ITB on a bit different way

HighFive for everybody!

I'm thinking about one of interested side (for me) when i planned to build my VR6 3.2 into my Audi 80B4 with ITB's.

The 3.2 VR engines have adjustable intake and exhaust camshaft. And have adjustable (long narrow and short large diameter) intake manifold runner.

From my experience when you fit ITB's you have some chance about your power and torque band. I want to keep this car as a daily driver so i started the brainstorming.

I want to earn de ITB's throttle response without loosing the oem torque or power so i planned to made a custom ITB setup what is fitted between the head and the OEM manifold. With this setup i can keep the OEM runner lenghts (plus around 20mm what is the ITB housing size).

I planned to make it to the same size and shape than the runners but i have a few questions about that project before i made it...

-What are your opinions about that location of the ITB? Does it work with this setup?

-The oem runners in the VR's is square and rectangle. I made the plan for this shape. How its working in real life? I know from the motorcycles some manufacturers use rectangle shape valves in throttle bodies,

-The third interesting thing is the air flow into the valves. Becouse the space and the offset between the runners i need to fit the axles vertically. When i open the throttle its fed the valves differently. I think in part throttle operation it can support enough flow without any problems but maybe somebody have similar vertically axled itb with some experience. In WOT i think the shaft direction is doesnt matter at all :)

If its a totally dumb thing pls let me know :D

Thank you for your help :)

Ohh, i attach the ITB pic (its only a beta version for sizing...) to see what i want exactly... :)

Many throttle bodies are made with a vertical axis, if that's what you need to match the port it shouldn't be a problem and will offer more control over the butterfly. With some engines there isn't room between bodies for a linkage, so they have to be fitted that way - have a look at some Honda setups and you'll see what I mean.

One thing that can be an issue, though, is syncronising them all to work together, as any variation in machining will mean some will open slightly more than others without incorporating some sort of adjustment in the linkages - it won't be much of a problem at full throttle, but idle and low throttle openings could cause issues.