Originally Posted by
Chip
If you do that on big boost, you will end up with high EGT's as a result.
Ahhh of course
Yes, but if you end up retarding the timing too much the power you are losing is because the burn hasnt happened quickly enough in the cycle so the energy ends up as heat rather than used to push the piston down.
Sorry, good point. I really meant retarding the timing to with in reason. CR and advance is still a bit of a compromise as far as i can see. As you have said above, lowering the compression ratio and advancing the timing will reduce egt's, but too much and you just loose power/drivability and make for a generally less efficient engine.