tinpis & plovet the theory of power on decents is not really an old wives tale. The big dirty old lycos handle a bit more abuse than the conts, never really seen many turbo lycos that had been treated with great love and care (skydive and remote wa rpt nevergo's and chieftians) and they just seemed to take it in their stride. But treat a highly strung and lightly built engine like a gtsio the same way and you might be noticing a few expensive repair bills. Apart from keeping the heat in the engine to prevent shock cooling you are also maintaining a manifold px suitable in keeping sufficient px on the pistion rings which will maintain them pressed against the cylinder wall preventing ring blow by and cylinder glazing. As for after landing, keep the rpm up and allow a good cool down period (3 minutes was recomended), not necissarly to cool the engine but to allow the turbo to have a bit of a chance to cool and not get carbon ladened by the oil cooking on the bearings.