Need help, S15 SR20 running very rich. Cutting out after 5k RPM - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

adub1992 · 12-06-2014, 12:17 PM

Alright. So I have an S14 with an S15 motor swap, stock S15 turbo, Z32 MAF, 550 cc injectors, splitfire coils, Nistune type 4 ECU, Wally 255 fuel pump, big FMIC, other stuff that doesn't seem relevant right now. The thing always runs rich. Coasting to a stop, the AFR reads sub 10's but will eventually climb to about 13 if it sits long enough. under any kind of load, it reads 11s and 10s and just reads 10.0 (likely below that though) at anything past about a quarter throttle. At WOT it cuts out at around 5 K RPM's. I've tried messing with the nistune a little, resized the injectors and changed the MAF. The K Value reads about 23 grand but it still runs super rich. I'm just completely out of ideas. Anyone have any thoughts?

12-06-2014, 12:17 PM	#1
adub1992 Join Date: Oct 2012 Location: Fort Bragg, NC Age: 31 Posts: 19 Trader Rating: (0) Feedback Score: 0 reviews	Need help, S15 SR20 running very rich. Cutting out after 5k RPM Alright. So I have an S14 with an S15 motor swap, stock S15 turbo, Z32 MAF, 550 cc injectors, splitfire coils, Nistune type 4 ECU, Wally 255 fuel pump, big FMIC, other stuff that doesn't seem relevant right now. The thing always runs rich. Coasting to a stop, the AFR reads sub 10's but will eventually climb to about 13 if it sits long enough. under any kind of load, it reads 11s and 10s and just reads 10.0 (likely below that though) at anything past about a quarter throttle. At WOT it cuts out at around 5 K RPM's. I've tried messing with the nistune a little, resized the injectors and changed the MAF. The K Value reads about 23 grand but it still runs super rich. I'm just completely out of ideas. Anyone have any thoughts? __________________ '86 Z31 NA, 95 S14 w/ S15 swap