Quote:
Originally Posted by rjd_F30
It would make sense that peak HP and TQ numbers wouldn't change, but if one were to upgrade the turbo without a tune change, wouldn't the car hold boost better at high rpm after the upgrade, where the stock turbo taps out? For example, on my S2 logs, the boost target is the same 17.5 psi at 3000rpm as it is at 6000rpm, the only difference being I can hit the target at 3000rpm, but not 6000rpm. With the bigger turbo, wouldn't I be able to hit the 6000rpm boost target, thus making the car pull harder in the high rpms?
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The answer really depends on which tune you are running. With MHD or a load-based tune you won't make any more power with a turbo upgrade because the tune is basically setting the power level.
With BM3 and a boost-based tune you can in theory make more power at the same boost level (i.e., actual load would be higher) and the answer to your 2nd question would be yes, you would make more power in the upper RPM by virtue of actually meeting boost target.