I've recently jumped into re-tuning my 05LGT. I'm no stranger to ECU tuning in general, as I've modified my 1st gen Integra's ECU a number of times. However, this is my first shot at an OBD-2 ECU.
The problem I'm having is with low boost and oddly low WDC (logged). My Initial duty cycle is now at 85% with a max at 90% (high, I know but I started out lower but couldn't hit targets).
In looking at the logs for 3rd gear pull, the WDC starts out at 86.67% at 2100RPM (good so far) but begins tapering DOWN to 30.2%@2722-3372RPM. After 3372RPM i starts rising (slowly) to 85% by 5500RPM. Nowhere in my maps does it have anything as low as 30.2% and it's killing my boost to 10PSI max (turbo doesn't recover well after WDC begins rising again). It does seem to learn around the low WDC somewhat, but it will probably take a long time to get to the desired 70-90% to achieve target boost of ~17psi. The wierd thing is that the boost is pretty flat once it hits 10psi.
This doesn't feel like a boost leak, as I've already had the vacuum line under the intercooler blow off. It idles great and is smooth over the rev range, just not as powerful as with the MBC set at 16PSI.
I wanted to go back to ECU control to get around the goofy overboosting that comes with a MBC and to allow more fine control over boost.
The only difference over the stock map is that I used the A2WC522N as the base code then made my changes. My ECU is probably a pre-521N map base, so this was a considerable upgrade.
I also have non-Zero entries in the Low Speed Boost Compensation tables, per the OSECU Stage 1 map. I haven't tried it without any entries in those tables to see if that quells the problem, but I don't see why that would cause a problem.
I've attached a graph showing WDC and boost in a 3rd gear pull. Any ideas? Do I just have to wait for it to learn?