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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. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by ultimateendz Click here to enlarge
        no idea what numbers im going to hit....a ZL1 hit 1000whp already with it...thing is im gonna have to finish the R&D on the 4L....the guy that had it it decided to go TT....
        That's fine but what do you think of an automotive comparison?
      1. ultimateendz's Avatar
        ultimateendz -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        That's fine but what do you think of an automotive comparison?
        fine with me
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by ultimateendz Click here to enlarge
        fine with me
        Good, glad to hear it. Will be for a new youtube channel.
      1. NikB316's Avatar
        NikB316 -
        Sticky,
        When can we expect the dyno of your setup? I'm eager to see just how much quicker compared to the VT3 setups it will be. I would love to see something that blows them away by a big margin. I know you mentioned possibly short of 1xxx. Wheel or crank?
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by NikB316 Click here to enlarge
        Sticky,
        When can we expect the dyno of your setup? I'm eager to see just how much quicker compared to the VT3 setups it will be. I would love to see something that blows them away by a big margin. I know you mentioned possibly short of 1xxx. Wheel or crank?
        Right here: http://www.germanboost.com/content.p...raph-and-video

        The VT3 is a children's toy in comparison. It's not even close.
      1. Mike@VAC's Avatar
        Mike@VAC -
        IF all goes as expected, this is going to be really really fun ;-) Though, the stock bearings ain't ready for this abuse....
      1. LostMarine's Avatar
        LostMarine -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        It won't cure it. Glad you read what DBFIU said about meth in the thread I created though.



        You really need to stop talking as if you are an authority. You're making little strides keep going. Do more reading as you have been.
        lol, what? you have done nothing. you paid to have a car built, a car you havent even driven yet, how are you an authority on anything?
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by LostMarine Click here to enlarge
        lol, what? you have done nothing. you paid to have a car built, a car you havent even driven yet, how are you an authority on anything?
        I suppose you designed your SC yourself lol.

        Give your attitude a rest already. If you want to be taken seriously provide more than just a blind opinion. Actually write some technical articles, do some research, contribute some technical content showing us all your amazing awesome knowledge. Go right ahead. Might be more productive than your, "I know you are but what am I" crap.
      1. LostMarine's Avatar
        LostMarine -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        I suppose you designed your SC yourself lol.

        Give your attitude a rest already. If you want to be taken seriously provide more than just a blind opinion. Actually write some technical articles, do some research, contribute some technical content showing us all your amazing awesome knowledge. Go right ahead. Might be more productive than your, "I know you are but what am I" crap.
        ya know, your the text book exmple of hypocrisy right..
      1. Flinchy's Avatar
        Flinchy -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        and cut a hole in the hood?
        ... yes Click here to enlarge
      1. mfatuation's Avatar
        mfatuation -
        The housing for the blower...

        Attachment 30711
        Attachment 30712
        Attachment 30713
      1. LostMarine's Avatar
        LostMarine -
        where in jersey are you? id love to go for a ride once its done. I was extremely considering doing a one-off job like this for a PD blower on the M. I hope its awesome man. How much longer for tuning?
      1. mfatuation's Avatar
        mfatuation -
        Click here to enlarge Originally Posted by LostMarine Click here to enlarge
        where in jersey are you? id love to go for a ride once its done. I was extremely considering doing a one-off job like this for a PD blower on the M. I hope its awesome man. How much longer for tuning?
        I'm in Toms River, you? I'm sure we can meet up once I get it back from California. As for timeline, I unfortunately have no idea. I'll of course keep you guys as updated as I can.
      1. LostMarine's Avatar
        LostMarine -
        Click here to enlarge Originally Posted by mfatuation Click here to enlarge
        I'm in Toms River, you? I'm sure we can meet up once I get it back from California. As for timeline, I unfortunately have no idea. I'll of course keep you guys as updated as I can.
        south jersey, but im up in your area all the time (Ft Dix) definitely interested in seeing this
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by mfatuation Click here to enlarge
        The housing for the blower...

        Attachment 30711
        Attachment 30712
        Attachment 30713
        BEAUTIFUL!
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by LostMarine Click here to enlarge
        How much longer for tuning?
        I can tell you this much, it's going to be a while. Once it's done though...
      1. benzy89's Avatar
        benzy89 -
        Click here to enlarge Originally Posted by mfatuation Click here to enlarge
        As for timeline, I unfortunately have no idea. I'll of course keep you guys as updated as I can.
        Just wondering, is the car being tuned on the stock DME or on a standalone? Your car looks incredible & I can't wait to see it up and running (maybe Bimmerfest East, Eurofest, MPact Click here to enlarge)
      1. LostMarine's Avatar
        LostMarine -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        I can tell you this much, it's going to be a while. Once it's done though...
        I gather that Benvo is collaborating on this..
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by LostMarine Click here to enlarge
        I gather that Benvo is collaborating on this..
        What? Why? What can Benvo do other than resell software? He's nobody.
      1. NikB316's Avatar
        NikB316 -
        More info...