| you hit your target boost pressure and then note the RPM at which you hit your torque peak - they are not the same. I'm not questioning the dyno results here at all, so dont get me wrong. It is just very interesting to see that the torque is still increasing after the turbos have hit their mark! The sport500's use a stock turbine, but the compressor wheel has been upgraded and the housing has been bored to fit the new wheel. The stock turbine wheel is where the great spoolup characteristics come from and they generate a good bit of backpressure on the engine. This backpressure benefits torque production in the midrange and it is interesting to see that although boost is not increasing, the torque still is. This puts a little kink in my target boost rule, "target boost is achieved where the torque peaks". On every turbo I have dyno'd other than these particular units, the torque peak and boost target are one in the same. Take a look though where your torque peaks as compared to Nate's. They are almost identical. If this is the case, then I would have to say that Nate's spoolup would be very much like your boost plot. Thanks for providing the info! Very interesting indeed!
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