Two throttles?

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  • thornado327i
    E30 Addict
    • Oct 2006
    • 501

    #1

    Two throttles?

    Here is a new idea - or maybe not so new... <searching...> damn.


    Seriously now. We've seen M20's with six tb's - lots of work - there's no way I'll have enought assets (time, money, will) to do that.

    So how about a custom made dual manifold with mid/short-runners gathered 3to1 with two linked tb's?

    What do you think?
  • rs4pro3
    R3V Elite
    • Oct 2003
    • 5808

    #2
    I would not do it, think of how water flows, in the stock intake air enters, hits the back wall then goes down the cylinders. No with two throttles on opposite side like that, the air is going to enter from both sides, smack itself in the middle, and create turbulence and cause uneven air flow inside the manifold it self. Take a look at the m42 manifolds, they have 2 throttle plates but stacked on top of each other on the same side.
    Either build a 6-1 manifold with one big ass throttle, ITB's, or keep the stock manifold with a big bore manifold.
    85 325e 2.7 ITB'd stroker

    Comment

    • thornado327i
      E30 Addict
      • Oct 2006
      • 501

      #3
      I meant building two separate manifolds (that's what I meant by writing dual 3to1) so that tb's won't battle eachother every time they open...

      Going 6to1 (from what i've heard) results in a big loss at lower rpms and I'm looking for a solution that would be a compromise - get some more power at higher rpms without loosing much at lower ones.

      If my thinking makes abso-fuckin-lutely no sense at all, please someone stop me before I make a complete ass of myself...

      Comment

      • rs4pro3
        R3V Elite
        • Oct 2003
        • 5808

        #4
        It is all about runner length, diameter, plenum volume etc. on where the torque and HP kick in for the engine. So you can make a 6-1 work for what you want it's just most are built for high RPM flow for a big old turbo
        85 325e 2.7 ITB'd stroker

        Comment

        • Farbin Kaiber
          Lil' Puppet
          • Jul 2007
          • 29502

          #5
          Hey Thornado, did you see rs4pro3's ITB setup? He put in enough work to know better. I'd take his word.

          Comment

          • z31maniac
            I waste 90% of my day here and all I got was this stupid title
            • Dec 2007
            • 17566

            #6
            Originally posted by thornado327i

            Going 6to1 (from what i've heard) results in a big loss at lower rpms and I'm looking for a solution that would be a compromise - get some more power at higher rpms without loosing much at lower ones.

            The stock manifold is the compromise between high and low RPM power.
            Need parts now? Need them cheap? steve@blunttech.com
            Chief Sales Officer, Midwest Division—Blunt Tech Industries

            www.gutenparts.com
            One stop shopping for NEW, USED and EURO PARTS!

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            • rs4pro3
              R3V Elite
              • Oct 2003
              • 5808

              #7
              every manifold is a compromise, do some searching online for Hemholtz frequency etc....
              If you design a manifold correctly you can create a ram air effect and gain some self forced induction.
              85 325e 2.7 ITB'd stroker

              Comment

              • ditchdigger
                Wrencher
                • Nov 2007
                • 238

                #8
                ITB's work on a different principle than a manifold setup. Adding another throttle body to a stock manifold will simply make the car feel like it is at WOT much sooner in the pedal travel. After the point that the throttle body is lo longer a restriction there are zero gains to be had by going larger.

                I am trying to think of what benefit two 3 into 1 manifolds would provide and I cant think of any. Syncing them would be a pain though.

                Comment

                • Farbin Kaiber
                  Lil' Puppet
                  • Jul 2007
                  • 29502

                  #9
                  Sounds like adding a whole new level to trying to balance minuki's on a 240z w/ the ball float thingy but on crack.

                  Comment

                  • thornado327i
                    E30 Addict
                    • Oct 2006
                    • 501

                    #10
                    So basicly it's a loss of time and money. Is there a way to put a bigger tb on a stock manifold? And what tb would that be?

                    rs4pro3 - your setup kicks ass, and as much as I'd like to do something like that (with slightly longer runners) I'm afraid it's beyond my skills. Finding K75 parts is not so easy here either. Buing a set form dbilas would be great, but it costs a fortune.

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