S14 w/ S13 SR20det// rich at idle/lean on boost

[Luvs2slide]

Figured I would reach out to the oldschool (and maybe newschool) guys on Zilvia about my current issue.


Car is a 95 S14 original auto but converted to 5 speed. Built s13 SR20det (forged internals/stock new head components). Car currently running on a RS Enthalpy tuned ECU. At idle, I'm getting AFR of about 11.0 and during boost AFR is about 15.0 (this is 4th gear pulls).


Mods are pretty basic:


WS converted specific harness
RS Enthalpy tune (verified by Martin and working condition)
550 cc sti injectors (cleaned/flowtested/no leaks by Deatschwerks)
R32 GTR fuel pump
S15 turbo/boost on oem wastegate approx. 7-8 psi
JWT 260 cams
Z32 MAF
AFRs verified on new Innovate SCG-1


This is what I've tried so far:


-Two used oem FPRs both read approx. 46 psi w/ no vac & 40 w/ vac
- Sard FPR (set to 43.5 psi no vac) although I havn't adjusted it lower yet
- New Coolant temp sensor (CTS)
- New oem IACV
- mechanical Timing checked good with chain in proper position. But CAS is maxed out to achieve 15 degrees (think this still may be an issue but car runs and drives good for the most part except for the AFR stuff). Timing was checked both with the timing loop and with spark plug wire extension method along w/ disconnecting TPS
- Compression is great 150-160 psi
- TPS dialed in correctly
- Went through like 3 sets of new plugs already gapped to 0.28, most are black indicating rich condition
- CEL codes returns a 55 which means no issues
- Tried two used Z32 N62 MAFs no changes (although I'm using the ISR connector with extra ground wire. Tried grounding that wire and leaving unhooked notice about 0.5 AFR change. Although I been told to leave it disconnected to prevent ground loops.


So that's where I'm currently at. My next step is to somehow see what my fuel pressure is during boost. I have a new Walbro 255 pump coming in to see if the pump is just going bad). Other than that I'm out of ideas =/