• Harrop Engineering releases power figures and a new teaser video of their Eaton TVS1740 positive displacement BMW S65 V8 supercharger kit

      The last update we had on the Easton TVS1740 based positive displacement supercharger kit for the S65 V8 in the E9X M3 was back in September with a small teaser video showing the hardware running on an M3. This is a difficult project and to date there is no positive displacement based supercharger kit available for the E9X M3 as they are all based on a centrifugal blower. BimmerBoost is glad to see progress has been made along with some preliminary power figures being released at 5.5 psi of boost.


      How much is it putting down? According to Harrop:

      Dynapack axle data without powertrain correction
      - 3000rpm: 460Nm (340ft/lb) v 330Nm std
      - 5000rpm: 540Nm (400ft/lb) v 340Nm std
      - 7000rpm: 373Kw (500hp) v 255Kw std
      - 5.5psi peak boost

      BimmerBoost of course has to ask, why was it only run to 7000 rpm on the dyno? What is the power figure at redline? Why was a dyno graph not shown? Clearly these are details that will all come but all questions BimmerBoost members will no doubt be asking.

      This a very difficult project to tune for due to the independent throttle bodies but it seems Harrop has developed a solution involved an electronic blow off valve to bleed boost so air is not forced onto the throttle bodies when they are closed.

      There is still work to be done but this kit is coming along nicely and will be quite different in its power delivery to anything else currently on the market.

      This article was originally published in forum thread: Harrop Engineering releases power figures and a new teaser video of their Eaton TVS1740 positive displacement BMW S65 V8 supercharger kit started by Sticky View original post
      Comments 31 Comments
      1. bobS's Avatar
        bobS -
        Not a bad price...
      1. LostMarine's Avatar
        LostMarine -
        Click here to enlarge Originally Posted by m3816 Click here to enlarge
        My point is a Centri with 5-7psi will lose to a root style of same boost range. I only brought up my boost so he understand, I am not dogging his set up and I am too running a Centrifugal.
        Like I said, boost is only one aspect, looking forward to running against one, and showing people wrong, as is common practice these days.
        I love roots blowers, the sound is intoxicating. ? I had one before, so after having more and more experience with different setups and KNOWING the pros and cons to each, its easy to see what will happen.

        The harrop, again, looks monstrously fun, but its the polar opposite of a vortech. Major tq all over, but the s65 will hate it up top. It will resemble an n54 power curve.

        I hope its released soon
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by LostMarine Click here to enlarge
        Like I said, boost is only one aspect, looking forward to running against one, and showing people wrong, as is common practice these days.
        What are you talking about? You have a supercharged on a used M3, relax there. What exactly have you shown or done? You don't hold any record for anything on the platform and never have or will. You seriously delude yourself and it's comical to the actual people who matter on the platform.

        Click here to enlarge Originally Posted by LostMarine Click here to enlarge
        Major tq all over, but the s65 will hate it up top. It will resemble an n54 power curve.
        W T F

        LOL, and people are supposed to take you seriously? Um, this is what a supercharged M156 looks like with a positive displacement:

        Click here to enlarge

        How does it look like an N54? Actually, it looks like the stock curve just moved up EVERYWHERE as it would on the M3 as you are making the max boost as it is spinning at the set spinning from the pulley EVERYWHERE.

        It's always funny to see this guy try to talk tech. So turbo power curves are roots curves now? Too funny.

        Nobody is sitting here and pitting the centri kits against this performance wise. You don't need to constantly interject and remind everyone you have an Evolve kit. We get it, cool, you have a supercharged M3. Now let's get back to talk about a setup other than yours k thx bye.
      1. LostMarine's Avatar
        LostMarine -
        Lol, different motor homeboy, keep it fictional my man

        But.. it does closely resemble what im talking about. Kinda n54 like how even that dyno, doesnt have a flate curve like the s65, and doesnt the m156 flow well up top too...? Almost like an n54Click here to enlarge
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by LostMarine Click here to enlarge
        Lol, different motor homeboy, keep it fictional my man
        Please, do explain to everyone why the S65 will look like an N54 curve suddenly. Please, we're all waiting.

        Click here to enlarge Originally Posted by LostMarine Click here to enlarge
        But.. it does closely resemble what im talking about. Kinda n54 like how even that dyno, doesnt have a flate curve like the s65, and doesnt the m156 flow well up top too...? Almost like an n54
        Umm that is a pretty nice curve and secondly the curve with the blower mirrors it except moving it up. The blower doesn't suddenly make it something different. Once again, you don't know what you're talking about and it's sad.
      1. LostMarine's Avatar
        LostMarine -
        So, in a thread you deleted, called why no twin screw for the s65, I wanted to do a custom roots/ TS blower, and you listed a host of reasons why its a bad choice, but now its great?

