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Please, don't get me wrong. Whole VE discussion was purely theoretical. You don't actually need to measure VE in order to build/tune your engine. You can just watch the dyno graph and see where torque goes up. After all, it's maximized torque troughout the rev range you want. Nobody actually measures VE. VE tables are empirically found out by process of mapping the EFI system.
Perfect daily driven 930? Well what's perfect for one person probably isn't for other. There are many factors here:
1. Cost
2. The fun factor ("does it rev a lot and sound sporty")
3. EFI or not, twin turbocharger or not?
4. Do you have to start with 930 core?
The easiest way to achieve steady 400hp goal with as little money as possible would be by doing EFI-conversion on 930 engine using Carrera intake (Megaquirt & Spark), modern turbocharger (Garrett GT35BB is nice), stock exhaust and good intercooler.
Driveability could be further improved by adding a set of short/hi flowing headers, selecting a smaller turbo that doesn't leave a headroom for gazzillion horsepower but spins up faster (GT30BB).
Boost should be capped relativly low, like @ 0.7-0.8 bar.
Such combo would happilly pump 400hp all day.
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Thank you for your time,
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