I don't believe that more than one waste gate is needed in this application. The total exhaust output should be regulated (wasted, to some degree) by a single, poppet-valve controlled by the signal from a boost controller, a device that keeps the [waste gate] actuating signal in abeyance, until boost comes up to the pre-set limit. Once fifiteen pounds (or, whatever the waste gate (and, boost-controller,) is adjusted to, of measured pressure, has been generated by the turbo, the signal to open then goes to the waste gate and it opens immediately, ensuring that over-boost does not occur. Failure to run a boost controller will result in the waste gate trying to open gradually, a little at a time, (in a stall-start situation, for example,) as boost builds... not conducive to quick spooling.)
"Intercooler" is mis-used 90-percent of the time. What most of us call an "intercooler" is actually, an "aftercooler." An "intercooler" is the heat-exchanger that goes between two compresssors in a 2-(or, more-) stage forced induction system. Sometimes, two turbos (or, superchargers) are used in series, one feeding the other, and when they install a heat exchanger in between them, it is called an "intercooler." But, any air-cooling device used in forced induction, even with ONE compressor, has come to be called an "intercooler."
Like "Coke" and "Kleenex"... popular usage dictates our vernacular...:coffee2:
The center bearings that are water-cooled and usually just called water-cooled turbo's, I think... and have nothing to do with intercooling, which is, in reality, "charge cooling."
Hope this helps...:blob:
