• Harrop Engineering releases short teaser of their Eaton TVS1740 positive displacement M3 S65 V8 supercharger kit running

      The last time we saw the Harrop Engineering TVS based positive displacement supercharger kit was back in May of this year. In that article it was mentioned that a lot of work was still ahead especially in the area of tuning before this kit would ready to be released. Harrop Engineering clearly has been working on it and posted a teaser video you can see below showing the kit running on the S65 V8 with an M3 on the dyno.


      Unfortunately, no further details are provided with the video which just shows the wheels moving. No dyno figures yet but this is a complicated process and there is a reason nobody has brought a positive displacement M3 kit to market. It's very, very hard to do.

      Pricing is expected to be in the $12,990 area with a release this Fall.

      The main thing to take away is it's still coming and according Harrop relatively soon. BimmerBoost wishes them well and wants to make it clear when this comes to market it will be an achievement worthy of great respect. Good luck to all involved.

      This article was originally published in forum thread: Harrop Engineering releases short teaser of their Eaton TVS1740 positive displacement M3 S65 V8 supercharger kit running started by Sticky View original post
      Comments 62 Comments
      1. e46m3to335i's Avatar
        e46m3to335i -
        I'm getting stationed back in Germany next year and originally had plans to get the Evolve kit upon arrival. This kit is looking pretty promising considering the numbers the Stage 1 puts out. I think it will make for a really fun DD. Hopefully the tuning is solid and wont have any hiccups. Looks like the install will be a but more simple compared to the centri also.


        -Nick
      1. LostMarine's Avatar
        LostMarine -
        Click here to enlarge Originally Posted by e46m3to335i Click here to enlarge
        I'm getting stationed back in Germany next year and originally had plans to get the Evolve kit upon arrival. This kit is looking pretty promising considering the numbers the Stage 1 puts out. I think it will make for a really fun DD. Hopefully the tuning is solid and wont have any hiccups. Looks like the install will be a but more simple compared to the centri also.


        -Nick
        They have numbers out!?
      1. e46m3to335i's Avatar
        e46m3to335i -
        Over on M3P, there is a post that has a Harrop ad stating some Stage 1 numbers. I would post the link but im sure that's not chill here, lol.

        -Nick
      1. LostMarine's Avatar
        LostMarine -
        Click here to enlarge Originally Posted by e46m3to335i Click here to enlarge
        Over on M3P, there is a post that has a Harrop ad stating some Stage 1 numbers. I would post the link but im sure that's not chill here, lol.

        -Nick
        This one?

        Click here to enlarge
      1. e46m3to335i's Avatar
        e46m3to335i -
        Yes
      1. benzy89's Avatar
        benzy89 -
        Really hoping that Stage 1 is max power for the stock motor.... Then again I have no idea how stressful 5.5 psi (from that blower) is on a stock motor/internals
      1. e46m3to335i's Avatar
        e46m3to335i -
        If im not mistaken, from my Coyote 5.0 days. There is more parasitic loss from roots/TVS/Twin Screw blowers than Centri's. Im also pretty sure they put more strain on the rotating assembly(mainly the crank pulley).

        -Nick
      1. LostMarine's Avatar
        LostMarine -
        Click here to enlarge Originally Posted by e46m3to335i Click here to enlarge
        If im not mistaken, from my Coyote 5.0 days. There is more parasitic loss from roots/TVS/Twin Screw blowers than Centri's. Im also pretty sure they put more strain on the rotating assembly(mainly the crank pulley).

        -Nick
        eh, i was in love with the idea, but after reviewing more data, im trying to stay quiet until they release details. If they have HP to quote id like to see the graph at least. show us that low down tq hit
      1. e46m3to335i's Avatar
        e46m3to335i -
        Agreed. A graph will put things in a better perspective for sure.
      1. benzy89's Avatar
        benzy89 -
        ***Edit -- isn't max power for stock internals.... This setup will def suffer from greater parasitic loss, and depending on the intercooling cores (two rows of separate air/water intercoolers located above each row of the ITBs) it might also suffer from extended use and timing reductions from high IATs.


