It means a lot to me to have you stop by my little build thread as you're definitely one of the key contributors to what motivated me to do this at all. So thank you for all your great knowledge and sharing on the matter. Just as you faced with your own build, sometimes delays are not in our control and here I am awaiting for my turbo kit to arrive still, but of course that gives me more time to plan.I've just read your thread and I can honestly say that I'm super excited to see the end results. It doesn't matter how many threads I see with guys going NA-T on their IS, it's always an exciting moment for me.
Also, just a correction with regards to the fuel system. So I was aware at the time that the stock ECU wouldn't like seeing anything more or less at the rail and of course vaccuum would cause FP to drop to around 32 PSI at idle however what I did was added a one-way check valve into the vaccuum/boost reference line and that solved that issue as a vaccuum couldn't be pulled at idle but fuel pressure would remain stable with boost giving me the full (260cc?) of injector as opposed to fuel pressure dropping by around 5 PSI in boost. I also bumped fuel pressure up to 50 PSI base just to get a bit more out of the stock injectors and the ECU was okay with that.
That being said I had run the set with both the RRFPR and the stock rail with an uprated fuel pump (And a stock pump mind you) and results were practically the same with the stock rail setup leaning out a little bit more right at the top.
No real update here, and CX Racing hasn't confirmed when the next batch of turbo kits will be ready (but I'm in the very next production group). I hope to share some good news by the end of October, but they are already about 3 weeks late from their first estimates. I know this happens, but it is still disappointing as I hoped to have the turbo kit on the car before the rainy season set in. I'll do my best once my parts come, and I've already been working with my other vendor to pick out an appropriate Precision Turbo, TIAL wastegate, and TIAL BOV, and T4 style turbo blanket to accompany the CX Racing kit.