theghosttanker Posted May 29, 2009 Share Posted May 29, 2009 I have a chance at a great deal on a turbo...a t3/t4 with an internal wastegate. But the wastegate is set at a low pressure. I will be using a megasquirt and want to run electronic boost control at a higher boost level. questions; Can I eliminate/block off the internal wastegate and use an external? How hard is it to raise the boost on the internal wastegate...is it just a spring replacement? Can I use electronic boost control with the internal wastegate (I think I can but I'm not certain) Should I just hold out for an external gated turbo? At the HP goals I'm shooting for (350-400 at the very most) do I need an external gate? Quote Link to comment Share on other sites More sharing options...
rossman Posted May 29, 2009 Share Posted May 29, 2009 I suggest you do some searching. All of your questions are answered elsewhere in this forum. You can weld the internal wastegate flapper shut if you want to go external. The wastegate actuator is a simple spring diapragm mechanism that holds the wastegate flapper shut. When the diaphragm experiences enough boost pressure to overcome the spring tension it pushes on the wastegate flapper to relieve the boost pressure. Boost controllers are usually manually or electronically controlled valves that limit the boost pressure seen by the wastegate actuator and thus control the boost pressure produced by the turbo. Higher rated actuators can hold more pressure but limit the low end The main advantage of an external wastegate is that it flows better because it usually has a larger port and is separated from the turbine outlet. It can control boost pressure more accurately especially in high flowing applications. There are pleanty of guys in that power range running internal wastegates. I have a chance at a great deal on a turbo...a t3/t4 with an internal wastegate. But the wastegate is set at a low pressure. I will be using a megasquirt and want to run electronic boost control at a higher boost level.questions; Can I eliminate/block off the internal wastegate and use an external? How hard is it to raise the boost on the internal wastegate...is it just a spring replacement? Can I use electronic boost control with the internal wastegate (I think I can but I'm not certain) Should I just hold out for an external gated turbo? At the HP goals I'm shooting for (350-400 at the very most) do I need an external gate? Quote Link to comment Share on other sites More sharing options...
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