Duder
Watch it man, there's a beverage here!
- Joined
- Dec 9, 2009
- Location
- Torrance, CA USA
I was afraid you?d say that. It?s weird how many manifolds I see with a wastegate inlet completely perpendicular to the flow at the collector. Seems like my setup should be at least as good as that.
True - but with your long bent tube between the turbine housing and wastegate inlet, you've got more restriction between the main exhaust flow path and the wastegate valve.
The wastegate is effectively acting much smaller than its physical diameter due to the 90 deg take-off angle and the long bent intermediate tube. If you can't improve that stuff due to packaging constraints, your other option would be up-sizing to a larger wastegate valve to gain back the lost flow capacity.
At some point your intermediate tube leading up to the wastegate will choke however, and it won't matter how large you go on the valve itself - the system won't have any reserve flow capacity. You could estimate that based on the flow area of your intermediate tube compared with the full open (cylindrical) flow area between the valve and seat. Both of those values need to be reduced by some factor to account for the bend restriction and internal restriction in the wastegate housing, but at least that would give you an idea of whether the tube or the valve will reach choke first.