SCratching my head on this. Spark blow out? Options

[natedogg]

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.

This has not been the case on my car. Granted I am usually tuning on 100 octane. But even tuning Dan's car on pump gas shows that the more timing we got without knock leads to more power. Its easy to feel in the seat of the pants.

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.

As the boost gets higher and the fuel curve more agressive we have more matter to burn in the combustion chamber and therefore need to advance the timing to burn all of it efficiently. The stock ECU isn't built to do this, so in part I do agree with your last statement. It was built for a 200 hp car. If you ever get a chance get on evolutionm.net and pm Buschur how much timing he runs with his AEM unit at the 40+ pounds of boost that he runs on his race car. I can't make any guarantees, but I bet you its 30 degrees of advance or higher.