Question about T25 vs. T28 turbo

[CTScott]

As an update/correction to what I said about the T28 not spooling well on the 2ZZ-GE Lotus - I found that wastegate was improperly configured on the Adaptronic stand-alone ECU.

When the owner first installed the turbo kit (which included a catless high flow exhaust) he was having significant issues with overboosting, so he set the wastegate to start opening at 2000 RPM. He later bored the wastegate opening to correct the overboost, but never corrected the wastegate settings.

Once I noticed that and corrected it, the T28 transitions from vacuum to boost at about 2500 RPM and hits full boost (current set at 12 psi) at 4000 RPM and maintains it right up to the Lotus's 8500 RPM redline with the lift cam fully actuated.