Swamped at work, hence the radio silence.
Been tuning driveability at low throttle, acceleration areas, since the new injectors introduced the stumble again, given the significantly higher amount of fuel. I've found the spreadsheet tools are not helpful when tuning these areas, since they are not in closed loop, and the short and long term trims don't come into play. Using a wideband to calculate target versus actual errors helps, but if you simply plug those figures into the spreasheets, even after filtering, you get some very large (and incorrect) numbers. So yeah, been doing it manually - split off RPM areas at various boost zones, and actually look at what the actual to targeted errors are, and make slow adjustments to the compensation tables. Pain in the ass, but works better I'm finding.
I've had to loosen up my dual port recirculating BOV since I was getting some surge when letting go of the throttle at high RPMs, had to turn the turbosmart 40 a full two turns to really have an impact. Problem now, is I'm getting rich spots between shifts (with the characteristic pops) which is annoying. I'm thinking of going BPV again - but I'll need an aftermarket, since I'm running 24 / 25 Psi now, and will run more likely. Any suggestions in terms of make?
I guess the other question I should ask is whether a little bit of surge is really a problem with a big ass turbo - with the valve fully closed, I get it at most RPM range with rapid deceleration, but for a very short duration, 1/2 second at most. A lot less annoying than backfires.
