O2 Sensor Failure - Heat and Leaded Fuel
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O2 Sensor Failure - Heat and Leaded Fuel

  1. #1
    149 BGJ-Willis Power 540 willis's Avatar
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    Default O2 Sensor Failure - Heat and Leaded Fuel

    Hello People,

    What was the brand name

    At what exhaust temp does sensor failure occur?

    Has leaded fuel been an issue in faulty readings?

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  3. #2
    Senior Member Woods 017's Avatar
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    Quote Originally Posted by willis View Post
    Hello People,

    What was the brand name

    At what exhaust temp does sensor failure occur?

    Has leaded fuel been an issue in faulty readings?
    I think most guys are running a Bosch Wide band 02 sensor with a Daytona sensors controller. As far as temperature goes I am not sure but I would imagine that it is pretty high. From my understanding leaded fuel will not cause a faulty reading but is hard on the sensors. Most guys will pull the sensors out when warming up the motor to try and make them live longer.

    What are you having trouble with?

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    Senior Member STV_Keith's Avatar
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    Dynojet uses a Bosch LSU4.2 sensor for the Wideband Commander and WideBand2 devices. This sensor has a max temp at the element of 1030*C (1886*F). Depending on lead content, the sensor life is degraded up to 90%. See 7.2 on page 16 of the tech sheet.
    Attached Files Attached Files
    Keith-


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    Amber Racing Services BUSBY's Avatar
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    Willis ... from trick tuners:

    "Usually a temperature of 1800F (982C) is considered to be the max upper limit and is too hot for nearly any combination. Steel will take on a reddish tint and begin to slightly soften if heated to this point. Remember that just because the exhaust temperature is that hot does not mean your headers or exhaust valves are that hot, but that they will be quickly approaching those temperatures unless the EGTs are reduced. You will also begin damage O2 and WO2 sensors at about 1650F (900C) and therefore should use this value as the upper limit when dealing with a street car with O2 and or WO2 sensors. The melting point of mild steel is about 2730F (1515C) and your headers will be dripping at that point, but you should never see EGTs anywhere near that point. Typical EGT values should be between about 1250 and 1600 at WOT. Most engines will make max power at an AF ratio between 12.0 and 13.5:1 but should be lower sometimes if detonation is a problem or high IATs are expected from a forced induction application. There is no “ideal” EGT. The optimal EGT values will change with engine combinations (cams, pistons, headers, etc). Raising the compression with no other changes will drop the EGT at the same AFR. Many times a decrease in EGT is the result of detonation. It seems counter intuitive, but all the extra heat from the detonation gets absorbed by the combustion chamber so there is less heat transferred to the exhaust."


    Leaded fuel will cool EGT's and reduce detonation ... but is hard on O2 & WO2 sensors.

    What are you trying to accomplish?

    BB

  7. #5
    149 BGJ-Willis Power 540 willis's Avatar
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    Quote Originally Posted by BUSBY View Post
    Willis ... from trick tuners:


    What are you trying to accomplish?

    BB

    Building a new power plant.

    Changing how to manage air/fuel, just looking at the plugs and egt’s are killing me.

    Thanks

    Keith, Buzz and Jordan
    Last edited by willis; 12-27-2011 at 06:30 PM.

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    Willis, for what its worth, My roots blower combo with 2 doms ran rich and my egt's were 1680-1750. This was with turbo blue, 7.8-1 comp, and 29 degrees total with 14 lbs of boost. Plug readings were a little dark but the timing mark was happy on the strap. ran like this for a long time with no problems. i think fuel was burning in the pipes. Far from perfect, but made 1100hp.I was told the biggest enemy to the O2 sensors is moisture. Some dyno operators will warm up the engine prior to inserting the sensors.
    Last edited by DEL51; 12-27-2011 at 06:58 PM.

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    Amber Racing Services BUSBY's Avatar
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    Quote Originally Posted by willis View Post
    Building a new power plant.

    Changing how to manage air/fuel, just looking at the plugs and egt’s are killing me.

    Thanks

    Keith, Buzz and Jordan
    BGJ's w/ PSI's like it fat!

  10. #8
    Pro Gas Jet RedPearl's Avatar
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    Default Fast system

    Ive been running the Fast A/F system for a couple years now. with our experience Willis, Make sure you keep reading the plugs the old fashion way and keep collecting and logging data till you see some good results, dont live and die by the sensors you can get some false readings if your way off with the sensors. but once you get close it can be really handy. good luck buddy, Robb
    Don't be afraid to try something new. Remember, amateurs built the Ark...Professionals built the Titanic!

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    Leaded fuel will definitely cause premature sensor failure.

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    Quote Originally Posted by RedPearl View Post
    Ive been running the Fast A/F system for a couple years now. with our experience Willis, Make sure you keep reading the plugs the old fashion way and keep collecting and logging data till you see some good results, dont live and die by the sensors you can get some false readings if your way off with the sensors. but once you get close it can be really handy. good luck buddy, Robb
    Totally agree with this, loggin data is the best way to find a pattern or hick up. checking plugs is a
    Must

  13. #11
    Highaboosta Unchained's Avatar
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    Leaded fuel will ruin an O2 sensor eventually.
    One would last a whole summer for me on 110 octane race gas back when I ran that high priced fuel.
    That would be 30+ hours with much of that cruising at stoich.
    The farther off the A/F is rich the shorter the life span of the sensor will be.

    The sensor should be in the collector of a header and not right next to the cylinder head so it doesn't see as much heat.
    After the turbo for those applications.
    http://i621.photobucket.com/albums/t...541800x600.jpg

    I've gone 5 years on the same NTK sensor that came with the FAST XFI running E85 fuel and reading closed loop all the time.

    Twin Turbo 1800 HP V-Drive lake boat

    http://s621.photobucket.com/albums/t...t=MAH05771.mp4

    Quote Originally Posted by Trigger View Post
    No one cares about your buddies old antiquated garden hose technology.
    Quote Originally Posted by MAXIMUS View Post
    I think I could run more boost but it's a real hand full right now

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