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Underdriven accessory pullies for sr?

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  • Underdriven accessory pullies for sr?

    All I can find are ud crank pullies but I only want ps and maybe h2o.

    Anyone know of any?

  • #2
    did you even try google?
    I am SKULLWORKS

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    • #3
      Yes, and I never saw that
      Last edited by jfryjfry; 04-04-2013, 01:32 PM.

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      • #4
        The Stance water pump pulley is the default one to use: it prevents the water pump from cavitating at high RPMs while decreasing the load on the crank.

        The Circuit Sports link above is a knock off of the Greddy pulley set, which I happen to have. You can also purchase Megan knock offs.

        There is an underdrive crank pulley that can be purchased but it has no internal damping and therefore represents a risk to engine durability so I wouldn't suggest using it. I use an ATI damper, because it is the right way to do things.

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        • #5
          I like underdriving the crank because it's the wrong way to do things...


          Not really, our crank's 2nd harmonic is higher than the engine can rev, so it's fine.


          The Stance waterpump pulley is readily available, but there have been some others over the years that also underdrive it. Never seen an underdrive PS pulley by itself.

          The GReddy and knockoff pulleys are stock sized.
          '18 Chevrolet Volt - Electric fun hatch for DD duty!


          DefSport Koni Sleeve and Spring Perch Buy!!!
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          • #6
            I'm running the Touge Factory (stance) accessory pulleys simply because they come in black. They can be found at http://www.tougefactory.com
            Chicago Region SCCA SM # 688 http://www.scca-chicago.com
            TSSCC SM # 688 http://www.tsscc.org

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            • #7
              Originally posted by Tower240sx View Post

              Turns out you were as successful as I - that isn't an underdriven set. Perhaps you can use your google Jedi powers further and succeed where I have failed.

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              • #8
                Originally posted by jfryjfry View Post
                Turns out you were as successful as I - that isn't an underdriven set. Perhaps you can use your google Jedi powers further and succeed where I have failed.
                Tower is too busy being an arse to notice when he's wrong.
                '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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                • #9
                  FUUUUUC* I hate when that happens, I IGNORANTLY ASSumed that any pulley set would be under-driven....I forgot about ricer trendy bs...my bad I shall go cry now
                  I am SKULLWORKS

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                  • #10
                    I've got a knockoff set of those things I'm going to use. They actually weigh quite a bit less than the stock pulleys. Not a big deal, but I think they were like $30 shipped. The price they go for now is ridiculous... I also wanted a stock sized WP pulley in case the WP is too underdriven with the ~25% from the crank pulley and 10% from my oversized WP pulley.
                    '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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                    • #11
                      How will you know?
                      ~1992 240SX, SR20/Koni track day car
                      ~2016 M3, daily driver

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                      • #12
                        Figured coolant temps would be high.

                        It's a fine line between getting enough coolant flow, and cavitating with the crappy stock SR pump. I'd like to mod the pump, but who knows if it'll increase flow. Hard to say without at least some data.
                        '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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                        • #13
                          Call me crazy, but I've run stock, and underdriven water pump pullies, and didn't see any difference in temp on track. I thought it was just me so I swapped them out mid day and honestly didn't see a difference worth buying them over. Sold both pullies I had and called it a day.
                          'Slicks on a car show me you care - broken axles show me you're trying'
                          [I]Nitrous Rental Cars - Turbo Festivas - Vehicular Lunacy[/I]
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                          • #14
                            My temps went down with the under drive pulley and no other changes. Basically gave me another 5 mins at full tilt before hitting about 215 where I usually throw in a cool down lap.
                            '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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                            • #15
                              Just to rub salt in the wounds.....

                              I have a stock crank pulley, and some random WP pulley (no ducting what so ever and an old Greddy radiator) and with E85 on track I haven't seen over ~180 water temp, at the last track day it was ~85 ambient and the car wouldn't get over 194 at idle...fans come on at 200 off at 190.
                              I am SKULLWORKS

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