        As per the curve, because its gon a be hot all the time and the intercooler wont keep up. High IATs + 8300+rpm + S65 = no power

        But its ok, we will see. Keep at it Harrop, I love the idea, the car sounds amazing. I wish the prototype test guy in NY didnt take it off and buy something different, that would have been funClick here to enlarge
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by LostMarine Click here to enlarge
        So, in a thread you deleted, called why no twin screw for the s65, I wanted to do a custom roots/ TS blower, and you listed a host of reasons why its a bad choice, but now its great?
        Deleted? I think you mean this thread: http://www.bimmerboost.com/showthrea...re-twin-screws

        Don't mind me, just keep pulling things out of your rear end.

        Try reading the thread and maybe you will understand I created it because I like the idea but went into the reasons why it is difficult to do and we have not seen it. If you don't believe me, talk to Harop. I did at Bimmerfest and have have an ongoing dialog with them, do you? Oh, nope, you don't.

        Click here to enlarge Originally Posted by LostMarine Click here to enlarge
        As per the curve, because its gon a be hot all the time and the intercooler wont keep up. High IATs + 8300+rpm + S65 = no power
        Oh, ok, because at 5.5 psi an Eaton TVS is generating how much heat? Do you know where a roots is most efficient? It's like talking to an infant about tuning.

        Click here to enlarge Originally Posted by LostMarine Click here to enlarge
        But its ok, we will see. Keep at it Harrop, I love the idea, the car sounds amazing. I wish the prototype test guy in NY didnt take it off and buy something different, that would have been fun
        They are keeping it up and that's the whole point. Interjecting with trying to compare yourself to it is self-centered, narrow minded, and narcissistic. Maybe you should just let people talk about the kit? I won't show you much more patience if this continues.
      1. LostMarine's Avatar
        LostMarine -
        Sticky, why do you feel the need to project your personal attributes on me? It woukd be wise to stop calling and emailing people and talking negatively about me as well, ive remained as civil and professional as possible, returning the favor would suit you well...

        Oh, and lets see some iats of 5.5 psi at 7k rpms.. ive seen them, but hey, who cares about data when you can create information based on no experience
      1. ezec63's Avatar
        ezec63 -
        Click here to enlarge Originally Posted by LostMarine Click here to enlarge
        Lol, different motor homeboy, keep it fictional my man

        But.. it does closely resemble what im talking about. Kinda n54 like how even that dyno, doesnt have a flate curve like the s65, and doesnt the m156 flow well up top too...? Almost like an n54Click here to enlarge
        Im going to have to disagree with you I don't see how you see a n54 curve in that Weistec M156. The n54 falls off hard up top and your basically losing power after 6K rpm while this motor makes power all the way to redline and never falls only slightly flattens up top while still climbing positively. The n54 will be falling off a cliff at this point. The m156 does flow well that's why you see it mirror it's stock curve with just a lot more hp/torque because it's making ~7psi across the rev range not just at higher rpm while building boost down low/ mid like a centri. Just don't get how you see it resemble the n54 curve at all
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by LostMarine Click here to enlarge
        Sticky, why do you feel the need to project your personal attributes on me? It woukd be wise to stop calling and emailing people and talking negatively about me as well, ive remained as civil and professional as possible, returning the favor would suit you well...

        Oh, and lets see some iats of 5.5 psi at 7k rpms.. ive seen them, but hey, who cares about data when you can create information based on no experience
        You seriously think I call or e-mail people about you? Yeah, my call log is filled with me dialing out to people across the country to discuss some guy on my forum. Are you high?

        Please, post these messages or phone calls. I give you permission.

        Stop making things up and creating drama constantly. You haven't seen anything from Harrop.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by ezec63 Click here to enlarge
        Im going to have to disagree with you I don't see how you see a n54 curve in that Weistec M156. The n54 falls off hard up top and your basically losing power after 6K rpm while this motor makes power all the way to redline and never falls only slightly flattens up top while still climbing positively.
        He doesn't know what he's talking about. You're quite correct regarding the curve.

        Click here to enlarge Originally Posted by ezec63 Click here to enlarge
        The m156 does flow well that's why you see it mirror it's stock curve with just a lot more hp/torque because it's making ~7psi across the rev range not just at higher rpm while building boost down low/ mid like a centri. Just don't get how you see it resemble the n54 curve at all
        All it takes is a glance at the graph and even someone who knows absolutely nothing about cars can see it.

        A positive displacement will move the stock curve up everywhere throughout the rev range not just in certain areas as it isn't spinning an impeller that increases boost with an increase in engine rpm. It is always making boost. Supercharger 101.