http://www.ptuning.com/html/Item-Des...niversal%20Fit

Would this extend the life of the sensor? The thing costs about $90. You can buy 2 extra sensors by the time you install one of these. I plan on running my wideband all the time.

Just looking for some input.

Thanks,
Josh

 

The Bosch LSU4.2 wide-band O2 sensor (shipped as part of the LM-1 kit) is rated to operate at an exhaust gas temperature of < 1300 degrees (F), and a sensor housing temperature of < 900 degrees (measured at the bung) for maximum accuracy and control. When either of these operating temperature ranges is exceeded, the sensor can no longer be accurately controlled. Further, operating at or over these temperatures for any length of time can significantly reduce the lifetime of the sensor.

Doesn't seem that safe to run in your car all the time to me. And you gotta make sure that the wideband works with whatever engine management you're using.

Jeremy

 

That depends on what normal operating temps for the RX7 exhaust are(something I am searching for now)

I would assume adding this bung should help extend the life. I suppose my question is how much will it extend the life?


Edit: OK so after doing some reading on EGTs it looks like the FD runs at well above 500C. and can hit the 1000C range(1830F)

I think that to even think about running it all the time, this extender is a must.

It may still fry, so you may be right jeremy.


Will the TechEdge, or another WB02, withstand our EGTs? I know there are guys out there running their widebands continuously.


Also I run a midpipe, would moving the sensor to the midpipe cause any problems. I would assume the a/f ratio would still be the same but the gases would be cooler(I am just thinking "outloud" and will search to see if the question has been posed on another thread).

It is obvious that the exhausts arent coming out of the tailpipe at 1800F. It would melt your hand. So the further back you can move the sensor the safer it is going to be for the sensor.

 

actually, i just finished reading http://www.scuderiaciriani.com/rx7/AF_meter.html

and they are saying spirited EGTs are somewhere in the 850C range (~1560F) which is quite a bit closer to the maximum operating temp of the sensor.


Does anyone know of a reason NOT to put the sensor in the midpipe?

 

I had tried to run the LM-1 but I was unable to get any AFR readings because the sensor kept over heating. I think they fixed this issue. I ended up the returning the unit and bought a Tech Edge WB02. I have had in permanently installed in my car for over a year. So far so good.

 

Thanks, that is the type of stuff I am looking for.

I guess I will try it out and see what happens. If not I may be moving to the TechEdge.

I am going to try and mount it with this extender/heatsink to see if it helps.

I have already purchased it, so in a way these questions are too late, but I would rather sell it before the install if I made a mistake.

 

A few years back on the Tech Edge support list someone suggested using a "spark plug extender" or something like that available from most auto parts stores. At the time I had never heard of such a thing but the next time I was in Pep Boys I saw one.. it looks almost exactly like that and it seems they had one with the same threads as the O2 sensor. Best part is, it was only $5. $90 seems a little pricey for that thing.

 

yea that is what i was thinking. thanks for the heads up. i am going to rummage some of the autoparts and see what i can find.

 

It seems like that might allow you to run the sensor closer to the engine without overheating. Running the sensor slower to the engine might give a better corellation between the readings and the cell in your fuel map. However, I am not sure how much it would really matter.

That product does have some heat sink fins that should allow it to dissipate heat better than a simple spark plug spacer, but it does seem expensive at $90.

-Max

 

I think my wideband is going on the midpipe. There is no cat to dilute/modify the outcoming exhaust charge. so i think this should still provide accurate a/f ratios.