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I have a 930, and have not turbo'd a non-turbo car, but I can answer a few things here:
1. A 930 WUR made adjustable by Leask will allow you to set the enrichment threshold and the boost enrichment pressure. Neither can be done with an SC WUR since there is no boost and they only enrich on the absence of vacuum. I doubt a factory 930 WUR would be set at the right specs for a turbo SC, so an adjustable one would be my choice.
2. I would call Brian at rarlyl8 directly and discuss.
3. Detonation is what kills these motors prematurely, so it is all about avoiding that. As long as you do, I don't see why your motor life would be shortened. An IC helps, but there are myriad ways to address that, including knock sensors, timing maps, higher octane, proper AFR, etc.
4. I have an MBC and its sole purpose is to limit the max boost. It is not something you touch while driving and it has nothing to do with any levels of boost throughout the rev range other than max boost. You would set it at 0.5 bar and forget it. The "dial of death" that you have heard about simply adjusts the max boost to increase max HP at WOT. Not a good idea for a street car or nearly any car that doesn't have a lot of work done and other safeguards to help avoid blowing the motor.
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1988 930 Venetian Blue
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