its a matter of not having enough exhaust energy to drive the turbol. He was only running at somehting like 6 psi, the dyno plot was there, he was sitting at 100hp until like 4k, and then the turbo had enough energy to get moving. Its a simple case of an oversized turbo for a given application. oh, and the dyno plot also had the a/f curve on it too, and that was all over the place, so tuning is definately a problem there too.
1 bar is supposed to be 14.7psi, so I guess we agree on the needing 15psi to get 400hp, and for that setup, I think a T04 is right on, but for anything less, it is too large, and a T3 of some sort is in order. or a T3/T4 hybrid in there somewhere.
