Oxygen Sensor on 340 HP Exhaust

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KJoeZ61

KJoeZ61

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Has anyone install an EFI on a 340 HP exhaust car. I am trying to figure out the best location to install the bungs. Where the pipe meets the manifold it's smaller than 2-1/4" until it clears the engine compartment then goes to 2-1/4", but that's about 24" of pipe. Holley isn't very clear just saying 1-10" past the collector and that you need 18" of exhaust pipe after the bung. And I posted the same question on the Holley Sniper forum and they just gave me info for a car with headers. But they did suggest that bungs be installed on both sides so the leaner bank should be used for the permanent placement of the oxygen sensor.

Of course the sensor would be mounted at twelve o'clock, just showing the location.

InkedIMG_1844_LI.jpg
 
between 10 and 2 is fine 3 and 9 if there is no other way, it's the same as air/fuel ratio meter
 
I’m concerned about the distance from the manifold. Wouldn’t the area where it turns into 2-1/4” be about the same area the collector be on a car with headers? That’s where I’m thinking it should go.
 
When I spoke to a tech at AEM, he said about 18 inches from the head is good, but it could be a little closer if needed, that heat was mainly an issue on turbo cars. Position is mainly dictated by clearance for the sensor and wire routing, just want to keep the tip pointed below horizontal so it doesn't hold condensation.
 
It seems to me that the reason they want it 1-10” past collector is to ensure a good mixture of all the cylinders on that bank. So IMO, headers or stock manifold as long as it is 1–10” past the collector is where you want it. I just made sure in my case that I was in the said range and in a fairly accessible area.
 
Can I ask which bank you used? I was told to put a bung on each side and see which one is leaner. And to use the leaner side.
 
If you mean me, I put bungs on both sides, havent used the passenger side yet.
I can tell you if you run a plug on the other side, use some gel threadlocker, DAMHIK....
 
I don't understand why they need to be so close to the manifold. My Dakota/ Ram is nowhere near that close. They are "clear down" by the transmission
 
67Dart273 said:
I don't understand why they need to be so close to the manifold. My Dakota/ Ram is nowhere near that close. They are "clear down" by the transmission
Click to expand...
Definitely can’t answer that, my best guess would be that through testing that’s where they found it to work the best. My wife’s 01 Ram has (4) o2 sensors. (2) before the cat and (2) after the cat. The 2 before the cat are pretty close to the manifolds.
 
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