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    • Harrop Engineering doing the "impossible" - Introducing the world's first positive displacement E92/E90/E92 S65 V8 supercharger

      Wow. That is exactly what came out of my mouth when I saw this supercharger kit at Bimmerfest. In all honesty, it was my main motivation for attending the event once I heard it would be there. Some people may be reading this and wondering what the big deal is as superchargers already exist for the M3. That is true, superchargers do exist, but they are all centrifugal style blowers. This is the world's first positive displacement supercharger for the S65 V8.

      Why is that a big deal? Because it's a completely different type of blower with completely different power delivery. This is the solution for those who complain about the M3's torque or for those who do not like the response down low of a centrifgual blower which needs rpm to make boost. This style of supercharger is always making boost, from anywhere in the rev range.

      That is what makes incorporating it on the S66 V8 difficult with its independent throttle bodies as positive displacement blowers usually are set to pull air through a throttle body not blow into it. The centrifugal blowers send air into a manifold. If a positive displacement were to use a similar setup it would be blowing air in while the throttle bodies attempted to close as it is always making boost. See the problem?

      The solution Harrop Engineering came up with was a manifold that fits in between the throttle bodies with a bypass valve fit that relieves pressure as needed and makes sure boost is not made as throttles are closing. Pretty trick setup eh? You can see the design in the photos and also how tight the packaging is. I do not even want to know how many hours were put in trying to get this all to fit.

      The blower employed is a TVS1740 unit from Eaton. This is a roots blower and likely will be set to 5.5 psi or so initially. Boost from this blower is different from a centrifugal and will be harder on the stock rods since it is at full boost right away. Expect horsepower in the low 500's to the wheels.

      Oh and see that little black box to the left of the manifold off a metal area at the inlet? There will be electronic boost control which is likely the first of its kind on a positive displacement setup although I am not able to confirm this. Different maps with different boost levels for different fuel? A possibility, yes.

      This is a big deal and an engineering feat for the S65. My complete and utter respect and that of this network to the guys at Harrop. There is still work to be done here. It is not quite ready although pricing is initially set at $12,990. There is still a lot of tuning to be done but this will be coming eventually.

      Pictures below, much respect Harrop and it was a pleasure meeting you guys at Bimmerfest. You were incredibly nice and answered all my (MANY) questions. Thank you:























      This article was originally published in forum thread: Harrop Engineering Twin Screw S65 V8 Supercharger started by CookieCrisp View original post
      Comments 276 Comments
      1. VCMPower's Avatar
        VCMPower -
        look at there facebook this should be something cool
      1. LostMarine's Avatar
        LostMarine -
        Click here to enlarge
      1. benzy89's Avatar
        benzy89 -
        @Sticky --- Here's what I imagine is the blower they're using (ITBs for the S65)

        Attachment 30685
      1. Sticky's Avatar
        Sticky -
        WTF? You have to be $#@!ting me. Looking into this.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by benzy89 Click here to enlarge
        @Sticky --- Here's what I imagine is the blower they're using (ITBs for the S65)

        Attachment 30685
        This manifold is for an LS2/LS3 motor it says.
      1. Sticky's Avatar
        Sticky -
        Well guess I better get my ass to bimmerfest and take a look a this thing.
      1. fastgti69's Avatar
        fastgti69 -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        Well guess I better get my ass to bimmerfest and take a look a this thing.
        Stop by Ventura Motorsports booth. I might be there!
      1. NikB316's Avatar
        NikB316 -
        Verrry interesting. Been waiting for someone to come out with something out of the norm.
      1. LostMarine's Avatar
        LostMarine -
        can anyone find ANY info on this?
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by LostMarine Click here to enlarge
        can anyone find ANY info on this?
        Yep, just got back from talking to them and seeing the car at BimmerFest. Article coming up.
      1. LostMarine's Avatar
        LostMarine -
        i heard its not complete yet.. and to think SOMEONE said it was impossible...
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by LostMarine Click here to enlarge
        i heard its not complete yet.. and to think SOMEONE said it was impossible...
        Nobody said it was impossible people said it would be difficult and it sure is. I don't think you understand what even makes this work.

        Oh and my car owns the HP record officially now.
      1. MisterEm's Avatar
        MisterEm -
        Wow. This would certainly be a game changer.

        In for more updates.
      1. Itsbrokeagain's Avatar
        Itsbrokeagain -
        Wow.
      1. LostMarine's Avatar
        LostMarine -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        Nobody said it was impossible people said it would be difficult and it sure is. I don't think you understand what even makes this work.

        Oh and my car owns the HP record officially now.

        i understand completely. [atiently waiting for the article.

        as for point #2.. you need to show something Click here to enlarge
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by LostMarine Click here to enlarge
        as for point #2.. you need to show something
        Oh do I have a dynograph and video for you. I'm so happy I don't even know what to say. The car is an f'ing beast and just getting warmed up.

        Click here to enlarge Originally Posted by LostMarine Click here to enlarge
        i understand completely. [atiently waiting for the article.
        I don't know if I will write it today. Writing my Bimmerfest article now.
      1. bdtsulev's Avatar
        bdtsulev -
        Did they keep the itbs? I feel like with the tvs supercharger you no longer need them, or would switching to a large single throttle body really hamper performance enough to make it worth sticking to itbs?
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by bdtsulev Click here to enlarge
        Did they keep the itbs?
        Yep!

        Click here to enlarge Originally Posted by bdtsulev Click here to enlarge
        I feel like with the tvs supercharger you no longer need them, or would switching to a large single throttle body really hamper performance enough to make it worth sticking to itbs?
        You probably don't need them but their solution is trick as the manifold fits in between them. The challenge is really the packaging. Well, then of course the tuning. This is very difficult stuff.
      1. Eric335's Avatar
        Eric335 -
        Cant wait to see this and Stickys car!
      1. bdtsulev's Avatar
        bdtsulev -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        You probably don't need them but their solution is trick as the manifold fits in between them. The challenge is really the packaging. Well, then of course the tuning. This is very difficult stuff.
        I see how packaging could be a huge pain, but it looks like they nailed it. I love how it looks so oem that you almost cant tell that its supercharged