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I don't know if it'll be as apparent on rotaries......but Honestly although BW is leading development... I still don't trust the internal WG as much as I'd trust dual External units. Funny though. Piston motors usually runner much higher boost levels than rotaries. Rotaries utilize much larger exhaust A/R's than piston motors. Rotaries can use the larger A/R's just as efficiently as Piston motors. Yet Rotaries generate more exhaust gas volume. I'm wondering if the Internal Wastegate EFR's will favor piston motors in terms of boost control just because they generate less exhaust gas volume. I just don't see an IWG EFR holding say 25-30lbs on a two rotor solid enough. I'm building a long runner turbo manifold for my external 1.05 EFR8374. I'll only be running 20lbs of boost on E85 and 14lbs on 91 Octane/race gas. But I'm building the long runner with the best possible Wastegate placement in order to hold boost as solid as possible everywhere...from 2500 all the way up to 8900 if I want. I'll keep you guys updated but I expect great things from this turbo with the high exhaust gas volume!
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