WTB: an experienced technicians help

[asshanson]

Well you're converting the airflow signal to compensate for the bigger injectors right? So the engine thinks it has about 30% less airflow than it really does? Someone correct me if I'm wrong, but I believe that will mess up your timing so you'll be more prone to knock.

[niterydr]

Originally Posted by slowboy

Well you're converting the airflow signal to compensate for the bigger injectors right? So the engine thinks it has about 30% less airflow than it really does? Someone correct me if I'm wrong, but I believe that will mess up your timing so you'll be more prone to knock.

Correct,

The reduced airflow % will lead to a lower "engine load" demand in the ecu's timing tables.

So instead of grabbing the top load row of timing values, say 11 degrees, the ecu thinks it is at 65% load and grabs 20 degrees, which will lead to detonation.

That is why it is crutial that your airflow % correction match your fuel needs as close as possible, should be +/- 15% at WOT, idealy.