        BUT if they nail the tuning & setup down, get it to be efficient, it should outperform a near-equal power centri setup. Nothing like a real world comparison though
      1. LostMarine's Avatar
        LostMarine -
        parasitic loss is only important at low rpms, which is where the tvs shines, so its basically negated.
        HEAT however is going to be a big factor, especially using an internal air-water cooler. ESPECIALLY how sensitive the S65 is to heat. Im waiting for that real world scenario Click here to enlarge
      1. e46m3to335i's Avatar
        e46m3to335i -
        Here's something I used in the past on a couple GT500's I had. Obviously its not for a e9x platform but I wouldn't see why it couldn't be retro fitted in to the S65 engine bay(seems to be a decent amount of room in there). Its a great kit though.

        http://www.killerchiller.com/system_1_page.htm

        Something also to think about. If the Harrop kit doesn't supply the TQ that everyone is looking for, all that would have to be done is for a company to manufacture a slightly larger OD crank pulley. A lot of Root/TVS/TS kits add on gobs of torque by using one. Only down side is they produce a little more stress on the crank pulley and shoot the AIT's up.
      1. LostMarine's Avatar
        LostMarine -
        Click here to enlarge Originally Posted by e46m3to335i Click here to enlarge
        Here's something I used in the past on a couple GT500's I had. Obviously its not for a e9x platform but I wouldn't see why it couldn't be retro fitted in to the S65 engine bay(seems to be a decent amount of room in there). Its a great kit though.

        http://www.killerchiller.com/system_1_page.htm

        Something also to think about. If the Harrop kit doesn't supply the TQ that everyone is looking for, all that would have to be done is for a company to manufacture a slightly larger OD crank pulley. A lot of Root/TVS/TS kits add on gobs of torque by using one. Only down side is they produce a little more stress on the crank pulley and shoot the AIT's up.
        Thats a popular kit actually. I think @boostedM3 was going to run it on his ess650/AR700 kit. not sure how it worked out.

        I dont see how it cant have the boost/tq down low, its the concept behind the whole thing. its how its going to handle 83-8600 rpm and skyrocketing IATs. There has to be some, but i dont know many engones that rev that high and use PD s/c's
      1. Sticky's Avatar
        Sticky -
        This kit really is about driveability and fun factor not all out numbers. It obviously won't be able to take down the big hp centri's.
      1. BigM62's Avatar
        BigM62 -
        On a side note there is a guy (Ballard540) that is building a Lysholm powered E39 540i to 950 hp over on M5Board and Bimmerforums. Hopefully he posts here. He bought the car form David who had all the problems with ICS.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by BigM62 Click here to enlarge
        On a side note there is a guy (Ballard540) that is building a Lysholm powered E39 540i to 950 hp over on M5Board and Bimmerforums. Hopefully he posts here. He bought the car form David who had all the problems with ICS.
        950 is a lot... I don't think he will hit that.
      1. e46m3to335i's Avatar
        e46m3to335i -
        Here's how I see forced induction in "most" scenarios.

        HP
        Turbos > Centri > Twin Screws > Roots/TVS > N2o

        TQ
        N2o > TVS/Roots > Twin Screws > Centri > Turbos
      1. Sticky's Avatar
        Sticky -
        I wonder why you put centri in front of turbos for torque.

        Twin screw also will make more torque than roots which get out of their efficiency range.

        Additionally turbos will make more torque than the positive displacements just deliver it differently.
      1. e46m3to335i's Avatar
        e46m3to335i -
        In my past experiences. TS's make more HP than TQ compared to roots and TVS's.

        TQ for turbos IMHO relies completely on the gearing and turbo selection. If properly chosen they can produce gobs of torque almost as fast as a blower. More times than not there is always a trade off with turbos it seem. Centri's can produce a decent amount of TQ also, just a more linear feel.

        Not trying to preach the choir on this one as im sure there are people on here to include yourself that have way more knowledge than I do. Just basing my opinion off my past experiences.

        The more I think about it, I would have to put turbos in front of a Centri.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by e46m3to335i Click here to enlarge
        The more I think about it, I would have to put turbos in front of a Centri.
        You should.