Wideband AFR at idle and WOT

phils C5 vette · 10-25-2009, 10:09 PM

What's a good idle AFR and what's a good WOT AFR

I want to double check my numbers of 14.5 at idle and 12.7 at WOT?

ive been using a tailpipe sniffer so how much differance will i see if i used the header bung?

tblu92 · 10-26-2009, 02:51 PM

Hi--there is usually about .2/.3 tenths AFR difference leaner if you measure it thru the cats and at the tailpipe--getting an accurate AFR (even with a wideband) at idle is tough as the AFR bounces all over the place--especially with a cam---

phils C5 vette · 10-28-2009, 09:06 PM

mvvette97 · 10-29-2009, 12:33 AM

with a bung in the header I like to see about 12.9 at WOT and at idle it will jump around from 14.6-15.3. Like said above with a cam the idle AFR will jump alot.