Done some logs tonight and took the car to T8 B5 and she was flying my temps when gunning it didnt go over 19 degrees and in places saw as low as 12 degrees, high up the rev range there is no timing pull back only low down the rev range. Am i doing any major harm to my engine by keeping it on timing 8 or is it worth lowering to say 6 and on special occasions turn it up to 8 or even 9?