Flange for ITB setup

[xm 1]

so i would like to go with an ITB setup on my Supra, but the question is where to start?

i have seen a lot of ITB Supras and most of them utilize a cut oem lower runner to mount the ITBs, which is maybe a good solution.

i came up with another one, which is to use the flange of a Hypertune turbo intake and mount the ITB on custom made runners.

these seems to be a good and nice solution, but there might be another draw back. the flange has a straight channel coming out of the cylinder head (as seen here)

 

so what i'm asking now is would this work or should i rethink my starting point for my ITB setup.

[Guigsy]

I don't think anyone in the uk has run itb's. So I'm not sure where these lots of cars are you have seen

So I'm guessing people might not have much practice advice to offer

[Wez]

I have only ever seen ITBs done to one NA and that wasn't in the UK

[Chris Wilson]

I would use Jenvey throttle bodies on a custom, fabricated, short stub length manifold. I make plenums from fire extinguisher bottles (spun alloy ones) band sawed longitudinally, in half. The Jenvey bodies use Weber / Dellorto side draught carb manifold spacing, so the intake manifold needs to end up at the TB side with DCOE spacing and flanges. Jenvey do "cut to fit" fuel rail and all necessary adaptors and accessories. I did similar to the the above when I turbo charged a Toyota 4A-GE engine, as nothing commercially available was better than junk. There's a thread on the forum here somewhere but the search engine won't let me go back far enough to find it. You can see it on the GTR forum though:

 

http://www.gtr.co.uk/forum/111976-toyota-4a-ge-formula-atlantic-engine-adding-turbo.html

 

You would have the TB's between the manifold on the head and the plenum. Mine used a single TB at the opening of the plenum. Jenvey do different butterfly sizes and lengths of bodies, and they also have some barrel types if you have deep pockets. It's not hard, just expensive. They make a big difference, which is why Nissan did it properly on the RB26 engine, as did BMW on the some of the M series engines. On a straight six you may need a balance pipe to give sensible vacuum for the FPR, and for a brake servo assuming you aren't binning that.

Edited November 14, 2012 by Chris Wilson (see edit history)