I'm going to be fabbing up a top mount s372 T4 kit on my friends 335i. I am very familiar with tunerpro and EFI tuning priciples, since I have been tuning EFI systems for well over 10yrs. I have a BT cable and have read about a hidden forum on bimmerboost for the development of the open source code and XDF files. I'd love access to this information. I'll be more than willing to test different ideas and share what I learn along the way. One question I do have is: why are n54's only running roughly 10* of timing, while running boost pressures that normally would allow 20*+ of timing. I normally run over 20* until well past 10psi, on other platforms I have dyno tuned. On e85 I have ran well past 30* of timing to well past 10psi(basically NA timing values). I don't understand the low timing values used. Less than MBT would just add massive heat to the exhaust and is generally NOT GOOD FOR TURBOS. This also may be causing many of the main o2 sensor failures on ST n54's. Thank you for any insight given.
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