| People may read "laggy" to mean "slower" or less responsive. The torque curve will show the net effect of the higher compression engine combined with the lower boost. Do you have the matching torque curves handy? From my experience with 1.0, the torque produced at about 5 psi was similar to the torque produced by a Stage 3 TT at about 8 psi or so IIRC. (That was 6 years ago when it was first built - a lot of changes to the car since then. It will be on the dyno this winter as will 2.0). Also, I have been doing a lot of datalogging with Nistune on 2.0. Small adjustments to the timing at the lower RPM ranges makes a huge difference to the spool up (on the gt28rs with this configuration). This observation is completely consistent with your argument IMO. Retarding the timing (reducing the efficiency of the engine) allows more heat (energy) to escape to the exhaust providing more energy to spin the turbos. Finding the sweet spot resulting in a nice linear predictable response is the trick IMO. For the OP: Don't try this unless you have a) a lot of experience tuning, b) a lot of time and patience and / or c) a deep enough pocket to figure it all out. It is fun, it is not necessarily cheap. If you just want a TT to run around in, buy one.
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