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  • Exedy HyperSingle torque capacity

    I've searched and can't really find any good info on how much power an Exedy HyperSingle SR clutch can hold torque wise. I'd like to get a clutch that can comfortably hold 350-360 ft-lbs at the wheels.


    Some say the Hypersingle can easily do it, others say it slips at lower torque (power) levels.



    The other alternative is a 6 puck sprung ACT disk with an ACT HD PP and Toda flywheel, which I think can hold that torque without an issue.


    The other thing is the Exedy was a bit heavier than I was expecting at about 35 lbs for the total assembly. I need to take apart the old motor to see what the ACT + Toda assembly weighs.
    '18 Chevrolet Volt - Electric fun hatch for DD duty!


    DefSport Koni Sleeve and Spring Perch Buy!!!
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  • #2
    It's a KA, but I have an Exedy and ACT setup sitting on the garage floor. I'll weigh it tomorrow if you want.
    Originally posted by SoSideways
    I don't care what color they are as long as they are LONG AND HARD.
    '04 G35 Sedan 6MT- The DD
    '96 240SX- The Track Toy

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    • #3
      Buy a tilton, less money, more upgradability, more availability.

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      • #4
        Originally posted by Matt93SE View Post
        It's a KA, but I have an Exedy and ACT setup sitting on the garage floor. I'll weigh it tomorrow if you want.
        I think the main difference would be the 225 vs. 240 mm thing.

        I know the Toda flywheel is 10.5 lbs, so that leaves 24.5 lbs of the ACT PP and disk. I don't remember it being that heavy, but I could be wrong. Rotational inertia would still be higher on the 240 mm one at the same weight with all things equal, but I'll just go by weights for now.
        '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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        • #5
          Originally posted by Z28ricer View Post
          Buy a tilton, less money, more upgradability, more availability.
          Any 7.25" clutches for an SR that don't cost an arm and a leg. Most of the smaller than regular sized stuff seems to be $$$$$$.
          '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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          • #6
            Originally posted by Def View Post
            Any 7.25" clutches for an SR that don't cost an arm and a leg. Most of the smaller than regular sized stuff seems to be $$$$$$.
            Last i checked its around the same price as the exedy hyper.

            Fidanza makes the flywheel 143207

            $370 http://sdparts.com/details/fidanza-e...corp/fid143207

            Tilton metallic only disc

            Tilton Cerametallic disc $136
            http://www.spruellmotorsport.com/til...an-p-3381.html

            Tilton OTII cerametallic clutch assy $479
            http://www.hrpworld.com/index.cfm?tp...action=product

            Tilton lists them up to 420 ft lbs for the single cerametallic, though thats with a really high ratio spring i'd probably try to keep it to the minimum on the spring for what you're doing, or even consider the twin setup.

            Heres the page for tilton on what plates do what http://www.tiltonracing.com/content....st2&id=379&m=d

            Ratings for the twin plates http://www.tiltonracing.com/content....st2&id=380&m=d

            These guys have a more reasonable price on the plate at $380

            http://www.spruellmotorsport.com/clu...ng-p-2210.html

            Thats for single cerametallic

            metallic ones here:

            http://www.tiltonracing.com/content....st2&id=389&m=d


            Theres an older nissan TOB i'd search out for use with one of those setups, it has a smaller contact circle to work with the required smaller area, if you want to skip going to a hyd tob setup.

            So $800~ roughly for the single setup from tilton, in cerametallic, even if you did a hyd tob you could keep it to the same price as the exedy, with improved serviceability and less weight.

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            • #7
              Exedy's product catalog lists a torque capacity of 350lb/ft for the hyper single so its probably going to be borderline for your setup...

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              • #8
                Heres the p/n listed for the use with oguras 8.5" single metallic plate clutch, i'd either go with this, or the hyd tob route and the tilton setup, whichever plate count and type you want.

                30502-14601

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                • #9
                  http://store.trgparts.com/725-ot-ii-...ing-p6717.aspx

                  2 plate cerametallic rated for 400 ft lbs $595

                  Disc pack http://www.summitracing.com/parts/TIL-641852AA33/

                  $187

                  $1160 for the Tilton twin disc clutch, clutch disc set, and fidanza flywheel.

                  Wee, $100 extra for the far better setup.

