With a 1993 LT1 with a Solid Roller 383 when you have it dyno tuned would it even be necessary to run the stock o2 sensors? You could just run a Wideband and watch it but with something pretty extreme setup would a stock o2 even be useful because the motor would already be dyno tuned so it shouldn't run lean or rich.

 

The O2 sensors are not used at WOT (enrichment mode), but are used during part throttle driving during closed loop.

 

unless you run an open loop tune, which is not uncommon

 

Well if I don't hook them up won't the motor run off the VE Table? VE table being Map VS Rpm

 

Wouldn't this be better? Because of the cam being so big that the overlap on the cam will mess with o2 readings right?

 

overlap messes with MAP readings, not so much O2 readings

 

Big cams make less vaccum at idle

 

Im running mine unplugged, runs better part throttle untill i can get a better tune. Itll run richer and get worse gas mileage in most cases.

 

I thought the O2's weren't used because they cannot respond quick enough at WOT rpm ramp rates.

 

Your speed-density 93 ALWAYS has to use the VE tables. That's how it calculates the "speed" portion of the mass air flow determination. (RPM/2 X displacement X VE = volume air flow). By unhooking the O2 sensors, the ECM runs in open loop, simply meaning the ECM has absolutely no way to know if it is calculating the fuel flow correctly, and no way to correct for inherent errors in the assumptions it makes to do the calculations. If you are running the ECM with an open loop tune, the VE tables will need to be verified as part of the tune, and you can NOT make any changes to the engine configuration that alter VE, or the tune is no longer valid, and there's no O2 feedback to allow the ECM make the correction.

The stock narrow-band O2 sensors are only accurate at the stoichiometric A/F ratio used in closed loop (14.7:1). Since WOT requires a much richer mixture to make peak power and torque, the O2 sensors aren't capable of providing accurate feedback, hence are not used. It has nothing to do with the response time.

 

Well I think what I am going to do is get a Wideband O2 and just tap that into the ecm also. And put a pipe plug in the other header o2 bung.

 

You will need a wide-band controller, with a stock OEM narrow-band output emulator. A wide band runs 0-5 volts, the PCM is looking for a 0-1 volt signal from the OEM narrow-band sensor.

When you get done, you will have only one bank of the engine in control... what do you expect will happen on the bank without an O2 sensor? With one sensor "out", the ECM is still going to be operating in open loop.

 

Well I could hook one Narrow Band o2 sensor in one bank, then I could hook the wide band up on the other bank because on the 93 ecm is batch fire so that one stock NB o2 thats hooked up will tell the ecm what to do with fuel since it changes all injectors at the same time right? ....Does the 93 computer have 1 or 2 o2 connectors?

 

You really need to learn a bit more about your car and engine, before you start dreaming up these schemes to change things around. Yes it is batch fire.... the four injectors on each bank of the engine fire at the same time, controlled by the O2 sensor for that side of the engine. The 93 ECM has a seaparate "connector" for each of two O2 sensors, and a separate "connector" for each of two banks of injectors. Each bank of the engine is independantly controlled.

 

Then I could run a narrow band in one header and then put the wide band in the other and tap it into the ecm so its used for both a/f ratio and tells the ecm what to do.