Miss-fire after increasing the boost. Solution? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

RocketOgre · 11-29-2012, 02:04 PM

I recently fixed a long-standing wastegate issue with my GT2871R. The HKS actuator was letting the flap open no matter the signal from the vacuum line. I got a Forged actuator and I couldn't be happier. So I just went from 12psi to 19psi and have fallen in love with my motor all over again. One problem I'm getting occasional miss-fires under full-throttle only after hitting boost, usually if I start the pull at a low rpm.

I've got a JWT ECU so she runs a bit rich, AFC neo is in the works. I've got a stone stock ignition system heat range 7 NGKs and all the NGKs are probably 10k miles old. My question is this: Do I need an ignition amplifier at that boost range or should a new set of plugs fix the problem? Could how rich the JWT let's it run have something to do with it?

11-29-2012, 02:04 PM	#1
RocketOgre Leaky Injector Join Date: Nov 2010 Location: Puyallup, WA Posts: 87 Trader Rating: (1) Feedback Score: 1 reviews	Miss-fire after increasing the boost. Solution? I recently fixed a long-standing wastegate issue with my GT2871R. The HKS actuator was letting the flap open no matter the signal from the vacuum line. I got a Forged actuator and I couldn't be happier. So I just went from 12psi to 19psi and have fallen in love with my motor all over again. One problem I'm getting occasional miss-fires under full-throttle only after hitting boost, usually if I start the pull at a low rpm. I've got a JWT ECU so she runs a bit rich, AFC neo is in the works. I've got a stone stock ignition system heat range 7 NGKs and all the NGKs are probably 10k miles old. My question is this: Do I need an ignition amplifier at that boost range or should a new set of plugs fix the problem? Could how rich the JWT let's it run have something to do with it? __________________ '89 hatch DD'd SR'd 2871'd - Sold 2006 Legacy GT Wagon