[leman_opc]

Such a nice thread and immense portion of knowledge I'll have to structure somehow in my head.

Anyway, having considered the effect of pre-turbo injection for my setup I decided to give it a go with the primary objective to increase the efficiency of the turbo compressor. To get a feeling on how the pre-turbo injection may work out in my case I'm currently planning to install additional jet pre-turbo (now running single jet post-IC for knock suppression reasons primarily) via a tee to existing line (post PWM valve). Would appreciate a practical advice from the people here.

In my setup I currently use single 0,8mm jet flowing ca. 420cc/min bearing in mind ca. 1,5 bar max boost I have. Is this a good idea to go with a 0,3 mm jet pre turbo, and change the post-IC jet to 0,5 (i.e. basically reallocate what I’m injecting now) or should I rather consider adding another jet on top of what I have?

Also, my system now is referenced to IDC (progressive). Based on my reading here I note that most people reference the pre-turbo injection to boost, which is reasonable given the amount should correlate with air mass rather than fuel. Is there a high chance I face any issues here due to changing AFR across the map?