Air Fuel Ratio question

[drdking]

I just installed a new wideband 02 sensor and after taking it for a test drive I want to make sure what I'm seeing is what I should be seeing.

At Idle it sits somewhere between 17-19,
Cruising in 4th/5th gear it goes between 14.5 and 15.5
WOT it dips to around 10.5 then comes up to around 11

I also just recently installed the splitsecond AFC, but due to issues I didn't get the 02 sensor wired before I installed it so all I have to go on is a dyno run done a few weeks ago.

[terbow]

17-19 is way to high at idle. if ur vac is ok at -21 you have a leak in the exhaust somewhere. if ur vac isnt good (-18 or less) you have a vac leak.

the other parts seem just fine.

[MS_Rick]

Sub for reference...

[jeremy1210]

I have the Apexi TT and it comes with the A/F on it which I hooked up and I have been looking at it over the past week as I drive (not sure how reliable it is compared to and actual wideband) Anway, I have noticed the similar things as DRDking.
Vac is 20-21.
When I'm just cruising it's 14-14.5.
When I WOT its 10-12.
When I let go of the gas or shift into neutral it jumps up to 18 then back down to 14 once the tach reaches idle level. Is this normal or might I have an issue as well?

[SteelWarrior]

wait what the hell....i was told before the -20 was the proper vac level without having leaks, and that -15 to -5 would be a leak

[LASERBLUE135]

sub

[lil_red_wagon]

wow, a few of you need some serious engine management. 11 is nominal and you should be hitting spikes of 14. anything too rich, you will lose power. anything too lean, zoom-zoom boom.

[LASERBLUE135]

They are confusing boost/VACUUM and a/f ratios...

vac is -20/21ish at idle, a/f???? I don't know, but people please read the thread before posting panic.