Contour Enthusiasts Group Archives Forums Modifications Forced Induction Turboing my focus swap

The bigger MAF and bigger injectors mess up your timing tables, giving you MORE timing. Something you don't want under boost.

Don't put your stock injectors back on just your stock MAF. I don't think the AFC can compensate for a bigger MAF and you don't know exactly how the bigger MAF affects the voltage signal either. Use the SAFC or your fuel pressure regulator to get the injectors to give you the proper fuel. That still won't be perfect, but it will be better than having both a bigger MAF and injectors.

Currently I am using the safc to increase the fuel because of the bigger MAF, unfortunately the bigger MAF does advance timing. I am wondering if the timing is based on the airflow signal wire that is modified by the safc or a seperate function altogether. The reason being is if the safc is increasing signal voltage to compensate for a bigger MAF and if the timing is also based off of that signal then shouldn't the timing values be lowered as well? That might explain why I haven't had any pinging yet. The system isn't excessively rich either so I know that isn't keeping it from pinging. Just a thought. Unfortunately even if the timing values are being adjusted with the MAF signal wire the bigger injectors don't require that the signal be modified enough to bring the values back to stock. Just a thought.

any pics yet???