Ahh the auto.
Its amazing how much of a difference they make to spool and drivability of a large turbo.
Another mate (dangerman4) runs a GT35r .82 on his Rb25, that makes all its boost by 4200rpm (24psi) and 5psi by 3000rpm. That fry's first, second and third and doesn't have that feeling of first gear flicking so quick the turbo hasn't had time to spin up.
By 3600rpm odd boost is well and truley in.
I should have been a little more clear..
I am talking about the boost build rpm area, when there is no boost to some boost, up to say 5psi.
After that first 5 or so psi boost increases much quicker
So the .5... You will start to see boost slightly earlier than the .7, this is what I mean by the more linear feel. The progression on to boost.
The xr6 dyno sheet doesn't read low enough to tell.
For the xr6 you would have to run it from almost idle. Remember they are making good boost at 2000rpm so that dyno sheet is useless for what I am describing.
I guess you could describe it as the windmill effect disco has talked about in the past.
Hard to describe but definitely noticable by the seat of the pants.