Chuck84TA

Anybody have any leads on a wide band o2 sensor for ECMs running CCC qjets?

Chuck

RamIt

Is this of any help?
http://www.innovatemotorsports.com/r...eplacement.php

Chuck84TA

It sheds some light, but these are more tuning meters than actual "smart" O2 sensors.

Does anybody make a single wire wide band O2 sensor? Just the sensor that will work with our ECMs?

Some of the Bosch wide band O2 sensors I see are for 2-3 wires.

RamIt

The outputs voltage of the wide band sensor is not compatible with the narrow band as far as I know. The narrow bands only really tell you if your rich, stoic or lean.





What are you trying to accomplish?
Are you looking to have a heated o2?

Chuck84TA

I am trying to run a E4ME modified with larger idle tubes that allow more fuel in the manifold AT IDLE when the primary jets are commanded closed by the ECM because the O2 sensor is sensing a rich condition.

Sounded like a good idea but after doing that modification and getting ready for the first turn of the key sometime this month, I am thinking that I will be having issues with the
ECM

My motor is a 355 with a 226/234 roller cam that is going to stretch the capabilities of smooth idiling.

See-
https://www.thirdgen.org/forums/carb...4-cam-ccc.html

I thought a wide band O2 sensor would keep the ECM happy so as to keep the distributor from being thrown into "limp home " mode because of the over richness by the larger idle tubes ..

Am I overthinking this ?

RamIt

In that case I would for sure want a wide band gauge with narrow band output for the computer.
At least that way you will be able to see whether its rich or lean at all throttle positions and be able to make appropriate adjustments.

I plan on installing a wide band to replace the narrow band but I am running putting on a Holley and non cc hei.

Damon

Are you trying to "trick" it to accept richer idle but maintain it's tuning above that point?

If you richen up the idle, especially if you do it by opening up the IFR or the ICR (which affects the entire idle circuit, not just curb idle) the ECM is ONLY capable of attempting to hit stoich via a narrow-band input. It'll do it's best to lean it out with the MC solenoid to un-do the richening you did to again hit 14.7

You might do better if you could crack into the ECMs programming. I don't even know how much there is in there to fiddle with or if anybody has a BIN file/mask for a CC-Jet system. But my thinking is, basically, give it a commanded MC duty cycle below, say, 1500 RPMs- ignore the O2 below that point. Business as usual above that point.

Or just turn off the O2 completely and run a commanded duty cycle ALL the time. Say, 50% at anything below 3/4 throttle and 100% (or 0%- whatever full-rich is) beyond that. Then you could tune it almost like a non-CC carb.

Again, I don't even know if such a modification is possible to the programming of the carb system's ECU.

For a low-buck fix, you might simply try raising the idle speed to point the cam idles relatively smoothly and hope the stock ECM can deal with it. Say, 1000 RPM idle instead of 750.

Chuck84TA

Are you trying to "trick" it to accept richer idle but maintain it's tuning above that point?

That's what I was thinking ... I thought that a O2 sensor that sends out a "Rich" signal at a value different enough from 14.7/1 that I could run my cam.

In essence a non cc operation.

So my reasoning is this....In theory ...

With a Qjet kicking out CFM of 750 with the secondaries going full 90 degrees, it could perform better than an Edelbrock 600 and run perhaps more efficiently than a Holley.

Now I fully understand the dilemma of going non comp with a vacuum distributor versus
Playing around $$$& with the CCC qjet.

Chuck84TA

Excellent chart, by the way!