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Next generation
I have considered some changes already to this version.
Here are some thoughts on the next evolution:
First, bring the wastegate tube over the top and back of the turbine tube, then down on the front side. This will do several things:
1. You won't have to move the oil dipstick tube
2. It will keep it further away from the a/c compressor.
3. It will make getting the nut on the bottom stud easier. (it was very hard with the turbo and exhaust manifold still attached to the engine).
4. It will lengthen the wastegate tube giving it more volume, allowing it to work better.
Second, use a 1xD (one times diameter) 2.5 inch mandrel bend instead of the 1.25xD mandrel bend that we used. This will mean less truncation of the tube and better flow.
Third, before the bottom flange, weld in a 2 inch gradual 2.5 to 3.0 inch exhaust expander (as pictured above), then go to a 3 inch 2 bolt flange. The wastegate tube will still collect in but part of it will collect into the expander area so there will be even less interruption when the wastegate opens. The less interference there is from the wastegate opening, the better the turbo can maintain spinning. This way, the expansion to 3 inches occurs sooner, and I can actually call it a 3 inch o2 housing.
Fourth, make a 3 inch downpipe with a 2 bolt flange instead of 3. Its easier to bolt on and the flanges we use are plenty strong enough. Then weld a 6 inch flex tube to the other end and/or leave it open on the other end to do whatever with.. 2.5 inch or 3 inch aftermarket exhaust OR even go back into the stock exhaust, although I don't recommend that because you would delete all the advantage you just got with the bigger o2 housing.
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