Nissan 370Z Forum - View Single Post - Why does the exhaust growl more aggressively for the first few minutes after starting

BGTV8 · 12-15-2013, 03:23 PM

Combination of slightly higher rev's and over-rich mixture whilst the engine warms-up and the catalytic converters "flashing-up" - cats don;t work until they get to ~6-800DegC and that takes a couple of minutes

12-15-2013, 03:23 PM	#4 (permalink)
BGTV8 A True Z Fanatic Join Date: Dec 2009 Location: 03350 Australia Posts: 1,514 Drives: 09 Nissan 370Z M6 Rep Power: 39973	Combination of slightly higher rev's and over-rich mixture whilst the engine warms-up and the catalytic converters "flashing-up" - cats don;t work until they get to ~6-800DegC and that takes a couple of minutes