More or less... I'm about 99% sure it's due to a leak somewhere before the sensor. I've watched the logs and it is definately not due to the running condition of the engine as the PWs don't change as it spikes. It's also not due to electrical as I've verified my grounds and there is very minimal noise on them. The heater ground has been isolated by 5 feet from the sensor ground.

Once I get a spare turbo to send to Stephanie I'm going to have a new downpipe made for me.... then we will know for sure if that is the problem.

 

make sure the lc-1, MS, and datalog viewer are configured for 0-5 : 10-20.

 

can we get an example of how smooth the lc-1 afr logs should look? Mine is not smooth, but not this spikey.

 

I sent you mine a few days ago. AFR is in there.

 

but yours matches mine. I still hear people say it should be perfectly smooth.

 

I have no clue what people are talking about then. Perfectly smooth as in the AFR doesnt even fluctuate +/- .x afr? Just stays solid the whole time?
Turn off ego correction and it will be even smoother.

 

ya know, considering the 2 people who've told me its fucked up are supercharger owners with pc-pro's, I'm a dumbass for listening.

 

 

Scot is correct I don't think anyone can make a perfectly smooth AF. That is just the nature of the varying degrees of effeciency and injector lag intervals, throwing of the signals not to mention the posibility for electrical interference etc.

 

That's about what my last log looked like. Maybe I don't have a problem after all.

 

looks pretty smooth to me, the lean spikes are from ECU resets and lack of accel enrichments.


another one zooomeded in:

 

I thought that Accel Encrichments read lean because of the additional fuel dumped into the engine?

 

You are joking right Sam?

 

only if you put too much in, too fast, causing a misfire.