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o2 sim Question

This is a discussion on o2 sim Question within the External Engine forums, part of the LSx Technical Help Section category; When you add headers to your car, do you have to add 2 o2 sim to the front and then ...

  1. #1
    Member Camaroride32's Avatar
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    o2 sim Question

    When you add headers to your car, do you have to add 2 o2 sim to the front and then get the back tuned out, or can you just leave the stock o2 sensor in it and just get the code tuned out and not have a light? Can someone clear that up for me.

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    2-Legit-2-Quit bgable's Avatar
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    i dont think the stock front ones are long enough to work...but i know most people just get the rear O2's tuned out

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    Member Camaroride32's Avatar
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    ya i just realized that... im going to just buy the stock corvette o2 sensor... just curious do i have to buy o2 sim for front or not.... Thanks for info though...

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    you need to run o2's for the front, the sims are for the rears.

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    Member Camaroride32's Avatar
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    so your saying i dont have to buy o2 sim if i just get the car codes erased at a tune shop....

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    Senior Member Too Fast's Avatar
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    You tune out the rear two O2 sensors, you need and want the front two, so your PCM knows how to adjust your fuel/air ratio. You need O2 extensions for them, since they will be relocated with your long tube headers. You are getting long tubes, correct? And an ORY with those LT headers? No emission testing in FL, right?

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    Member Camaroride32's Avatar
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    Ok so i dont need the o2 simulators then.. I was gonna buy pacesetter Lt w/ Pacesetter ORY, then buy the corvette o2 sensors for the front, and leave the stock o2 sensors in the back. Then ill take it to a dyno shop and have them cut out the codes for the rear o2 sensors. Im right in saying i wont need o2 simulators in this case correcT? And yes there is no emission checking in florida.

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    Senior Member 01ws6er's Avatar
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    Quote Originally Posted by Camaroride32 View Post
    so your saying i dont have to buy o2 sim if i just get the car codes erased at a tune shop....
    Correct. You NEED front 02's, but the shop will just tune out the rear 02's. See, your 02 sensors read front to back (upstream to downstream) and if the reading from the back (downstream) differs too much from the front (upstream), then it'll throw a code. They just tune the rears to read within the allocated range, no matter what the temp actually is. Also, many people say that tuning them out is better than sims, because if you're having a problem (ex: running lean) they can adjust that as well, and your car will run to it's max potential.

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    Member Camaroride32's Avatar
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    Ok.... Thank you for clearing that up!!! That helps me alot

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    Member 180ls1's Avatar
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    Quote Originally Posted by Camaroride32 View Post
    Ok so i dont need the o2 simulators then.. I was gonna buy pacesetter Lt w/ Pacesetter ORY, then buy the corvette o2 sensors for the front, and leave the stock o2 sensors in the back. Then ill take it to a dyno shop and have them cut out the codes for the rear o2 sensors. Im right in saying i wont need o2 simulators in this case correcT? And yes there is no emission checking in florida.
    perfect

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    Member Camaroride32's Avatar
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    thanks for clearing some stuff up... ive got em comin this week.. ill put pics up when i get em in....

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    You'll want a tune for sure. Without the rears my AFR was like 11 to 1.

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    can someone help me out on what to do to pass the emission, my car has the engine light on, cause i put long tube headers and doesnt has catalytic converters?

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    Member Zedicous's Avatar
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    Quote Originally Posted by Camaroride32 View Post
    When you add headers to your car, do you have to add 2 o2 sim to the front and then get the back tuned out, or can you just leave the stock o2 sensor in it and just get the code tuned out and not have a light? Can someone clear that up for me.
    Your front sims adjust you mixture the rear two because your car is odb2 is only there to make sure you cat is there, nothing else. If you are running your cats you don't need them, if your not going to there is an easier way to fool your ecu than spending money on sims, cost is about ten bucks..

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