Thanks for that JMP   On the 1ZZ coils are you running Falling Edge as spark trigger and this is the Dwell times I have so far 8V 6.3 ms 9V 5.3 ms 10V 4.4 ms 11V 3.8 ms 12V 3.2 ms 13V 2.7 ms 14V 2.4 ms 15V 2.2 ms