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You can see the turbine on the right is a non-modified OEM turbine wheel and the turbine on the left is a "clipped" OEM turbine wheel. I did this on my jet engine project as the turbine for most gasoline engines has a smaller exhaust section with respect to the comrpessor section as compared to that of a diesel engine. My jet engine was putting the comrpessor into surge at higher pressure levels, so I clipped the turbine to allow it to flow more volume. This took the compressor out of surge and improved thrust by about 20%. Now, in terms of how this will affect a gasoline resiprocating engine is actually quite analogous. It is effectively the same as using a larger A/R turbine housing, but with some small differences. Because you aren't increasing the A/R of the turbine housing, you are maintaining the same gas velocity at the housing's nozzle. The effect is that it will typically maintain the same spoolup (very slightly less) but have less backpressure at high RPM, thereby improving torque production through the higher revs. If you were to do this to a set of stock turbos and put it on a Z, you would see a very slight decrease in spoolup, but significantly improved horsepower up top (because it will be able to maintain higher torque as the revs increase). It will only mostly improve peak horsepower while the peak torque will be about the same. See, I knew I built my jet engine for something. (Take that Maglito!) ;-) 
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[ agpowers@bellsouth.net ] Enthusiasts soon understand each other. --W. Irving.
Are you an enthusiast? If you are out to describe the truth, leave elegance to the tailor.
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