SUs modified for TBI and turbo idea...opinions?

[Guest DaneL24]

I had an idea for modifying SU carburetors to work with a turbo (L28ET, as throttle bodies), and I wanted to know what you guys think. Instead of the air pistons rising as vacuum increases, the air pistons would rise as boost PSI increase. The way I would plan to do this is to block off the vacuum port for the air pistons, install a different spring inside the domes, and drill holes in the top of the SU domes for ventilation (with a small filter). If it works the way I think it will, as boost from the turbo increases, the pressure under the air piston will increase and force it upward, with resistance from the spring inside the dome. As the piston moves up, air will pass through the dome vents so it isn't compressed inside the dome. Maybe the venturis would have to be bored out so there isn't a pressure drop under the air pistons, but I'm not sure if that will be necessary with the turbo. (Since the air piston no longer meters gas because of the EFI, maybe I could just mount it in a fully open position, but it would be cool to reverse the function of the SU's)

 

To mount the injectors, I would build a short spacer inbetween the manifolds and SU's, and that spacer would house the fuel injectors. There would also be a pressure box to replace the air cleaner compartment. I would have to make sure to minimize the width of the manifold/SU spacers and pressure box to ensure clearance between the pressure box and the side of the engine compartment.

 

I know this question has a lot to do with turbos and EFI, but it also involves a lot of carb modification, so thats why I thought I should ask here. So what do you guys think? Will the reversed air piston work with turbo boost?