NefMoto

I'm missing something in my tune. stock turbos, stock fueling, b5 s4 mbox.
my n75 is cutting duty cycle at 6000rpms for some reason... I'm having trouble narrowing it down.
What map should i concentrate on other than kfldimx?

something is telling the n75 to cut duty cycle
here are logs and the bin.
the only code is negative deviation.

Is it cutting duty to match a lower requested boost? Or is requested boost still higher than actual and duty is being cut away?

Requested boost is never met, actual is lower the whole time.

look at KFLDHBN. I'm not sure is that limit is reflected requested or not. I thought it was,but worth a look.

I have this map adjusted to 2.4 or there about at red line, maybe I'll set it all to 3 to see if that's the issue

that was not the cause.
my 93 octane revision is doing it as well, but at 6000 rpms.

Do you have diagnostic codes in your fault memory?

I will check, this happened in a couple different cars, and a couple cars haven't had an issue .  These are all people testing my file, so its not my car.

I'll go over your file this evening after work.

Rick

I haven't looked at your tune yet. But did you raise the maximum compressor pressure ratio?

Yes... I even raised it to 3 across the board and tested to see if that was the issue. No dice.

According to your logs, the specified boost pressure is good, and the specified load is good, and the N75 duty cycle is between 92% and 95% up until 6000rpm. Above 6000rpm the N75 duty cycle drops off, but the specified load and specified boost pressure still stay high, and the throttle valve is even staying at 100%.

Could it be that you are outside the efficiency zone of the turbo at this point?

Even if it was.outside its efficiency, wouldn't the n75 continue to function to allow requested load

I will messing with ldrxn up around 6k rpms to see if that will fix it. Thanks for the ideas.

You're right, in that case the N75 duty cycle shouldn't be dropping.

it could be dropping due to the negative deviation code, but i would think that requested load would drop as well.
i've adjusted ldrxn to see if that could be the issue... i'll post back after testing.

I significantly lowered ldrxn starting at 5800 rpms... that map is not the cause of this issue. Any other ideas?

Do you get diagnostic codes? Does the actual boost ever meet the requested?
Post some more logs.
With that requested boost in the upper rpms you will kill the k03s pretty quick due to overspinning them.

Edit: Ok I've just read that you get negative deviation. That's the reason because you never reach the requested boost. The Ecu will ignore that for the time calibrated in TDLDRA but then cuts the DC to the N75.

this explains the n75 cut then... I will try another ldrxn change... i've done a few changes to that map with no success. I'll see what i can cook up.
thanks.

Try to keep the difference between requested and actual boost below 100 hPa because that's the threshold (EDLDRP) for the diagnoses.

ok thank you... i wasn't sure which map controled this function. i went through the logs, modified ldrxn again back to sane levels and sent the file out for testing. 
thanks for the reality check.... kind of along the lines of what tony was getting at.

as above, reduce max load.  Also consider bumping up aiflow limit of MAF but you are probably below it on KO3's.

Rick

Thank you, load is being reduced... I will look at the compressor map and determine max flow.

issue fixed... thanks guys

can you tell what was solution?

As everyone pointed out i was requesting too much load.
i also loosened up edlrp a bit.

You mean EDLDRP?

Edit: Nevermind, it was written like that a few posts up^^^^