At 3500 RPM's....

**Mr. Luos** · 01-21-2006, 05:47 PM

What should the O2 voltage readings be if stoich?

I would go higher...but the motor is brand new. And I would like to know what they are reading....

**ninobrn99** · 01-22-2006, 09:37 AM

if you havent entered PE, then it should be stoich from what i gather. its only when your in PE or OL that you will see a difference in A/F. someone correct me if im wrong.

**Mr. Luos** · 01-22-2006, 05:32 PM

I have voltage readings...probably not the most accurate...but should at least give me an idea how rich it is.
At least that is how I took it.
Maybe I am wrong.

**foff667** · 01-22-2006, 07:08 PM

your stock o2's will/should switch back and forth anywhere between 0-1000mv at idle & part throttle.

**Mr. Luos** · 01-23-2006, 03:05 PM

Originally Posted by foff667

your stock o2's will/should switch back and forth anywhere between 0-1000mv at idle & part throttle.

I know.

What about WOT at 3500-5500 RPM's??

**foff667** · 01-23-2006, 03:34 PM

750-1000mv is normal.

**Mr. Luos** · 01-23-2006, 03:40 PM

Alright then...those look good.
Must be something else.

**Mr. Luos** · 01-23-2006, 04:48 PM

Actually...thinking about it...

Don't I want my O2's right around .920mV at WOT??

**foff667** · 01-24-2006, 09:03 AM

stock o2's are completely innaccurate at any a/f ratio other then 14.7:1 so at .920 one car might be running at 13.0:1 and in another it might be 11.5:1...and those numbers could change from run to run & day to day. So the answer is no...using stock o2's give you no accurate info.

**Mr. Luos** · 01-24-2006, 02:27 PM

Okay...but at the very least...they shouldn't being varying in voltage at WOT should they?

**GatorSS** · 01-24-2006, 08:03 PM

Originally Posted by foff667

stock o2's are completely innaccurate at any a/f ratio other then 14.7:1 so at .920 one car might be running at 13.0:1 and in another it might be 11.5:1...and those numbers could change from run to run & day to day. So the answer is no...using stock o2's give you no accurate info.

Stock O2s are crap for info. Learned that the hard way.

**foff667** · 01-25-2006, 06:22 AM

Originally Posted by Mr. Luos

Okay...but at the very least...they shouldn't being varying in voltage at WOT should they?

they will/should move only slightly ie 850-900mv or 900-950, etc. But generally no they shouldnt fluxuate...not in fbodies at least...lsx trucks are a whole different story.

**Mr. Luos** · 01-27-2006, 08:02 PM

Screw it....these stockers have been through hell.

2002 C5 rears are ordered.

**hammertime** · 01-29-2006, 09:25 AM

Ideally, you should use a wideband O2 sensor for tuning purposes. It can read the A/F ratio much more accurately than any stock type sensor.

Cyles in a small range for the stock sensor is normal, but the farther away from stoich you get, the less accurate the sensor is.

**Mr. Luos** · 01-29-2006, 09:43 AM

I want to put a wideband on it eventually...just can't afford it right now. Maybe depending on tax refund.

I was looking at my log file compared to a couple others and my O2's are acting much different. They seem to be 'lazy' and bounce around too much for my liking at WOT.

I get the Delco C5 rears tomorrow.