1) What kind of Mileage are you getting from you 2.3 turbo setup? (Also what kind of setup are you running? Boost level, Turbo size, trans, gears, fuel source, ect.....)
2) What kind of Boost will the stock engine handle?
3) Anyone here ever done a home built turbo setup with or without blow through carb?
1.) I can't answer that from experience just yet, but I will say that an
EFI 2.3t/T5 is fully capable of over 30mpg in a slippery, but very heavy Thunderbird. That's with 1982-era electronics. I've heard reports of the same driveline doing around 30 in a Pinto. A carburetor won't do as well, but I would
hope for 26+ with careful tuning and driving. If you do any kind of mixed driving, then the carburetor is a 5-10% economy loss off the bat simply because it can't shut off the fuel during deceleration like EFI can (called "overrun fuel cut").
2.) 8-10psi without any pinging. A factory 2.3T with forged pistons and 8.0:1 compression will handle as much as it takes to fold the stock rods, which is around 350-400rwhp/rwtq and typically 20-30psi depending on build.
3.) No, but you might find something on theturboforums
.com. You'll need a fuel pump that can supply 5-7psi above your peak boost pressure and a vacuum-referenced 1:1 pressure regulator with an EFI-style return line.
I would strongly suggest getting a wideband O2 sensor for tuning the AFR.