Thoughts on backfire? - ZR-1 Net Registry Forums

KILLSHOTS · 08-02-2014

As many of you know, I just went from stock catted manifolds and straight pipes to coated OBX headers (no cats) and Corsa. Sent the PROM to Marc and he removed the DFCO. Yet, this thing is backfiring like an SOB!!! It backfires loudly on nearly every upshift. Frigging embarrassing!

Bill Boudreau data-scanned the car and it is running unusually lean on deceleration. Marc says this is common with FIC injectors and says Accel are better about this. I spent enough cash installing the new FIC and I'm not changing to Accel just to "see what happens". Marc says he can add fuel on decel but isn't sure if this will fix it.

What am I missing? Do I have an exhaust leak? And if so, can an exhaust leak really cause such raucous backfiring? Can I really be the ONLY guy running headers and Corsa without cats whose mufflers are about to blow clean off the car?

TIA!

08-02-2014	#1
KILLSHOTS Join Date: Feb 2014 Location: AZ Posts: 860	Thoughts on backfire? As many of you know, I just went from stock catted manifolds and straight pipes to coated OBX headers (no cats) and Corsa. Sent the PROM to Marc and he removed the DFCO. Yet, this thing is backfiring like an SOB!!! It backfires loudly on nearly every upshift. Frigging embarrassing! Bill Boudreau data-scanned the car and it is running unusually lean on deceleration. Marc says this is common with FIC injectors and says Accel are better about this. I spent enough cash installing the new FIC and I'm not changing to Accel just to "see what happens". Marc says he can add fuel on decel but isn't sure if this will fix it. What am I missing? Do I have an exhaust leak? And if so, can an exhaust leak really cause such raucous backfiring? Can I really be the ONLY guy running headers and Corsa without cats whose mufflers are about to blow clean off the car? TIA!