If trying to spool a larger turbo w/tight convertor keep rpms from climbing quickly?

[2QUIK6]

I just finished installing a test GT35 turbo, and I have a 2700 stall convertor, I can build 8# of boost with it on the foot brake, but the rpms will not climb very fast when trying to build boost, I can almost floor the pedal and the rpms will go no where, but slowly climb, it takes at least 5 seconds to build the 8#.

Is this what a convertor that is too tight would do, I just thought the rpms should climb right up until the stall of the convertor is surpassed and the tires would break loose with little or no boost built???

 

[azgn]

that's why higher stall converters are made.......

 

[2QUIK6]

I guess it does take torque to ramp up the rpms quick and with less boost there's less torque to do that....with the stock turbo I could hit 15# and the 2700 rpms is about 2 seconds, but since it was producing more boost quicker it was producing more torque quicker to ramp up the rpms.... Is that the physics that explains this?