To help with costs at this point it was decided to run 2 smaller wastegates per turbo vs. one larger one that would be more expensive. So 4 wastegates in all were used in the build, two per turbo.
The 46 mm wastegates came from CX Racing and attach with a V=Band. They came with 8 PSI springs (we will run a boost controller that will allow boost levels far past 8 PSI). CX Racing has a couple web sites that are on e-bay and the Internet in general. Above Hooley has made a small manifold and is trial fitting it to the collector.
A more gradual entry into the wastegate manifold would be more ideal but that wasn't going to happen with the short collector length and the mount for the turbo itself in the way. One other option might of been to turn this manifold 90 degrees from where it is now so that the waste gates would of been beside each other in the flow instead of one behind the other. If the wastegates don't flow enough that might be pursued. We should have more than enough wastegate flow but at lower boost settings a lot of the big block's exhaust has to flow through these to keep the turbos from running away into higher boost than we want.
Passenger side wastegates and...
... driver side wastegates. The waste gates will be controlled by one controller. At the time of writing this we are leaning towards a Turbosmart e-Boost2. More on that later in the build.