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Originally Posted by Dimman
I wouldn't go quite that far, Ichi. When it comes to efficiency, the big difference is that turbos harness 'waste' exhaust (not getting into the 5th cycle of scavenging and pulse tuning for now...) to create their boost, whereas superchargers require HP from the motor to create their boost. Yes new supercharger systems are vastly superior than old ones (also depends if we're talking positive displacement SC or centrifugal SC). But they still cannot compare to a turbo system especially if you want to get into modern turbo tech like variable geometry plus going into higher boost ranges. They also tend to be a bit of a pain for intercooling I hear.
That being said there is a certain appeal of the thought of 'lag-less' boost from a positive displacement SC. The power delivery is virtually linear, just like NA but there is more of it!
As for centrifugal systems, they don't quite make sense to me. Kind of the worst of both systems, laggy like a turbo (well not quite, but not the instant boost of a positive displacement) but needs engine HP to turn it. Where they do make a bit of sense is on bigger OHV V8's where they already make good low end power and need help in their top-end.
So far I have not driven any supercharged system to have anything more than a theoretical opinion, though.
PS: What the hell is that youtube motor for? Exhaust is weird.
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You have good point on turbo waste exhaust.
As for IC, is this good enough?
Prefer FMIC?
oh want smaller IC w BOV?
btw this raptor SC is only running 5.2psi and getting hp & tq close to or same as wrx. Also this Raptor SC can equip w stock wrx or sti IC.
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The stock power was 95kw and 240Nm (disregard the silly bit at start of the run) at the wheels which was very good due to breathing directly into throttle body, no alternator and P/S belt and the very good exhaust system.
The next chart should show the best run, well it was the best final tuned run as the best run was 123kw at the wheels but just too hot later into test to make that number again. So 119kw and 351Nm was measured. Increases of 24kw and 130Nm, that torque is unreal and when you change gear the car cranks right back into it.
The final chart shows the difference between stock and Supercharged at 5.2psi.
To sum it up, its 40Nm ahead of but same engine kw (160kw) as the MY05 WRX 2.0 as delivered to Australia. NICE but with out the dead bottom end power of the WRX. Those in Canada or Nth America's colder area's could expect better numbers too. We are not exactly creating WRX killing weapons here, just increasing your NA power as reliably as possible.
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Still not good enough?
PS
That engine is just regular Impreza engine & the shop tuned it for full SC built Boxer engine. iirc they took that vid while they were testing the engine, so that's why they're not drop inside the car yet.