Hi all,
I'm just getting started tuning my 1.8T.  I've been messing around with a few different stage 1 files floating around.  After increasing KFMIRL and LDRXN i'm seeing requested boost and load about where i want it.  I don't have the logs in front of me, but for most of the RPM range about 20psi was the requested boost and actual boost was hovering right at 17.5psi.  Load numbers were similar (i forget numbers) -- something like request 205 and actual 190 (those numbers could be way off, but it was very consistently not achieving the request).  This could just be a limitation of the turbo, or a boost leak or something.  My question is, if i'm logging a requested PSI of 20psi, then there's nothing else that could be holding it back from the ECU, right?  E.G. -- if the ECU were to intervene, requested boost and load would go down, right?


As i'm writing this, i'm wondering if maybe the ECU was pulling timing.  Would that cause a drop in boost possibly?  I'll have to check the logs...  Although i never saw a boost spike.  4th gear pull it went right to 17.5psi and held there most of the RPM range.

Thanks for any help!  (and sorry if these are dumb questions)

Thanks for the info.  I think this was set at 3.89 across the board (again, don't have it in front of me), which i don't think would cause a problem, right?

Yes, i haven't changed KFMIOP yet.  It's my understanding (and correct me if I'm wrong), that basically a change to KFMIRL for full throttle will not necessary need a change to KFMIOP as anything past it's axis limit will just follow the highest values.  Is that correct?  I was having part throttle problems with the other stage1 1.8t file in the tuned files section and i think that's because the KFMIOP axis wasn't scaled.  I don't think that's what's limiting me in this case though, but obviously my understanding could be way off.

BTW -- this is the file i'm working off right now:
http://nefariousmotorsports.com/forum/index.php?topic=1272.0title=

Thank you! -- I think that indicates a mechanical problem (e.g. boost leak) or simply that the turbo can't hit requested boost. 

Don't have logs at the moment, but i'm 99% sure it was at 100WGDC.  Would that make sense?  I've been very confused in my reading as to whether 100% WGDC would be completely shutting off pressure to the wastegate or allowing 100% of pressure to wastegate. 

thanks very much for the clarification!  I'll have to look at the logged values again.  Is the 95% limit associated with KFLDIMX -- e.g. if KFLDIMX is at 100, can the WGDC reach 100?  I thought i saw 100 in KFLDIMX, but i've been looking at a load of files recently and may be getting some things mixed up.

06a906032dl running 06a906032hn bin. Though I believe it's actually HS disguised as HN according some info in the tuned file thread.

 :)The max boost is always limited by the highest value in KFMIOP load axis. Reading 17.5 psi boost means 191.5 load.
You need to rescale load axis in KFMIOP for moore boost (20 psi  ~ 208 load) and adjust torque values to match KFMIRL request loads.