SCratching my head on this. Spark blow out? Options

[ncgalant]

As long as he's not seeing knock this is not a problem. And if he does start to knock he will see less timing, because the ECU will pull it. The more timing advance I get, the better my car runs. When you are running lots of fuel, you need more ignition timing to fully burn the mixture.

I agree. Its just that when pulling out 40% of the airflow, if you don't show enough air to the computer to get it back into the stock ranges it gives way to much timing. I personally was getting 30 degrees of timing by 6000 before I learned how to tune for the timing I wanted. Granted this was at 12psi, but such high timing on pump gas and higher boost will lead to a very poor running car. Sure one can cover the problem with more fuel like I tried to, but in the end, this leads to many problems.

Nc, I think you should spend some time logging a 1G and watch the dependencies of timing on the knock curve. It may give you some insights as to why you run less timing when you run leaner. The timing curve is not based on airflow alone.

It is based on airflow alone if you never knock. I understand that knock is going to stop or retard timing advance. I also know that the octane variable keeps track of that.

Basicly, I'm saying the same thing I've said all along. As the boost gets higher, the timing should get lower. For the most part the ECU's maps take care of this. Large injectors with an ECU not made for those injectors just throw the ECU's maps way out of wack.