The new turbo is quite different in how it spools compaired to the stock turbo... From idle up to around 2000 rpm, it doesn't do much, where as the stock turbo was already making boost. However, once it is around 2500 rpm and begins to spool, it spools faster from 10 psi on up. The stock turbo was more linear in its increase in boost, the new turbo goes up slow to around 10, then will slam the needle to whatever boost setting it is waste gated at. Also, on the highway, I can push around 15lbs of boost at 3k rpm with the converter locked and the pedal down to the detent before kickdown. With the same fueling, the stock turbo wouldn't make more than 10lbs of boost at 3k rpm.
Its a huge improvement overall, but I'm looking for a .48 A/R exhaust housing, as I think it would have better low end spool up without hurting the top end too much. If it was a manual, it would probably be less noticeable, but the stall speed of the stock converter pretty much holds it at to low of an rpm to build any decent boost untill you get going a little bit (if you floor it from a stop). Also, with the bigger housing I cant build barely any boost if I brake torque it. However once your are rolling, and get into it, the car is totally different compaired to the stock turbo...
Jason
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