AFR sensor placement?
Thread Starter
Teching In
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From: Burn out Box
AFR sensor placement? Just recieved a new AFX Air-Fuel Ratio Monitor.
I was wondering, where is the best place to install the sensor.
I have a 2000 Camaro LS1 with LT's into a y pipe. It ends there.
Manual says:
The AFR sensor should be located between 12” and 48” from the engine, upstream of any catalyst device if so equipped. The closer the sensor is to the engine, the more likely it will be overheated, possibly shortening its life. The further it is from the engine, the more likely condensed water will get into the sensor and thermally shock it, again possibly shortening its life. The sensor should be mounted at least ten exhaust diameters upstream of the exhaust exit (ex. for a 3” exhaust pipe, that is 30”). If the sensor is mounted between one and ten exhaust diameters from the exhaust exit, the AFR measured will be leaner than the actual AFR by as much as 2 AFR at low engine speeds (i.e. less than 3000 rpm).
Since I stop at the Y pipe I may need to add more pipe to keep 25"-30" from the end.
What do you guys think?
Thanks in advance
I was wondering, where is the best place to install the sensor.
I have a 2000 Camaro LS1 with LT's into a y pipe. It ends there.
Manual says:
The AFR sensor should be located between 12” and 48” from the engine, upstream of any catalyst device if so equipped. The closer the sensor is to the engine, the more likely it will be overheated, possibly shortening its life. The further it is from the engine, the more likely condensed water will get into the sensor and thermally shock it, again possibly shortening its life. The sensor should be mounted at least ten exhaust diameters upstream of the exhaust exit (ex. for a 3” exhaust pipe, that is 30”). If the sensor is mounted between one and ten exhaust diameters from the exhaust exit, the AFR measured will be leaner than the actual AFR by as much as 2 AFR at low engine speeds (i.e. less than 3000 rpm).
Since I stop at the Y pipe I may need to add more pipe to keep 25"-30" from the end.
What do you guys think?
Thanks in advance
Thread Starter
Teching In
Joined: Feb 2012
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From: Burn out Box
Dont you want the sensor after the Y? So it reads both sides after they come together. You would'nt want to read just 1 side would you?
Manual said 12"-48" fron engine. I would guess this would push the 48" side of the rules.
The complete exhaust is only LT's and a Y Pipe.
Thanks
Manual said 12"-48" fron engine. I would guess this would push the 48" side of the rules.
The complete exhaust is only LT's and a Y Pipe.
Thanks
Dont you want the sensor after the Y? So it reads both sides after they come together. You would'nt want to read just 1 side would you?
If you don't have cats you can put it in the Y pipe, it will just be slower to react that far away from the engine. Good for tuning.
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Brett Foote Thread Starter
Teching In
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From: Burn out Box
I want to be sure before I drill a hole.
I was thinking about putting it here. This would put it on the left/drivers side.
It would be easy to put that pipe on the bench to weld the bung.
Plus I don't have to drill a header.
The easy way is most likely not the best way. LOL
Any reason not to do it this way? Or is there a better place?
Thanks
I was thinking about putting it here. This would put it on the left/drivers side.
It would be easy to put that pipe on the bench to weld the bung.
Plus I don't have to drill a header.
The easy way is most likely not the best way. LOL
Any reason not to do it this way? Or is there a better place?
Thanks
LOL............ I should start a poll.
I got
1 at any where you want
1 at left side
1 at right side
I got
1 at any where you want
1 at left side
1 at right side
How accurate and how fast acting you want it to be depends on the location, so choose what is the most important to you.
Most people put it in the driver's side right after the collector because it offers the most benefits: fast acting due to proximity of the engine, accurate because it's before any cats and it's a good way to protect your leanest cylinder (#7).
Putting it in the passenger side takes away the lean cylinder monitoring. Putting it further in the exhaust makes it slightly less accurate (if you have cats) and slower to respond.
Thread Starter
Teching In
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From: Burn out Box
Great guys........... Thank You.
This breaks the 3 way tie.
I will go with the picture. That is a nice 12"-18" drivers side section I can pull out and take into the shop. I don't think it is pre drilled.
I just wanted to make sure I was puttng it in the best, most popular place.
Thanks Again
This breaks the 3 way tie.
I will go with the picture. That is a nice 12"-18" drivers side section I can pull out and take into the shop. I don't think it is pre drilled.
I just wanted to make sure I was puttng it in the best, most popular place.
Thanks Again
Redtan hit it dead on. It's a game of trade offs.
Not that it pertains to you, but possibly for future readers, post turbo as manifold pressure also skews the reading.
Oh, and don't put it below 90 degrees. Else it becomes more exposed to moisture or pooling condensation which increases the likelihood of cracking the heating element. Don't ask how I figured this out 3 short lived sensors later.
Not that it pertains to you, but possibly for future readers, post turbo as manifold pressure also skews the reading.
Oh, and don't put it below 90 degrees. Else it becomes more exposed to moisture or pooling condensation which increases the likelihood of cracking the heating element. Don't ask how I figured this out 3 short lived sensors later.
