firehawk00

Aside from poor around town drivability, what are the effects of having the front o2 sensors disconnected? At WOT does the computer read off of the O2's or does it have a set program. If your asking why I would have the O2's disconnected, it's because I recently installed LT headers and the company I bought them from sent be the wrong O2 extensions.

Black LS1 T/A

Don't do it... trust me on this.

PCMFORLESS

The car cannot run closed loop without the front O2's. You will want to run front O2's for sure. The O2's are not looked at by the PCM for WOT at all, but all of part throttle closed loop operation depends on them.

Bink

Or...... if you have an Editor, such as LS1Edit or HP Tuners, set the "Closed Loop Enable Temp" to 180*C across the board and you'll be Open Loop full time.
joel

NoGo

iTrader: (2)

I havent had any O2's on my car for over a year.......

You can pull them, but you will need to properly tune your car to live without them. On the stock tune your car will run like trash.

SidewayzOZ

iTrader: (11)

Make your own extensions...its just wires. I used 16 or 18 guage wire (cant remember) and taped it up real good.

Navy David SS

iTrader: (13)

Blink/NoGo -- how would you "properly" tune a car to delete the 02's? Just set the temp to 180? What would the O2's on A-tap do? I "thought" the O2's show rich/lean conditions at WOT?

David

horist

TTT i'm int too

Bink

Hmmmm.....properly?
Best to have a Wideband O2 setup for tuning on the street. Also will need a scanner (EFILive V6) and Editor.
If car is modded ( more than simple bolt ons) calculate a new ve table. Disconnect the O2s and disable all related DTCs.
Part throttle fueling, at operating temps, should ideally match the F/A table (Stoich) in LS1Edit. You'll probably need to tweak multiple tables to get it close/right.
WOT fueling 12.9 - 13.1 AFR on the street or a little richer on a dyno (much more efficient and safer on a dyno).
As you go through the process post questions here......that's what I've done. In fact everything can be found here -> do a search of all of NoGo's posts...all of it he has posted in the past. His posts are a tuning education in and of themselves!!

WOT - the O2 sensors are ignored by the PCM. However, if LTFTs (average of LTFTs ) are positive then this % will be added to WOT fueling - if negative they will not be subtracted. This is the reasoning behind negative fuel trims at part throttle....it makes WOT fueling (AFR) more predictable and stable. The WOT target for fueling is the PE/RPM and PE/Temp tables.

Hope this helps some.

joel