dual wastegates?
dual wastegates?
Jun 13, 2009, 10:00 PM
#4
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This car is not twin scroll and has 2 wastegates. He explains in post 78 that it helped to eliminate some boost creep.
https://www.evolutionm.net/forums/ev...cs-inside.html
https://www.evolutionm.net/forums/ev...cs-inside.html
Jun 14, 2009, 03:27 AM
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If you have a single gate that is maxed out with respect to the amount of exhaust gas that it can vent, then you have to start to open it sooner to control boost. The sooner the gate opens, the slower your turbo will spool. The addition of a second gate allows you to keep the gates closed on their seats considerably longer. So, you can "tune" a dual-gated system to spoolup your turbo faster.
Last edited by sparky; Jun 14, 2009 at 03:45 AM.
Jun 14, 2009, 12:10 PM
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Iīve had a single scroll, internally gated turbo that we could wire the integral gate wide open and the turbo could not be kept under 25 PSI. Of course, it was not a stock internals turbo. It was a huge H2 wheel stuffed into a fully cut TO4E .63 A/R housing.
A single(remote)DeltaGate couldnīt control boost either. So, we had to run the interrnal gate with the DeltaGate as a backup. The Delta was set to open one PSI after the internal gate.
This particular Frankenstein was an aftermarket Buick bolt on turbo designed by the late NHRA dragbike champ, John Myers. The turbo would put out about the same peak power as a TE-49 but due to the larger turbine wheel it was a bear to control boost on.
From a zero boost roll-on, with a 5 foot walkout, it would give 25 PSI by the time you crossed a 4 lane intersection.
Sorry for the non-Evo O.T. But, yeah, dsevo, normally if you canīt control boost with the integral gate on a stock, factory spec, single scroll turbo, then something is probably way wrong.
A single(remote)DeltaGate couldnīt control boost either. So, we had to run the interrnal gate with the DeltaGate as a backup. The Delta was set to open one PSI after the internal gate.
This particular Frankenstein was an aftermarket Buick bolt on turbo designed by the late NHRA dragbike champ, John Myers. The turbo would put out about the same peak power as a TE-49 but due to the larger turbine wheel it was a bear to control boost on.
From a zero boost roll-on, with a 5 foot walkout, it would give 25 PSI by the time you crossed a 4 lane intersection.
Sorry for the non-Evo O.T. But, yeah, dsevo, normally if you canīt control boost with the integral gate on a stock, factory spec, single scroll turbo, then something is probably way wrong.
Last edited by sparky; Jun 14, 2009 at 12:40 PM.
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