But you won’t be generating enough work and heat at 1600rpm you’ll be glazing bores and coking the turbo unless you regularly run it up to at least 75-80% power. So yes you might find 1600rpm is a lovely ‘pottering’ speed but you need to run up to mid 2000s frequently to get the turbo spinning and hot. If you try gradually increasing rpm you’ll start hearing the turbo coming ‘on song’ around 2200rpm and really getting into its stride at 2400+. You need to run it at these speeds for a good burst every few outings. Your max is 3200rpm and every few weeks you should run it up to close to that for at least 5 mins.