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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 NikB316 Click here to enlarge
        More info...
        Just my luck someone would put up the flyer. I was going to scan mine and attach it with my article. Guess I should have done it faster. Can't catch a $#@!ing break...
      1. benzy89's Avatar
        benzy89 -
        Click here to enlarge

        Click here to enlarge


        $13k & Stock DME Tuning. You can also sign up for updates on the website.
      1. PianoProdigy's Avatar
        PianoProdigy -
        Blower should be good for 1000-1100 cfm based on speculation comparing it to the 1900's specs. Efficiency is pretty damn good for a PD design blower. While that may "only" generate 600-650 rwhp peak power, it will be nasty in the low-midrange.
      1. LostMarine's Avatar
        LostMarine -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        What? Why? What can Benvo do other than resell software? He's nobody.
        I dunno, oddly, i dont recall him tuning anything until a few days after he scanned my car with the Evolve tune on it..
      1. 0-60Motorsports's Avatar
        0-60Motorsports -
        Click here to enlarge Originally Posted by LostMarine Click here to enlarge
        I dunno, oddly, i dont recall him tuning anything until a few days after he scanned my car with the Evolve tune on it..
        Wow.
      1. LostMarine's Avatar
        LostMarine -
        Click here to enlarge Originally Posted by 0-60Motorsports Click here to enlarge
        Wow.
        now that i think about it, he scanned a lot of cars that week, a good sampling of various tunes if one were so inclined to see the differences..
      1. 0-60Motorsports's Avatar
        0-60Motorsports -
        Click here to enlarge Originally Posted by LostMarine Click here to enlarge
        now that i think about it, he scanned a lot of cars that week, a good sampling of various tunes if one were so inclined to see the differences..
        So your saying that he basically copied various tunes on cars to make his tune?
      1. LostMarine's Avatar
        LostMarine -
        Click here to enlarge Originally Posted by 0-60Motorsports Click here to enlarge
        So your saying that he basically copied various tunes on cars to make his tune?

        Im not saying anything, except He was very very excited to know i had the evolve tune on my car, and shortly after he was in the tuning business
      1. MisterEm's Avatar
        MisterEm -
        Click here to enlarge Originally Posted by 0-60Motorsports Click here to enlarge
        So your saying that he basically copied various tunes on cars to make his tune?
        I hope that is not the case but I wouldn't be surprised. That is pretty sad way to make a buck if you ask me... I could not look at myself in the mirror making a dollar off of another's dedication in my field.

        Lame.
      1. 0-60Motorsports's Avatar
        0-60Motorsports -
        Click here to enlarge Originally Posted by LostMarine Click here to enlarge
        Im not saying anything, except He was very very excited to know i had the evolve tune on my car, and shortly after he was in the tuning business
        hhmmm I know a few others have done this already and are claiming to be tuners or code breakers lol.
      1. NikB316's Avatar
        NikB316 -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        Just my luck someone would put up the flyer. I was going to scan mine and attach it with my article. Guess I should have done it faster. Can't catch a $#@!ing break...
        Why was my post edited with the flyer removed? I see the flyer a couple posts down from when I posted it? Confused...
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by benzy89 Click here to enlarge
        I was going to post this in a separate article you guys are killing me.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by LostMarine Click here to enlarge
        Im not saying anything, except He was very very excited to know i had the evolve tune on my car, and shortly after he was in the tuning business
        Why did he touch your car?
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by NikB316 Click here to enlarge
        Why was my post edited with the flyer removed? I see the flyer a couple posts down from when I posted it? Confused...
        Because I was going to scan my own flyer and put it up in an article but too late now I guess.
      1. LostMarine's Avatar
        LostMarine -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        Why did he touch your car?
        coding and euro mdm
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by LostMarine Click here to enlarge
        coding and euro mdm
        And he took the opportunity to download your tune eh? That sounds like Benvo, yep. And then after that he sells tunes eh?

        You shouldn't have told him you had the tune but oh well too late.
      1. mfatuation's Avatar
        mfatuation -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        BEAUTIFUL!

        Thank you!!!
      1. mfatuation's Avatar
        mfatuation -
        Click here to enlarge Originally Posted by benzy89 Click here to enlarge
        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)
        Stock DEM sir. Glad you like the car, I was guessing most people would hate on my wheel choice, but I really wanted to build something that I liked, not something that I knew everyone else would. I'll bring it out to a few shows for sure! Where in NJ are you?
      1. MisterEm's Avatar
        MisterEm -
        Click here to enlarge Originally Posted by mfatuation Click here to enlarge
        Stock DEM sir. Glad you like the car, I was guessing most people would hate on my wheel choice, but I really wanted to build something that I liked, not something that I knew everyone else would. I'll bring it out to a few shows for sure! Where in NJ are you?
        I like the blue contrast with the gold wheels. Outside of interlagos, BMW makes some lovely shades of blue - Estorilblau, Atlantic, LSB, Topasblau etc. Your car reminds me of the contrast of the Santori (sp?) blue and gold BBS rims circa 2005-2006 STi's - albeit a much better chassis!
      1. rooringhusky's Avatar
        rooringhusky -
        Click here to enlarge Originally Posted by MisterEm Click here to enlarge
        contrast of the Santori (sp?) blue and gold BBS rims circa 2005-2006 STi's - albeit a much better chassis!
        THIS!! Saw this car at bimmerfest....at first I took a double take on the rim/color combo but thats what drew me in to look at the car...then I noticed the twin screw and I was caught starring for quite a few minutes Click here to enlarge Love the rim/color (just like MisterEm mentioned its on a way better chassis and reminds me of the older STis)...