Before the rebuild I was running twin turbos that made real power, but with challenges. I use twin Precision 6766 turbos with the dual ceramic ball bearing rotating system. I had to use smaller housings than ideal for fitment as they sit under the car (didn't have the heart to gut all the creature comforts like AC, power steering, ABS braking, etc... to place them in the engine compartment). Believe it or not my car is still very streetable thanks to the boost controller. Additionally, I needed 3" piping to make them work well. 3" piping running under the car and to the air to air heat exchanger is something to see...big as hell and made for fitment issues as well and bending things here and compromising things there. I had some fluid leaks as a result (e.g. pressure side of power steering hoses "massaged"). This also resulted in somewhat "leaky" turbo system due to some bending of the cold side plumbing (think pipes headed to the heat exchanger after the turbos have converted the exhaust to the pressurized air). On top of that there is the oiling system for the turbos. Changing engine oil was a serious PITA due to all the plumbing...2-3 hour ordeal.
This will give some context of how much plumbing....before they were powdercoated black
Anyhoo, these are the snails which I still run in the new setup...
They make stupid power and the power delivery can be very deceptive, unlike my prior positive displacement supercharger which was like a light switch...on or off. No middle.
46mm wastegates
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and 50mm TiAL blowoff valves
Air to air heat exchanger
The new turbo system is a major leap forward for me. Same elements as above, but much of the plumbing is now integrated into my K-frame, including the oiling.
HS