I've never read too much on the subject of twincharge but i've always had the thought of Having the Turbo and SC using their own air supply. e.g one or the other not blowing through each other. So you have 2 inlets on the intercooler, the SC feeds one and the Turbo the other. Most likely you'll need to use a MAP ECU for this and not sure how you would control boost through the wastegate on the turbo and the (whatever is it) on the SC. I've seen this setup on a picture of RB26 and looked pretty good. Nice clean setup. Just controlling boost would be the main issue i would think.
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