I put together a Macho-TA for a local fellow, 1979 Trans Am with a turbo charger (1 of 9 dealer made cars ). The Quadrajet had a special plate under it that provided boost to the outer ends of the throttle blades via small holes drilled in the base plate. This was their way to seal the throttle shafts so pressurized fuel mixtures were not blown into the engine compartment. It also had a special vacuum advance unit which retarded the timing under boost ( Turbo Corvair I believe ). On top of that it had a boost line going into the top of the fuel pump so fuel pressure would rise as the boost went up. I am not sure what was done to the inside of the Quadrajet, it was rebuilt by the guys that designed to turbo system back in the late '70s.
I wouldn't know where to start on the three carburetors, what happens inside them under boost? Where is it likely to leak from? How much boost will the floats take? Lots of questions need to addressed. The Macho-TA didn't have any boost control, it went full boost, as much as the turbo could make, no blow off, or waste gate. I think what kept it alive was the small turbo size didn't make much more then 7 -8 lbs of boost. A modern turbo would blow the crank out of the block!
Last edited by Joe H; 08/01/2021 12:47 PM.
