o2 sensor placement question

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mean318

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Well I just ordered a AEM wide band and I am wondering where I should place the o2 sensor. I have tti headers with 3" exhaust to the axle, and an air gap intake manifold. Would it be safe to put the o2 sensor in the h-pipe? Or should I just put it on one side just after the collector?
thanks
 
When i did my EFI I asked comp this same question & they stated in an H pipe section would not provide a true reading of the exhaust leaving the cylinders - It needs to be right after the collectors on either side.

If you want you can tap both side and check both if you feel the need.
 
DJVCUDA said:
When i did my EFI I asked comp this same question & they stated in an H pipe section would not provide a true reading of the exhaust leaving the cylinders - It needs to be right after the collectors on either side.

If you want you can tap both side and check both if you feel the need.
Click to expand...

Yep....
 
Best place is right at the collectors, between 9 and 3 o'clock. If your running a carb, one side should do it.
 
for those of you who have pictures...can you please post them?

also, is there a system that offers 2 sensors that can read from both collectors?
 
mopardude318 said:
for those of you who have pictures...can you please post them?

also, is there a system that offers 2 sensors that can read from both collectors?
Click to expand...

FAST (?) offers a device that measures all cylinders.......
 
I was asking for one sensor as I do not have the money for a dual system. Thanks for all the quick replies! I will put it on the side with the most room and convenience.
 
I have a question about this, if I may?
If you have a dual plane intake, would it be a good idea to have one on both exhausts?
Or at least have a plug so you can chk left and right banks?
 
Ideally the o2 sensor would be just a bit before the collector flange (ie, in the header). Reason being that a leak at the collector flange can screw up your readings if the sensor is behind the flange. Of course you may not want to tap your brand new TTI's for an o2 bung and burn off your nice coating welding it in, so after the flange is where a lot of them end up. Just keep in mind if you're readings don't seem to be matching up with what your engine is telling you, check the flange gasket.

Having a bung on each pipe of a dual exhaust isn't a horrible idea. You don't have to use both of them at the same time, you can plug one and use the other. Just gives you more diagnostic ability, especially with a dual plane intake. The o2 sensor will tell you more than just how to tune your fuel, it can also help diagnose ignition problems (incomplete burn), etc. If you can isolate that to one bank or the other using the o2 sensor it can help speed up troubleshooting in some cases.
 
72bluNblu said:
Ideally the o2 sensor would be just a bit before the collector flange (ie, in the header). Reason being that a leak at the collector flange can screw up your readings if the sensor is behind the flange. Of course you may not want to tap your brand new TTI's for an o2 bung and burn off your nice coating welding it in, so after the flange is where a lot of them end up. Just keep in mind if you're readings don't seem to be matching up with what your engine is telling you, check the flange gasket.

Having a bung on each pipe of a dual exhaust isn't a horrible idea. You don't have to use both of them at the same time, you can plug one and use the other. Just gives you more diagnostic ability, especially with a dual plane intake. The o2 sensor will tell you more than just how to tune your fuel, it can also help diagnose ignition problems (incomplete burn), etc. If you can isolate that to one bank or the other using the o2 sensor it can help speed up troubleshooting in some cases.
Click to expand...

Good point, I will consider putting in a second bung for the other side! Thanks :thumbrig:
 
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