I'd like to be able to set a boost profile that is flat or increasing even, but I'm not exactly sure how to.

The attached log and graph is pretty much what I see every time, so I have to make odd adjustments to LDRXN and then make PID adjustments to keep the boost below the peaks and dips of the req. boost line.

How is ME7 coming up with the req. boost curve?  And how do I change it to something like a flat boost req. (or increasing)?  Is there a map that converts boost > load or vice versa?

Thanks!

KFURL/KFPRG

Are what I believe you are referring to.

That is the conversion from load to pressure and the answer to his question, but won't help achieve his goal.

http://nefariousmotorsports.com/forum/index.php?topic=3978.msg40306#msg40306

vpsspls_w - KFVPDKSD / KFVPDKSE
fpbrkds_w - KFPBRKNW / KFPBRK

I would start by logging the 5 variables that determine requested boost pressure to determine what and why it is causing the fluctuation.

Then you can decide if you want to make a change and where it should be applied.

For 2.7t ME7.1, this is all you need:

http://s4wiki.com/wiki/Tuning#Cam_changeover_effect_on_requested_boost

not sure about 1.8ts

NOTE IT IS A HACK.

I'm sure prj (or others) can tell you why it isn't the right thing to do

ME7 is a torque based system.
Who cares what the boost is? You are targeting a certain cylinder filling, in cold weather you need more boost, in hot weather less boost to accomplish the task. Also, you need different amounts of boost at different rpm.
The reason it is making your life so difficult, is because you are not doing what is intended.

That said, if you want to have flat boost request, just leave all the other maps, set LDRXN high and limit load through KFLDHBN (which is pressure ratio).

CAUTION! HACK!

True, I suppose my frustrations get the best of me sometimes.  PRJ (or anyone) if you had a min to look @ the .csv and let me know if you see anything out of the ordinary?  Or maybe that I should be changing my way on going about tuning ME7?  I'd be more then happy to email the file that goes along with that log.

I suppose my main issue with all this is there's so much going on, things can get tedious sometimes with the constant logging/reading/flashing cycle that can easily eat up a few hours of time for just a few minor revisions.  Compared to live tuned systems with live data (stand alone) that I'm normally used to getting direct results.

If fixing the notch is only about playing with the cam on/off and/or cylinder fill compensation then I will give that a try.  Otherwise I'll just tune around it I suppose.

I would be really curious on how to get ME7 to accept an increasing boost (keeping TQ flat) model as well, has anyone ever thought about it?  Of course normally cylinder filling/VE drops after peak TQ and adding boost is a fantastic way to keep an extremely linear TQ curve after peak.  I"m assuming this would require more then just having LDRXN end up at some retarded high figures?