Quote:
Originally Posted by PoorMans180SX
External are great with older turbo designs, but EFR?s and the G-series have wonderful internal gates that are good enough for everything but kill mode. I don?t see a reason to run external on these turbos unless you?re trying to push the limits of flow.
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I have tuned more than few engines running internal wastegate EFR turbos and while they do work ok the little internal wastegates are indeed a restriction in some cases (not all though).
Examples:
- On an S2000 (built f22 engine) I tuned running an internally gated twin scroll EFR turbo kit the internal gate could not quite flow enough which choked power and led to some less than ideal boost control. Completely manageable but not nearly as efficient as the same setup using larger external gates.
- On my personal S13 (built KA24-T with ported cylinder head) i ran/tested the first EFR Full-Race received while i was working there. Again the turbo did work well BUT the small wastegate could not keep up and i had to tune around some boost creep issues, again nothing unmanageable BUT not the ideal setup. Single external
Tial MVS wastegate instead and boost was rock solid/steady.