Dual exhaust and O2 sensor?

[dremu]

Converted my truck to TBI (Howell kit), with heated O2 sensor. Occurred to me that the sensor will only see the exhaust on the one side, as I have true dual exhaust, no crossover pipe (H-pipe, X-pipe, whatever you wanna call it.)

Will this effect things, like does the sensor need to see both sides to get the right amount of whatever it is exactly it measures, or is seeing the one bank enough 'cuz the TBI just dumps fuel into the both (more or less) equally anyway?

-- A

 

[black dawg]

It will be fine, very few of the tbi setups had o2s after the Y.

 

[dyeager535]

Yep, will be fine. The manifold/injectors don't feed just one side of the motor anyway, only issue would be if you have something mechanically wrong with the opposite bank (bad wire/plug/valve/piston/rings) that the O2 would otherwise see.

 

[dremu]

Okay, cool. I didn't know if it measured actual flow of oxygens, or just the ratio of oxygens to eels or whatever else is in there.

I can say she runs a damn sight better on TBI than the carb ever did, but figured I'd make sure the TBI was getting all the right inputs.

-- A

 

[Greg72]

Okay, cool. I didn't know if it measured actual flow of oxygens, or just the ratio of oxygens to eels or whatever else is in there.

I can say she runs a damn sight better on TBI than the carb ever did, but figured I'd make sure the TBI was getting all the right inputs.

-- A

During my recent phone call with the Holley tech about EFI, I asked a similar question about adding a 2nd O2 sensor to the system as an option so that I could monitor both banks. He basically said "why bother?" You can't do anything in a TBI to affect one bank of cylinders anyway.....

Still... If you were doing datalogging or had the ability to notify the driver about a lean condition on one bank, it might help save the motor from burning a piston.

-G

 

[dremu]

Sounds like Might As Well-itis creeping in

-- A

 

[Greg72]

Sounds like Might As Well-itis creeping in

-- A

Put a Raspberry Pi on it!!

Some kind of electronic latching circuit that triggers a dashboard warning light when the A/F ratio exceeds 16:1 (or whatever)...

You could get crazier and have it pull timing, or who knows?

-G

 

[paratrooper307]

I've got the same setup on my exhaust, works just fine.

 

[dyeager535]

Again since the O2 sensor is "seeing" the same mixture as is getting to three other cylinders, two(?) on the opposite bank, no way one cylinder could ever run lean. Nothing changes the mixture but amount of air coming into the motor, and the injectors. Can't think of any way one cylinder alone could run lean.

When I broke a rocker arm stud, I knew something was wrong long before the O2 sensor figured it out.

GM thought monitoring one bank was adequate for at least a decade, and they had to warranty the things.

 

[paratrooper307]

Only in multipoint systems is there any benefit to measuring each bank, since only with individual injectors can you alter the mixture in each cylinder or each bank. A TBI is basically an electronic carburetor, where the fuel and air is atomized at a central location and then distributed to the individual cylinders.

 

[Blue85]

I would rather have the sensor on one side up close where it's hot and quick, than move it back to capture both banks.