Two throttles?

[thornado327i]

Here is a new idea - or maybe not so new... <searching...> damn.
http://www.r3vlimited.com/board/show...&highlight=tbs

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]

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.

[thornado327i]

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...

[rs4pro3]

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

[Farbin Kaiber]

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

[z31maniac]

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.

[rs4pro3]

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.

[ditchdigger]

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.

[Farbin Kaiber]

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

[thornado327i]

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.