All the housings I've seen are marked...might be some that aren't. The turbine wheels are all the same on T3's. The compressor wheels are not marked that I'm aware of, but the compressor wheel trim is determined by measuring the major and minor diameter of the wheel and applying a formula, or comparing the dimensions to this:
http://64.225.76.178/main.htm, which is from this:
http://64.225.76.178/main.htm
Yes, wastegates open (dump exhaust pressure from the area between the exhaust valve and turbine wheel to the exhaust pipe) as pressure builds between the compressor wheel and the intake manifold...they open progressively, and they are fully open at the pressure desired. A turbine housing with an integral wastegate (such as the 6AT's T3) generally can't flow the entire exhaust volume at the release pressure, which is why higher performance turbo setups (race, big trucks) use a large wastegate valve in the middle of an exhaust-pipe sized pipe path between the intake of the turbine and the exhaust pipe. Google up some high-performance turbo installations (and look around at the site above) to see what I mean. Now, do I know that the T3's wastegate can't flow the mind-blowing 300 CFM that the 6AT puts out at 3600 rpm? No, but I'm sure it's a restriction. Don't know if it would make a real difference, just throwing it out there.
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Originally Posted by gifu
are the housings and/or flywheels marked in any way? or does one need to know the exact year make model of the donor, then research what turbo it has?
(just to clarify... cause i've never gotten a solid answer... does the waste gate open up at a certain pressure? so as not to overpressure the system?)
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