M520h tuning – r3 AMS to r4 APR
Background: The reinstallation of the Mabotech M520h turbocharger and the addition of MPI raised questions about the next tune to use. I’ve been eyeing the Simos Tools’ logging capabilities, which are most extensive when paired with a Simos Tools tune, and decided to try it. I contacted Russell Road & Racing, a UK-based tuner, about
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