Another Supercharger Idle problem thread | Starting to get desperate

[NissanTracker]

Hey, Seb is doing me a solid and helping me on my idle issue. It is definitely something with the Z, not tuner related.

I believe these issues are all connected, but can't figure it out. I experienced very similar behavior on the on the stock A-W Stillen setup. I am also seeing this on the A-A kit. Pulling my hair out... almost 2 years with these idle issues.

Z never had idle problems before the supercharger install at 50K miles. Has 60K now. I did the install myself. I'm on the mid-experienced level "mechanics" wise. Full lift at home, had multiple projects in the past.

1) On cold start, sits at 900-950 with no issue. When things start to heat up, after some long driving, idle goes above 1,100-1,200 and can't seem to get it down.

2) When I put the clutch down while rolling to a stop, the idle surges between 950-1200. When I finally do stop, it takes a bit to come down.

3) If I free rev, as the revs come down, stops at 1,500-2K and "blurps" (stops, momentary rise, then falls). I feel this is related to above

Attached some VIDS:

High HOT idle:
https://drive.google.com/file/d/1rzc...ew?usp=sharing

Idle Surge while rolling to stop:
https://drive.google.com/file/d/1rs8...ew?usp=sharing

Descending Idle "blurp":
https://drive.google.com/file/d/1tnO...ew?usp=sharing


THINGS DONE SO FAR:

Boost leak done and what was found was addressed. Tried idle relearn but when it's hot, I can't complete because it is high.

Leakdown test ~8%.

Also, I went through some threads and some mention that the A-A kit "Deletes" the PCV. Is the actual PCV fitting replaced with a straight through fitting and then vented to atmosphere? I kept my PCV on but just vented to atmosphere.

Throttle-bodies were replaced with new ones

Supporting mods:


350z HR Nismo (MAF Tuning w/UPREV)
Uprev GT MAFs
A-A kit with 1.5" recirc Tial (on a filter)
Stock clutch/flywheel
Motordyne TDX
Stock Cats
9lb pulley (seeing almost 10psi)
Venting PCV to atmosphere through a mishimoto catch can
ID1050X injectors
Walbro 255 fuel pump(modified in-tank regulator)
Mishimoto T-stat
OEM 370z plugs (1+ step colder for 350zHR, gapped .032)