.
        yeah they came with a VLSD and Helical. Some guy is going to show me one, but hes unsure. He has a s15 6 speed trans so makes me think its a spec r helical. Pumpkin looks like an s15 but the back cover has 4 bolts like an s13's.... and its not installed so could i just spin the output shaft and it'll be the same as if it was installed? Also if i took off the cover what would i look for? Besides the ring and pinion?


        Originally posted by tom n View Post
        Only the Spec R S15 came with the HLSD.
        yessir.
        - Hong

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        • #5

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          • #6
            yeah i didnt understand it at first, they looked the same
            but further inspection
            now i know how different they are...

            open has spider gears
            VLSD is closed with holes
            and helical has that tetris L groove.

            Thanks guys, hopefully this guy has it when i open up the diff.
            - Hong

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            • #7
              Yep, it's super easy to look at it and see what it is when you open the case.
              '18 Chevrolet Volt - Electric fun hatch for DD duty!


              DefSport Koni Sleeve and Spring Perch Buy!!!
              http://www.nissanroadracing.com/showthread.php?t=5902

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              • #8
                I keep over thinking things, hopefully its the deal of the century and it is a helical!

                Thanks guys you da best.
                - Hong

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