Internal W/G vs External W/G
Internal W/G vs External W/G 
Boosting Daily
iTrader: (14)
Joined: Aug 2004
Posts: 2,084
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From: Goldsboro, NC
Rep Power: 284 
Internal
when the boost pressure is equal or greater to the spring in the actuator diapragham, the actuator pushes an arm that opens a gate inside the ehaust manifold that allows exhaust to bypass the exhaust turbine when peak pressure it reached.
Pros: Cheaper
Cons: the wastegate on internal ones tend to be small, and not ideal for heavily boosted setups
External
Mounts directly onto the turbo manifold, or elsewhere. When the boost pressure is equal to or greater to the spring setting on the wastegate, it pushes the gate open and exhaust bypasses the turbo and is either recirculated the the exhaust system or vented to the atmosphere (open dump)
Pros: Easier to tune, more reliable
Cons: More expensive.
when the boost pressure is equal or greater to the spring in the actuator diapragham, the actuator pushes an arm that opens a gate inside the ehaust manifold that allows exhaust to bypass the exhaust turbine when peak pressure it reached.
Pros: Cheaper
Cons: the wastegate on internal ones tend to be small, and not ideal for heavily boosted setups
External
Mounts directly onto the turbo manifold, or elsewhere. When the boost pressure is equal to or greater to the spring setting on the wastegate, it pushes the gate open and exhaust bypasses the turbo and is either recirculated the the exhaust system or vented to the atmosphere (open dump)
Pros: Easier to tune, more reliable
Cons: More expensive.
Last edited by EternalBlue_Vic; Jan 7, 2005 at 11:15 PM.
Joined: Feb 2003
Posts: 21,820
Likes: 1
From: OH-IO
Rep Power: 511 
i got a tial 38 mm external wastegate and it pwns all. not really that expensive. you can find a used one for like $150 shipped on www.honda-tech.com
mine:
mine:
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