Who logs while racing? If so do you notice odd wideband readings? If I rag the car out hard my LC-1 starts to read more rich until it will only bounce from 10:1 straight to 20:1. I'm thinking I may be overheating it or something... but I have the LED installed and it is not giving me the "overheated" trouble code. If I drive normal for a while the AFR comes back and everything looks normal. I don't think I'm actually running that rich while racing but I'm not sure what's going on w/ my wideband. Anyone else have similar experience?

Things to consider:
I use water/alc injection.
The car is tuned to run 11.2-11.5ish under high load.
I only run 23-24ish psi.
The WB is located just before the bend in the DP in the vertical portion.
I have heat wrapped the LC-1 control box because I thought it might be getting to hot... not it.

 

I always log on the road course and never experienced what you described.

my guess would be the alky is messing up the readings.

you're probably better off posting this question on the innovative forums though...

 

The innovate forums look like garbage. It doesn't look like anyone gets responses. Do you have an LC-1? If so, where do you have it mounted? Where is your little control box thing?

 

Thats surprising their forums are like that, I've always gotten quick responses when I posted something over there.

I have an LM-1 & an LC-1. On the EVO my sensor is mounted in my test pipe and my LM-1 box is in the glove.

 

Sounds like either the unit is overheating or the actual sensor is on it's way out.

Here is a log (with Wideband AFR in red) of a full lap of Miller Motorsports park, stables AFR throughout:

 

^^ On a 100+ degree day no less. Assuming that's accurate as I've never read these logs before.

 

I have not set my car up enough to start logging, but I have a very similar set up and I have not experienced such things. A friend of mine had something like you mentioned happen to his on a crx, I believe, and he discovered the sensor itself was crapping out. Replaced the sensor and no more problems. His would show mega lean for a long time, even with a 5 gas anaylzer in the tail pipe showing the car to actually be 12:1.

 

i only log trees

 

Thanks Bryan, is that with an LC-1?

I don't think the unit is overheating because like I said, I heatwrapped that and got it away from the hot stuff in the engine bay. It goes haywire when I drive really hard, not necessarily when it's very hot outside.

A little hard to see in this picture below but you can see that the first couple pulls on the screen (they are probably the 10th set of pulls overall) have normal AFR (low 11s). Then you can see on the rightmost run through the gears it bottoms out at 10:1.

I was thinking the sensor is just shot too... but I don't want to just stick another one in there to fail if I should be moving the placement of it for some reason.