Quote:
Originally Posted by Kingtal0n
exhaust gas takes up more volume the hotter it is.
Therefore EGT has a direct influence on the gate behavior. It is likely you are seeing a wide range of results due to a wide range of EGT and post turbine exhaust system configs
to fix this issue and keep the internal gate may be as simple as reducing the EGT via tuning or water injection,
plus a superior flowing downpipe and exhaust (cutout system or larger diameter tubes)
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A freer-flowing exhaust would just make the problem worse. The faster-moving exhaust would take the path of least resistance which in this case is the larger turbine wheel and not the wastegate flapper. This is common problem on FD RX7's when a full turboback is installed. Porting the wastegate helps, but in many cases you need to keep some restriction in place like the catalytic converter to prevent boost spikes on the small factory wastegates.