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                  • #10
                    Nice. Competition Clutch makes a twin disc in that price range with several available pressure plates.
                    ~1992 240SX, SR20/Koni track day car
                    ~2016 M3, daily driver

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                    • #11
                      Originally posted by Z28ricer View Post
                      http://store.trgparts.com/725-ot-ii-...ing-p6717.aspx

                      2 plate cerametallic rated for 400 ft lbs $595

                      Disc pack http://www.summitracing.com/parts/TIL-641852AA33/

                      $187

                      $1160 for the Tilton twin disc clutch, clutch disc set, and fidanza flywheel.

                      Wee, $100 extra for the far better setup.
                      I've driven a buddy's E36 M3 with an auto flexplate and a 5.5" triple disk - it pretty much sucks to start off in the thing. I think the whole assembly is in the 14 lb range and the flexplate doesn't have much inertia at all.

                      I wouldn't mind a more responsive setup than my current Toda flywheel and ACT 240mm clutch. It revs up ok, but it does seem to have a bit more inertia than it needs. I realize a little more inertia is needed for ceramic clutches since there isn't any slip. But just as a datapoint I could stand for less inertia.


                      The thing that concerns me with this talk of Tilton clutches is it seems the wear limit on these disks is almost nothing, like 0.020-0.030" total, which you could easily do in a few thousand street miles.

                      Not that I take this thing in rush hour traffic all the time, but it's nice to be able to drive it on the street for street tuning or bedding brakes, or just driving to and from the track.
                      '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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                      • #12
                        They list that as the wear limit yes, but they also list them as "very wear resistant"

                        Also note that half of the jdm clutches just use the full on metallic discs, i've driven the ogura 409 plenty on the street, similar wear listing, it lasted quite a while, and wasnt very bad to drive.

                        A 5.5 on a button fly with flexplate is going to weigh a good deal less than fidanza's aluminum flywheel, its normal size, just drilled and smaller friction plate to match the 7.25, having driven the 8.5 metallic, I'm sure the 7.25 cerametallic would be great.


                        There are people who say a metallic small clutch like that will never last on the street for a day, and is impossible to start off with, yet there are guys who drive them every day in daily drivers.

                        Cant even find a listing for exedy's wear, maybe they just dont want to scare you with the same numbers.

                        Theres another brand of 7.25's that uses thicker discs if you are really set on it, just finding pricing seemed to be a little harder when I was looking, heres the link

                        http://www.powertraintech.com/

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                        • #13
                          Was looking through a Racecar Engineering and saw a Quartermaster ad for a Rally line of clutches with .250" thick disks for more friction material. That might be a good way to go.


                          The only thing is I'm not really looking to spend $1100 on a clutch... I have both the Exedy Hypersingle and ACT HD + relatively new 6 puck disk (which doesn't have much wear limit either, but lasts quite a while in my experience). I know the ACT HD + 6 puck will hold the power I'm looking for, but it's a big clutch.

                          I figure for $1100 I'd be most of the way towards a 450-500 rwhp turbo setup... which would be more of a blast than a new clutch.
                          '18 Chevrolet Volt - Electric fun hatch for DD duty!


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

                          Comment


                          • #14
                            Originally posted by Def View Post
                            Was looking through a Racecar Engineering and saw a Quartermaster ad for a Rally line of clutches with .250" thick disks for more friction material. That might be a good way to go.


                            The only thing is I'm not really looking to spend $1100 on a clutch... I have both the Exedy Hypersingle and ACT HD + relatively new 6 puck disk (which doesn't have much wear limit either, but lasts quite a while in my experience). I know the ACT HD + 6 puck will hold the power I'm looking for, but it's a big clutch.

                            I figure for $1100 I'd be most of the way towards a 450-500 rwhp turbo setup... which would be more of a blast than a new clutch.

                            No, not really, because neither clutch setup is going to hold, and your transmission probably wont either.

                            Sell exedy and ACT and buy the tilton or QM setup.

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                            • #15
                              Just found specs for the Exedy twin wear limits to be 4mm new and 3.2mm done, or .039" of wear, .030 on the tilton, so you might get a little more life out of the exedy, though from what i've seen online people end up having the exedys slip before that anyway.

                              Not to mention the service replacement of the exedy, I cant seem to find a replacement disc for it very easily, with the low cost and availability of tilton, you're much better in the long run.

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